WO2018023221A1 - 一种信道信息传输装置、方法和系统 - Google Patents

一种信道信息传输装置、方法和系统 Download PDF

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Publication number
WO2018023221A1
WO2018023221A1 PCT/CN2016/092522 CN2016092522W WO2018023221A1 WO 2018023221 A1 WO2018023221 A1 WO 2018023221A1 CN 2016092522 W CN2016092522 W CN 2016092522W WO 2018023221 A1 WO2018023221 A1 WO 2018023221A1
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Prior art keywords
channel information
information
channel
quantized
accuracy
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Ceased
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PCT/CN2016/092522
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English (en)
French (fr)
Inventor
张荻
刘鹍鹏
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Priority to CN201680087890.1A priority Critical patent/CN109478948B/zh
Priority to EP16910819.8A priority patent/EP3480982B1/en
Priority to PCT/CN2016/092522 priority patent/WO2018023221A1/zh
Priority to BR112019001776-3A priority patent/BR112019001776A2/pt
Priority to JP2019504095A priority patent/JP6729851B2/ja
Priority to KR1020197005020A priority patent/KR102175559B1/ko
Publication of WO2018023221A1 publication Critical patent/WO2018023221A1/zh
Priority to US16/261,000 priority patent/US10819485B2/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • HELECTRICITY
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    • H04L1/0023Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0026Transmission of channel quality indication
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Definitions

  • the present application relates to the field of wireless communications technologies, and in particular, to a channel information transmission apparatus, method, and system.
  • a user equipment performs channel estimation according to a reference signal sent by a base station, and then determines channel status information. And feedback, the channel state information includes a Rank Indicator (RI), a Precoding Matrix Indicator (PMI), and a Channel Quality Indicator (CQI).
  • RI Rank Indicator
  • PMI Precoding Matrix Indicator
  • CQI Channel Quality Indicator
  • the PMI is an index to the precoding matrix.
  • the UE feeds back the PMI to the base station.
  • the base station determines a corresponding precoding matrix according to the received PMI, and performs precoding processing according to the determined precoding matrix to improve downlink communication quality.
  • the accuracy of the UE's feedback to the PMI determines the adaptive performance of the base station to the downlink of the UE.
  • a channel information transmission apparatus, method and system are provided to improve the feedback precision of channel information related to a precoding matrix, thereby improving the adaptive performance of the downlink.
  • the first aspect provides a channel information transmission method, in which a second device sends a reference signal, and the first device performs channel estimation according to the received reference signal, generates a precoding matrix, and generates a Precoding the first channel information and the second channel information of the matrix, and transmitting the generated first channel information and second channel information to the second device.
  • the second device generates a precoding matrix according to the received first channel information and the second channel information, and according to the generated precoding matrix
  • the first device sends data.
  • the accuracy of the first channel information is higher than the accuracy of the second channel information; the first channel information includes phase information of each element of the precoding matrix, and the second channel information includes the precoding The amplitude information of each element of the matrix.
  • the phase information in the channel information is more critical to the restored channel matrix, and the accuracy requirement is high, and the amplitude information is not critical information for restoring the channel matrix, and the precision can be low, so the phase information of the precoding matrix is higher than the amplitude information.
  • the aspect can reduce the overhead of channel information feedback, and on the other hand, can ensure the accuracy of channel information feedback.
  • the first device after generating the precoding matrix, the first device generates only the first channel information for indicating the precoding matrix, does not generate the second channel information, and sends the first information when transmitting the channel information to the second device.
  • Channel information optionally, the first channel information is unquantized channel information or quantized channel information.
  • the first channel information is separately generated for each of the preset subbands in the system band.
  • the second device After receiving the first channel information, the second device generates a precoding matrix according to the first channel information, and sends the data to the first device according to the generated precoding matrix.
  • the second device may generate the precoding matrix according to the preset amplitude value as the amplitude value of each element of the precoding matrix, or may determine the amplitude according to the value of the rank, the number of transmitting antenna ports, and the like.
  • the value is used to generate the precoding matrix by using the determined amplitude value as the amplitude value of each element of the precoding matrix. Because the first channel information is provided, the first channel information can be fed back with higher precision, so that the second device obtains a more accurate precoding matrix according to the first channel information, and performs data transmission according to a more accurate precoding matrix. Get better link adaptation and improve system performance.
  • the first channel information is unquantized channel information
  • the second channel information is quantized channel information
  • the first channel information and the second channel information are both quantized channel information, and the quantized bits of the first channel information are greater than the quantized bits of the second channel information;
  • the first device separately generates the first channel information for each preset sub-band in the system frequency band, and generates the second channel information for the entire system bandwidth;
  • the transmission period of the first channel information is smaller than the transmission period of the second channel information.
  • the first channel information includes: K groups of first channel sub-information; the K is a positive integer, which is a number of column vectors included in the precoding matrix; each column The vector corresponds to a set of first channel sub-information;
  • the first channel sub-information includes:
  • the first channel basic sub-information is the phase information of the reference element in the column vector corresponding to the first channel sub-information, and the phase of the reference element is not zero;
  • L-2 first channel relative sub-information where L is the length of the column vector, and one of the first channel relative sub-informations corresponds to a phase non-zero in the column vector other than the reference element An element for indicating a deviation of a phase of the corresponding element from a phase of the reference element;
  • the first channel basic sub-information is unquantized channel information
  • the first channel relative sub-information is quantized channel information
  • the second channel information may be the quantized channel information, and the quantized bits of each of the first channel relative sub-information are greater than the quantized bits of the second channel information.
  • the second channel information may be the quantized channel information, and the quantized bits of each of the first channel relative sub-information are greater than the quantized bits of the second channel information.
  • a first device having the functionality to implement the behavior of the first device in the method of the first aspect.
  • the functions may be implemented by hardware or by corresponding software implemented by hardware.
  • the hardware or software includes one or more modules corresponding to the functions described above.
  • the structure of the first device includes a processor, a receiver, and a transmitter configured to support the first device to perform a corresponding function of the method of the above first aspect.
  • the receiver is configured to receive a reference signal by the first device, and further, to receive data by the first device.
  • the transmitter is configured to send channel information by the first device, and further, to the first device to send data.
  • the first device can also include a memory for coupling with a processor that retains program instructions and data necessary for the first device.
  • a second device having the function of implementing the behavior of the second device in the method of the first aspect.
  • the functions may be implemented by hardware or by corresponding software implemented by hardware.
  • the hardware or software includes one or more modules corresponding to the functions described above.
  • the second device includes a processor, a receiver, and a transmitter, and the processor is configured to support the second device to perform a corresponding function in the method of the foregoing first aspect.
  • the transmitter is configured to send a reference signal by the second device, and further, can also be used to send data by the second device.
  • the receiver is configured to receive channel information by the second device, and further, to receive data by the second device.
  • the second device can also include a memory for coupling with the processor that retains the program instructions and data necessary for the second device.
  • a wireless communication system comprising the first device and the second device described in the first aspect above.
  • a computer storage medium for storing computer software instructions for use in a first device of the first aspect described above, comprising a program for performing the above aspects.
  • a computer storage medium for storing computer software instructions for use in a second device of the first aspect described above, comprising a program for performing the above aspects.
  • a channel information transmission method is provided.
  • a second device sends a reference signal
  • the first device performs channel estimation according to the received reference signal to generate a precoding matrix W.
  • W is a matrix of N t rows and R columns
  • X is a matrix of N t /2 rows and M columns
  • X [b 0 , b 1 , ..., b M-1 ]
  • b i is a column vector of dimension N t /2, 0 ⁇ i ⁇ M-1
  • N t is the number of antenna ports of the second device that sends the reference signal
  • W 2 is a matrix of 2M rows and R columns, among them, Is a unit vector of dimension M, only the first element of the k m is 1, the value of the other elements are 0, and 0 ⁇ m ⁇ R-1, ⁇ n is the modulus of a complex number, 0 ⁇ n ⁇ R -1;
  • M, R, N t are all positive integers, and N t
  • the first device generates third channel information, fourth channel information, and fifth channel information: the third channel information is used to indicate X; and the fourth channel information is used to indicate The fifth channel information is used to indicate ⁇ 0 , . . . , ⁇ n , . . . , ⁇ R-1 .
  • the accuracy of the third channel information is lower than the accuracy of the fifth channel information.
  • the first device sends the third channel information, the fourth channel information, and the fifth channel information to the second device.
  • the second device generates a precoding matrix according to the received third channel information, the fourth channel information, and the fifth channel information, and sends the data to the first device according to the generated precoding matrix.
  • the fifth channel information in the channel information is relatively critical to the restored channel matrix, and the accuracy requirement is high, and the third information information is not the key information required to restore the channel matrix, and the accuracy may be lower, so the fifth channel information is smaller than the third channel.
  • the feedback accuracy of the information is high, on the one hand, the overhead of channel information feedback can be reduced, and on the other hand, the accuracy of channel information feedback can be ensured.
  • the first device generates the third channel information for the entire system bandwidth, and separately generates the fourth channel information and the fifth channel information for each preset subband in the system frequency band;
  • the feedback precision of the fifth channel information is high through the transmission period of the control channel information
  • the transmission period of the third channel information is larger than the transmission period of the fourth channel information, and the transmission period of the third channel information is larger than the transmission period of the fifth channel information.
  • any of the following methods may be employed:
  • the third channel information is quantized channel information, and the fifth channel information is unquantized channel information; or
  • the third channel information and the fifth channel information are both quantized channel information, and the quantized bits of each vector indicated by the third channel information are smaller than the quantized bits of the fifth channel information. Less; or
  • the third channel information and the fifth channel information are both quantized channel information, and the quantized bits of each vector indicated by the third channel information are all indicated by the fifth channel information. Any one of ⁇ n has fewer quantized bits; or
  • the third channel information and the fifth channel information are both quantized channel information, and the quantized bits of each element of any one of the vectors indicated by the third channel information are compared to the fifth channel. Any one of the ⁇ n indicated by the information has a small number of quantization bits.
  • a first device having the function of implementing the behavior of the first device in the method of the seventh aspect.
  • the functions may be implemented by hardware or by corresponding software implemented by hardware.
  • the hardware or software includes one or more modules corresponding to the functions described above.
  • the first device includes a processor, a receiver, and a transmitter, and the processor is configured to support the first device to perform a corresponding function in the method of the foregoing first aspect.
  • the receiver is configured to receive a reference signal by the first device, and further, to receive data by the first device.
  • the transmitter is configured to send channel information by the first device, and further, to the first device to send data.
  • the first device can also include a memory for coupling with a processor that retains program instructions and data necessary for the first device.
  • a second device having the function of implementing the behavior of the second device in the method of the seventh aspect.
  • the function can be implemented by hardware or by hardware.
  • the software implementation should be.
  • the hardware or software includes one or more modules corresponding to the functions described above.
  • the second device includes a processor, a receiver, and a transmitter, and the processor is configured to support the second device to perform a corresponding function in the method of the foregoing first aspect.
  • the transmitter is configured to send a reference signal by the second device, and further, can also be used to send data by the second device.
  • the receiver is configured to receive channel information by the second device, and further, to receive data by the second device.
  • the second device can also include a memory for coupling with the processor that retains the program instructions and data necessary for the second device.
  • a wireless communication system comprising the first device and the second device described in the seventh aspect above.
  • a computer storage medium for storing computer software instructions for use in the first device of the seventh aspect above, comprising a program for performing the above aspects.
  • a computer storage medium for storing computer software instructions for use in the second device of the seventh aspect described above, comprising a program for performing the above aspects.
  • FIG. 1 is a schematic structural diagram of a wireless communication system according to an embodiment of the present application.
  • FIG. 3 is a flowchart of a first method for reporting channel information according to an embodiment of the present application
  • FIG. 4 is a schematic diagram of a first device generating first channel information for each subband of an entire system band in an embodiment of the present application
  • FIG. 5 is a schematic diagram of generating, by the first device, second channel information for the entire system band in the embodiment of the present application;
  • FIG. 6 is a flowchart of a second reporting channel information solution according to an embodiment of the present application.
  • FIG. 7 is a schematic diagram of generating, by a first device, third channel information for an entire system band in an embodiment of the present application
  • FIG. 8 is a schematic diagram of a first device transmitting a third channel information to a ZC sequence according to an embodiment of the present application
  • FIG. 9 is a schematic diagram of generating, by a first device, fourth channel information for each subband of an entire system band in an embodiment of the present application.
  • FIG. 10 is a schematic diagram of generating, by a first device, fifth channel information for each subband of an entire system band in an embodiment of the present application;
  • FIG. 11 is a schematic structural diagram of a first first device according to an embodiment of the present application.
  • FIG. 12 is a schematic structural diagram of a second first device according to an embodiment of the present disclosure.
  • FIG. 13 is a schematic structural diagram of a first type of second device according to an embodiment of the present application.
  • FIG. 14 is a schematic structural diagram of a second second device according to an embodiment of the present application.
  • the transmission signal is x
  • the received signal is y
  • the channel impulse response of the channel between x and y is h
  • the additive Gaussian noise is n
  • MIMO Multiple Input Multiple Output
  • H is the channel matrix, H ⁇ f Nr ⁇ Nt , n ⁇ f Nr ⁇ 1
  • the i-th row and the j-th column of the channel matrix H represent the complex channel gain from the jth transmitting antenna to the ith receiving antenna.
  • SIMO Single Input Multiple Output
  • MISO Multiple Input Single Output
  • the transmitting end of the signal obtains the channel information of the channel between the transmitting end and the receiving end, and then pre-processes the transmitting signal according to the obtained channel information, and can partially or completely eliminate the interference between the data streams in the transmitting end to implement the data.
  • the transmitted link is adaptive, that is, different data transmission methods are adopted according to different channel conditions, and interference between data streams is minimized.
  • the matrix used by the transmitting end for precoding processing is the "precoding matrix”.
  • F is a precoding matrix
  • the UE feeds back the index PMI of the selected precoding matrix to the base station.
  • the codebook with the number of antenna ports is 2 as shown in the following table.
  • the precoding matrix fed back by the UE is quantized, so there is an error, and the channel information obtained by the base station is inaccurate, and the link adaptation performance is poor.
  • the base station sends a measurement reference signal to the UE, and the UE performs channel estimation according to the received measurement reference signal, thereby obtaining a channel matrix H, and the UE directly feeds back channel information for describing H to the base station.
  • the amount of information that needs to be fed back is large, and the overhead is large, resulting in a decrease in data transmission efficiency and a decrease in system performance.
  • the information with high accuracy and high precision required for the restored channel matrix is used, and the feedback precision is high, for example, no quantization or quantization but more quantization bits, for example.
  • Use a shorter period for feedback for example: feedback for each of the preset sub-bands in the system bandwidth instead of the entire system bandwidth.
  • the first channel information in the first scheme below that is, the phase information of each element of the unquantized precoding matrix; and, for example, the fourth channel information (such as column selection information) and the fifth in the second scheme below Channel information (eg, joint-phase (co-phasing) information).
  • the fourth channel information such as column selection information
  • Channel information eg, joint-phase (co-phasing) information
  • feedback is performed with lower feedback accuracy.
  • the number of quantized bits is small when quantizing; for example, feedback is performed with a longer feedback period, for example, for the entire system bandwidth feedback.
  • the second channel information in the first scheme that is, the amplitude information of each element of the precoding matrix
  • the third channel information in the second scheme below. For this information, use lower The accuracy is fed back.
  • FIG. 1 is a schematic structural diagram of a wireless communication system according to an embodiment of the present application. As shown in FIG. 1, the wireless communication system includes a first device 101 and a second device 102.
  • the second device 102 sends a reference signal to the first device 101, and the first device 101 performs channel estimation according to the reference signal received from the second device 102, and transmits channel information for indicating the channel estimation result to the second device 102.
  • the second device 102 performs data transmission to the first device 101 according to the received channel information.
  • the above interaction process of the first device 101 and the second device 102 can be as shown in FIG. 2.
  • the first device 101 may be a network device, such as a base station, and the second device 102 may be a terminal device; or the first device 101 may be a terminal device, and the second device 102 may be a network device; or the first device 101 and The second device 102 is a terminal device; or the first device 101 and the second device 102 are both network devices.
  • a network device such as a base station
  • the second device 102 may be a terminal device
  • the first device 101 may be a terminal device
  • the second device 102 may be a network device
  • the first device 101 and The second device 102 is a terminal device
  • the first device 101 and the second device 102 are both network devices.
  • the first device 101 performs channel estimation and feeds back channel information according to the reference signal, and can use the solution provided by the embodiment of the present application to perform channel information reporting and data transmission to obtain More accurate channel estimation results improve link adaptation performance.
  • duplex mode is used for communication between the first device 101 and the second device 102, such as the FDD duplex mode described above, or the duplex mode of Time Division Duplexing (TDD).
  • the scheme provided by the embodiment of the present application is used to obtain accurate channel estimation results and improve link adaptation performance.
  • the communication system for communication between the first device 101 and the second device 102 may include, but is not limited to, Global System of Mobile communication (GSM), Code Division Multiple Access (CDMA) IS. -95, Code Division Multiple Access (CDMA) 2000, Time Division Synchronous Code Division Multiple Access (Time Division-Synchronous Code Division Multiple Access (TD-SCDMA), Wideband Code Division Multiple Access (WCDMA), Time Division Duplexing-Long Term Evolution (TDD LTE), Frequency Division Dual -Frequency Division Duplexing-Long Term Evolution (FDD LTE), Long Term Evolution-Advanced (LTE-advanced), Personal Handy-phone System (PHS), 802.11 Series Protocol Provisioned Wireless Fidelity (WiFi), Worldwide Interoperability for Microwave Access (WiMAX), and various wireless communication systems in the future.
  • GSM Global System of Mobile communication
  • CDMA Code Division Multiple Access
  • CDMA Code Division Multiple Access
  • TD-SCDMA Time Division Synchronous Code Division Multiple Access
  • the foregoing terminal device may be a wireless terminal, and the wireless terminal may be a device that provides voice and/or data connectivity to the user, a handheld device with a wireless connection function, or other processing device connected to the wireless modem.
  • the wireless terminal can communicate with one or more core networks via a radio access network (eg, RAN, Radio Access Network), which can be a mobile terminal, such as a mobile phone (or "cellular" phone) and with a mobile terminal
  • RAN Radio Access Network
  • the computers for example, can be portable, pocket-sized, handheld, computer-integrated or in-vehicle mobile devices that exchange language and/or data with the wireless access network.
  • a wireless terminal may also be called a Subscriber Unit, a Subscriber Station, a Mobile Station, a Mobile, a Remote Station, an Access Point, and a Remote Terminal.
  • Remote Terminal Access Terminal, User Terminal, User Agent, User Device, or User Equipment.
  • the foregoing network device may include a base station, or a radio resource management device for controlling the base station, or a base station and a radio resource management device for controlling the base station; wherein the base station may be a macro station or a small station, such as a small cell (small cell)
  • the base station may also be a home base station, such as a Home NodeB (HNB), a Home eNodeB (HeNB), etc., and the base station may also include a relay node (relay) )Wait.
  • HNB Home NodeB
  • HeNB Home eNodeB
  • the foregoing network device may be an evolved Node B (eNodeB), and the terminal device may be a UE; for a TD-SCDMA system or a WCDMA system, the foregoing network
  • the device may include: a Node B (NodeB) and/or a Radio Network Controller (RNC), and the terminal device may be a UE; for the GSM system, the foregoing network device may include a Base Transceiver Station (BTS) And/or a base station controller (BSC), the terminal device may be a mobile station (MS); for the WiFi system, the foregoing network device may include: an access point (AP) and/or Access Controller (AC), the terminal device can be a station (STAtion, STA).
  • BTS Base Transceiver Station
  • BSC Base Station Controller
  • MS mobile station
  • the foregoing network device may include: an access point (AP) and/or Access Controller (AC), the terminal device can be a station (STAtion, STA).
  • AP
  • FIGS 3 and 6 below show two schemes for reporting channel information, respectively.
  • FIG. 3 shows a flow of a first channel information reporting scheme provided by an embodiment of the present application. As shown in FIG. 3, the process includes the following steps:
  • the second device 102 sends a reference signal to the first device 101, where the reference signal is used for channel estimation of the channel of the second device 102 to the first device 101.
  • the reference signal may be a DeModulation Reference Signal (DMRS) signal.
  • DMRS DeModulation Reference Signal
  • the first device 101 performs channel estimation according to the reference signal to obtain a channel matrix H;
  • the first device 101 obtains a precoding matrix according to the channel matrix H.
  • the first device 101 may adopt a Singular Value Decomposition (SVD) or other manner when obtaining a precoding matrix according to the channel matrix H.
  • SVD Singular Value Decomposition
  • the first device 101 generates first channel information and second channel information for describing a precoding matrix (referred to as "matrix W").
  • the first channel information includes phase information of each element of the matrix W;
  • the second channel information includes amplitude information of each element of the matrix W.
  • the first device 101 sends the generated first channel information and second channel information to the second.
  • Device 102 The first device 101 sends the generated first channel information and second channel information to the second.
  • the first device 101 may send the first channel information and the second channel information to the second device 102, and may also send the two channel information to the second device 102.
  • first channel information and the second channel information are quantized, they are sent to the second device 102 after being processed by encoding, modulation, etc.; if the first channel information and the second channel information are not quantized, the first channel information may be directly
  • the one channel information and the second channel information are carried on the ZC sequence and sent to the second device 102. Since the autocorrelation property and the cross-correlation property of the ZC sequence are good, the second device 102 can obtain better signal demodulation performance when acquiring channel information from the ZC sequence, and improve the accuracy of channel information acquisition.
  • the ZC sequence is only an example, and the first channel information and the second channel information may also be transmitted on other sequences or transmitted in other manners, as long as the second device 102 can acquire channel information.
  • the mode carried on the sequence such as the ZC sequence actually uses the physical layer transmission mode.
  • the channel information may also use Medium Access Control (MAC) signaling or high layer signaling, such as (Radio). Resource Control, RRC) signaling, etc.
  • MAC Medium Access Control
  • RRC Resource Control
  • the second device 102 generates a precoding matrix according to the received first channel information and the second channel information, and determines, according to the generated precoding matrix, a sending manner used when transmitting data to the first device 101.
  • the method for determining the data transmission mode by the device 102 according to the generated precoding matrix may refer to a method for the current base station to determine a data transmission manner according to the quantized precoding matrix.
  • the second device 102 performs data transmission to the first device 101 by using a determined transmission manner.
  • step S304 when generating the first channel information, the first device 101 may generate first channel information for each preset sub-band in the system frequency band.
  • the first channel information is unquantized channel information
  • the second channel information is quantized channel information
  • the first channel information and the second channel information are both quantized channel information, and the quantized bits of the first channel information are greater than the quantized bits of the second channel information;
  • the first channel information is separately generated for each of the preset sub-bands in the system band, and the second channel information is generated for the entire system bandwidth;
  • the transmission period of the first channel information is smaller than the transmission period of the second channel information.
  • the following is a detailed description of the feedback of the first channel information and the second channel information, respectively.
  • Method 1 The first channel information is not quantized, and the analog quantity is directly fed back.
  • the second method uses a high-precision quantization method for the first channel information.
  • the accuracy of the first channel information obtained by the second device 102 can be ensured, thereby obtaining a more accurate precoding matrix, and performing data transmission according to a more accurate precoding matrix. Better link adaptation and improved system performance.
  • the quantized bits quantized by the first channel information are not less than the quantized bits quantized by the second channel information.
  • the first channel information and the second channel information are treated differently, and the key information of the restored channel matrix is quantized with high precision, and the low-precision quantization is used for the less critical amplitude information, which can ensure the accuracy of certain channel information feedback. , can effectively reduce the amount of information feedback, reduce system overhead, and improve data transmission efficiency.
  • Method 3 Sending the first channel information packet, part of the information in each group is not quantized, and part of the information is highly accurately quantized.
  • the first channel information is divided into K groups of first channel sub-information; K is a positive integer, which is the number of column vectors included in the matrix W; each column vector corresponds to a set of first channel sub-information.
  • the first channel sub-information further includes:
  • the first channel basic sub-information is a reference element in a column vector corresponding to the first channel sub-information Phase information, the phase of the reference element is not zero, and the basic information of the first channel is not quantized;
  • L-2 first channel relative sub-information where L is the length of the column vector, that is, the number of antenna ports transmitted by the second device 102.
  • a first channel relative sub-information corresponds to a phase non-zero element other than the reference element in the column vector, used to indicate a deviation of the phase of the corresponding element from the reference element phase, and the first channel relative sub-information is quantized Channel information.
  • the quantized bits quantized by the first channel relative sub-information are not less than the quantized bits quantized by the second channel information.
  • the first channel information and the second channel information are treated differently, and the phase information critical to the restored channel matrix is quantized with high precision, and the low-precision quantization is used for the less critical amplitude information, thereby ensuring certain channel information.
  • the accuracy of feedback can effectively reduce the amount of information feedback, reduce system overhead, and improve data transmission efficiency.
  • L is the number of transmit antenna ports of the second device 102.
  • the reference element is the first element (Of course, the reference element can also be other elements in the column vector as long as the phase is not zero).
  • the first channel basic sub-information is used to describe The first device 101 can use an analog quantity when feedback Give feedback.
  • d 1 , d 2 , . . . , d L-2 are the information described by the foregoing L-2 first channel relative sub-information, and for these correlation coefficients, feedback can be performed after quantization.
  • the first device 101 generates corresponding first channel information for each of the 10 sub-bands.
  • the first device 101 can measure the precoding matrix every P RBs, and P is a positive integer. For example, for a 10 MHz system band (50 Resource Blocks (RBs)), the first device 101 measures the precoding matrix by using a group of 10 RBs, and feedbacks the phase information of the precoding matrix, that is, subband feedback. .
  • RBs Resource Blocks
  • the second device 102 can obtain the first channel information of each sub-band, and the feedback precision is higher than the broadband feedback (that is, one channel information is fed back for the entire system band), which can also effectively improve the system performance.
  • the width of the sub-band may be a preset value, or may be determined by the first device 101 according to the specific situation, or the second device 102 may notify the first device 101 by using a message.
  • the first device 101 performs channel estimation according to the received reference signal, and when determining that the channel quality is good, the width of the sub-band can be set to a larger value; when the channel quality is poor, the sub-band can be The width is set to a small value, and the first channel information with higher precision is fed back as much as possible.
  • the first device 101 can set the width of the sub-band according to the amount of data to be sent.
  • the width of the sub-band can be set to a small value, and the first channel information is used.
  • the overhead is large, but the amount of data to be sent is small, which has little effect on system performance. If the amount of data to be sent is large, the width of the sub-band can be set to a larger value to reduce the first channel information. The overhead is guaranteed to send data.
  • the first device 101 may feed back the first channel information in a short period and feed back the second channel information in a longer period.
  • the second device 102 is able to obtain denser first channel information, thereby generating a more accurate precoding matrix.
  • the LTE system is used as an example.
  • the period in which the UE sends the first channel information to the base station may not be greater than the feedback period of the PMI in the current LTE system.
  • the PMI feedback period is 5 milliseconds (ms).
  • the period in which the first device 101 feeds back the first channel information may be 2 ms.
  • the first device 101 may generate first channel information for each sub-band, perform feedback using a non-quantized analog mode, or a high-precision quantized digital manner, and Feedback cycle feedback. This allows the second device 102 to obtain more accurate relatively important phase information.
  • Different precision quantization methods can be used for the second channel information, especially low-precision quantization methods.
  • the amplitude of an element of the matrix W is 0.1855, the value after quantization by 2 bits is 0.25, and the value after quantization by 4 bits is 0.1875.
  • the quantization precision of 4 bit quantization is higher than that of 2 bits.
  • the first device 101 may generate second channel information for the entire system band, that is, perform wideband feedback, measure the amplitude information of the matrix W over the full bandwidth, and give feedback.
  • the first device 101 can feed back the second channel information for a longer period. In this way, the amount of information of the second channel information in a unit time can be effectively controlled, and the overhead of the second channel information can be reduced.
  • the LTE system is still used as an example. If the first device 101 is a UE and the second device 102 is a base station, the period in which the UE sends the second channel information to the base station may be not less than the feedback period of the PMI in the current LTE system.
  • the PMI feedback period is 5 milliseconds (ms).
  • the period in which the first device 101 feeds back the second channel information may be 5 ms, 10 ms, or the like.
  • the first device 101 may generate second channel information for the entire system frequency band, perform feedback using a low-precision quantized digital manner, and feed back with a long feedback period. This can minimize the overhead of the second channel information and improve system performance.
  • the first device 101 does not transmit the second channel information, and only transmits the first channel information to the second device 102. That is, in the above step S304, the first device 101 does not generate the second channel information, and in step S305, the first device 101 does not transmit the second channel information.
  • the second device 102 may generate the precoding matrix according to the preset amplitude value as the amplitude value of each element of the precoding matrix, or the second device 102 may also Information such as the value of the rank, the number of transmitting antenna ports, and the like determine the amplitude value, and the determined amplitude value is used as the amplitude value of each element of the precoding matrix to generate a precoding matrix. Since the first channel information is provided, and the feedback accuracy of the first channel information is high, the accuracy of the first channel information obtained by the second device 102 can be ensured, thereby obtaining a more accurate precoding matrix, according to more accurate precoding. The matrix performs data transmission to obtain better link adaptation effects and improve system performance.
  • the channel information obtained by the second device 102 is more accurate, and the restored precoding matrix is more accurate, and a better link can be obtained. Adaptive effect.
  • the manner in which the precoding matrix is obtained from the channel matrix H in the flow shown in FIG. 3 will be exemplified.
  • SVD decomposition of the channel matrix H is performed to obtain a precoding matrix.
  • the decomposition method that can be employed is not limited to the SVD decomposition method as long as the precoding matrix can be obtained from the channel matrix H.
  • the above matrix H may also be a covariance matrix of a channel matrix, as long as it is a matrix capable of characterizing channel characteristics.
  • the first device 101 may perform eigenvalue decomposition on the channel matrix H according to the following formula 3 to obtain a feature vector of the channel matrix H:
  • V is a matrix composed of eigenvectors of the channel matrix H, according to The rank (Rank) of the channel matrix H and the SNR can be obtained, and the precoding matrix W of the channel can be obtained by V, and the number of columns of the matrix W can be equal to the rank of the channel matrix H.
  • FIG. 6 shows a flow of a second channel information reporting scheme provided by an embodiment of the present application. As shown in FIG. 6, the process includes the following steps:
  • the second device 102 sends a reference signal to the first device 101, where the reference signal is used for channel estimation of the channel of the second device 102 to the first device 101.
  • Step S601 can refer to step S301.
  • the first device 101 performs channel estimation according to the reference signal to obtain a precoding matrix, which is denoted by W herein.
  • step S302 and step S303 that is, the second device 102 performs the reference information according to the reference information.
  • the channel estimation obtains the channel matrix H, and then decomposes the channel matrix H to obtain a precoding matrix.
  • the first device 101 may also adopt a method in the current LTE system, and when performing channel estimation according to the reference signal, obtain a precoding matrix.
  • the precoding matrix W is a matrix of N t rows and R columns
  • X is a matrix of N t /2 rows and M columns
  • X [b 0 , b 1 , ..., b M-1 ]
  • b i is a column vector of dimension N t /2, 0 ⁇ i ⁇ M-1
  • N t is the number of antenna ports of the second device that sends the reference signal
  • W 2 is a matrix of 2M rows and R columns, among them, Is a unit vector of dimension M, only the first element of the k m is 1, the value of the other elements are 0, and 0 ⁇ m ⁇ R-1, ⁇ n is the modulus of a complex number, 0 ⁇ n ⁇ R -1
  • M, R, N t are all positive integers
  • N t is an even number.
  • b i can be a feature vector of the channel matrix or a DFT vector.
  • the first device 101 generates third channel information, fourth channel information, and fifth channel information for describing the precoding matrix W, where:
  • the third channel information is used to indicate X;
  • Fourth channel information is used to indicate
  • the fifth channel information is used to indicate ⁇ 0 , . . . , ⁇ n , . . . , ⁇ R-1 .
  • the accuracy of the third channel information is lower than the accuracy of the fifth channel information.
  • the first device 101 sends the generated third channel information, the fourth channel information, and the fifth channel information to the second device 102.
  • the first device 101 directly carries one or more of the third channel information, the fourth channel information, and the fifth channel information to the ZC sequence and sends the information to the second device 102 without undergoing a process of encoding and modulation.
  • the first device 101 may directly carry the third channel information, the fourth channel information, and the unquantized information information in the fifth channel information to the ZC sequence and send the information to the second device. 102. Since the autocorrelation property and the cross-correlation property of the ZC sequence are good, the second device 102 can obtain better signal demodulation performance when acquiring channel information from the ZC sequence, and improve the accuracy of channel information acquisition.
  • the ZC sequence is only an example, and the third channel information, the fourth channel information, and the fifth channel information may also be transmitted on other sequences as long as the second device 102 can acquire the channel information.
  • the mode carried on the sequence such as the ZC sequence actually uses the physical layer transmission mode.
  • the channel information may also use Medium Access Control (MAC) signaling or high layer signaling, such as (Radio). Resource Control, RRC) signaling, etc.
  • MAC Medium Access Control
  • RRC Resource Control
  • the second device 102 generates a precoding matrix according to the received third channel information, the fourth channel information, and the fifth channel information, and determines, according to the generated precoding matrix, a sending manner used when transmitting data to the first device 101.
  • the method for determining the data transmission mode by the second device 102 according to the generated precoding matrix may refer to the method for the current base station to determine the data transmission mode according to the quantized precoding matrix.
  • the second device 102 performs data transmission to the first device 101 by using the determined sending manner.
  • the third channel information, the fourth channel information, and the fifth channel information are used by the second device 102 to determine a precoding matrix, where the precoding matrix is obtained by the first device 101 according to the reference signal sent by the second device 102.
  • the column vector in X may be a Discrete Fourier Transform (DFT) vector, or an unquantized or quantized column vector obtained by channel matrix decomposition.
  • DFT Discrete Fourier Transform
  • the precoding matrix W consists of two codebooks, W1 and W2, namely:
  • b 0 , b 1 , . . . , b M-1 is an example of the M vectors included in the foregoing X.
  • they are column vectors obtained by SVD decomposition of the channel matrix H, which are obtained through long-term statistics. And not quantified.
  • the vector b i is a column vector of the number of ports of the transmitting antenna of the second device 102 (eg, a base station).
  • the value of M may be a preset value or a value pre-configured by the second device 102.
  • the period in which the first device 101 feeds back the channel information is 20 ms
  • the period of the channel measurement is 5 ms
  • the channel matrix H is a matrix of 4 ⁇ 4
  • 16 column vectors are counted in 20 ms.
  • W 1 represents a set of M column vectors
  • W 2 represents a specific direction in which the beam is located
  • W 2 includes column selection information.
  • Co-phasing information ⁇ n the phase difference between the two polarization directions of the transmitting antenna of the second device 102, the value range is any number from 0 to 2 ⁇ , and the first device 101 may not send the second device 102 when transmitting
  • the information is quantified and fed back in an analog manner.
  • the Co-phasing information is an example of the fifth channel information.
  • the rank of the channel matrix takes other values, it can be analogized according to Equation 5 and Equation 6. If the rank is equal to m (m is a positive integer), there are m column vectors in W 2 .
  • the first device 101 may obtain the third channel information for the entire system band when the third channel information is generated.
  • the entire system band is divided into 10 sub-bands: sub-band 1 to sub-band 10, and the first device 101 generates third channel information for the entire system band.
  • the first device 101 may generate fourth channel information for each subband in the entire system band when generating the fourth channel information.
  • the first device 101 may generate fifth channel information for each subband in the entire system band when generating the fifth channel information.
  • the third channel information, the fourth channel information, and the fifth channel information may all be fed back periodically, and the feedback period of the fifth channel information is smaller than the feedback period of the third channel information.
  • the accuracy of the fifth channel information is higher than the accuracy of the third channel information.
  • the accuracy of the fifth channel information can be higher than that of the third channel information by various methods such as comprehensive quantization, feedback period, sub-band feedback or overall system bandwidth feedback. In this way, the feedback accuracy of the channel information can be ensured, and the feedback amount of the channel information can be effectively reduced.
  • Method 1 The third channel information is not quantized, and the analog quantity is directly fed back.
  • the quantized bits for quantizing the third channel information are smaller than the quantized bits for the fifth channel information.
  • the first device 101 may generate third channel information for the entire system band.
  • the first device 101 may transmit the third channel information in a longer period and transmit the fifth channel information in a shorter period.
  • the information amount of the third channel information can be effectively reduced.
  • the LTE system is still used as an example. If the first device 101 is a UE and the second device 102 is a base station, the period in which the UE sends the third channel information to the base station may be not less than the feedback week of the PMI in the current LTE system. period. For example, in the current FDD LTE system, the PMI feedback period is 5 ms. In the embodiment of the present application, the period in which the first device 101 feeds back the third channel information may be 5 ms, 10 ms, or the like.
  • a first device 101 may be valid in the W 1 modulated information a i to the second device 102 to the ZC sequence.
  • the signal corresponding to the diagonal line portion is a reference signal.
  • IFFT represents an Inverse Fast Fourier Transform.
  • the first device 101 may generate third channel information for the entire system frequency band, perform feedback using a low-precision quantized digital manner, and feed back with a longer feedback period. This can effectively reduce the amount of information of the third channel information.
  • the fourth channel information is digitally fed back.
  • the first device 101 may generate fourth channel information for each subband in the system band. For details, refer to FIG. 9.
  • the first device 101 can transmit the fourth channel information in a short period.
  • the second device 102 can obtain denser fourth channel information, thereby generating a more accurate precoding matrix.
  • the LTE system is still taken as an example. If the first device 101 is a UE and the first device 101 is a base station, the period in which the UE sends the fourth channel information to the base station may not be greater than the feedback period of the PMI in the current LTE system. For example, in the current FDD LTE system, the PMI feedback period is 5 ms. In the embodiment of the present application, the period in which the first device 101 feeds back the fourth channel information may be 2 ms or the like.
  • the first device 101 may separately generate fourth channel information for each subband in the system frequency band, perform feedback in a digital manner, and feed back with a short feedback period. This can effectively improve the feedback accuracy of the fourth channel information, so that the second device 102 can generate a more accurate precoding matrix.
  • Method 1 The fifth channel information is not quantized, and the analog quantity is directly fed back.
  • the second method uses a high-precision quantization method for the fifth channel information.
  • the quantization precision of the fifth channel information can be effectively controlled, and the accuracy of the fifth channel information obtained by the second device 102 can be ensured, thereby obtaining a more accurate precoding matrix, according to a more accurate pre-preparation.
  • the coding matrix performs data transmission to obtain better link adaptation effects and improve system performance.
  • the first device 101 may generate the fifth channel information for each subband in the system frequency band. For details, refer to FIG. 10 .
  • the first device 101 can transmit the fifth channel information in a short period.
  • the second device 102 can obtain denser fifth channel information, thereby generating a more accurate precoding matrix.
  • the LTE system is still taken as an example. If the first device 101 is a UE and the second device 102 is a base station, the period in which the UE sends the fifth channel information to the base station may not be greater than the feedback period of the PMI in the current LTE system. For example, in the current FDD LTE system, the PMI feedback period is 5 ms. In the embodiment of the present application, the period in which the first device 101 feeds back the fifth channel information may be 2 ms or the like.
  • the first device 101 may separately generate the fifth channel information for each subband in the system frequency band, and perform feedback by using a non-quantized analog method or a high-precision quantized digital method. And feedback with a short feedback cycle. This can effectively improve the feedback accuracy of the fifth channel information, so that the second device 102 can generate a more accurate precoding matrix.
  • the period in which the first device 101 sends the third channel information is not less than the period in which the fourth channel information is transmitted, and is not smaller than the period in which the fifth channel information is transmitted.
  • the third channel information and the fifth channel information are both fed back after quantization, then the third channel information is entered.
  • the quantized quantized bits of the row are not larger than the quantized bits for quantizing the fifth channel information.
  • FIG. 11 is a schematic structural diagram of a first first device according to an embodiment of the present application. As shown in FIG. 11, the first device includes: a receiving module 1101, a processing module 1102, and a sending module 1103.
  • the receiving module 1101 is configured to receive a reference signal from the second device.
  • the processing module 1102 is configured to obtain a precoding matrix according to the reference signal received by the receiving module 1101, and generate first channel information and second channel information for indicating a precoding matrix;
  • the sending module 1103 is configured to send the first channel information and the second channel information to the second device.
  • the accuracy of the first channel information is higher than the accuracy of the second channel information
  • the first channel information includes phase information of each element of the precoding matrix
  • the second channel information includes amplitude information of each element of the precoding matrix
  • the other implementation manners of the device may refer to the foregoing implementation of the first device 101 when generating and feeding back the foregoing first channel information and second channel information, where the receiving module 1101 may be used to implement the first device 101.
  • Receiving operations such as: receiving reference signals, data, and control information, etc.
  • the processing module 1102 can be used to implement processing operations of the first device 101, such as: performing channel estimation according to reference signals, generating channel information, etc.
  • the sending module 1103 can be used to implement the A transmitting operation of a device 101, such as transmitting channel information, data, and control information.
  • the receiving module 1101 is configured to receive a reference signal from the second device.
  • the processing module 1102 is configured to obtain a precoding matrix W according to the reference signal received by the receiving module 1101;
  • W is a matrix of N t rows and R columns
  • X is a matrix of N t /2 rows and M columns
  • X [b 0 , b 1 , ..., b M-1 ]
  • b i is a column vector of dimension N t /2, 0 ⁇ i ⁇ M-1
  • N t is the number of antenna ports for transmitting the reference signal of the second device
  • W 2 is a matrix of 2M rows and R columns, among them, Is a unit vector of dimension M, only the first element of the k m is 1, the value of the other elements are 0, and 0 ⁇ m ⁇ R-1, ⁇ n is the modulus of a complex number, 0 ⁇ n ⁇ R -1
  • M, R, N t are all positive integers
  • N t is an even number
  • the processing module 1102 is further configured to generate third channel information, fourth channel information, and fifth channel information:
  • the third channel information is used to indicate X;
  • Fourth channel information is used to indicate
  • the fifth channel information is used to indicate ⁇ 0 , . . . , ⁇ n , . . . , ⁇ R-1 ;
  • the accuracy of the third channel information is lower than the accuracy of the fifth channel information
  • the sending module 1103 is configured to send third channel information, fourth channel information, and fifth channel information to the second device.
  • the other implementation manners of the device may refer to the foregoing implementation of the first device 101 when generating and feeding back the foregoing third channel information, the fourth channel information, and the fifth channel information, where the receiving module 1101 may be used to implement
  • the receiving operation of the first device 101 such as: receiving reference signals, data, and control information, etc.
  • the processing module 1102 can be used to implement processing operations of the first device 101, such as: performing channel estimation according to the reference signal, generating channel information, etc.
  • 1103 can be used to implement a sending operation of the first device 101, such as: transmitting channel information, data, and control information.
  • FIG. 12 is a schematic structural diagram of a second first device according to an embodiment of the present application. As shown in FIG. 12, the first device includes a receiver 1201, a processor 1202, and a transmitter 1203.
  • a receiver 1201, configured to receive a reference signal from the second device
  • the processor 1202 is configured to obtain a precoding matrix according to the reference signal received by the receiver 1201, and generate first channel information and second channel information for indicating a precoding matrix;
  • the transmitter 1203 is configured to send the first channel information and the second channel information to the second device.
  • the accuracy of the first channel information is higher than the accuracy of the second channel information
  • the first channel information includes phase information of each element of the precoding matrix
  • the second channel information includes amplitude information of each element of the precoding matrix
  • the other implementation manners of the device may refer to the foregoing implementation of the first device 101 when generating and feeding back the foregoing first channel information and second channel information, where the receiver 1201 may be used to implement the first device 101.
  • Receiving operations such as: receiving reference signals, data and control information, etc.
  • the processor 1202 can be used to implement processing operations of the first device 101, such as: performing channel estimation according to reference signals, generating channel information, etc.
  • the transmitter 1203 can be used to implement the A transmitting operation of a device 101, such as transmitting channel information, data, and control information.
  • a receiver 1201, configured to receive a reference signal from the second device
  • the processor 1202 is configured to obtain a precoding matrix W according to the reference signal received by the receiver 1201;
  • W is a matrix of N t rows and R columns
  • X is a matrix of N t /2 rows and M columns
  • X [b 0 , b 1 , ..., b M-1 ]
  • b i is a column vector of dimension N t /2, 0 ⁇ i ⁇ M-1
  • N t is the number of antenna ports of the second device transmitting the reference signal
  • W 2 is a matrix of 2M rows and R columns, among them, Is a unit vector of dimension M, only the first element of the k m is 1, the value of the other elements are 0, and 0 ⁇ m ⁇ R-1, ⁇ n is the modulus of a complex number, 0 ⁇ n ⁇ R -1;
  • M, R, N t are all positive integers, and N t is an even number;
  • the processor 1202 is further configured to generate third channel information, fourth channel information, and fifth channel information:
  • the third channel information is used to indicate X;
  • Fourth channel information is used to indicate
  • the fifth channel information is used to indicate ⁇ 0 , . . . , ⁇ n , . . . , ⁇ R-1 ;
  • the accuracy of the third channel information is lower than the accuracy of the fifth channel information
  • the transmitter 1203 is configured to send third channel information, fourth channel information, and fifth channel information to the second device.
  • the other implementation manners of the device may refer to the foregoing implementation of the first device 101 when generating and feeding back the foregoing third channel information, fourth channel information, and fifth channel information, where the receiver 1201 may be used to implement
  • the receiving operation of the first device 101 for example, receiving reference signals, data, and control information, etc.
  • the processor 1202 is configured to implement processing operations of the first device 101, such as: performing channel estimation according to the reference signal, generating channel information, etc.
  • 1203 can be used to implement a sending operation of the first device 101, such as: transmitting channel information, data, and control information.
  • FIG. 13 is a schematic structural diagram of a first type of second device according to an embodiment of the present application. As shown in FIG. 13, the second device includes: a receiving module 1301, a processing module 1302, and a sending module 1303.
  • the sending module 1303 is configured to send a reference signal to the first device.
  • the receiving module 1301 is configured to receive first channel information and second channel information from the first device, where the first channel information and the second channel information are used to indicate a precoding matrix, where the precoding matrix is received by the first device. Obtained by the reference signal;
  • the accuracy of the first channel information is higher than the accuracy of the second channel information
  • the first channel information includes phase information of each element of the precoding matrix, and the second channel information includes amplitude information of each element of the precoding matrix;
  • the processing module 1302 is configured to determine a precoding matrix according to the first channel information and the second information.
  • the sending module 1303 is further configured to send data to the first device according to the precoding matrix determined by the processing module 1302.
  • the other implementation manners of the device may refer to the foregoing implementation of the second device 102 when receiving the first channel information and the second channel information, where the receiving module 1301 may be used to implement the second
  • the receiving operation of the device 102 is performed, for example, receiving channel information, data, and other control information.
  • the processing module 1302 is configured to implement processing operations of the second device 102, such as: generating a precoding matrix according to the channel information, and determining according to the generated precoding matrix.
  • the sending module 1303 can be used to implement the sending operation of the second device 102, such as sending a reference signal, data, and control information.
  • the sending module 1303 is configured to send a reference signal to the first device.
  • the receiving module 1301 is configured to receive third channel information, fourth channel information, and fifth channel information from the first device, where the accuracy of the third channel information is lower than that of the fifth channel information;
  • the processing module 1302 is configured to determine a precoding matrix W according to the third channel information, the fourth channel information, and the fifth channel information;
  • the sending module 1303 is configured to send data to the first device according to the precoding matrix W determined by the processing module 1302.
  • the precoding matrix W is obtained by the first device according to the received reference signal;
  • W 2 is a matrix of 2M rows and R columns, among them, Is a unit vector of dimension M, only the first element of the k m is 1, the value of the other elements are 0, and 0 ⁇ m ⁇ R-1, ⁇ n is the modulus of a complex number, 0 ⁇ n ⁇ R -1; M, R, N t are all positive integers, and N t is an even number;
  • the third channel information is used to indicate X;
  • Fourth channel information is used to indicate
  • the fifth channel information is used to indicate ⁇ 0 , . . . , ⁇ n , . . . , ⁇ R-1 .
  • the other implementations of the device may refer to the foregoing implementation of the second device 102 when receiving the third channel information, the fourth channel information, and the fifth channel information, where the receiving module 1301 may be used to implement the second device 102.
  • the receiving operation is performed, for example, receiving channel information, data, and other control information.
  • the processing module 1302 is configured to implement processing operations of the second device 102, such as: generating a precoding matrix according to the channel information, and determining data transmission according to the generated precoding matrix.
  • the transmitting module 1303 can be configured to implement a sending operation of the second device 102, such as: sending a reference signal, data, and control information.
  • FIG. 14 is a schematic structural diagram of a second second device according to an embodiment of the present application. As shown in FIG. 14, the second device includes a receiver 1401, a processor 1402, and a transmitter 1403.
  • a transmitter 1403, configured to send a reference signal to the first device
  • the receiver 1401 is configured to receive first channel information and second channel information from the first device, where the first channel information and the second channel information are used to indicate a precoding matrix, where the precoding matrix is received by the first device. Obtained by the reference signal;
  • the accuracy of the first channel information is higher than the accuracy of the second channel information
  • the first channel information includes phase information of each element of the precoding matrix, and the second channel information includes amplitude information of each element of the precoding matrix;
  • the processor 1402 is configured to determine a precoding matrix according to the first channel information and the second information.
  • the transmitter 1403 is further configured to send data to the first device according to the precoding matrix determined by the processor 1402.
  • the other implementations of the device may refer to the foregoing implementation of the second device 102 when receiving the first channel information and the second channel information, where the receiver 1401 may be used to implement the receiving operation of the second device 102, such as Receiving channel information, data, and other control information, etc.; the processor 1402 is configured to implement processing operations of the second device 102, such as: generating a precoding matrix according to the channel information, determining a data transmission manner according to the generated precoding matrix, and the like; 1403 can be used to implement a transmitting operation of the second device 102, such as: transmitting a reference signal, data, and control information.
  • a transmitter 1403, configured to send a reference signal to the first device
  • the receiver 1401 is configured to receive third channel information, fourth channel information, and fifth channel information from the first device, where the accuracy of the third channel information is lower than that of the fifth channel information;
  • the processor 1402 is configured to determine a precoding matrix W according to the third channel information, the fourth channel information, and the fifth channel information;
  • the transmitter 1403 is configured to send data to the first device according to the precoding matrix W determined by the processor 1402.
  • the precoding matrix W is obtained by the first device according to the received reference signal;
  • W 2 is a matrix of 2M rows and R columns, among them, Is a unit vector of dimension M, only the first element of the k m is 1, the value of the other elements are 0, and 0 ⁇ m ⁇ R-1, ⁇ n is the modulus of a complex number, 0 ⁇ n ⁇ R -1; M, R, N t are all positive integers, and N t is an even number;
  • the third channel information is used to indicate X;
  • Fourth channel information is used to indicate
  • the fifth channel information is used to indicate ⁇ 0 , . . . , ⁇ n , . . . , ⁇ R-1 .
  • the implementation of the device may refer to the foregoing implementation of the second device 102 when receiving the third channel information, the fourth channel information, and the fifth channel information, where the receiver 1401 may be used to implement the second device 102.
  • the receiving operation for example, receiving channel information, data, and other control information, etc.;
  • the processor 1402 is configured to implement processing operations of the second device 102, such as: generating a precoding matrix according to the channel information, and determining data transmission according to the generated precoding matrix. Way, etc.; transmitter 1403 can be used to implement a transmitting operation of the second device 102, such as: transmitting a reference signal, data, and control information.
  • an embodiment of the present application provides a channel information transmission apparatus, method, and system.
  • feedback channel information is used to compare information with high reliability and high accuracy, the feedback precision used is high.
  • feedback is performed with lower feedback accuracy. In this way, while ensuring the accuracy of the channel information, the system overhead is effectively reduced and the system performance is improved.
  • embodiments of the present application can be provided as a method, system, or computer program product.
  • the present application can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment in combination of software and hardware.
  • the application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) including computer usable program code.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. Instructions are provided for implementation in the flowchart The steps of a process or a plurality of processes and/or block diagrams of a function specified in a block or blocks.

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Abstract

一种信道信息传输装置、方法和系统,以提高信道信息的反馈精度。一种第一设备,包括:接收模块,用于接收来自第二设备的参考信号;处理模块,用于根据参考信号得到预编码矩阵,以及生成用于指示预编码矩阵的第一信道信息和第二信道信息;发送模块,用于向第二设备发送第一信道信息和第二信道信息;其中,第一信道信息的精度比第二信道信息的精度高;第一信道信息包括预编码矩阵的每一个元素的相位信息,第二信道信息包括预编码矩阵的每一个元素的幅度信息。对于还原信道矩阵比较关键、精度要求高的预编码矩阵的相位信息比幅度信息的精度高,一方面可以降低信道信息反馈的开销,另一方面,还能够保证信道信息反馈的精度。

Description

一种信道信息传输装置、方法和系统 技术领域
本申请涉及无线通信技术领域,尤其涉及一种信道信息传输装置、方法和系统。
背景技术
目前,在长期演进(Long Term Evolution,LTE)频分双工(Frequency Division Duplexing,FDD)系统中,用户设备(User Equipment,UE)根据基站发送的参考信号进行信道估计,然后确定信道的状态信息并进行反馈,信道状态信息包括秩指示(Rank Indicator,RI),预编码矩阵索引(Precoding Matrix Indicator,PMI)和信道质量指示(Channel Quality Indicator,CQI)。
其中,PMI是对预编码矩阵的索引,UE向基站反馈PMI,基站根据收到的PMI确定对应的预编码矩阵,并根据确定的预编码矩阵进行预编码处理,以提高下行通信质量。UE对PMI反馈的精度决定了基站到UE的下行链路的自适应性能。
如何提高PMI等预编码矩阵相关的信道信息的反馈精度,以提高下行链路自适应性能,是一个亟待解决的问题。
发明内容
有鉴于此,提供一种信道信息传输装置、方法和系统,用以提高预编码矩阵相关的信道信息的反馈精度,进而提高下行链路的自适应性能。
第一方面,提供一种信道信息传输方法,该方法中,第二设备发送参考信号,第一设备根据接收到的所述参考信号进行信道估计,生成预编码矩阵,并生成用于指示所述预编码矩阵的第一信道信息和第二信道信息,以及将生成的第一信道信息和第二信道信息发送给第二设备。第二设备根据接收到的第一信道信息和第二信道信息生成预编码矩阵,并根据生成的预编码矩阵向 第一设备发送数据。
其中,所述第一信道信息的精度比所述第二信道信息的精度高;所述第一信道信息包括预编码矩阵的每一个元素的相位信息,所述第二信道信息包括所述预编码矩阵的每一个元素的幅度信息。
其中,信道信息中相位信息对于还原信道矩阵比较关键、精度要求高,而幅度信息对于还原信道矩阵不是关键的信息,精度可以较低,因此预编码矩阵的相位信息比幅度信息的精度高,一方面可以降低信道信息反馈的开销,另一方面,还能够保证信道信息反馈的精度。
或者,第一设备在生成预编码矩阵后,仅生成用于指示所述预编码矩阵的第一信道信息,不生成上述第二信道信息,在向第二设备发送信道信息时,仅发送第一信道信息,可选地,该第一信道信息是未经过量化的信道信息,或经过量化后的信道信息。可选地,该第一信道信息是针对系统频带中的每一个预设的子频带分别生成的。第二设备在收到第一信道信息后,根据第一信道信息生成预编码矩阵,并根据生成的预编码矩阵向第一设备发送数据。第二设备在生成预编码矩阵时,可按照预设的幅度值作为预编码矩阵的每一个元素的幅度值来生成预编码矩阵,或者也可根据秩的值、发送天线端口数等信息确定幅度值,再将确定的幅度值作为预编码矩阵的每一个元素的幅度值来生成预编码矩阵。由于具备了第一信道信息,可通过较高精度地反馈第一信道信息,从而使得第二设备根据第一信道信息获得较精确的预编码矩阵,按照较精确的预编码矩阵进行数据发送,可获得较好的链路自适应的效果,提高系统性能。
实现第一信道信息比第二信道信息精度高的方式有多种,在具体实现时,可结合下面的一种或多种方式:
所述第一信道信息是未经过量化的信道信息,所述第二信道信息是经过量化后的信道信息;
所述第一信道信息和所述第二信道信息均为经过量化后的信道信息,且所述第一信道信息的量化位数大于所述第二信道信息的量化位数;
所述第一设备是针对系统频带中的每一个预设的子频带分别生成所述第一信道信息,并针对整个系统带宽生成所述第二信道信息的;
所述第一信道信息的发送周期比所述第二信道信息的发送周期小。
通过以较小的周期、较密集的频带、较高的量化位数或不进行量化等,可实现相位信息的较高精度的反馈。
在一种可选的实现方式中,所述第一信道信息包括:K组第一信道子信息;所述K为正整数,是所述预编码矩阵包含的列向量的个数;每一个列向量对应一组第一信道子信息;
所述第一信道子信息包括:
第一信道基本子信息,为所述第一信道子信息对应的列向量中的参考元素的相位信息,所述参考元素的相位不为零;
L-2个第一信道相对子信息,其中,L为所述列向量的长度,一个所述第一信道相对子信息对应于所述列向量中除了所述参考元素之外的一个相位非零的元素,用于表示对应元素的相位与所述参考元素相位的偏差;
所述第一信道基本子信息是未经过量化的信道信息,所述第一信道相对子信息是经过量化后的信道信息。
对于该可选的实现方式,所述第二信道信息可为经过量化后的信道信息,且每一个第一信道相对子信息的量化位数均大于所述第二信道信息的量化位数。
对于该可选的实现方式,所述第二信道信息可为经过量化后的信道信息,且每一个第一信道相对子信息的量化位数均大于所述第二信道信息的量化位数。
第二方面,提供一种第一设备,该第一设备具有实现第一方面的方法中第一设备行为的功能。所述功能可以通过硬件实现,也可以通过硬件执行相应的软件实现。所述硬件或软件包括一个或多个与上述功能相对应的模块。
在一种可选的实现方式中,该第一设备的结构中包括处理器、接收器和 发送器,所述处理器被配置为支持第一设备执行上述第一方面的方法中相应的功能。所述接收器用于第一设备接收参考信号,进一步地,还可用于第一设备接收数据。所述发送器用于第一设备发送信道信息,进一步地,还可用于第一设备发送数据。所述第一设备还可以包括存储器,所述存储器用于与处理器耦合,其保存第一设备必要的程序指令和数据。
第三方面,提供一种第二设备,该第二设备具有实现第一方面的方法中第二设备行为的功能。所述功能可以通过硬件实现,也可以通过硬件执行相应的软件实现。所述硬件或软件包括一个或多个与上述功能相对应的模块。
在一种可选的实现方式中,该第二设备的结构中包括处理器、接收器和发送器,所述处理器被配置为支持第二设备执行上述第一方面的方法中相应的功能。所述发送器用于第二设备发送参考信号,进一步地,还可用于第二设备发送数据。所述接收器用于第二设备接收信道信息,进一步地,还可用于第二设备接收数据。所述第二设备还可以包括存储器,所述存储器用于与处理器耦合,其保存第二设备必要的程序指令和数据。
第四方面,提供了一种无线通信系统,该无线通信系统包括上述第一方面所述的第一设备和第二设备。
第五方面,提供了一种计算机存储介质,用于储存为上述第一方面中第一设备所用的计算机软件指令,其包含用于执行上述方面所涉及的程序。
第六方面,提供了一种计算机存储介质,用于储存为上述第一方面中第二设备所用的计算机软件指令,其包含用于执行上述方面所涉及的程序。
第七方面,提供了一种信道信息传输方法,该方法中,第二设备发送参考信号,第一设备根据接收到的参考信号进行信道估计,生成预编码矩阵W。其中,W是Nt行R列的矩阵,且
Figure PCTCN2016092522-appb-000001
X是Nt/2行M列的矩阵,且X=[b0,b1,…,bM-1],bi是维度为Nt/2的列向量,0≤i≤M-1,Nt为所述第二设备的发送所述参考信号的天线端口数;W2为2M行R列的矩阵,
Figure PCTCN2016092522-appb-000002
其中,
Figure PCTCN2016092522-appb-000003
是维度为M的单位向量,只有第km个元素的值为1,其他元素的值均为0,且0≤m≤R-1,φn是模为1的复数,0≤n≤R-1;M、R、Nt均为正整数,且Nt为偶数。
所述第一设备生成第三信道信息、第四信道信息和第五信道信息:所述第三信道信息用于指示X;所述第四信道信息用于指示
Figure PCTCN2016092522-appb-000004
所述第五信道信息用于指示φ0,…,φn,…,φR-1
其中,所述第三信道信息的精度比所述第五信道信息的精度低。所述第一设备向所述第二设备发送所述第三信道信息、所述第四信道信息和所述第五信道信息。
第二设备根据收到的第三信道信息、第四信道信息和第五信道信息生成预编码矩阵,并根据生成的预编码矩阵向第一设备发送数据。
其中,信道信息中第五信道信息对于还原信道矩阵比较关键、精度要求高,而第三信息信息并不是还原信道矩阵所需的关键信息,精度可以较低,因此第五信道信息比第三信道信息的反馈精度较高,一方面可以降低信道信息反馈的开销,另一方面,还能够保证信道信息反馈的精度。
实现第五信道信息比第三信道信息精度高的方式有多种,在具体实现时,可结合下面的一种或多种方式:
1、是否量化以及量化的位数;
2、信道信息是针对整个系统带宽生成的,还是针对各个预设的子频带分别生成的;
比如:所述第一设备是针对整个系统带宽生成所述第三信道信息,并针对系统频带中的每一个预设的子频带分别生成所述第四信道信息和所述第五信道信息的;
3、通过控制信道信息的发送周期实现第五信道信息的反馈精度高;
比如:所述第三信道信息的发送周期比所述第四信道信息的发送周期大,且所述第三信道信息的发送周期比所述第五信道信息的发送周期大。
在通过量化实现第五信道信息的反馈精度比第三信道信息的反馈精度高时,可采用如下任一方式:
所述第三信道信息是经过量化后的信道信息,所述第五信道信息是未经过量化的信道信息;或者
所述第三信道信息和所述第五信道信息均为经过量化后的信道信息,且所述第三信道信息所指示的每一个向量的量化位数比所述第五信道信息的量化位数少;或者
所述第三信道信息和所述第五信道信息均为经过量化后的信道信息,且所述第三信道信息所指示的每一个向量的量化位数均比所述第五信道信息所指示的的任意一个φn的量化位数少;或者
所述第三信道信息和所述第五信道信息均为经过量化后的信道信息,且所述第三信道信息所指示的任何一个向量的每一个元素的量化位数均比所述第五信道信息所指示的任意一个φn的量化位数少。
第八方面,提供一种第一设备,该第一设备具有实现第七方面的方法中第一设备行为的功能。所述功能可以通过硬件实现,也可以通过硬件执行相应的软件实现。所述硬件或软件包括一个或多个与上述功能相对应的模块。
在一种可选的实现方式中,该第一设备的结构中包括处理器、接收器和发送器,所述处理器被配置为支持第一设备执行上述第一方面的方法中相应的功能。所述接收器用于第一设备接收参考信号,进一步地,还可用于第一设备接收数据。所述发送器用于第一设备发送信道信息,进一步地,还可用于第一设备发送数据。所述第一设备还可以包括存储器,所述存储器用于与处理器耦合,其保存第一设备必要的程序指令和数据。
第九方面,提供一种第二设备,该第二设备具有实现第七方面的方法中第二设备行为的功能。所述功能可以通过硬件实现,也可以通过硬件执行相 应的软件实现。所述硬件或软件包括一个或多个与上述功能相对应的模块。
在一种可选的实现方式中,该第二设备的结构中包括处理器、接收器和发送器,所述处理器被配置为支持第二设备执行上述第一方面的方法中相应的功能。所述发送器用于第二设备发送参考信号,进一步地,还可用于第二设备发送数据。所述接收器用于第二设备接收信道信息,进一步地,还可用于第二设备接收数据。所述第二设备还可以包括存储器,所述存储器用于与处理器耦合,其保存第二设备必要的程序指令和数据。
第十方面,提供了一种无线通信系统,该无线通信系统包括上述第七方面所述的第一设备和第二设备。
第十一方面,提供了一种计算机存储介质,用于储存为上述第七方面中第一设备所用的计算机软件指令,其包含用于执行上述方面所涉及的程序。
第十二方面,提供了一种计算机存储介质,用于储存为上述第七方面中第二设备所用的计算机软件指令,其包含用于执行上述方面所涉及的程序。
附图说明
图1为本申请的实施例提供的无线通信系统的结构示意图;
图2为本申请的实施例中的信道估计的流程图;
图3为本申请的实施例提供的第一种上报信道信息方案的流程图;
图4为本申请的实施例中,第一设备针对整个系统频带的每一个子频带生成第一信道信息的示意图;
图5为本申请的实施例中,第一设备针对整个系统频带生成第二信道信息的示意图;
图6为本申请的实施例提供的第二种上报信道信息方案的流程图;
图7为本申请的实施例中,第一设备针对整个系统频带生成第三信道信息的示意图;
图8为本申请的实施例中,第一设备将第三信道信息调制到ZC序列上发送的示意图;
图9为本申请的实施例中,第一设备针对整个系统频带的每一个子频带生成第四信道信息的示意图;
图10为本申请的实施例中,第一设备针对整个系统频带的每一个子频带生成第五信道信息的示意图;
图11为本申请的实施例提供的第一种第一设备的结构示意图;
图12为本申请的实施例提供的第二种第一设备的结构示意图;
图13为本申请的实施例提供的第一种第二设备的结构示意图;
图14为本申请的实施例提供的第二种第二设备的结构示意图。
具体实施方式
为了更好地理解本申请的上述目的、方案和优势,下文提供了详细描述。该详细描述通过使用框图、流程图等附图和/或示例,阐明了装置和/或方法的各种实施方式。在这些框图、流程图和/或示例中,包含一个或多个功能和/或操作。本领域技术人员将理解到:这些框图、流程图或示例内的各个功能和/或操作,能够通过各种各样的硬件、软件、固件单独或共同实施,或者通过硬件、软件和固件的任意组合实施。
为了使得本申请的实施例更容易被理解,下面,首先对本申请的实施例中涉及的一些描述加以说明,这些说明不应视为对本发明所要求的保护范围的限定。
一、信道矩阵
假定无线通信系统中,发送信号为x,接收信号为y,x到y之间的信道的信道冲激响应为h,加性高斯噪声为n,则接收信号y和发送信号x之间满足如下关系:
y=hx+n
对于一个有Nt个发送天线和Nr个接收天线的多入多出(Multiple Input Multiple Output,MIMO)系统,接收信号y和发送信号x之间满足如下关系:
y=Hx+n
x∈fNt×1,y∈fNr×1,H为信道矩阵,H∈fNr×Nt,n∈fNr×1
信道矩阵H的第i行第j列表示从第j个发送天线到第i个接收天线的复信道增益。
当Nt=1,Nr>1时,MIMO系统为单入多出(Single Input Multiple Output,SIMO)系统;当Nt>1,Nr=1时,MIMO系统为多入单出(Multiple Input Single Output,MISO)系统,SIMO系统和MISO系统均可视为MIMO系统的特例。本申请的实施例适用于MIMO系统。
二、预编码矩阵
信号的发送端获得发送端到接收端之间的信道的信道信息,则可根据获得的信道信息对发送信号进行预处理,可在发送端预先消除数据流之间的部分或全部干扰,实现数据发送的链路自适应,即按照不同的信道条件采用不同的数据发送方式,尽量降低数据流之间的干扰。
发送端进行预编码处理时使用的矩阵即为“预编码矩阵”。
发送端采用预编码处理后的接收信号y和发送信号x之间的关系可如下面的公式所示:
y=HFx+n
其中,F为预编码矩阵。
三、目前LTE FDD系统中下行发送时的预处理的方法
基站向UE发送测量参考信号,UE根据接收的测量参考信号进行信道估计,进而获得信道矩阵H,并从预设的码本集合中C={Wi}中,选择一个预编码矩阵S,使得容量最大化或者信噪比(Signal to Noise Ratio,SNR)最大化。UE将选择的预编码矩阵的索引PMI反馈给基站。
比如:天线端口数为2的码本如下表所示,目前,秩为1的预编码矩阵只有4个。
Figure PCTCN2016092522-appb-000005
可见,UE反馈的预编码矩阵是经过量化的,因此存在误差,导致基站获得的信道信息不准确,链路自适应性能差。
四、另一种反馈信道信息的方法
基站向UE发送测量参考信号,UE根据接收的测量参考信号进行信道估计,进而获得信道矩阵H,UE直接将用于描述H的信道信息反馈给基站。此时,需要反馈的信息量较大,开销大,导致数据传输效率降低,进而系统性能降低。
本申请的实施例中,在反馈的信道信息中对于还原信道矩阵比较关键、精度要求高的信息,采用的反馈精度较高,比如:不进行量化或进行量化但量化位数较多,再比如:采用较短的周期进行反馈,再比如:针对系统带宽中的每一个预设的子频带分别反馈而不是针对整个系统带宽反馈。
比如:下面方案一中的第一信道信息,即未经过量化的预编码矩阵的每一个元素的相位信息;再比如:下面方案二中的第四信道信息(比如:列选择信息)和第五信道信息(比如:联合-相位(co-phasing)信息)。对于这些信息,采用较高的反馈精度进行反馈。
可选地,在反馈的信道信息中,对于还原信道矩阵不太关键、精度要求不高的信息,采用较低的反馈精度进行反馈。比如:量化时量化的位数较少;再比如:采用较长的反馈周期进行反馈,再比如:针对整个系统带宽反馈。
比如:下面方案一中的第二信道信息,即预编码矩阵的每一个元素的幅度信息,再比如:下面方案二中的第三信道信息。对于这些信息,采用较低 的精度进行反馈。
这样在保证信道信息精确的同时,有效减小了系统开销,提高了系统性能。
下面,结合附图对本申请的实施例进行详细说明。
图1为本申请的实施例提供的无线通信系统的结构示意图。如图1所示,该无线通信系统包括:第一设备101和第二设备102。
其中,第二设备102向第一设备101发送参考信号,第一设备101根据从第二设备102接收的参考信号进行信道估计,并将用于表示信道估计结果的信道信息发送给第二设备102;第二设备102根据接收的信道信息,向第一设备101进行数据发送。
第一设备101和第二设备102的上述交互过程可如图2所示。
其中,第一设备101可为网络设备,比如:基站,第二设备102可为终端设备;或者第一设备101可为终端设备,第二设备102可为网络设备;再或者第一设备101和第二设备102均为终端设备;再或者,第一设备101和第二设备102均为网络设备。
只要第二设备102向第一设备101发送参考信号,第一设备101根据参考信号进行信道估计并反馈信道信息,都可使用本申请的实施例提供的方案进行信道信息上报以及数据发送,以获取更精确的信道估计结果,提高链路自适应性能。
并且,无论第一设备101和第二设备102之间通信时采用何种双工方式,比如前述的FDD双工方式,抑或是时分双工(Time Division Duplexing,TDD)的双工方式,均可使用本申请的实施例提供的方案,获取精确的信道估计结果,提高链路自适应性能。
其中,第一设备101和第二设备102之间通信的通信制式可包括但不限于:全球移动通信系统(Global System of Mobile communication,GSM)、码分多址(Code Division Multiple Access,CDMA)IS-95、码分多址(Code Division Multiple Access,CDMA)2000、时分同步码分多址(Time  Division-Synchronous Code Division Multiple Access,TD-SCDMA)、宽带码分多址(Wideband Code Division Multiple Access,WCDMA)、时分双工-长期演进(Time Division Duplexing-Long Term Evolution,TDD LTE)、频分双工-长期演进(Frequency Division Duplexing-Long Term Evolution,FDD LTE)、长期演进-增强(Long Term Evolution-Advanced,LTE-advanced)、个人手持电话系统(Personal Handy-phone System,PHS)、802.11系列协议规定的无线保真(Wireless Fidelity,WiFi)、全球微波互联接入(Worldwide Interoperability for Microwave Access,WiMAX),以及未来演进的各种无线通信系统。
其中,前述的终端设备可以是无线终端,无线终端可以是指向用户提供语音和/或数据连通性的设备,具有无线连接功能的手持式设备、或连接到无线调制解调器的其他处理设备。无线终端可以经无线接入网(例如,RAN,Radio Access Network)与一个或多个核心网进行通信,无线终端可以是移动终端,如移动电话(或称为“蜂窝”电话)和具有移动终端的计算机,例如,可以是便携式、袖珍式、手持式、计算机内置的或者车载的移动装置,它们与无线接入网交换语言和/或数据。例如,个人通信业务(PCS,Personal Communication Service)电话、无绳电话、会话发起协议(SIP)话机、无线本地环路(WLL,Wireless Local Loop)站、个人数字助理(PDA,Personal Digital Assistant)等设备。无线终端也可以称为订户单元(Subscriber Unit)、订户站(Subscriber Station),移动站(Mobile Station)、移动台(Mobile)、远程站(Remote Station)、接入点(Access Point)、远程终端(Remote Terminal)、接入终端(Access Terminal)、用户终端(User Terminal)、用户代理(User Agent)、用户设备(User Device)、或用户设备(User Equipment)。
前述的网络设备可包括基站,或用于控制基站的无线资源管理设备,或包括基站和用于控制基站的无线资源管理设备;其中基站可为宏站或小站,比如:小小区(small cell)、微小区(pico cell)等,基站也可为家庭基站,比如:家庭节点B(Home NodeB,HNB)、家庭演进节点B(Home eNodeB,HeNB)等,基站也可包括中继节点(relay)等。
比如:对于TDD LTE、FDD LTE或LTE-A等LTE系统,前述的网络设备可为演进节点B(evolved NodeB,eNodeB),终端设备可为UE;对于TD-SCDMA系统或WCDMA系统,前述的网络设备可包括:节点B(NodeB)和/或无线网络控制器(Radio Network Controller,RNC),终端设备可为UE;对于GSM系统,前述的网络设备可包括基站收发台(Base Transceiver Station,BTS)和/或基站控制器(Base Station Controller,BSC),终端设备可为移动台(Mobile Station,MS);对于WiFi系统,前述的网络设备可包括:接入点(Access Point,AP)和/或接入控制器(Access Controller,AC),终端设备可为站点(STAtion,STA)。
下面的图3和图6分别示出了两种上报信道信息的方案。
下面,分别描述图3和图6示的两种方案。
图3示出了本申请的实施例提供的第一种信道信息上报方案的流程。如图3所示,该流程包括如下步骤:
S301:第二设备102向第一设备101发送参考信号,该参考信号用于对第二设备102到第一设备101的信道进行信道估计。
可选地,当第二设备102为LTE系统中的基站,第一设备101为LTE系统中的用户设备时,该参考信号可以为解调参考(DeModulation Reference Signal,DMRS)信号。
S302:第一设备101根据参考信号进行信道估计,得到信道矩阵H;
S303:第一设备101根据信道矩阵H得到预编码矩阵。
其中,第一设备101在根据信道矩阵H得到预编码矩阵时,可采用奇异值分解(Singular Value Decomposition,SVD)或其他方式。
S304:第一设备101生成用于描述预编码矩阵(记为“矩阵W”)的第一信道信息和第二信道信息。
其中,第一信道信息包括矩阵W的每一个元素的相位信息;
第二信道信息包括矩阵W的每一个元素的幅度信息。
S305:第一设备101将生成的第一信道信息和第二信道信息发送给第二 设备102。
第一设备101可将第一信道信息和第二信道信息一同发送给第二设备102,也可将这两种信道信息分别发送给第二设备102。
比如:若第一信道信息和第二信道信息经过量化,则经过编码、调制等处理后,发给第二设备102;若第一信道信息和第二信道信息未经过量化,则可直接将第一信道信息和第二信道信息承载于ZC序列上发送给第二设备102。由于ZC序列的自相关特性和互相关特性较好,第二设备102在从ZC序列上获取信道信息时,可获得较好的信号解调性能,提高信道信息获取的准确性。
ZC序列仅为一种示例,第一信道信息和第二信道信息也可承载于其他序列上发送或者使用其它方式发送,只要第二设备102能够获取信道信息即可。
承载于ZC序列等序列上的方式实际上采用的是物理层的发送方式,实际上,信道信息也可采用媒体接入控制(Medium Access Control,MAC)信令、或高层信令,比如(Radio Resource Control,RRC)信令传送等。
S306:第二设备102根据收到的第一信道信息和第二信道信息生成预编码矩阵,并根据生成的预编码矩阵确定向第一设备101进行数据发送时使用的发送方式;其中,第二设备102根据生成的预编码矩阵,确定数据发送方式的方法,可参考目前的基站根据经过量化的预编码矩阵确定数据发送方式的方法。
S307:第二设备102采用确定的发送方式向第一设备101进行数据发送。
其中,步骤S304中,第一设备101在生成第一信道信息时,可针对系统频带中的每一个预设的子频带生成第一信道信息。
这是因为,经大量的仿真和实验发现,矩阵W的每一个元素的相位信息对于还原信道矩阵是较关键的,而矩阵W的每一个元素的幅度信息相对于相位信息来说并不是那么重要。因此,第一设备101在反馈信道信息时,第一信道信息的精度比第二信道信息的精度高,具体实现时可综合量化、反馈周期、是否针对子频带或整个系统带宽生成信道信息等多种手段,比如:
第一信道信息是未经过量化的信道信息,第二信道信息是经过量化后的信道信息;
第一信道信息和第二信道信息均为经过量化后的信道信息,且第一信道信息的量化位数大于第二信道信息的量化位数;
第一信道信息是针对系统频带中的每一个预设的子频带分别生成的,第二信道信息是针对整个系统带宽生成的;
第一信道信息的发送周期比第二信道信息的发送周期小。
下面对于第一信道信息和第二信道信息的反馈分别进行具体描述。
一、第一信道信息的生成和反馈方式
1、量化方式
对于第一信道信息,可采用如下量化方式之一:
方式一、不对第一信道信息进行量化,直接反馈模拟量。
方式二、对第一信道信息采用高精度的量化方式。
通过对第一信道信息采用高精度的量化方式,可保证第二设备102获得的第一信道信息的精度,进而获得较精确的预编码矩阵,按照较精确的预编码矩阵进行数据发送,可获得较好的链路自适应的效果,提高系统性能。
可选地,对第一信道信息量化的量化位数不小于对第二信道信息量化的量化位数。这样,对于第一信道信息和第二信道信息区分对待,对于还原信道矩阵关键的相位信息采用高精度量化,对于不那么关键的幅度信息采用低精度量化,可既保证一定的信道信息反馈的精度,又能有效降低信息反馈量,减少系统开销,提高数据传输效率。
方式三、对第一信道信息分组发送,每组中部分信息未经过量化,部分信息进行高精度量化。
其中,将第一信道信息分为K组第一信道子信息;K为正整数,是矩阵W包含的列向量的个数;每一个列向量对应一组第一信道子信息。
其中,第一信道子信息又包括:
第一信道基本子信息,为第一信道子信息对应的列向量中的参考元素的 相位信息,参考元素的相位不为零,第一信道基本子信息未经过量化;
L-2个第一信道相对子信息,其中,L为列向量的长度,即第二设备102发送天线端口数。一个第一信道相对子信息对应于列向量中除了参考元素之外的一个相位非零的元素,用于表示对应元素的相位与参考元素相位的偏差,且第一信道相对子信息是经过量化后的信道信息。
可选地,对第一信道相对子信息量化的量化位数不小于对第二信道信息量化的量化位数。同样地,这样,对于第一信道信息和第二信道信息区分对待,对于还原信道矩阵关键的相位信息采用高精度量化,对于不那么关键的幅度信息采用低精度量化,可既保证一定的信道信息反馈的精度,又能有效降低信息反馈量,减少系统开销,提高数据传输效率。
下面,举例对方式三加以说明。
设矩阵W的任意一个列向量的相位信息可以表示为
Figure PCTCN2016092522-appb-000006
其中,
Figure PCTCN2016092522-appb-000007
为列向量v的前L-1个元素的相位。L为第二设备102的发送天线端口数。使用其中任意一个相位表示其他相位。例如:
Figure PCTCN2016092522-appb-000008
公式2中,参考元素为第一个元素
Figure PCTCN2016092522-appb-000009
(当然,参考元素也可为列向量中的其他元素,只要相位不为零即可)。上述第一信道基本子信息,即用于描述
Figure PCTCN2016092522-appb-000010
第一设备101在反馈时可使用模拟量的方式对
Figure PCTCN2016092522-appb-000011
进行反馈。
其中,d1,d2,…,dL-2即为前述的L-2个第一信道相对子信息所描述的信息,对于这些相关系数,可在量化后反馈。
这样,对于一个列向量的所有相位信息,只需要反馈1个模拟量和L-2个量化后的数字量。比起直接反馈L-1个模拟量降低了开销。
2、生成方式
参考图4,假设整个系统频带被预先分为10个子频带(subband),如图4 中所示的子频带1~子频带10。
可选地,第一设备101针对这10个子频带中的每一个子频带,均生成对应的第一信道信息。
以LTE系统为例,第一设备101可以每P个RB为一组来测量预编码矩阵,P为正整数。比如:对于10MHz的系统频带(50资源块(Resource Block,RB)),第一设备101以每10个RB为一组来测量预编码矩阵,反馈该预编码矩阵的相位信息,就是子带反馈。
这样,第二设备102就可得到每一个子频带的第一信道信息,相比于宽带反馈(即针对整个系统频带反馈一个信道信息)而言,反馈精度较高,同样可有效提高系统性能。
其中,子频带的宽度可为一个预设的值,或也可由第一设备101依具体情况而定,再或者由第二设备102通过消息通知第一设备101。比如:第一设备101根据接收到的参考信号进行信道估计,确定信道质量较好时,可将该子频带的宽度设置为较大的值;确定信道质量较差时,可将该子频带的宽度设置为较小的值,尽量反馈较高精度的第一信道信息。再比如:第一设备101可根据待发送的数据量来设置该子频带的宽度,当待发送的数据量较少时,可将该子频带的宽度设置为较小的值,第一信道信息的开销较大,但由于待发送的数据量少,对系统性能影响不大;若待发送的数据量较大,可将该子频带的宽度设置为较大的值,以降低第一信道信息的开销,保证数据发送。
3、反馈周期
第一设备101可以较短的周期反馈第一信道信息,以较长的周期反馈第二信道信息。这样,第二设备102能够获得较密集的第一信道信息,从而生成较精确的预编码矩阵。
比如:以LTE系统为例,若第一设备101为UE,第二设备102为基站,UE向基站发送第一信道信息的周期可不大于目前LTE系统中的PMI的反馈周期。比如:目前FDD LTE系统中PMI反馈周期为5毫秒(ms),那么本申请的实施例中,第一设备101反馈第一信道信息的周期可以是2ms。
综上,第一设备101在生成和反馈第一信道信息时,可针对各个子频带生成第一信道信息,采用非量化的模拟方式,或高精度量化的数字方式进行反馈,并且以较短的反馈周期反馈。这样可使得第二设备102获得较精确的相对重要的相位信息。
二、第二信道信息的生成和反馈方式
1、量化方式
对第二信道信息可采用不同精度的量化方式,特别是低精度的量化方式。比如:矩阵W的一个元素的幅度值为0.1855,按照2bit量化后值为0.25,按照4bit量化后值为0.1875。4bit量化的量化精度比2bit的量化精度高。
2、生成方式
参考图5,第一设备101可针对整个系统频带生成第二信道信息,即进行宽带反馈,在全带宽上测得矩阵W的幅度信息并给予反馈。
3、反馈周期
第一设备101可以较长的周期反馈第二信道信息。这样,可有效控制第二信道信息在单位时间内的信息量,减少第二信道信息的开销。
仍以LTE系统为例,若第一设备101为UE,第二设备102为基站,UE向基站发送第二信道信息的周期可不小于目前LTE系统中的PMI的反馈周期。比如:目前FDD LTE系统中PMI反馈周期为5毫秒(ms),那么本申请的实施例中,第一设备101反馈第二信道信息的周期可以是5ms、10ms等。
综上,第一设备101在生成和反馈第二信道信息时,可针对整个系统频带生成第二信道信息,采用低精度量化的数字方式进行反馈,并且以较长的反馈周期反馈。这样可尽量降低第二信道信息的开销,提高系统性能。
此外,还有一种方式是,第一设备101不发送第二信道信息,仅向第二设备102发送第一信道信息。即在上述步骤S304中,第一设备101不生成第二信道信息,在步骤S305中,第一设备101也不发送第二信道信息。
第二设备102在收到第一信道信息后,可按照预设的幅度值作为预编码矩阵的每一个元素的幅度值来生成预编码矩阵,或者第二设备102也可根据 秩的值、发送天线端口数等信息确定幅度值,再将确定的幅度值作为预编码矩阵的每一个元素的幅度值来生成预编码矩阵。由于具备了第一信道信息,且第一信道信息的反馈精度较高,则可保证第二设备102获得的第一信道信息的精度,进而获得较精确的预编码矩阵,按照较精确的预编码矩阵进行数据发送,可获得较好的链路自适应的效果,提高系统性能。
当然,若第一设备101生成并向第二设备102反馈第二信道信息,这样第二设备102获得的信道信息就会更精确,还原的预编码矩阵也更精确,能获得更好的链路自适应的效果。
下面,对图3所示的流程中的根据信道矩阵H得到预编码矩阵的方式予以举例说明。这里,比如:对信道矩阵H进行SVD分解得到预编码矩阵。可采用的分解方式不限于SVD分解方式,只要能够由信道矩阵H获取预编码矩阵均可。可替换地,上述矩阵H也可为信道矩阵的协方差矩阵,只要是能够表征信道特性的矩阵均可。
其中,第一设备101可按下述公式3对信道矩阵H进行特征值分解,得到信道矩阵H的特征向量:
Figure PCTCN2016092522-appb-000012
其中
Figure PCTCN2016092522-appb-000013
为对角阵,V为由信道矩阵H的特征向量组成的矩阵,根据
Figure PCTCN2016092522-appb-000014
可以得到信道矩阵H的秩(Rank),以及SNR,通过V可以得到信道的预编码矩阵W,矩阵W的列数可等于信道矩阵H的秩。
图6示出了本申请的实施例提供的第二种信道信息上报方案的流程。如图6所示,该流程包括如下步骤:
S601:第二设备102向第一设备101发送参考信号,该参考信号用于对第二设备102到第一设备101的信道进行信道估计。
步骤S601可参考步骤S301。
S602:第一设备101根据参考信号进行信道估计,得到预编码矩阵,这里记为W。
其中,可参考步骤S302、步骤S303,即第二设备102根据参考信息进行 信道估计得到信道矩阵H,再对信道矩阵H进行分解,得到预编码矩阵。
或者,第一设备101也可以采用目前LTE系统中的方法,根据参考信号进行信道估计时,得到预编码矩阵。
其中,预编码矩阵W是Nt行R列的矩阵,且
Figure PCTCN2016092522-appb-000015
X是Nt/2行M列的矩阵,且X=[b0,b1,…,bM-1],bi是维度为Nt/2的列向量,0≤i≤M-1,Nt为所述第二设备的发送所述参考信号的天线端口数;W2为2M行R列的矩阵,
Figure PCTCN2016092522-appb-000016
其中,
Figure PCTCN2016092522-appb-000017
是维度为M的单位向量,只有第km个元素的值为1,其他元素的值均为0,且0≤m≤R-1,φn是模为1的复数,0≤n≤R-1;M、R、Nt均为正整数,且Nt为偶数。其中bi可以为信道矩阵的特征向量,也可以是DFT向量。
S603:第一设备101生成用于描述预编码矩阵W的第三信道信息、第四信道信息和第五信道信息,其中:
第三信道信息用于指示X;
第四信道信息用于指示
Figure PCTCN2016092522-appb-000018
第五信道信息用于指示φ0,…,φn,…,φR-1
其中,第三信道信息的精度比第五信道信息的精度低。
S604:第一设备101将生成的第三信道信息、第四信道信息和第五信道信息发送给第二设备102。
第一设备101将第三信道信息、第四信道信息和第五信道信息中的一个或多个信息直接承载于ZC序列上发送给第二设备102,而不经过编码、调制的过程。比如:第一设备101可将第三信道信息、第四信道信息以及第五信道信息中的未经过量化的信息信息直接承载于ZC序列上发送给第二设备 102。由于ZC序列的自相关特性和互相关特性较好,第二设备102在从ZC序列上获取信道信息时,可获得较好的信号解调性能,提高信道信息获取的准确性。
ZC序列仅为一种示例,第三信道信息、第四信道信息和第五信道信息也可承载于其他序列上发送,只要第二设备102能够获取信道信息即可。
承载于ZC序列等序列上的方式实际上采用的是物理层的发送方式,实际上,信道信息也可采用媒体接入控制(Medium Access Control,MAC)信令、或高层信令,比如(Radio Resource Control,RRC)信令传送等。
S605:第二设备102根据收到的第三信道信息、第四信道信息和第五信道信息生成预编码矩阵,并根据生成的预编码矩阵确定向第一设备101进行数据发送时使用的发送方式;其中,第二设备102根据生成的预编码矩阵,确定数据发送方式的方法,可参考目前的基站根据经过量化的预编码矩阵确定数据发送方式的方法。
S606:第二设备102采用确定的发送方式向第一设备101进行数据发送。
其中,第三信道信息、第四信道信息和第五信道信息用于第二设备102确定预编码矩阵,预编码矩阵是第一设备101根据第二设备102发送的参考信号进行信道估计得到的。
可选地,X中的列向量可以为离散傅里叶变换(Discrete Fourier Transform,DFT)向量,或者是由信道矩阵分解得到的未经过量化或者经过量化的列向量。
比如:参考下面的公式4,预编码矩阵W由W1,W2两个码本构成,即:
W=W1×W2           公式4
其中,
Figure PCTCN2016092522-appb-000019
其中b0,b1,…,bM-1是前述的X包括的M个向量的一个例子,可选地,它们是由信道矩阵H经过SVD分解得到的列向量,是经过长期统计得到的,且未经过量化。
其中,向量bi是一个长为第二设备102(比如:基站)的发送天线的端口数的列向量。其中M的值可以是一个预设的值或者是由第二设备102预先配置的一个值。
比如:第一设备101反馈信道信息的周期为20ms,信道测量的周期是5ms,信道矩阵H是4X4的矩阵,那么20ms内共统计了16个列向量。可以预设M=4,或者由第二设备102预先配置为2、4、8等值。
对于信道矩阵的秩等于1的情况,有:
Figure PCTCN2016092522-appb-000020
对于信道矩阵的秩等于2的情况,有:
Figure PCTCN2016092522-appb-000021
其中,W1表示M个列向量组成的集合,W2表示beam所在的具体方向,且W2包含列选择信息
Figure PCTCN2016092522-appb-000022
和联合相位(co-phasing)φn的信息。
Co-phasing信息φn第二设备102的发送天线的两个极化方向的相位差,取值范围是0到2π任意一个数,第一设备101在向第二设备102发送时,可不对该信息进行量化,采用模拟量的方式进行反馈。其中,Co-phasing信息为第五信道信息的例子。
对于信道矩阵的秩取其他值的情形,可按照公式5和公式6类推。若秩等于m(m为正整数),则W2中就有m个列向量。
其中,步骤S603中,第一设备101在生成第三信道信息时,可针对整个系统频带获得第三信道信息,具体可参考图7。比如:如前所述,整个系统频带被分为10个子频带:子频带1~子频带10,第一设备101针对整个系统频带生成第三信道信息。
第一设备101在生成第四信道信息时,可针对整个系统频带中的每一个子频带生成第四信道信息。
第一设备101在生成第五信道信息时,可针对整个系统频带中的每一个子频带生成第五信道信息。
可选地,第三信道信息、第四信道信息和第五信道信息可均按周期反馈,且第五信道信息的反馈周期比第三信道信息的反馈周期小。
经大量的仿真和实验发现,矩阵W中,W2对于还原信道矩阵是较关键的,W1相对于W2不是那么重要。因此,第一设备101在反馈信道信息时,第五信道信息的精度比第三信道信息的精度高。比如:可综合量化、反馈周期、针对子频带反馈还是整个系统带宽反馈等多种方式实现第五信道信息的精度比第三信道信息的精度高。这样,既能保证信道信息的反馈精度,又能够有效降低表征信道信息的反馈量。
下面对各信道信息的生成和发送方式进行具体描述。
一、第三信道信息的生成和反馈方式
1、量化方式
方式一、不对第三信道信息进行量化,直接反馈模拟量。
方式二、对第三信道信息量化的量化位数小于对第五信道信息量化的量化位数。
2、生成方式
如前所述,第一设备101在生成第三信道信息时,可针对整个系统频带生成第三信道信息。
3、反馈周期
第一设备101可以较长的周期发送第三信道信息,以较短的周期发送第五信道信息。通过合理设置第三信道信息的反馈周期,可有效降低第三信道信息的信息量。
仍以LTE系统为例,若第一设备101为UE,第二设备102为基站,UE向基站发送第三信道信息的周期可不小于目前LTE系统中的PMI的反馈周 期。比如:目前FDD LTE系统中PMI反馈周期为5ms,那么本申请的实施例中,第一设备101反馈第三信道信息的周期可以是5ms、10ms等。
以公式4所示的双码本结构为例,参考图8,第一设备101可将W1中的有效信息ai调制到ZC序列上发送给第二设备102。其中,带斜线部分对应的信号为参考信号。图中,IFFT表示快速傅里叶逆变换(Inverse Fast Fourier Transform)。
综上,第一设备101在生成和反馈第三信道信息时,可针对整个系统频带生成第三信道信息,采用低精度量化的数字方式进行反馈,并且以较长的反馈周期反馈。这样可有效降低第三信道信息的信息量。
二、第四信道信息的生成和反馈方式
1、量化方式
对第四信道信息采用数字方式进行反馈。
2、生成方式
如前所述,第一设备101在生成第四信道信息时,可针对系统频带中的每一个子频带分别生成第四信道信息,具体可参考图9。
3、反馈周期
第一设备101可以较短的周期发送第四信道信息。通过合理设置第四信道信息反馈周期,使得第二设备102能够获得较密集的第四信道信息,从而生成较精确的预编码矩阵。
仍以LTE系统为例,若第一设备101为UE,第一设备101为基站,UE向基站发送第四信道信息的周期可不大于目前LTE系统中的PMI的反馈周期。比如:目前FDD LTE系统中PMI反馈周期为5ms,那么本申请的实施例中,第一设备101反馈第四信道信息的周期可以是2ms等。
综上,第一设备101在生成和反馈第四信道信息时,可针对系统频带中的每一个子频带分别生成第四信道信息,采用数字方式进行反馈,并且以较短的反馈周期反馈。这样可有效提高第四信道信息的反馈精度,以便第二设备102能够生成较精确的预编码矩阵。
二、第五信道信息的生成和反馈方式
1、量化方式
对于第五信道信息,可采用如下量化方式之一:
方式一、不对第五信道信息进行量化,直接反馈模拟量。
方式二、对第五信道信息采用高精度的量化方式。
通过设置第五信道信息量化位数,可有效控制第五信道信息的量化精度,可保证第二设备102获得的第五信道信息的精度,进而获得较精确的预编码矩阵,按照较精确的预编码矩阵进行数据发送,可获得较好的链路自适应的效果,提高系统性能。
2、生成方式
如前所述,第一设备101在生成第五信道信息时,可针对系统频带中的每一个子频带分别生成第五信道信息,具体可参考图10。
3、反馈周期
第一设备101可以较短的周期发送第五信道信息。通过合理设置第五信道信息反馈周期,使得第二设备102能够获得较密集的第五信道信息,从而生成较精确的预编码矩阵。
仍以LTE系统为例,若第一设备101为UE,第二设备102为基站,UE向基站发送第五信道信息的周期可不大于目前LTE系统中的PMI的反馈周期。比如:目前FDD LTE系统中PMI反馈周期为5ms,那么本申请的实施例中,第一设备101反馈第五信道信息的周期可以是2ms等。
综上,第一设备101在生成和反馈第五信道信息时,可针对系统频带中的每一个子频带分别生成第五信道信息,采用非量化的模拟方式,或高精度量化的数字方式进行反馈,并且以较短的反馈周期反馈。这样可有效提高第五信道信息的反馈精度,以便第二设备102能够生成较精确的预编码矩阵。
此外,上述第一设备101发送第三信道信息的周期不小于发送第四信道信息的周期,也不小于发送第五信道信息的周期。
若第三信道信息和第五信道信息均在量化后反馈,则对第三信道信息进 行量化的量化位数不大于对第五信道信息进行量化的量化位数。
图11为本申请的实施例提供的第一种第一设备的结构示意图。如图11所示,该第一设备包括:接收模块1101、处理模块1102和发送模块1103。
在第一种可选的实现方式中:
接收模块1101,用于接收来自第二设备的参考信号;
处理模块1102,用于根据接收模块1101接收到的参考信号得到预编码矩阵,以及生成用于指示预编码矩阵的第一信道信息和第二信道信息;
发送模块1103,用于向第二设备发送第一信道信息和第二信道信息;
其中,第一信道信息的精度比第二信道信息的精度高;
第一信道信息包括预编码矩阵的每一个元素的相位信息,第二信道信息包括预编码矩阵的每一个元素的幅度信息。
其中,该装置的其他可选实现方式可参考前述的第一设备101在生成和反馈前述的第一信道信息和第二信道信息时的实现,其中,接收模块1101可用于实现第一设备101的接收操作,比如:接收参考信号、数据和控制信息等;处理模块1102可用于实现第一设备101的处理操作,比如:根据参考信号进行信道估计,生成信道信息等;发送模块1103可用于实现第一设备101的发送操作,比如:发送信道信息、数据和控制信息等。
在第二种可选的实现方式中:
接收模块1101,用于接收来自第二设备的参考信号;
处理模块1102,用于根据接收模块1101接收到的参考信号得到预编码矩阵W;
其中,W是Nt行R列的矩阵,且
Figure PCTCN2016092522-appb-000023
X是Nt/2行M列的矩阵,且X=[b0,b1,…,bM-1],bi是维度为Nt/2的列向量,0≤i≤M-1,Nt为第二设备的发送参考信号的天线端口数;W2为2M行R列的矩 阵,
Figure PCTCN2016092522-appb-000024
其中,
Figure PCTCN2016092522-appb-000025
是维度为M的单位向量,只有第km个元素的值为1,其他元素的值均为0,且0≤m≤R-1,φn是模为1的复数,0≤n≤R-1;M、R、Nt均为正整数,且Nt为偶数;
处理模块1102,还用于生成第三信道信息、第四信道信息和第五信道信息:
第三信道信息用于指示X;
第四信道信息用于指示
Figure PCTCN2016092522-appb-000026
第五信道信息用于指示φ0,…,φn,…,φR-1
其中,第三信道信息的精度比第五信道信息的精度低;
发送模块1103,用于向第二设备发送第三信道信息、第四信道信息和第五信道信息。
其中,该装置的其他可选实现方式可参考前述的第一设备101在生成和反馈前述的第三信道信息、第四信道信息和第五信道信息时的实现,其中,接收模块1101可用于实现第一设备101的接收操作,比如:接收参考信号、数据和控制信息等;处理模块1102可用于实现第一设备101的处理操作,比如:根据参考信号进行信道估计,生成信道信息等;发送模块1103可用于实现第一设备101的发送操作,比如:发送信道信息、数据和控制信息等。
图12为本申请的实施例提供的第二种第一设备的结构示意图。如图12所示,该第一设备包括:接收器1201、处理器1202和发送器1203。
在第一种可选的实现方式中:
接收器1201,用于接收来自第二设备的参考信号;
处理器1202,用于根据接收器1201接收到的参考信号得到预编码矩阵,以及生成用于指示预编码矩阵的第一信道信息和第二信道信息;
发送器1203,用于向第二设备发送第一信道信息和第二信道信息;
其中,第一信道信息的精度比第二信道信息的精度高;
第一信道信息包括预编码矩阵的每一个元素的相位信息,第二信道信息包括预编码矩阵的每一个元素的幅度信息。
其中,该装置的其他可选实现方式可参考前述的第一设备101在生成和反馈前述的第一信道信息和第二信道信息时的实现,其中,接收器1201可用于实现第一设备101的接收操作,比如:接收参考信号、数据和控制信息等;处理器1202可用于实现第一设备101的处理操作,比如:根据参考信号进行信道估计,生成信道信息等;发送器1203可用于实现第一设备101的发送操作,比如:发送信道信息、数据和控制信息等。
在第二种可选的实现方式中:
接收器1201,用于接收来自第二设备的参考信号;
处理器1202,用于根据接收器1201接收到的参考信号得到预编码矩阵W;
其中,W是Nt行R列的矩阵,且
Figure PCTCN2016092522-appb-000027
X是Nt/2行M列的矩阵,且X=[b0,b1,…,bM-1],bi是维度为Nt/2的列向量,0≤i≤M-1,Nt为第二设备的发送参考信号的天线端口数;W2为2M行R列的矩阵,
Figure PCTCN2016092522-appb-000028
其中,
Figure PCTCN2016092522-appb-000029
是维度为M的单位向量,只有第km个元素的值为1,其他元素的值均为0,且0≤m≤R-1,φn是模为1的复数,0≤n≤R-1;M、R、Nt均为正整数,且Nt为偶数;
处理器1202,还用于生成第三信道信息、第四信道信息和第五信道信息:
第三信道信息用于指示X;
第四信道信息用于指示
Figure PCTCN2016092522-appb-000030
第五信道信息用于指示φ0,…,φn,…,φR-1
其中,第三信道信息的精度比第五信道信息的精度低;
发送器1203,用于向第二设备发送第三信道信息、第四信道信息和第五信道信息。
其中,该装置的其他可选实现方式可参考前述的第一设备101在生成和反馈前述的第三信道信息、第四信道信息和第五信道信息时的实现,其中,接收器1201可用于实现第一设备101的接收操作,比如:接收参考信号、数据和控制信息等;处理器1202可用于实现第一设备101的处理操作,比如:根据参考信号进行信道估计,生成信道信息等;发送器1203可用于实现第一设备101的发送操作,比如:发送信道信息、数据和控制信息等。
图13为本申请的实施例提供的第一种第二设备的结构示意图。如图13所示,该第二设备包括:接收模块1301、处理模块1302和发送模块1303。
在第一种可选的实现方式中:
发送模块1303,用于向第一设备发送参考信号;
接收模块1301,用于接收来自第一设备的第一信道信息和第二信道信息;其中,第一信道信息和第二信道信息用于指示预编码矩阵,预编码矩阵是第一设备基于接收到的参考信号得到的;
其中,第一信道信息的精度比第二信道信息的精度高;
第一信道信息包括预编码矩阵的每一个元素的相位信息,第二信道信息包括预编码矩阵的每一个元素的幅度信息;
处理模块1302,用于根据第一信道信息和第二信息确定预编码矩阵;
发送模块1303,还用于按照处理模块1302确定的预编码矩阵向第一设备发送数据。
其中,该装置的其他可选实现方式可参考前述的第二设备102在接收第一信道信息和第二信道信息时的实现,其中,接收模块1301可用于实现第二 设备102的接收操作,比如:接收信道信息、数据和其他控制信息等;处理模块1302可用于实现第二设备102的处理操作,比如:根据信道信息生成预编码矩阵,根据生成的预编码矩阵确定数据发送方式等;发送模块1303可用于实现第二设备102的发送操作,比如:发送参考信号、数据和控制信息等。
在第二种可选的实现方式中:
发送模块1303,用于向第一设备发送参考信号;
接收模块1301,用于接收来自第一设备的第三信道信息、第四信道信息和第五信道信息;其中,第三信道信息的精度比第五信道信息的精度低;
处理模块1302,用于根据第三信道信息、第四信道信息和第五信道信息确定预编码矩阵W;
发送模块1303,用于按照处理模块1302确定的预编码矩阵W向第一设备发送数据;
其中,预编码矩阵W是第一设备根据接收到的参考信号得到的;W是Nt行R列的矩阵,且
Figure PCTCN2016092522-appb-000031
X是Nt/2行M列的矩阵,且X=[b0,b1,…,bM-1],bi是维度为Nt/2的列向量,0≤i≤M-1,Nt为第二设备的发送参考信号的天线端口数;W2为2M行R列的矩阵,
Figure PCTCN2016092522-appb-000032
其中,
Figure PCTCN2016092522-appb-000033
是维度为M的单位向量,只有第km个元素的值为1,其他元素的值均为0,且0≤m≤R-1,φn是模为1的复数,0≤n≤R-1;M、R、Nt均为正整数,且Nt为偶数;
第三信道信息用于指示X;
第四信道信息用于指示
Figure PCTCN2016092522-appb-000034
第五信道信息用于指示φ0,…,φn,…,φR-1
其中,该装置的其他可选实现方式可参考前述的第二设备102在接收第三信道信息、第四信道信息和第五信道信息时的实现,其中,接收模块1301可用于实现第二设备102的接收操作,比如:接收信道信息、数据和其他控制信息等;处理模块1302可用于实现第二设备102的处理操作,比如:根据信道信息生成预编码矩阵,根据生成的预编码矩阵确定数据发送方式等;发送模块1303可用于实现第二设备102的发送操作,比如:发送参考信号、数据和控制信息等。
图14为本申请的实施例提供的第二种第二设备的结构示意图。如图14所示,该第二设备包括:接收器1401、处理器1402和发送器1403。
在第一种可选的实现方式中:
发送器1403,用于向第一设备发送参考信号;
接收器1401,用于接收来自第一设备的第一信道信息和第二信道信息;其中,第一信道信息和第二信道信息用于指示预编码矩阵,预编码矩阵是第一设备基于接收到的参考信号得到的;
其中,第一信道信息的精度比第二信道信息的精度高;
第一信道信息包括预编码矩阵的每一个元素的相位信息,第二信道信息包括预编码矩阵的每一个元素的幅度信息;
处理器1402,用于根据第一信道信息和第二信息确定预编码矩阵;
发送器1403,还用于按照处理器1402确定的预编码矩阵向第一设备发送数据。
其中,该装置的其他可选实现方式可参考前述的第二设备102在接收第一信道信息和第二信道信息时的实现,其中,接收器1401可用于实现第二设备102的接收操作,比如:接收信道信息、数据和其他控制信息等;处理器1402可用于实现第二设备102的处理操作,比如:根据信道信息生成预编码矩阵,根据生成的预编码矩阵确定数据发送方式等;发送器1403可用于实现第二设备102的发送操作,比如:发送参考信号、数据和控制信息等。
在第二种可选的实现方式中:
发送器1403,用于向第一设备发送参考信号;
接收器1401,用于接收来自第一设备的第三信道信息、第四信道信息和第五信道信息;其中,第三信道信息的精度比第五信道信息的精度低;
处理器1402,用于根据第三信道信息、第四信道信息和第五信道信息确定预编码矩阵W;
发送器1403,用于按照处理器1402确定的预编码矩阵W向第一设备发送数据;
其中,预编码矩阵W是第一设备根据接收到的参考信号得到的;W是Nt行R列的矩阵,且
Figure PCTCN2016092522-appb-000035
X是Nt/2行M列的矩阵,且X=[b0,b1,…,bM-1],bi是维度为Nt/2的列向量,0≤i≤M-1,Nt为第二设备的发送参考信号的天线端口数;W2为2M行R列的矩阵,
Figure PCTCN2016092522-appb-000036
其中,
Figure PCTCN2016092522-appb-000037
是维度为M的单位向量,只有第km个元素的值为1,其他元素的值均为0,且0≤m≤R-1,φn是模为1的复数,0≤n≤R-1;M、R、Nt均为正整数,且Nt为偶数;
第三信道信息用于指示X;
第四信道信息用于指示
Figure PCTCN2016092522-appb-000038
第五信道信息用于指示φ0,…,φn,…,φR-1
其中,该装置的其他可选实现方式可参考前述的第二设备102在接收第三信道信息、第四信道信息和第五信道信息时的实现,其中,接收器1401可用于实现第二设备102的接收操作,比如:接收信道信息、数据和其他控制信息等;处理器1402可用于实现第二设备102的处理操作,比如:根据信道信息生成预编码矩阵,根据生成的预编码矩阵确定数据发送方式等;发送器 1403可用于实现第二设备102的发送操作,比如:发送参考信号、数据和控制信息等。
综上,本申请的实施例提供一种信道信息的传输装置、方法和系统,在反馈信道信息中对于还原信道矩阵比较关键、精度要求高的信息时,采用的反馈精度较高。对于还原信道矩阵不太关键、精度要求不高的信息,采用较低的反馈精度进行反馈。这样在保证信道信息精确的同时,有效减小了系统开销,提高了系统性能。
本领域内的技术人员应明白,本申请的实施例可提供为方法、系统、或计算机程序产品。因此,本申请可采用完全硬件实施例、完全软件实施例、或结合软件和硬件方面的实施例的形式。而且,本申请可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器、CD-ROM、光学存储器等)上实施的计算机程序产品的形式。
本申请是参照根据本申请的实施例的方法、设备(系统)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器,使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中,使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品,该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上,使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理,从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图 一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
尽管已描述了本申请的优选实施例,但本领域内的技术人员一旦得知了基本创造性概念,则可对这些实施例做出另外的变更和修改。所以,所附权利要求意欲解释为包括优选实施例以及落入本申请范围的所有变更和修改。
显然,本领域的技术人员可以对本申请的实施例进行各种改动和变型而不脱离本申请的实施例的精神和范围。这样,倘若本申请的实施例的这些修改和变型属于本申请权利要求及其等同技术的范围之内,则本申请也意图包含这些改动和变型在内。

Claims (46)

  1. 一种第一设备,其特征在于,包括:
    接收模块,用于接收来自第二设备的参考信号;
    处理模块,用于根据所述接收模块接收到的所述参考信号得到预编码矩阵,以及生成用于指示所述预编码矩阵的第一信道信息和第二信道信息;
    发送模块,用于向所述第二设备发送所述第一信道信息和所述第二信道信息;
    其中,所述第一信道信息的精度比所述第二信道信息的精度高;
    所述第一信道信息包括预编码矩阵的每一个元素的相位信息,所述第二信道信息包括所述预编码矩阵的每一个元素的幅度信息。
  2. 如权利要求1所述的设备,其特征在于,所述处理模块,具体用于:生成未经过量化的所述第一信道信息,以及经过量化后的所述第二信道信息。
  3. 如权利要求1所述的设备,其特征在于,所述处理模块,具体用于:
    生成经过量化后的所述第一信道信息和经过量化后的所述第二信道信息,且所述第一信道信息的量化位数大于所述第二信道信息的量化位数。
  4. 如权利要求1所述的设备,其特征在于,所述处理模块,具体用于:生成包括K组第一信道子信息的所述第一信道信息;
    其中,所述K为正整数,是所述预编码矩阵包含的列向量的个数;
    每一个列向量对应一组第一信道子信息;
    所述第一信道子信息包括:
    第一信道基本子信息,为所述第一信道子信息对应的列向量中的参考元素的相位信息,所述参考元素的相位不为零;
    L-2个第一信道相对子信息,其中,L为所述列向量的长度,一个所述第一信道相对子信息对应于所述列向量中除了所述参考元素之外的一个相位非零的元素,用于表示对应元素的相位与所述参考元素相位的偏差;
    所述第一信道基本子信息是未经过量化的信道信息,所述第一信道相对子信息是经过量化后的信道信息。
  5. 如权利要求4所述的设备,其特征在于,所述处理模块,具体用于:
    生成经过量化后的所述第二信道信息,且每一个第一信道相对子信息的量化位数均大于所述第二信道信息的量化位数。
  6. 如权利要求1~5任一项所述的设备,其特征在于,所述处理模块,具体用于:
    针对系统频带中的每一个预设的子频带分别生成所述第一信道信息,并针对整个系统带宽生成所述第二信道信息。
  7. 如权利要求1~6任一项所述的设备,其特征在于,所述处理模块,具体用于:
    指示所述发送模块在发送所述第一信道信息和所述第二信道信息时,所述第一信道信息的发送周期比所述第二信道信息的发送周期小。
  8. 一种第二设备,其特征在于,包括:
    发送模块,用于向第一设备发送参考信号;
    接收模块,用于接收来自所述第一设备的第一信道信息和第二信道信息;其中,所述第一信道信息和所述第二信道信息用于指示预编码矩阵,所述预编码矩阵是所述第一设备基于接收到的所述参考信号得到的;
    其中,所述第一信道信息的精度比所述第二信道信息的精度高;
    所述第一信道信息包括预编码矩阵的每一个元素的相位信息,所述第二信道信息包括所述预编码矩阵的每一个元素的幅度信息;
    处理模块,用于根据所述第一信道信息和所述第二信息确定所述预编码矩阵;
    所述发送模块,还用于按照所述处理模块确定的所述预编码矩阵向所述第一设备发送数据。
  9. 如权利要求8所述的设备,其特征在于,所述接收模块,具体用于:
    接收未经过量化的所述第一信道信息,以及接收经过量化后的所述第二 信道信息。
  10. 如权利要求8所述的设备,其特征在于,所述接收模块,具体用于:
    接收经过量化后的所述第一信道信息和经过量化后的所述第二信道信息,且所述第一信道信息的量化位数大于所述第二信道信息的量化位数。
  11. 如权利要求8所述的设备,其特征在于,所述接收模块,具体用于:
    接收包括K组第一信道子信息的所述第一信道信息;所述K为正整数,是所述预编码矩阵包含的列向量的个数;每一个列向量对应一组第一信道子信息;
    所述第一信道子信息包括:
    第一信道基本子信息,为所述第一信道子信息对应的列向量中的参考元素的相位信息,所述参考元素的相位不为零;
    L-2个第一信道相对子信息,其中,L为所述列向量的长度,一个所述第一信道相对子信息对应于所述列向量中除了所述参考元素之外的一个相位非零的元素,用于表示对应元素的相位与所述参考元素相位的偏差;
    所述第一信道基本子信息是未经过量化的信道信息,所述第一信道相对子信息是经过量化后的信道信息。
  12. 如权利要求11所述的设备,其特征在于,所述接收模块,具体用于:
    接收经过量化后的所述第二信道信息,且每一个第一信道相对子信息的量化位数均大于所述第二信道信息的量化位数。
  13. 如权利要求8~12任一项所述的设备,其特征在于,所述接收模块,具体用于:
    接收针对系统频带中的每一个预设的子频带的所述第一信道信息,以及接收针对整个系统带宽的所述第二信道信息。
  14. 如权利要求8~13任一项所述的设备,其特征在于,所述接收模块,具体用于:
    接收按周期发送的所述第一信道信息和所述第二信息信息,且所述第一 信道信息的发送周期比所述第二信道信息的发送周期小。
  15. 一种信道信息的发送设备,其特征在于,包括:
    接收模块,用于接收来自第二设备的参考信号;
    处理模块,用于根据所述接收模块接收到的所述参考信号得到预编码矩阵W;
    其中,W是Nt行R列的矩阵,且
    Figure PCTCN2016092522-appb-100001
    X是Nt/2行M列的矩阵,且X=[b0,b1,…,bM-1],bi是维度为Nt/2的列向量,0≤i≤M-1,Nt为所述第二设备的发送所述参考信号的天线端口数;W2为2M行R列的矩阵,
    Figure PCTCN2016092522-appb-100002
    其中,
    Figure PCTCN2016092522-appb-100003
    是维度为M的单位向量,只有第km个元素的值为1,其他元素的值均为0,且0≤m≤R-1,φn是模为1的复数,0≤n≤R-1;M、R、Nt均为正整数,且Nt为偶数;
    所述处理模块,还用于生成第三信道信息、第四信道信息和第五信道信息:
    所述第三信道信息用于指示X;
    所述第四信道信息用于指示
    Figure PCTCN2016092522-appb-100004
    所述第五信道信息用于指示φ0,…,φn,…,φR-1
    其中,所述第三信道信息的精度比所述第五信道信息的精度低;
    发送模块,用于向所述第二设备发送所述第三信道信息、所述第四信道信息和所述第五信道信息。
  16. 如权利要求15所述的设备,其特征在于,所述处理模块,具体用于:
    生成经过量化后的所述第三信道信息,以及生成未经过量化的所述第五 信道信息;或者
    生成经过量化后的所述第三信道信息和经过量化后的所述第五信道信息,且所述第三信道信息所指示的每一个向量的量化位数比所述第五信道信息的量化位数少;或者
    生成经过量化后的所述第三信道信息和经过量化后的所述第五信道信息,且所述第三信道信息所指示的每一个向量的量化位数均比所述第五信道信息所指示的的任意一个φn的量化位数少;或者
    生成经过量化后的所述第三信道信息和经过量化后的所述第五信道信息,且所述第三信道信息所指示的任何一个向量的每一个元素的量化位数均比所述第五信道信息所指示的任意一个φn的量化位数少。
  17. 如权利要求15或16所述的设备,其特征在于,所述处理模块,具体用于:
    针对整个系统带宽生成所述第三信道信息,以及针对系统频带中的每一个预设的子频带分别生成所述第四信道信息和所述第五信道信息的。
  18. 如权利要求15~17任一项所述的设备,其特征在于,所述处理模块,具体用于:
    指示所述发送模块按周期发送所述第三信道信息、所述第四信道信息和所述第五信道信息,且所述第三信道信息的发送周期比所述第四信道信息的发送周期大,且所述第三信道信息的发送周期比所述第五信道信息的发送周期大。
  19. 一种第二设备,其特征在于,包括:
    发送模块,用于向第一设备发送参考信号;
    接收模块,用于接收来自所述第一设备的第三信道信息、第四信道信息和第五信道信息;其中,所述第三信道信息的精度比所述第五信道信息的精度低;
    处理模块,用于根据所述第三信道信息、所述第四信道信息和所述第五 信道信息确定预编码矩阵W;
    发送模块,用于按照所述处理模块确定的所述预编码矩阵W向所述第一设备发送数据;
    其中,所述预编码矩阵W是所述第一设备根据接收到的所述参考信号得到的;W是Nt行R列的矩阵,且
    Figure PCTCN2016092522-appb-100005
    X是Nt/2行M列的矩阵,且X=[b0,b1,…,bM-1],bi是维度为Nt/2的列向量,0≤i≤M-1,Nt为所述第二设备的发送所述参考信号的天线端口数;W2为2M行R列的矩阵,
    Figure PCTCN2016092522-appb-100006
    其中,
    Figure PCTCN2016092522-appb-100007
    是维度为M的单位向量,只有第km个元素的值为1,其他元素的值均为0,且0≤m≤R-1,φn是模为1的复数,0≤n≤R-1;M、R、Nt均为正整数,且Nt为偶数;
    所述第三信道信息用于指示X;
    所述第四信道信息用于指示
    Figure PCTCN2016092522-appb-100008
    所述第五信道信息用于指示φ0,…,φn,…,φR-1
  20. 如权利要求19所述的设备,其特征在于,所述接收模块,具体用于:
    接收经过量化后的所述第三信道信息,以及接收未经过量化的所述第五信道信息;或者
    接收经过量化后的所述第三信道信息和经过量化后的所述第五信道信息,且所述第三信道信息包括的每一个向量的量化位数比所述第五信道信息的量化位数少;或者
    接收经过量化后的所述第三信道信息和经过量化后的所述第五信道信息,且所述第三信道信息所指示的每一个向量的量化位数均比所述第五信道 信息所指示的的任意一个φn的量化位数少;或者
    接收经过量化后的所述第三信道信息和经过量化后的所述第五信道信息,且所述第三信道信息所指示的任何一个向量的每一个元素的量化位数均比所述第五信道信息所指示的任意一个φn的量化位数少。
  21. 如权利要求19或20所述的设备,其特征在于,所述接收模块,具体用于:
    接收针对整个系统带宽生成的所述第三信道信息,以及针对系统频带中的每一个预设的子频带生成的所述第四信道信息和所述第五信道信息。
  22. 如权利要求19~21任一项所述的设备,其特征在于,所述接收模块,具体用于:
    接收按周期发送的所述第三信道信息、所述第四信道信息和所述第五信道信息,且所述第三信道信息的发送周期比所述第四信道信息的发送周期大,且所述第三信道信息的发送周期比所述第五信道信息的发送周期大。
  23. 一种信道信息的发送方法,其特征在于,包括:
    第一设备接收来自第二设备的参考信号;
    所述第一设备根据接收到的所述参考信号得到预编码矩阵;
    所述第一设备生成用于指示所述预编码矩阵的第一信道信息和第二信道信息;
    所述第一设备向所述第二设备发送所述第一信道信息和所述第二信道信息;
    其中,所述第一信道信息的精度比所述第二信道信息的精度高;
    所述第一信道信息包括预编码矩阵的每一个元素的相位信息,所述第二信道信息包括所述预编码矩阵的每一个元素的幅度信息。
  24. 如权利要求23所述的方法,其特征在于,所述第一信道信息的精度比所述第二信道信息的精度高,包括:
    所述第一信道信息是未经过量化的信道信息,所述第二信道信息是经过 量化后的信道信息。
  25. 如权利要求23所述的方法,其特征在于,所述第一信道信息的精度比所述第二信道信息的精度高,包括:
    所述第一信道信息和所述第二信道信息均为经过量化后的信道信息,且所述第一信道信息的量化位数大于所述第二信道信息的量化位数。
  26. 如权利要求23所述的方法,其特征在于,
    所述第一信道信息包括:K组第一信道子信息;所述K为正整数,是所述预编码矩阵包含的列向量的个数;每一个列向量对应一组第一信道子信息;
    所述第一信道子信息包括:
    第一信道基本子信息,为所述第一信道子信息对应的列向量中的参考元素的相位信息,所述参考元素的相位不为零;
    L-2个第一信道相对子信息,其中,L为所述列向量的长度,一个所述第一信道相对子信息对应于所述列向量中除了所述参考元素之外的一个相位非零的元素,用于表示对应元素的相位与所述参考元素相位的偏差;
    所述第一信道基本子信息是未经过量化的信道信息,所述第一信道相对子信息是经过量化后的信道信息。
  27. 如权利要求26所述的方法,其特征在于,所述第一信道信息的精度比所述第二信道信息的精度高,包括:
    所述第二信道信息为经过量化后的信道信息,且每一个第一信道相对子信息的量化位数均大于所述第二信道信息的量化位数。
  28. 如权利要求23~27任一项所述的方法,其特征在于,所述第一信道信息的精度比所述第二信道信息的精度高,包括:
    所述第一设备是针对系统频带中的每一个预设的子频带分别生成所述第一信道信息,并针对整个系统带宽生成所述第二信道信息的。
  29. 如权利要求23~28任一项所述的方法,其特征在于,所述第一信道信息的精度比所述第二信道信息的精度高,包括:
    所述第一信道信息的发送周期比所述第二信道信息的发送周期小。
  30. 一种数据发送方法,其特征在于,包括:
    第二设备向第一设备发送参考信号;
    所述第二设备接收来自所述第一设备的第一信道信息和第二信道信息;其中,所述第一信道信息和所述第二信道信息用于指示预编码矩阵,所述预编码矩阵是所述第一设备基于接收到的所述参考信号得到的;
    其中,所述第一信道信息的精度比所述第二信道信息的精度高;
    所述第一信道信息包括预编码矩阵的每一个元素的相位信息,所述第二信道信息包括所述预编码矩阵的每一个元素的幅度信息;
    所述第二设备根据所述第一信道信息和所述第二信息确定所述预编码矩阵;
    所述第二设备按照确定的所述预编码矩阵向所述第一设备发送数据。
  31. 如权利要求30所述的方法,其特征在于,所述第一信道信息的精度比所述第二信道信息的精度高,包括:
    所述第一信道信息是未经过量化的信道信息,所述第二信道信息是经过量化后的信道信息。
  32. 如权利要求30所述的方法,其特征在于,所述第一信道信息的精度比所述第二信道信息的精度高,包括:
    所述第一信道信息和所述第二信道信息均为经过量化后的信道信息,且所述第一信道信息的量化位数大于所述第二信道信息的量化位数。
  33. 如权利要求30所述的方法,其特征在于,
    所述第一信道信息包括:K组第一信道子信息;所述K为正整数,是所述预编码矩阵包含的列向量的个数;每一个列向量对应一组第一信道子信息;
    所述第一信道子信息包括:
    第一信道基本子信息,为所述第一信道子信息对应的列向量中的参考元素的相位信息,所述参考元素的相位不为零;
    L-2个第一信道相对子信息,其中,L为所述列向量的长度,一个所 述第一信道相对子信息对应于所述列向量中除了所述参考元素之外的一个相位非零的元素,用于表示对应元素的相位与所述参考元素相位的偏差;
    所述第一信道基本子信息是未经过量化的信道信息,所述第一信道相对子信息是经过量化后的信道信息。
  34. 如权利要求33所述的方法,其特征在于,所述第一信道信息的精度比所述第二信道信息的精度高,包括:
    所述第二信道信息为经过量化后的信道信息,且每一个第一信道相对子信息的量化位数均大于所述第二信道信息的量化位数。
  35. 如权利要求30~34任一项所述的方法,其特征在于,所述第一信道信息的精度比所述第二信道信息的精度高,包括:
    所述第一信道信息是针对系统频带中的每一个预设的子频带的,且所述第二信道信息是针对整个系统带宽的。
  36. 如权利要求30~35任一项所述的方法,其特征在于,所述第一信道信息的精度比所述第二信道信息的精度高,包括:
    所述第一信道信息的发送周期比所述第二信道信息的发送周期小。
  37. 一种无线通信系统,包括第一设备和第二设备,其特征在于,
    所述第二设备,用于向所述第一设备发送参考信号;
    所述第一设备,用于根据接收到的所述参考信号得到预编码矩阵;并生成用于指示所述预编码矩阵的第一信道信息和第二信道信息;以及向所述第二设备发送所述第一信道信息和所述第二信道信息;
    所述第二设备,还用于根据接收到的所述第一信道信息和所述第二信道信息确定所述预编码矩阵;并按照确定的所述预编码矩阵向所述第一设备发送数据;
    其中,所述第一信道信息的精度比所述第二信道信息的精度高;
    所述第一信道信息包括预编码矩阵的每一个元素的相位信息,所述第二信道信息包括所述预编码矩阵的每一个元素的幅度信息。
  38. 一种信道信息的发送方法,其特征在于,包括:
    第一设备接收来自第二设备的参考信号;
    所述第一设备根据接收到的所述参考信号得到预编码矩阵W;
    其中,W是Nt行R列的矩阵,且
    Figure PCTCN2016092522-appb-100009
    X是Nt/2行M列的矩阵,且X=[b0,b1,…,bM-1],bi是维度为Nt/2的列向量,0≤i≤M-1,Nt为所述第二设备的发送所述参考信号的天线端口数;W2为2M行R列的矩阵,
    Figure PCTCN2016092522-appb-100010
    其中,
    Figure PCTCN2016092522-appb-100011
    是维度为M的单位向量,只有第km个元素的值为1,其他元素的值均为0,且0≤m≤R-1,φn是模为1的复数,0≤n≤R-1;M、R、Nt均为正整数,且Nt为偶数;
    所述第一设备生成第三信道信息、第四信道信息和第五信道信息:
    所述第三信道信息用于指示X;
    所述第四信道信息用于指示
    Figure PCTCN2016092522-appb-100012
    所述第五信道信息用于指示φ0,…,φn,…,φR-1
    其中,所述第三信道信息的精度比所述第五信道信息的精度低;
    所述第一设备向所述第二设备发送所述第三信道信息、所述第四信道信息和所述第五信道信息。
  39. 如权利要求38所述的方法,其特征在于,所述第三信道信息的精度比所述第五信道信息的精度低,包括:
    所述第三信道信息是经过量化后的信道信息,所述第五信道信息是未经过量化的信道信息;或者
    所述第三信道信息和所述第五信道信息均为经过量化后的信道信息,且所述第三信道信息所指示的每一个向量的量化位数比所述第五信道信息的量 化位数少;或者
    所述第三信道信息和所述第五信道信息均为经过量化后的信道信息,且所述第三信道信息所指示的每一个向量的量化位数均比所述第五信道信息所指示的的任意一个φn的量化位数少;或者
    所述第三信道信息和所述第五信道信息均为经过量化后的信道信息,且所述第三信道信息所指示的任何一个向量的每一个元素的量化位数均比所述第五信道信息所指示的任意一个φn的量化位数少。
  40. 如权利要求38或39所述的方法,其特征在于,所述第三信道信息的精度比所述第五信道信息的精度低,包括:
    所述第一设备是针对整个系统带宽生成所述第三信道信息,并针对系统频带中的每一个预设的子频带分别生成所述第四信道信息和所述第五信道信息的。
  41. 如权利要求38~40任一项所述的方法,其特征在于,所述第三信道信息的精度比所述第五信道信息的精度低,包括:
    所述第三信道信息的发送周期比所述第四信道信息的发送周期大,且所述第三信道信息的发送周期比所述第五信道信息的发送周期大。
  42. 一种数据发送方法,其特征在于,包括:
    第二设备向第一设备发送参考信号;
    所述第二设备接收来自所述第一设备的第三信道信息、第四信道信息和第五信道信息;其中,所述第三信道信息的精度比所述第五信道信息的精度低;
    所述第二设备根据所述第三信道信息、所述第四信道信息和所述第五信道信息确定预编码矩阵W;
    所述第二设备按照确定的所述预编码矩阵W向所述第一设备发送数据;
    其中,所述预编码矩阵W是所述第一设备根据接收到的所述参考信 号得到的;W是Nt行R列的矩阵,且
    Figure PCTCN2016092522-appb-100013
    X是Nt/2行M列的矩阵,且X=[b0,b1,…,bM-1],bi是维度为Nt/2的列向量,0≤i≤M-1,Nt为所述第二设备的发送所述参考信号的天线端口数;W2为2M行R列的矩阵,
    Figure PCTCN2016092522-appb-100014
    其中,
    Figure PCTCN2016092522-appb-100015
    是维度为M的单位向量,只有第km个元素的值为1,其他元素的值均为0,且0≤m≤R-1,φn是模为1的复数,0≤n≤R-1;M、R、Nt均为正整数,且Nt为偶数;
    所述第三信道信息用于指示X;
    所述第四信道信息用于指示
    Figure PCTCN2016092522-appb-100016
    所述第五信道信息用于指示φ0,…,φn,…,φR-1
  43. 如权利要求42所述的方法,其特征在于,所述第三信道信息的精度比所述第五信道信息的精度低,包括:
    所述第三信道信息是经过量化后的信道信息,所述第五信道信息是未经过量化的信道信息;或者
    所述第三信道信息和所述第五信道信息均为经过量化后的信道信息,且所述第三信道信息包括的每一个向量的量化位数比所述第五信道信息的量化位数少;或者
    所述第三信道信息和所述第五信道信息均为经过量化后的信道信息,且所述第三信道信息所指示的每一个向量的量化位数均比所述第五信道信息所指示的的任意一个φn的量化位数少;或者
    所述第三信道信息和所述第五信道信息均为经过量化后的信道信息,且所述第三信道信息所指示的任何一个向量的每一个元素的量化位数均比所述 第五信道信息所指示的任意一个φn的量化位数少。
  44. 如权利要求42或43所述的方法,其特征在于,所述第三信道信息的精度比所述第五信道信息的精度低,包括:
    所述第三信道信息是针对整个系统带宽生成的,所述第四信道信息和所述第五信道信息是针对系统频带中的每一个预设的子频带分别生成的。
  45. 如权利要求42~44任一项所述的方法,其特征在于,所述第三信道信息的精度比所述第五信道信息的精度低,包括:
    所述第三信道信息的发送周期比所述第四信道信息的发送周期大,且所述第三信道信息的发送周期比所述第五信道信息的发送周期大。
  46. 一种无线通信系统,包括第一设备和第二设备,其特征在于,
    所述第二设备,用于向所述第一设备发送参考信号;
    所述第一设备,用于根据接收到的所述参考信号得到预编码矩阵W;
    其中,W是Nt行R列的矩阵,且
    Figure PCTCN2016092522-appb-100017
    X是Nt/2行M列的矩阵,且X=[b0,b1,…,bM-1],bi是维度为Nt/2的列向量,0≤i≤M-1,Nt为所述第二设备的发送所述参考信号的天线端口数;W2为2M行R列的矩阵,
    Figure PCTCN2016092522-appb-100018
    其中,
    Figure PCTCN2016092522-appb-100019
    是维度为M的单位向量,只有第km个元素的值为1,其他元素的值均为0,且0≤m≤R-1,φn是模为1的复数,0≤n≤R-1;M、R、Nt均为正整数,且Nt为偶数;
    所述第一设备,还用于生成第三信道信息、第四信道信息和第五信道信息:
    所述第三信道信息用于指示X;
    所述第四信道信息用于指示
    Figure PCTCN2016092522-appb-100020
    所述第五信道信息用于指示φ0,…,φn,…,φR-1
    其中,所述第三信道信息的精度比所述第五信道信息的精度低;
    所述第一设备,还用于向所述第二设备发送所述第三信道信息、所述第四信道信息和所述第五信道信息;
    所述第二设备,还用于根据接收到的所述第三信道信息、所述第四信道信息和所述第五信道信息确定所述预编码矩阵W;以及按照确定的所述预编码矩阵W向所述第一设备发送数据。
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