WO2009021407A1 - A method and device for modulating the information of tfci - Google Patents

A method and device for modulating the information of tfci Download PDF

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Publication number
WO2009021407A1
WO2009021407A1 PCT/CN2008/001463 CN2008001463W WO2009021407A1 WO 2009021407 A1 WO2009021407 A1 WO 2009021407A1 CN 2008001463 W CN2008001463 W CN 2008001463W WO 2009021407 A1 WO2009021407 A1 WO 2009021407A1
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WO
WIPO (PCT)
Prior art keywords
tfci information
power point
point
tfci
constellation
Prior art date
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Ceased
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PCT/CN2008/001463
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English (en)
French (fr)
Inventor
Yu Ding
Xiaodong Yang
Xunwei Zhao
Shiyan Ren
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Datang Mobile Communications Equipment Co Ltd
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Datang Mobile Communications Equipment Co Ltd
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Filing date
Publication date
Application filed by Datang Mobile Communications Equipment Co Ltd filed Critical Datang Mobile Communications Equipment Co Ltd
Priority to JP2010520404A priority Critical patent/JP4980467B2/ja
Priority to US12/673,490 priority patent/US8611461B2/en
Priority to EP08783645.8A priority patent/EP2180650B1/en
Priority to KR1020107005494A priority patent/KR101166539B1/ko
Publication of WO2009021407A1 publication Critical patent/WO2009021407A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/32Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/0001Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0025Transmission of mode-switching indication
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/0078Avoidance of errors by organising the transmitted data in a format specifically designed to deal with errors, e.g. location
    • H04L1/0079Formats for control data
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/32Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/3405Modifications of the signal space to increase the efficiency of transmission, e.g. reduction of the bit error rate, bandwidth, or average power
    • H04L27/3411Modifications of the signal space to increase the efficiency of transmission, e.g. reduction of the bit error rate, bandwidth, or average power reducing the peak to average power ratio or the mean power of the constellation; Arrangements for increasing the shape gain of a signal set

Definitions

  • the present invention relates to the field of communications, and in particular, to a method and apparatus for modulating TFCI information. Background technique
  • MBMS Multimedia Broadcast and Multicast Service
  • QAM quadrature amplitude modulation
  • LCR TDD MBMS Low Chip Rate Time Division Duplex MBMS
  • LCR TDD MBMS Low Chip Rate Time Division Duplex MBMS
  • the four slot formats shown in Figure 1 can be used.
  • the four slot formats set the size and composition domain of the data transmitted in each slot, and whether or not the setting is set.
  • Transport Format Combination Indication (TFCI) information is carried in the transmitted data.
  • the TFCI information is used to indicate a combination of data, for example, indicating that the first 20 bits of the 80 bits of data obtained by the receiver are the first group of data, and the last 60 bits are the second group of data.
  • each time slot contains 5 ms, and transmitting one data frame requires two time slots, that is, 10 ms.
  • a 10 ms data frame occupies a first time slot and a second time slot. If the data frame carries 8 bits of TFCI information, the TFCI information is divided into two parts, and The first partial TFCI information of 4 bits and the second partial TFCI information of 4 bits are placed at respective positions in the first time slot and the second time slot, respectively.
  • the following takes the first time slot as an example.
  • the data transmitted in the first time slot is divided into the first part data and the second part data.
  • the first partial TFCI information is placed at the end of the first partial data in the first time slot; for the same reason, the second partial TFCI information is placed in the second time slot.
  • the end of a portion of the data In this way, 8 bits of TFCI information can be transmitted to the receiver through the data frame.
  • TTI transmission time interval
  • the data length of the TFCI information is only 8 bits, which can be seen if the TFCI information is lost during transmission. If there is more, it is convenient to receive and cannot demodulate the corresponding data portion based on the obtained TFCI information.
  • the LCR TDD 16QAM constellation there are 16 energy points. Each energy point is identified by a binary code with a data length of 4 bits. The intersection of the Q axis and the I axis of the coordinate axis is called the origin of the LCR TDD 16QAM constellation. The distance from the energy point to the origin is associated with the power it has, and the energy point that is further away from the origin has a higher power.
  • the four energy points closest to the origin are called low energy points, also called minimum power points; the four energy points farthest from the origin are called high energy points, also called maximum power.
  • the remaining eight energy points are called intermediate energy points, also known as intermediate power points.
  • the modulated TFCI information may still fail to achieve the desired signal strength, thereby affecting the demodulation effect of the receiver; on the other hand, in the modulation process, there are multiple mappings of different TFCI information, in this case, If the number of times the TFCI information is mapped to the low energy point is significantly different from the number of times the TFCI information is mapped to the high energy point, a large peak-to-average ratio (ratio of the peak value to the average value) is generated in the system, which easily causes the system to be caused. The average power fluctuation in the system, which in turn affects the stability of the system. Summary of the invention
  • the embodiment of the invention provides a modulation method and device for TFCI information, which not only ensures the demodulation performance of the modulated TFCI information, but also avoids the problem of average power fluctuation caused by the modulation of the TFCI information.
  • a transmission format combination indicating a modulation method of TFCI information including the steps:
  • the original TFCI information is equally divided in units of 2 bits; the TFCI information of each part after the equalization is extended to correspond to the identifier of at least one specified energy point in the preset constellation;
  • the expanded portions of the TFCI information are mapped to corresponding energy points for modulation.
  • a modulation apparatus for modulating a transport format combination indicating TFCI information comprising:
  • a storage unit configured to store a preset constellation map
  • An extension unit configured to divide the acquired original TFCI information in units of 2 bits in a transmission time interval, and extend the equalized portion of the TFCI information to at least one specified energy point in the preset constellation diagram Corresponding to the logo;
  • a modulating unit configured to map the extended partial TFCI information to a corresponding energy point.
  • each part of the TFCI information that is equally divided from the original TFCI information in units of 2 bits is extended to at least one specified energy point in the preset constellation diagram.
  • the identification, and mapping the extended TFCI information to the corresponding energy point without offset so that the signal strength of the TFCI information in the system can be ensured, thereby ensuring the demodulation performance of the TFCI information, and Also avoids causing average power fluctuations in the system, from And to some extent, improve the stability of the system.
  • FIG. 1 is a schematic diagram of a 16QAM slot format adopted by the LCR TDD MBMS in the prior art
  • FIG. 2 is a schematic diagram of a data frame structure adopted by the LCR TDD MBMS in the prior art
  • FIG. 3 is a LCR TDD 16QAM used in the prior art. Constellation;
  • FIG. 4 is a first LCR TDD 16QAM constellation diagram used in the embodiment of the present invention
  • FIG. 5 is a functional structural diagram of a first modulation apparatus according to an embodiment of the present invention
  • 6A is a flowchart of a first method for modulating TFCI information according to an embodiment of the present invention
  • 6B is a schematic structural diagram of a first data frame according to an embodiment of the present invention.
  • FIG. 7A is a functional structural diagram of a second modulation apparatus according to an embodiment of the present invention.
  • FIG. 7B is a flowchart of a second method for modulating TFCI information according to an embodiment of the present invention.
  • FIG. 7C is a second LCR TDD 16QAM constellation diagram used in the embodiment of the present invention
  • FIG. 8A is a functional structural diagram of a third modulation apparatus according to an embodiment of the present invention.
  • 8B and 8C are third and fourth types of LCR TDD 16QAM used in the embodiment of the present invention.
  • FIG. 9 is a flowchart of a third method for modulating TFCI information according to an embodiment of the present invention.
  • FIG. 10 is a schematic structural diagram of a second data frame according to an embodiment of the present invention. detailed description
  • the original TFCI information acquired in units of 2 bits is obtained in one TTI.
  • the constellation is used to modulate TFCI information, and the specified energy point is not Include a minimum power point in the constellation diagram, where: if the number of specified energy points is greater than 1, all specified energy points have the same power;
  • the expanded portions of the TFCI information are mapped to corresponding energy points for modulation.
  • LCR TDD MBMS low-chip time division duplex multimedia broadcast and multicast service
  • the original TFCI information with a data length of 8 bits is first expanded, and converted into a new data length of 16 bits.
  • the original TFCI information is "00011011".
  • the original TFCI information is first divided into four parts, namely "00", “01”, “10” and “11”, then refer to the table items d4k+2 and d4k+3 in Table 1, and then add 2bits of data at the end of each part of TFCI information, so that the data length of each group of TFCI information is extended from 2bits to 4bits, that is, conversion "0011",
  • the original TFCI information with a data length of 8 bits is updated to a new TFCI information with a data length of 16 bits, namely "0011011110111111".
  • the square of the distance between each energy point and the origin represents the magnitude of the signal power of the TFCI information mapped to the energy point, for example, the energy point 0101 and the origin. If the distance is a, then mapping a certain TFCI information to energy point 0101 without offset means that the signal power of the TFCI information is modulated to a 2 .
  • the energy points in the LCR TDD 16QAM constellation are uniformly distributed in a square, and the diagonals of the square coincide with the Q axis and the I axis respectively.
  • the energy points are identified as “0011", "0111
  • the four energy points of ", “1011” and “1111” are equal to the distance from the origin and farthest from the origin with respect to other energy points, and therefore, are identified as “0011”, “0111”, “1011”, and “1111”
  • the four energy points are high energy points, also called maximum power points, so if the TFCI information can be mapped to "0011", "0111” without offset, The four high energy points "1011” and “1111” can maintain the maximum signal power of the TFCI information, thereby ensuring the demodulation performance of the TFCI information.
  • a modulation apparatus for modulating TFCI information includes a storage unit 50, an extension unit 51, and a modulation unit 52.
  • the storage unit 50 is configured to store preset slot format information and an LCR TDD 16QAM constellation for modulating TFCI information.
  • the extension unit 51 is configured to divide the acquired original TFCI information into four parts in units of 2 bits in the TTI, and separately expand the four parts of the TFCI information according to the LCR TDD 16QAM constellation map, so as to expand
  • the four-part TFCI information respectively corresponds to the identification of four designated power points in the LCR TDD 16QAM constellation;
  • the modulating unit 52 is configured to map the extended four-part TFCI information to corresponding power points in the LCR TDD 16QAM constellation. among them:
  • the expansion unit 51 further includes a first determining unit 510 and a first processing unit 511.
  • the first determining unit 510 is configured to determine that the specified energy point is the maximum power point in the LCR TDD 16QAM constellation;
  • the first processing unit 511 is configured to expand the divided partial TFCI information to correspond to the identifier of the maximum power point.
  • the detailed process of the first method for modulating the TFCI information by the modulating device according to the LCR TDD 16QAM constellation is as follows:
  • Step S600 The modulation device acquires the original TFCI information that needs to be modulated in the TO.
  • the original TFCI information is "00011011".
  • Step S610 The modulation device divides the original TFCI information into four parts in units of 2 bits, and the four parts of the TFCI information are "00", "01", “10", and "11", respectively.
  • Step S620 The four-part TFCI information is extended according to Equation 1, and each part of the TFCI information with a data length of 2 bits is converted into TFCI information with a data length of 4 bits. k+l [1]
  • b2k and b2k+l represent the first and second binary codes in each part of the TFCI information before the expansion, respectively, d4k, d4k+l, d4k+2 and d4k+3 respectively represent the extended 4bits of each group.
  • the first, second, third, and fourth binary codes in the TFCI information are the first, second, third, and fourth binary codes in the TFCI information.
  • Step S630 modulating the expanded first, second, third, and fourth partial TFCI information respectively, that is, mapping the four-part TFCI information to the four maximum power points in the LCR TDD 16QAM constellation without offset. .
  • the modulation apparatus after modulating the expanded four-part TFCI information, respectively places them in corresponding positions in the data frame to encapsulate the data frame.
  • the first part and the second part of the TFCI information are respectively placed on both sides of the Midamble code in the first time slot, that is, the first part of the data in the first time slot.
  • the front end and the front end of the second partial data; for the same reason, the third partial and fourth partial TFCI information are respectively placed on both sides of the Midamble code in the second time slot.
  • the four-part TFCI information may also be placed at other locations in each time slot, for example, the front end of the first portion of data and the end of the second portion of data, which are not described herein.
  • the modulation device After the modulation device encapsulates the data frame, it can send it to the corresponding receiver.
  • the modulation device when the LCR TDD MBMS service uses a Transmission Time Interva (TTI) with a duration greater than 10 ms, for example, 20 ms, 40 ms, or 80 ms, the modulation device repeatedly transmits the 10 ms data frame in a period of 10 ms. .
  • TTI Transmission Time Interva
  • the demodulation performance of the TFCI information can be ensured to the greatest extent, and at the same time, since the four maximum power points have the same power, thus, the modulation Power fluctuations do not occur in the system during the process.
  • the modulation device only needs to map the extended partial TFCI information to the same maximum power point "1111” for modulation, or respectively to the two maximum power points"
  • the same technical effect can be achieved by modulating 0011" and "1111".
  • the modulating device may alternately modulate the same TFCI information between the maximum power point and the minimum power point.
  • the expansion unit 51 in the modulating device further includes a second determining unit 512 and a second processing unit 513.
  • the second determining unit 512 is configured to determine a minimum power point in the LCR TDD 16QAM constellation
  • the second processing unit 513 is configured to expand the divided partial TFCI information to correspond to the identifier of the minimum power point;
  • the modulating device alternately uses the first processing unit 511 and the second processing unit 513 to expand the TFCI information after the equalization according to a preset period, that is, in a preset period of the TTI.
  • the TFCI information is extended, and, in one of any two adjacent cycles, the equalized partial TFCI information is extended to correspond to the identification of the maximum power point, and in another cycle, the equalization is performed.
  • Each part of the TFCI information is extended to correspond to the identification of the minimum power point.
  • the modulating unit 52 is configured to map the extended partial TFCI information to a corresponding maximum power point or a minimum power point.
  • one TTI includes 20 ms
  • a data frame is transmitted for 10 ms
  • the modulation device needs to modulate the TFCI information twice before encapsulating the A data frame and the B data frame.
  • FIG. 7B in this embodiment, the detailed process of the second method for modulating the TFCI information by the modulating device according to the LCR TDD 16QAM constellation diagram as follows:
  • Step S700 The modulation device acquires the original TFCI information that needs to be modulated in the UI.
  • the original TFCI information is "00011011".
  • Step S710 The modulation device divides the original TFCI information into four parts in units of 2 bits, and the four parts of the TFCI information are "00", "01", “10", and "11", respectively.
  • Step S720 The modulation device expands “00”, “01”, “10”, and “11” according to Formula 1, respectively, and converts them into “0011”, “0111”, “1011”, and “1111", so that Corresponding to the identification of the four maximum power points in the LCR TDD 16QAM constellation.
  • Step S730 The modulating device respectively modulates the first, second, third and fourth partial TFCI information extended according to the formula 1, as shown in FIG. 4, that is, "0011", “0111”, “1011” and “1111” is mapped to the four maximum power points in the LCR TDD 16QAM constellation without offset, respectively.
  • the modulating device After modulating the expanded first, second, third, and fourth portions of TFCI information, the modulating device encapsulates the TFCI information in a corresponding position in the A data frame.
  • Step S740 The modulation device expands “00”, “01”, “10”, and “11” according to Formula 2, and converts them into “0000”, “0100”, “1000”, and “1100", so that Corresponding to the identification of the four minimum power points in the LCR TDD 16QAM constellation.
  • Equation 2 when the modulation device expands the above four-part TFCI information according to Formula 2, two binary codes are added at the end of each group of TFCI information. 00".
  • Step S750 The modulating device respectively modulates the first, second, third and fourth partial TFCI information extended according to the formula 2, as shown in FIG. 7C, that is, "0000", “0100", “1000” and “1100” is mapped to the four minimum powers in the LCR TDD 16QAM constellation without offset, respectively Point.
  • the modulating device After modulating the expanded first, second, third, and fourth portions of TFCI information, the modulating device encapsulates the TFCI information in a corresponding position in the B data frame.
  • the modulating device After the B-packet completes the B data frame, the modulating device further expands each part of the TFCI information that is evenly separated from the original TFCI information according to Equation 1, and maps the expanded TFCI information to the LCR TDD 16QAM constellation map.
  • the modulated partial TFCI information is encapsulated in corresponding positions in the C data frame; for the same reason, after the C data frame is encapsulated, the modulation device again according to formula 2
  • Each part of the TFCI information is extended in the TFCI information, and the extended part of the TFCI information is respectively mapped to the four minimum power points according to the LCR TDD 16QAM constellation, and then encapsulated in the D data frame respectively. The corresponding location.
  • the modulation device when a TTI in the system contains a duration greater than 10 ms, for example, 20 ms, 40 ms, or 80 ms, the modulation device alternately uses the maximum power point and the minimum power point pair to be separated from the original TFCI information.
  • Each part of the TFCI information is modulated, thus not only ensuring the demodulation performance of the TFCI information, but also equalizing the average power in the system, and also avoiding the phenomenon that the average power is high in the system, thereby further improving the stability of the system. .
  • the modulation apparatus in order to balance the demodulation performance of the TFCI information and the peak-to-average ratio in the system, modulates each part of the TFCI information that is divided from the original TFCI information. It can be mapped to an intermediate power point in the LCR TDD 16QAM constellation for modulation.
  • the extension unit 51 in the modulation apparatus includes a third determination unit 514 and a third processing unit 515.
  • the third determining unit 514 is configured to determine that the specified energy point is an LCR TDD 16QAM constellation An intermediate power point in the figure, wherein the intermediate power point is an energy point that is not attributed to a maximum power point and a minimum power point in the constellation diagram;
  • the third processing unit 515 is configured to extend the equalized partial TFCI information to correspond to an identifier of an intermediate power point in the LCR TDD 16QAM constellation;
  • the modulating unit 52 is further configured to map the expanded partial TFCI information to the corresponding intermediate power point.
  • each energy point is uniformly distributed and the distance between any two adjacent energy points is equal, it can be seen that it is located in each quadrant and The eight intermediate power points identified as "0001", “0110”, “1010”, “1101”, “1001”, “0010", “1110”, and “0101" are equal to the origin, then mapped to The signal power of the TFCI information of the eight energy points is also equal.
  • the distance from the intermediate power point to the origin is greater than the distance from the minimum power point to the origin, and is smaller than the distance from the maximum power point to the origin.
  • the signal strength of the TFCI information can be guaranteed to a certain extent, and the average power in the system is neither too high nor too low, so that the demodulation performance of the TFCI information and the system can be balanced. Peak to average ratio.
  • the original TFCI information in the TTI is "00011011", and the modulation device is divided into four parts in units of 2 bits, which are respectively "00", "01", “10", and "11", and the modulation device
  • the modulation device When the four parts of TFCI information are modulated, they may be mapped to any four intermediate power points in the LCR TDD 16QAM constellation after expansion; wherein a preferred modulation method is to extend the four-part TFCI.
  • the information is mapped to intermediate power points located in different quadrants, respectively.
  • the detailed process of the third method for modulating the TFCI information by the modulation device is as follows:
  • Step S900 The modulation device acquires the original TFCI information "00011011” in the TTI, and divides it into “00", “01”, “10”, and “11” in units of 2 bits.
  • Step S910 The modulation device expands “00”, “01”, “10”, and “11” according to Formula 3, and converts it to "0001", “0110", “1010”, and “1101", respectively Corresponds to the identification of the four intermediate power points shown in FIG. 8B.
  • the modulation device expands "00", “01”, “10”, and “11” according to Equation 4, converting it to "0010", “0101”, “1001”, and “1110", respectively, and Fig. 8C The identification of the four intermediate power points shown corresponds.
  • Step S920 The modulation device modulates the expanded portions of the TFCI information, that is, "0001", “0110”, “1010”, and “1101” are respectively offset without offset Map to four intermediate power points in the LCR TDD 16QAM constellation as shown in Figure 8B; or, map "0010", “0101”, “1001”, and “1110” to offset as shown in Figure 8C, respectively.
  • the modulating device can alternately use the formula 3 and the formula 4 for the data frame in the ⁇ to divide the four from the original TFCI information.
  • the partial TFCI information is spread and alternately modulated according to the LCR TDD 16QAM constellation as shown in Fig. 8B and the LCR TDD 16QAM constellation as shown in Fig. 8C. In this way, a balance can be achieved between maintaining the demodulation performance of the TFCI information and the peak-to-average ratio in the equalization system, and alternately using the above two methods to modulate the extended TFCI information also brings a certain degree to the system.
  • the energy point labeled "1001" is far away from the interference to a certain extent, so that the ideal modulation result is obtained, so that the demodulation performance of the modulated TFCI information can be ensured, thereby greatly reducing the probability of occurrence of the mediation error, and further Bring a certain diversity gain to the system.
  • the modulating device may map the extended partial TFCI information to the same intermediate power point "1110" for modulation, or respectively map to two intermediate power points "1110" and “1101". "The same technical effect can be achieved by performing the modulation. This embodiment only provides a preferred embodiment, and details are not described herein again.
  • the modulation apparatus may also use the method provided in the embodiment of the present invention to The TFCI information is modulated.
  • the data length of the TFCI information is still 8 bits
  • the modulating device can also divide the acquired original TFCI information into four parts, and respectively at the last position of the four-part TFCI information. 4 bits are added to expand the data length of the four-part TFCI information from 2 bits to 6 bits, that is, the data length of the original TFCI information is extended from 8 bits to 24 bits, and then the modulation device maps the expanded TFCI information without offset. At least one energy point other than the minimum power point in the LCRTDD 64QAM constellation for modulation.
  • the modulation device only needs to equally divide the TFCI information in units of 2 bits, that is, each method can be used to Part of the TFCI information is extended, and the extended partial TFCI information is modulated according to the LCR TDD 64QAM constellation.
  • the LCR TDD MBMS adopts the 256QAM modulation scheme
  • the TFCI information in the system can also be modulated by using various methods provided by the present invention, and details are not described herein again.
  • the modulation device will be expanded in addition to the method shown in FIG. 6B.
  • the TFCI information is encapsulated on both sides of the Midamble code, and the extended TFCI information can also be encapsulated on both sides of the data portion in the data frame.
  • the modulation device acquires 16 bits of original TFCI information, divides it into eight parts and expands it in units of 2 bits, and then transmits the extension.
  • the eight-part TFCI information needs to occupy two data frames with a duration of 10 ms.
  • Each data frame still contains two time slots with a duration of 5 ms. In each time slot, each of the two extended partial TFCI information is placed separately.
  • the Preamble code and at the end of the data portion that is, on both sides of the data portion.
  • the modulation apparatus when the modulation apparatus modulates the acquired original TFCI information, the TFCI information that is separated from the original TFCI information is expanded according to the identifier of the energy point specified in the preset constellation diagram. And mapping the extended TFCI information to the corresponding energy point without offset, so that the signal strength of the TFCI information in the system can be ensured, thereby ensuring the demodulation performance of the TFCI information, and at the same time, avoiding The average power fluctuation is caused in the system, which improves the stability of the system to some extent.

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Description

一种 TFCI信息的调制方法及装置
技术领域
本发明涉及通信领域, 特别涉及一种 TFCI信息的调制方法及装置。 背景技术
目前, 在多媒体广播和组播业务(Multimedia Broadcast and Multicast Service, MBMS ) 中, 为了提高系统的吞吐量, 在辅助公共控制物理信道
( Secondary Common Control Physical Channel, PCH )上引入了正交幅度调制
( quadrature amplitude modulation, QAM )方案。
下面以低码片时分双工多媒体广播和组播业务 ( Low Chip Rate Time Division Duplex MBMS , LCR TDD MBMS )为例进行介绍。 LCR TDD MBMS 在采用 16QAM方案后,可以采用如图 1所示的四种时隙格式, 四种时隙格式 设定了各时隙中所传输的数据的大小和组成域, 以及设定了是否在传输的数 据中携带传输格式组合指示(TFCI )信息。 TFCI信息用于指示数据的组合方 式,例如,指示接收方其获得的 80bits数据中前 20bits为第一组数据,后 60bits 为第二组数据。 如图 1所示, 在采用序号为 "0" 和 "2" 的两种时隙格式时, 无需在传输的数据中携带 TFCI信息; 而在采用序号为 "1" 和 "3" 的两种时 隙格式时, 需要在传输的数据中携带 8bits的 TFCI信息。
目前 , 在釆用 16QAM方案的 LCR TDD MBMS中, 每个时隙包含 5ms, 传输一个数据帧需要占用两个时隙, 即 10ms。 参阅图 2所示, 某一个 10ms 的数据帧占用了第一时隙和第二时隙, 若在该数据帧中携带 8bits的 TFCI信 息, 则需将所述 TFCI信息均分为两部分, 并将 4bits的第一部分 TFCI信息和 4bits的第二部分 TFCI信息分别放置在第一时隙和第二时隙中的相应位置上。 下面以第一时隙为例进行说明, 如图 2所示, 根据图 1所示的时隙格式的规 定, 在第一时隙中传输的数据被分为第一部分数据和第二部分数据, 在第一 部分数据和第二部分数据之间夹带用于进行信道估计的 Midambled码, 当需 要传输 TFCI信息时, 将所述第一部分 TFCI信息放置在该第一时隙中的第一 部分数据的末端; 同理, 将所述第二部分 TFCI信息放置在所述第二时隙中的 第一部分数据的末端。 这样, 便可以通过所述数据帧将 8bits的 TFCI信息传 送给接收方。 当采用 20ms/40ms/80ms 的传输时间间隔 (Transmission Time Interva, TTI ) 时, 以 10ms为周期, 重复传输所述数据帧。
现有技术下,各种信息在传输过程中均会有所损耗,在采用了 16QAM方 案的 LCR TDD MBMS业务中, TFCI信息的数据长度仅为 8bits, 可见, 若 TFCI信息在传输过程中损耗过多, 则接收方便无法根据获得的 TFCI信息对 相应的数据部分进行解调。
针对上述问题, 现有的解决方案如下:
参阅图 3所示,在 LCR TDD MBMS中,为了保持 TFCI信息的信号强度, 在将 TFCI信息添加到数据帧中时, 需要先将其映射到 LCR TDD 16QAM星 座图进行调制,如图 3所示, LCR TDD 16QAM星座图中,存在 16个能量点, 每一个能量点用数据长度为 4bits的二进制码进行标识, 而坐标轴 Q轴和 I轴 的交点称为 LCR TDD 16QAM星座图的原点, 每个能量点到原点的距离与其 具有的功率相关联, 距离原点越远的能量点所具有的功率越高。 因此, 在实 际应用中, 距离原点最近的四个能量点被称为低能量点, 也称为最小功率点; 距离原点最远的四个能量点被称为高能量点, 也称为最大功率点; 而剩余的 八个能量点则被称为中间能量点, 也称为中间功率点。 在对 TFCI信息进行调 制时, 需要将 8bits的 TFCI信息无偏移地映射到 LCR TDD 16QAM星座图中 的两个能量点上, 从而使 TFCI信息保持一定的信号强度; 例如, 若 TFCI信 息为 "11011000" , 那么, 将其分为 "1101" 和 "1000" 两个部分, 并将两部 分 TFCI信息分别映射到标识为 "1101" 和 "1000" 的两个能量点上以进行调 制。
但是, 使用上述方法并不能达到令人满意的效果, 这是由于将 8bits的 TFCI信息映射到 LCR TDD 16QAM星座图中的第一能量点和第二能量点后, 若第一能量点或 /和第二能量点为距离原点最近的低能量点, 例如, "1000", 那么, 经过调制的 TFCI信息仍有可能达不到理想的信号强度, 进而影响接收 方的解调效果; 另一方面, 在调制过程中, 存在多次映射不同的 TFCI信息的 情况, 这时, 若将 TFCI信息映射到低能量点的次数与将 TFCI信息映射到高能 量点的次数相差悬殊, 则会在系统中产生较大的峰均比 (峰值与平均值的比 值), 从而容易引起系统中的平均功率波动, 进而影响系统的稳定性。 发明内容
本发明实施例提供了一种 TFCI信息的调制方法及装置,既保证了调制后 的 TFCI信息的解调性能, 又避免了因调制 TFCI信息而引起的平均功率波动 问题。
本发明实施例提供的技术方案如下:
一种传输格式组合指示 TFCI信息的调制方法, 包括步骤:
在传输时间间隔 TTI内, 以 2bits为单位对原 TFCI信息进行均分; 将均分后的各部分 TFCI信息扩展至与预设的星座图中至少一个指定能 量点的标识相对应;
将扩展后的各部分 TFCI信息映射至相应的能量点以进行调制。
一种用于调制传输格式组合指示 TFCI信息的调制装置, 包括:
存储单元, 用于存储预设的星座图;
扩展单元,用于在传输时间间隔 ΤΉ内 , 以 2bits为单位对获取的原 TFCI 信息进行均分,以及将均分后的各部分 TFCI信息扩展至与预设的星座图中至 少一个指定能量点的标识相对应;
调制单元, 用于将扩展后的各部分 TFCI信息映射至相应的能量点。
本发明实施例中,调制装置对原 TFCI信息进行调制时,将从所述原 TFCI 信息以 2bits为单位均分出的各部分 TFCI信息扩展至与预设的星座图中至少 一个指定能量点的标识相对应 , 以及将扩展后的各 TFCI信息无偏移地映射至 对应的能量点, 这样, 便可以保证系统中 TFCI信息的信号强度, 从而保证了 所述 TFCI信息的解调性能, 同时, 也避免了在系统中引起平均功率波动, 从 而在一定程度上提高了系统的稳定性。 附图说明
图 1为现有技术中 LCR TDD MBMS采用的 16QAM时隙格式示意图; 图 2为现有技术中 LCR TDD MBMS采用的一种数据帧结构示意图; 图 3为现有技术中釆用的 LCR TDD 16QAM星座图;
图 4为本发明实施例中采用的第一种 LCR TDD 16QAM星座图; 图 5为本发明实施例中第一种调制装置功能结构图;
图 6A为本发明实施例中第一种调制 TFCI信息的方法流程图;
图 6B为本发明实施例中第一种数据帧结构示意图;
图 7A为本发明实施例中第二种调制装置功能结构图;
图 7B为本发明实施例中第二种调制 TFCI信息的方法流程图;
图 7C为本发明实施例中采用的第二种 LCR TDD 16QAM星座图; 图 8A为本发明实施例中第三种调制装置功能结构图;
图 8B 和图 8C 为本发明实施例中采用的第三种和第四种 LCR TDD 16QAM
星座图;
图 9为本发明实施例中第三种调制 TFCI信息的方法流程图;
图 10为本发明实施例中第二种数据帧结构示意图。 具体实施方式
为了既保证调制后的 TFCI信息的解调性能, 同时又避免因调制 TFCI信 息而引起的系统中平均功率波动, 本发明实施例中, 在一个 TTI内, 以 2bits 为单位对获取的原 TFCI信息进行均分; 并将均分后的各部分 TFCI信息扩展 至与预设的星座图中至少一个指定能量点的标识相对应, 所述星座图用于调 制 TFCI信息, 且所述指定能量点不包含星座图中的最小功率点, 其中: 若所 述指定能量点的数量大于 1 , 则所有指定能量点均具有相同的功率; 接着, 将 扩展后的各部分 TFCI信息映射至相应的能量点以进行调制。
下面以低码片时分双工多媒体广播和组播业务(LCR TDD MBMS )为例 进行详细说明。
本发明实施例中 ,在采用 16QAM的 LCRTDD MBMS中传送 TFCI信息时, 先将数据长度为 8bits的原 TFCI信息进行扩展, 转换为数据长度为 16bits的新
TFCI信息。 例如, 原 TFCI信息为 "00011011", 参阅表 1中表项 d4k和 d4k+l所 示, 先将原 TFCI信息均分为四个部分, 分别为 "00"、 "01"、 "10" 和 "11", 接着参阅表 1中表项 d4k+2和 d4k+3所示, 再在各部分 TFCI信息的末端添加 2bits 的数据, 使每组 TFCI信息的数据长度由 2bits扩展为 4bits, 即转换为 "0011"、
"0111"、 "1011"、 "1111"。 这样, 数据长度为 8bits的原 TFCI信息便更新为数 据长度为 16bits的新 TFCI信息, 即 "0011011110111111"。
Figure imgf000007_0001
Figure imgf000007_0002
上述作法基于如下考虑:
参阅图 4所示,在 LCR TDD 16QAM星座图中,每个能量点与原点的距 离的平方值即表示映射到该能量点的 TFCI信息所具有的信号功率的大小,例 如,能量点 0101与原点的距离为 a,那么将某一 TFCI信息无偏移地映射至能 量点 0101时, 即表示将该 TFCI信息的信号功率调制至 a2。如图 4所示, LCR TDD 16QAM星座图中的能量点呈正方形均匀分布,且该正方形的对角线分别 与 Q轴和 I轴重合,可以看出,能量点标识为 "0011"、 "0111"、 "1011"和 "1111" 的四个能量点与原点的距离相等且相对于其它能量点距离原点最远, 因此, 标识为 "0011"、 "0111"、 "1011" 和 "1111" 的四个能量点即为高能量点, 也 称为最大功率点, 那么如果能将 TFCI信息无偏移地映射至 "0011"、 "0111"、 "1011" 和 "1111" 这四个高能量点, 即可以使所述 TFCI信息保持最大信号 功率, 从而保证了所述 TFCI信息的解调性能。
参阅图 5所示, 本实施例中, 用于对 TFCI信息进行调制的调制装置包括 存储单元 50、 扩展单元 51和调制单元 52。
所述存储单元 50用于存储预设的时隙格式信息和用于调制 TFCI信息的 LCR TDD 16QAM星座图。
所述扩展单元 51用于在 TTI内,以 2bits为单位将获取的原 TFCI信息均 分为四部分, 以及才艮据 LCR TDD 16QAM星座图对所述四部分 TFCI信息分 别进行扩展, 使扩展后的所述四部分 TFCI信息分别与 LCR TDD 16QAM星 座图中的四个指定功率点的标识相对应;
所述调制单元 52用于将扩展后的所述四部分 TFCI信息分别映射至 LCR TDD 16QAM星座图中对应的功率点。 其中:
所述扩展单元 51进一步包括第一确定单元 510和第一处理单元 511。 所述第一确定单元 510用于确定指定能量点为 LCR TDD 16QAM星座图 中的最大功率点;
所述第一处理单元 511用于将均分后的各部分 TFCI信息扩展至与所述最 大功率点的标识相对应。
参阅图 6A所示, 本实施例中, 调制装置根据 LCR TDD 16QAM星座图 对 TFCI信息进行调制的第一种方法的详细流程如下:
步骤 S600: 调制装置获取 TO内需要进行调制的原 TFCI信息, 本实施 例中, 原 TFCI信息为 "00011011"。
步骤 S610: 调制装置以 2bits为单位, 将原 TFCI信息均分为四个部分, 所述四部分 TFCI信息分别为 "00"、 "01"、 "10" 和 "11"。
步骤 S620: 根据公式 1分别对上述四部分 TFCI信息进行扩展, 将每一 部分数据长度为 2bits的 TFCI信息分别转换成数据长度为 4bits的 TFCI信息。
Figure imgf000008_0001
k+l [1]
Figure imgf000009_0001
其中, b2k和 b2k+l 分别表示扩展前的每一部分 TFCI信息中的第一个和 第二个二进制代码, d4k、 d4k+l、 d4k+2和 d4k+3分别表示扩展后的每一组 4bits 的 TFCI信息中的第一、 第二、 第三和第四个二进制代码。
可见, 本实施例中, 在对上述四部分 TFCI信息进行扩展时, 是在每组 TFCI信息的末位分别添加两个二进制代码 "11" , 这样, 上述四部分 TFCI信 息在扩展后便转换为 "0011"、 "0111"、 "1011" 和 "1111" , 如图 4所示, 扩 展后的第一、 第二、 第三和第四部分 TFCI信息分别与 LCR TDD 16QAM星 座图中四个最大功率点的标识相对应。
步骤 S630: 对扩展后的第一、 第二、 第三和第四部分 TFCI信息分别进 行调制, 即将所述四部分 TFCI信息无偏移地映射至 LCR TDD 16QAM星座 图中的四个最大功率点。
基于上述实施例,所述调制装置在将扩展后的四部分 TFCI信息调制完毕 后,将其分别放置在数据帧中的相应位置以封装数据帧。例如,如图 6B所示, 在一个 10ms的数据帧中, 第一部分和第二部分 TFCI信息被分别放置在第一 时隙中的 Midamble码的两侧, 即第一时隙中第一部分数据的末端和第二部分 数据的前端; 同理, 第三部分和第四部分 TFCI信息被分别放置在第二时隙中 的 Midamble码的两侧。 当然, 还可以将所述四部分 TFCI信息放置在各时隙 中的其它位置, 例如, 第一部分数据的前端和第二部分数据的末端, 在此不 再赘述。 调制装置将数据帧封装完毕后, 便可以将其发送给相应的接收方。
在实际应用中, 当 LCR TDD MBMS业务采用时长大于 10ms的传输时间 间隔( Transmission Time Interva, TTI ) 时, 例如, 20ms、 40ms或 80ms, 调 制装置以 10ms为周期, 重复传输所述 10ms的数据帧。 这样, 由于每次都将 扩展后的 TFCI信息映射至最大功率点, 因此可以在最大程度上保证 TFCI信 息的解调性能, 同时, 由于四个最大功率点所具有的功率相同, 因而, 在调 制过程中不会在系统中产生功率波动。 当然, 若原 TFCI信息为 "11111111"或 "00110011" , 则调制装置只需将 扩展后的各部分 TFCI信息映射至同一个最大功率点 "1111" 进行调制, 或者 分别映射至两个最大功率点 "0011"和 "1111"进行调制, 即可达到同样的技 术效果。
在上述实施例的基础上, 为了进一步避免系统中的平均功率偏高, 调制 装置还可以在最大功率点和最小功率点之间交替选择一种对同一个 TFCI信 息进行调制。 参阅图 7A所示, 本实施例中, 调制装置内的扩展单元 51进一 步包括第二确定单元 512和第二处理单元 513。
所述第二确定单元 512, 用于确定 LCR TDD 16QAM星座图中的最小功 率点;
所述第二处理单元 513, 用于将均分后的各部分 TFCI信息扩展至与所述 最小功率点的标识相对应; 其中:
在一个 TTI内, 调制装置按照预设的周期交替使用第一处理单元 511和 第二处理单元 513对均分后的各部分 TFCI信息进行扩展, 即: 在所述 TTI 内以预设周期为单位对 TFCI信息进行扩展, 并且, 在任意相邻的两个周期中 的一个周期, 将均分后的各部分 TFCI信息扩展至与最大功率点的标识相对 应, 在另一个周期, 将均分后的各部分 TFCI信息扩展至与最小功率点的标识 相对应。
而调制单元 52用于将扩展后的各部分 TFCI信息映射至相应的最大功率 点或最小功率点。
Figure imgf000010_0001
本实施例中, 由于一个 TTI包含 20ms, 且传输一个数据帧需占用 10ms, 可见, 在一个 TTI 中可以传输两个数据帧, 按传输顺序将这两个数据帧分别 称为 A数据帧和 B数据帧, 那么调制装置在封装 A数据帧和 B数据帧之前, 需要对 TFCI信息进行两次调制。 参阅图 7B所示, 本实施例中, 调制装置根 据 LCR TDD 16QAM星座图对 TFCI信息进行调制的第二种方法的详细流程 如下:
步骤 S700: 调制装置获取 ΤΉ内需要进行调制的原 TFCI信息, 本实施 例中, 原 TFCI信息为 "00011011",
步骤 S710: 调制装置以 2bits为单位, 将原 TFCI信息均分为四个部分, 所述四部分 TFCI信息分别为 "00"、 "01"、 "10" 和 "11"。
步骤 S720: 调制装置根据公式 1对 "00"、 "01"、 "10" 和 "11" 分别进 行扩展, 将其转换为 "0011"、 "0111"、 "1011" 和 "1111" , 使其分别与 LCR TDD 16QAM星座图中四个最大功率点的标识相对应。
步骤 S730: 调制装置对根据公式 1扩展的第一、 第二、 第三和第四部分 TFCI信息分别进行调制, 参阅图 4所示, 即是将 "0011"、 "0111"、 "1011" 和 "1111" 分别无偏移地映射至 LCR TDD 16QAM星座图中的四个最大功率 点。
对扩展后的第一、 第二、 第三和第四部分 TFCI信息进行调制后, 调制装 置将其封装在 A数据帧中的相应位置上。
步驟 S740: 调制装置根据公式 2对 "00"、 "01"、 "10" 和 "11" 分别进 行扩展, 将其转换为 "0000"、 "0100"、 "1000" 和 "1100" , 使其分别与 LCR TDD 16QAM星座图中四个最小功率点的标识相对应。
Figure imgf000011_0001
其中, 各符号的意义与公式 1 中相同, 从公式 2可以看出, 调制装置根 据公式 2对上述四部分 TFCI信息进行扩展时, 是在每组 TFCI信息的末位分 别添加两个二进制代码 "00"。
步骤 S750: 调制装置对根据公式 2扩展的第一、 第二、 第三和第四部分 TFCI信息分别进行调制, 参阅图 7C所示, 即是将 "0000"、 "0100"、 "1000" 和 "1100" 分别无偏移地映射至 LCR TDD 16QAM星座图中的四个最小功率 点。
对扩展后的第一、 第二、 第三和第四部分 TFCI信息进行调制后, 调制装 置将其封装在 B数据帧中的相应位置上。
在上述实施例中,若 TTI包含 40ms,即一个 TTI中需要传输四个数据帧, 按传输顺序将这四个数据帧分别称为 A数据帧、 B数据帧、 C数据帧和 D数 据帧,则调制装置在封装完 B数据帧后,再次根据公式 1对从原 TFCI信息中 均分出的各部分 TFCI信息进行扩展, 并将扩展后的各部分 TFCI信息分别映 射到 LCR TDD 16QAM星座图中的四个最大功率点以进行调制, 以及将调制 后的各部分 TFCI信息封装在 C数据帧中的相应位置上; 同理, 在封装完 C 数据帧后,调制装置再次根据公式 2对从原 TFCI信息中均分出的各部分 TFCI 信息进行扩展,以及在才 据 LCR TDD 16QAM星座图将扩展后的各部分 TFCI 信息分别映射至四个最小功率点后, 将其分别封装在 D数据帧中的相应位置 上。
当然, 也可以根据公式 2对将要封装在 A数据帧和 C数据帧中的各部分 TFCI信息进行调制,以及根据公式 1对将要封装在 B数据帧和 D数据帧中的 各部分 TFCI信息进行调制, 在此不再赘述。
从上述实施例可以看出, 当系统中的一个 TTI包含的时长大于 10ms时, 例如, 20ms, 40ms, 或 80ms, 调制装置交替使用最大功率点和最小功率点对 从原 TFCI信息中均分出的各部分 TFCI信息进行调制,这样,不但保证了 TFCI 信息的解调性能, 均衡了系统中的平均功率, 同时也避免了系统中出现平均 功率偏高的现象, 从而进一步提高了系统的稳定性。
区别于上述实施例, 在另一个实施例中, 为了兼顾 TFCI信息的解调性能 和系统中的峰均比, 调制装置在对从原 TFCI信息均分出的各部分 TFCI信息 进行调制时, 还可以将其分别映射到 LCR TDD 16QAM星座图中的中间功率 点上进行调制。 参阅图 8A所示, 本实施例中, 调制装置内的扩展单元 51包 括第三确定单元 514和第三处理单元 515。
所述第三确定单元 514, 用于确定指定能量点为 LCR TDD 16QAM星座 图中的中间功率点, 所述中间功率点为不归属于所述星座图中的最大功率点 和最小功率点的能量点;
所述第三处理单元 515,用于将均分后的各部分 TFCI信息扩展至与 LCR TDD 16QAM星座图中的中间功率点的标识相对应;
而调制单元 52进一步用于将扩展后的各部分 TFCI信息映射至对应的中 间功率点。
下面仍以原 TFCI信息为 "00011011" 为例进行详细说明。
参阅图 8B和图 8C所示, 在 LCRTDD 16QAM星座图中, 由于各能量点 是均匀分布的, 且任意两个相邻的能量点之间的距离相等, 因此可以看出, 位于各象限内且标识为 "0001"、 "0110"、 "1010"、 "1101"、 "1001"、 "0010"、 "1110" 和 "0101" 的八个中间功率点到原点的距离是相等的, 那么映射到 所述八个能量点的 TFCI信息的信号功率也是相等的。 如图 8B和图 8C所示, 中间功率点到原点的距离大于最小功率点到原点的距离, 同时小于最大功率 点到原点的距离,可见,若将扩展后的 TFCI信息映射到中间功率点进行调制, 那么, 也可以在一定程度上保证 TFCI信息的信号强度, 同时系统中的平均功 率既不会偏高, 也不会偏低, 这样, 便能够兼顾 TFCI信息的解调性能和系统 中的峰均比。
本实施例中, TTI内原 TFCI信息为 "00011011" , 调制装置以 2bits为单 位, 将其均分为四个部分, 分别为 "00"、 "01"、 "10" 和 "11" , 调制装置对 这四部分 TFCI信息进行调制时, 可以在扩展后将其分别映射到 LCR TDD 16QAM星座图中任意四个中间功率点上; 其中, 一种较佳的调制方式是将扩 展后的四部分 TFCI信息分别映射至位于不同象限内的中间功率点上。参阅图 9所示, 本实施例中, 在系统内一个 TTI的时长为 10ms时, 调制装置对 TFCI 信息进行调制的第三种方法的详细流程如下:
步骤 S900: 调制装置获取 TTI内原 TFCI信息 "00011011", 并以 2bits 为单位, 将其均分为 "00"、 "01"、 "10" 和 "11"。 步骤 S910: 调制装置根据公式 3对 " 00"、 "01"、 "10"和 "11"进行扩展, 将其转换为 "0001"、 "0110"、 "1010" 和 "1101" , 使其分别与图 8B所示的 四个中间功率点的标识相对应。
Figure imgf000014_0001
d4k+2 = ( d4k + d4k+l ) mod 2
d4k+3 = ( 1 + d4k + d4k+l ) mod 2
或者
调制装置根据公式 4对 "00"、 "01"、 "10" 和 "11" 进行扩展, 将其转 换为 "0010"、 "0101"、 "1001" 和 "1110", 使其分别与图 8C所示的四个中 间功率点的标识相对应。
Figure imgf000014_0002
d4k+2 = ( 1 + d4k + d4k+l ) mod 2
d4k+3 = ( d4k + d4k+l ) mod 2 步骤 S920:调制装置对扩展后的各部分 TFCI信息进行调制,即将" 0001"、 "0110"、 "1010" 和 "1101" 分别无偏移地映射至如图 8B所示的 LCR TDD 16QAM星座图中的四个中间功率点上; 或者, 将 "0010"、 "0101"、 "1001" 和 "1110" 分别无偏移地映射至如图 8C所示的 LCR TDD 16QAM星座图中 的四个中间功率点上。
基于上述实施例, 当系统中一个 TTI的时长大于 10ms时, 例如, 20ms、 40ms或 80ms,调制装置可以对 ΤΉ内的数据帧交替使用公式 3和公式 4对从 原 TFCI信息均分出的四部分 TFCI信息进行扩展, 并交替根据如图 8B所示 的 LCR TDD 16QAM星座图和如图 8C所示的 LCR TDD 16QAM星座图对所 述四部分 TFCI信息进行调制。 这样, 便可以在保持 TFCI信息的解调性能和 均衡系统内的峰均比之间达到一种平衡, 并且交替使用上述两种方式对扩展 后的 TFCI信息进行调制也给系统带来了一定的分集增益。 例如, 参阅图 8B 所示, 若标识为 "0011" 和 "0001" 的两个能量点之间存在较强干扰, 那么, 在将 TFCI信息映射到标识为 "0001"的能量点进行调制时所述干扰就会在一 定程度上影响调制结果, 可见, 如果再次将所述 TFCI信息映射到 "0001" 就 有可能仍得不到令人满意的调制结果; 因此, 再次对所述 TFCI信息进行调制 时, 将其映射到标识为 "1001" 的能量点以在一定程度上远离干扰, 从而得 到较为理想的调制结果, 这样, 便能保证调制后的 TFCI信息的解调性能, 从 而大大减少调解错误发生的概率, 进而给系统带来一定的分集增益。
当然, 若原 TFCI信息为 "11111111", 则调制装置可以将扩展后的各部 分 TFCI信息映射至同一个中间功率点 "1110" 进行调制, 或者分别映射到两 个中间功率点 "1110"和 "1101"进行调制, 均可以达到同样的技术效果, 本 实施例仅提供了一种较佳的实施方式, 在此不再赘述。
在实际应用中, 当 LCR TDD MBMS采用其它种类的调制方案时, 例如 64QAM调制方案、 256QAM调制方案 ...... , 调制装置也可以使用本发明实施 例中提供的方法来对系统中的 TFCI信息进行调制。
例如, 当 LCR TDD MBMS采用 64QAM调制方案时, TFCI信息的数据 长度仍为 8bits,那么调制装置也可以将获取的原 TFCI信息均分为四部分,并 分别在所述四部分 TFCI信息的末位添加 4bits, 以将所述四部分 TFCI信息的 数据长度均由 2bits扩展为 6bits,即将原 TFCI信息的数据长度由 8bits扩展为 24bits,接着调制装置将扩展后的各部分 TFCI信息无偏移地映射至 LCRTDD 64QAM 星座图中至少一个除最小功率点之外的能量点以进行调制。 另一方 面, 若原 TFCI信息的数据长度大于 8bits, 例如: 12bits、 16bits ... ..., 则调制 装置只需以 2bits为单位对所述 TFCI信息进行均分, 即可以通过上述方法对 各部分 TFCI信息进行扩展, 并根据 LCR TDD 64QAM星座图对扩展后的各 部分 TFCI信息进行调制。 同理, 当 LCR TDD MBMS采用 256QAM调制方 案时, 也可以运用本发明提供的多种方法对系统中的 TFCI信息进行调制, 在 此不再赘述。
此外, 在实际应用中, 调制装置除了采用图 6B所示的方式将扩展后的 TFCI信息封装在 Midamble码的两侧之外,还可以将扩展后的 TFCI信息封装 在数据帧中的数据部分的两侧。 参阅图 10所示, 以原 TFCI信息的数据长度 为 16bits为例, 调制装置获取 16bits的原 TFCI信息后, 以 2bits为单位将其 均分为八部分并进行扩展, 此时, 传送这扩展后的八部分 TFCI信息需要占用 两个时长为 10ms的数据帧,每个数据帧仍包含两个时长为 5ms的时隙;在每 个时隙中, 将每两个扩展后的部分 TFCI信息分别放置在 Preamble码的末端 和数据部分的末端, 也就是放置在数据部分的两侧。
本发明实施例中, 调制装置对获取的原 TFCI信息进行调制时, 根据预设 的星座图中指定的能量点的标识,对从所述原 TFCI信息均分出的各部分 TFCI 信息进行扩展, 以及将扩展后的各 TFCI信息无偏移地映射至对应的能量点, 这样, 便可以保证系统中 TFCI信息的信号强度, 从而保证了所述 TFCI信息 的解调性能, 同时, 也避免了在系统中引起平均功率波动, 从而在一定程度 上提高了系统的稳定性。
最后应说明的是: 以上实施例仅用以说明本发明实施例中的技术方案而 非限制, 尽管参照较佳实施例对本发明进行了详细说明, 本领域的普通技术 人员应当理解, 可以对本发明实施例中的技术方案进行修改或者等同替换, 而不脱离本发明实施例中技术方案的精神和范围。

Claims

权 利 要 求
1、 一种传输格式组合指示 TFCI信息的调制方法, 其特征在于, 包括步 骤:
在传输时间间隔 ΤΉ内, 以 2bits为单位对原 TFCI信息进行均分; 将均分后的各部分 TFCI信息扩展至与预设的星座图中至少一个指定能 量点的标识相对应;
将扩展后的各部分 TFCI信息映射至相应的能量点以进行调制。
2、 如权利要求 1 所述的方法, 其特征在于, 所述星座图用于调制 TFCI 信息, 且所述指定能量点不包含星座图中的最小功率点。
3、 如权利要求 1所述的方法, 其特征在于, 若所述指定能量点的数量大 于 1 , 则所有指定能量点均具有相同的功率。
4、 如权利要求 1所述的方法, 其特征在于, 所述指定能量点为星座图中 的最大功率点。
5、 如权利要求 4所述的方法, 其特征在于, 还包括: 将均分后的各部分 TFCI信息扩展至与预设的星座图中至少一个最小功率点的标识相对应;
其中, 在所述 TTI内以预设周期为单位对 TFCI信息进行扩展, 并且, 在 任意相邻的两个周期中的一个周期,将均分后的各部分 TFCI信息扩展至与最 大功率点的标识相对应, 在另一个周期, 将均分后的各部分 TFCI信息扩展至 与最小功率点的标识相对应。
6、 如权利要求 4所述的方法, 其特征在于, 若所述原 TFCI信息的数据 长度为 8bits,并且均分后的四部分 TFCI信息均不相同,则对所述四部分 TFCI 信息进行扩展后, 将其一一对应地映射到相应的最大功率点。
7、 如权利要求 1所述的方法, 其特征在于, 所述指定能量点为星座图中 的中间功率点, 所述中间功率点为星座图中不归属于最大功率点和最小功率 点的能量点。
8、 如权利要求 7所述的方法, 其特征在于, 所述中间功率点任意分布 在所迷星座图中的四个象限内。
9、 如权利要求 7所述的方法, 其特征在于, 所述中间功率点平均分布在 所述星座图中的四个象限内。
10、 如权利要求 8所述的方法, 其特征在于, 将所述中间功率点至少分 为两组;
在所述 TTI内以预设周期为单位对 TFCI信息进行扩展, 并且,在任意相 邻的至少两个周期内,将均分后的各部分 TFCI信息分别扩展至与每组中间功 率点的标识相对应。
11、 如权利要求 8所述的方法, 其特征在于, 若所述原 TFCI信息的数据 长度为 8bits,并且均分后的四部分 TFCI信息均不相同,则对所述四部分 TFCI 信息进行扩展后, 将其一一对应地映射到相应的中间功率点。
12、 如权利要求 1 - 11 任一项所述的方法, 其特征在于, 将每两个经过 调制的部分 TFCI信息分别放置在数据帧中相应的 Midamble码的两侧。
13、 如权利要求 1 - 11 任一项所述的方法, 其特征在于, 将每两个经过 调制的部分 TFCI信息分别放置在数据帧中相应的数据部分的两侧。
14、一种用于调制传输格式组合指示 TFCI信息的调制装置,其特征在于, 包括:
存储单元, 用于存储预设的星座图;
扩展单元,用于在传输时间间隔 TTI内,以 2bits为单位对获取的原 TFCI 信息进行均分,以及将均分后的各部分 TFCI信息扩展至与预设的星座图中至 少一个指定能量点的标识相对应;
调制单元, 用于将扩展后的各部分 TFCI信息映射至相应的能量点。
15、 如权利要求 14所述的调制装置, 其特征在于, 所述扩展单元进一步 包括:
第一确定单元, 用于确定指定能量点为星座图中的最大功率点; 第一处理单元,用于将均分后的各部分 TFCI信息扩展至与所述最大功率 点的标识相对应。
16、 如权利要求 15所述的调制装置, 其特征在于, 所述调制单元进一步 用于将扩展后的各部分 TFCI信息映射至相应的最大功率点。
17、 如权利要求 15所述的调制装置, 其特征在于, 所述扩展单元进一步 包括:
第二确定单元, 用于确定星座图中的最小功率点;
第二处理单元,用于将均分后的各部分 TFCI信息扩展至与所述最小功率 点的标识相对应;
其中, 在所述 TTI内以预设周期为单位对 TFCI信息进行 展, 并且, 在 任意相邻的两个周期中的一个周期, 所述第一处理单元将均分后的各部分 TFCI信息扩展至与最大功率点的标识相对应, 在另一个周期, 所述第二处理 单元将均分后的各部分 TFCI信息扩展至与最小功率点的标识相对应。
18、 如权利要求 17所述的调制装置, 其特征在于, 所述调制单元进一步 用于将扩展后的各部分 TFCI信息映射至相应的最大功率点或最小功率点。
19、 如权利要求 14所述的调制装置, 其特征在于, 所述扩展单元进一步 包括:
第三确定单元, 用于确定指定能量点为星座图中的中间功率点, 所述中 间功率点为不归属于所述星座图中的最大功率点和最小功率点的能量点; 第三处理单元,用于将均分后的各部分 TFCI信息扩展至与所述星座图中 的中间功率点的标识相对应。
20、 如权利要求 19所述的调制装置, 其特征在于, 所述第三处理单元将 确定的中间功率点至少分为两组;
其中, 在所述 TTI内以预设周期为单位对 TFCI信息进行扩展, 并且, 在 任意相邻的至少两个周期内,所述第三处理单元将均分后的各部分 TFCI信息 分别扩展至与每组中间功率点的标识相对应。
21、 如权利要求 19或 20所述的调制装置, 其特征在于, 所述调制单元 进一步用于将第三处理单元扩展后的各部分 TFCI信息映射至相应的中间功 率点。
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US8611461B2 (en) 2013-12-17
EP2180650B1 (en) 2013-10-30
CN101370160B (zh) 2011-12-21
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