WO2015081847A1 - 干扰抑制方法及装置 - Google Patents

干扰抑制方法及装置 Download PDF

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Publication number
WO2015081847A1
WO2015081847A1 PCT/CN2014/092802 CN2014092802W WO2015081847A1 WO 2015081847 A1 WO2015081847 A1 WO 2015081847A1 CN 2014092802 W CN2014092802 W CN 2014092802W WO 2015081847 A1 WO2015081847 A1 WO 2015081847A1
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Prior art keywords
receiving
matrix
transmitting end
transmitting
macro
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English (en)
French (fr)
Inventor
王雪松
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to EP14868379.0A priority Critical patent/EP3068059A4/en
Publication of WO2015081847A1 publication Critical patent/WO2015081847A1/zh
Priority to US15/171,757 priority patent/US9887748B2/en
Anticipated expiration legal-status Critical
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H04B1/50—Circuits using different frequencies for the two directions of communication
    • H04B1/52—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa
    • H04B1/525—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa with means for reducing leakage of transmitter signal into the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B15/00—Suppression or limitation of noise or interference
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B15/00—Suppression or limitation of noise or interference
    • H04B15/02—Reducing interference from electric apparatus by means located at or near the interfering apparatus

Definitions

  • the embodiments of the present invention relate to communication technologies, and in particular, to an interference suppression method and apparatus.
  • ACI inter-cell interference
  • the prior art adopts Opportunistic Interference Alignment (OIA) technology, so that the useful signal power received by the base station is as high as possible.
  • OFA Opportunistic Interference Alignment
  • the uplink transmission of the homogeneous network will be described as an example.
  • each base station presets its own receiving base vector, and each receiving base vector is used to determine a receiving subspace for receiving a signal transmitted by the user equipment of the local cell on the current time-frequency resource block; Receiving the power of the signal (ie, the interference signal) sent by the user equipments of the non-local cell, and transmitting the interference power information to other base stations, completing the exchange of the interference power information between the base stations, so as to realize the interference leakage of each base station to the user equipment of the local cell.
  • each base station may select a user equipment with the smallest interference leakage value from the user equipment of the local cell, and receive the signal sent by the selected user equipment in the receiving subspace, thereby implementing ACI in the uplink transmission process. Suppression.
  • the signal energy of the user equipment of the cell still partially leaks, resulting in a decrease in communication quality between the user equipment and the base station.
  • An embodiment of the present invention provides an interference suppression method and apparatus, which solves the problem that a base station receives a low signal efficiency of a user equipment of a base station by using an ACI, so as to implement a base station to efficiently receive a user equipment of the local cell.
  • the transmitted signal obtains a higher received signal to interference and noise ratio.
  • an embodiment of the present invention provides an interference suppression method, including:
  • a precoding matrix according to a channel fading matrix, wherein the channel fading matrix is an N ⁇ M dimensional matrix, where M is the number of antennas of the candidate device at the transmitting end, N is the number of antennas of the receiving device, and both M and N are positive integers.
  • M is the number of antennas of the candidate device at the transmitting end
  • N is the number of antennas of the receiving device
  • both M and N are positive integers.
  • Each element in the channel fading matrix is used to characterize channel fading of each antenna of the transmitting end candidate device to each antenna of the receiving end device;
  • Determining a receiving subspace according to the receiving base vector and receiving, in the receiving subspace, a signal sent by a selected device at a transmitting end, where the selected device at the transmitting end is a candidate device and a layer from the transmitting end A device selected in the pair that satisfies the preset interference leakage condition.
  • the determining a precoding matrix according to a channel fading matrix includes:
  • the precoding matrix is composed of min(M,N) right singular vectors corresponding to min(M,N) largest eigenvalues after the singular value decomposition A matrix, where min(M,N) represents the smaller of M and N.
  • the receiving and receiving are performed according to the precoding matrix, the signal power of the transmitting terminal candidate device, and the channel fading matrix of the signal to the receiving end device.
  • Base vector including:
  • the receiving matrix is The matrix of the feature vectors corresponding to the S largest eigenvalues.
  • the receiving end device includes a macro receiving end device and a micro receiving end device, and the transmitting end candidate device Including macro transmitter alternative device and micro transmitter alternative device;
  • the macro receiving end device determines, according to a preset rule, a preset number of macro transmitting end candidate devices and a layer number pair;
  • the receiving subspace is determined according to the receiving base vector
  • the method before receiving the signal sent by the selected device of the transmitting end in the receiving subspace, the method further includes:
  • calculating interference interference values of the candidate device and the layer number of the transmitting end including:
  • U m is a receiving matrix of the receiving device m
  • a superscript H indicates a conjugate transposition
  • k is a number of the transmitting terminal candidate device, 1 ⁇ k ⁇ (m)
  • t is the transmitting end device
  • the number of each column in the precoding matrix of the selected device that is, the number of spatially multiplexed min(M,N) layers, 1 ⁇ t ⁇ min(M,N), v k,t represents the kth transmission
  • the t-th column of the precoding matrix of the terminal candidate device, P k,t is the transmission power of the kth channel of the transmitting terminal candidate device on the tth layer of the space, and the channel fading matrix of the signal to the m path is H mk
  • IL k,t is the interference leakage value generated at the receiving end device not serving k when the transmitting device k transmits on the tth layer
  • ⁇ (k) is denoted as the receiving device of the k service ; Represents the
  • the method further includes:
  • the device that meets the preset interference leakage condition is selected as the transmitter-selected device.
  • the preset interference leakage condition includes:
  • the interference leakage value is minimum; or the preset interference leakage condition is a preset value, and the interference leakage value less than or equal to the preset value satisfies the preset interference leakage condition.
  • an interference suppression apparatus including:
  • a determining module configured to determine a precoding matrix according to a channel fading matrix, where the channel fading matrix is an N ⁇ M dimensional matrix, where M is the number of antennas of the candidate device at the transmitting end, and N is the number of antennas of the receiving device, M and N is a positive integer, and each element in the channel fading matrix is used to represent channel fading of each antenna of the transmitting terminal candidate device to each antenna of the receiving device;
  • An obtaining module configured to: according to the precoding matrix, a signal power of a transmitting end candidate device, and the Transmitting a base vector to a channel fading matrix of the receiving device;
  • a receiving module configured to determine a receiving subspace according to the receiving base vector, and receive, in the receiving subspace, a signal sent by a selected device at a transmitting end, where the selected device at the transmitting end is the transmitting end device from the transmitting end A device selected from the pair of candidate devices and the number of layers that meets the preset interference leakage conditions.
  • the determining module is specifically configured to:
  • the precoding matrix is composed of min(M,N) right singular vectors corresponding to min(M,N) largest eigenvalues after the singular value decomposition A matrix, where min(M,N) represents the smaller of M and N.
  • the acquiring module is specifically configured to:
  • the receiving matrix is The matrix of the feature vectors corresponding to the S largest eigenvalues.
  • the receiving end device includes a macro receiving end device and a micro receiving end device, where the transmitting end candidate device Including macro transmitter alternative device and micro transmitter alternative device;
  • the obtaining module includes:
  • a determining unit configured to determine, according to a preset rule, a preset number of macro transmitter candidate devices and a layer number pair;
  • a first acquiring unit configured to acquire a receiving base of the macro receiving end device according to a channel fading matrix of the macro transmitting end candidate device to the macro receiving end device and a precoding matrix corresponding to the macro transmitting end candidate device vector;
  • a second acquiring unit configured to acquire a receiving base of the micro receiving end device according to a channel fading matrix of the macro transmitting end candidate device to the micro receiving end device and a precoding matrix corresponding to the macro transmitting end candidate device vector.
  • the method further includes:
  • a calculation module configured to calculate an interference leakage value of the pair of devices and the number of layers of the transmitting end.
  • the calculating module is specifically configured to:
  • U m is a receiving matrix of the receiving device m
  • a superscript H indicates a conjugate transposition
  • k is a number of the transmitting terminal candidate device, 1 ⁇ k ⁇ (m)
  • t is the transmitting end device
  • the number of each column in the precoding matrix of the selected device that is, the number of spatially multiplexed min(M,N) layers, 1 ⁇ t ⁇ min(M,N), v k,t represents the kth transmission
  • the t-th column of the precoding matrix of the terminal candidate device, P k,t is the transmission power of the kth channel of the transmitting terminal candidate device on the tth layer of the space, and the channel fading matrix of the signal to the m path is H mk
  • IL k,t is the interference leakage value generated at the receiving end device not serving k when the transmitting device k transmits on the tth layer
  • ⁇ (k) is denoted as the receiving device of the k service ; Represents the
  • the method further includes:
  • a selection module configured to select, according to the calculated interference leakage value, a device that meets a preset interference leakage condition in the candidate device and the layer number of the transmitting end as the selected device of the transmitting end.
  • the preset interference leakage condition includes:
  • the interference leakage value is minimum; or the preset interference leakage condition is a preset value, and the interference leakage value less than or equal to the preset value satisfies the preset interference leakage condition.
  • the interference suppression method and apparatus can suppress the ACI, and realize that the receiving end device efficiently receives the signal sent by the selected device of the transmitting end of the cell, and can obtain a higher received signal to interference and noise ratio and a transmission rate.
  • Embodiment 1 is a flowchart of Embodiment 1 of an interference suppression method according to the present invention.
  • FIG. 2 is a diagram showing an example of a homogeneous network in an application scenario according to an embodiment of the present invention
  • FIG. 3 is a schematic diagram of a heterogeneous network in an application scenario according to an embodiment of the present invention.
  • Embodiment 4 is a flowchart of Embodiment 2 of an interference suppression method according to the present invention.
  • FIG. 5 is a schematic structural diagram of Embodiment 1 of an interference suppression apparatus according to the present invention.
  • FIG. 6 is a schematic structural diagram of Embodiment 2 of an interference suppression apparatus according to the present invention.
  • an interference suppression method provided by an embodiment of the present invention may be implemented by an interference suppression apparatus, and the apparatus may be implemented by software and/or hardware, and integrated in In a base station or user equipment.
  • the interference suppression method provided in this embodiment includes:
  • Step 101 Determine a precoding matrix according to a channel fading matrix.
  • the channel fading matrix is an N ⁇ M-dimensional matrix, where M is the number of antennas of the candidate device at the transmitting end, N is the number of antennas of the receiving device, and M and N are positive integers, and each element in the channel fading matrix is used. And characterization of channel fading of each antenna of the transmitting terminal candidate device to a signal of each antenna of the base station.
  • the transmitting terminal candidate device when the base station is used as the receiving end device, includes the user equipment served by the base station itself, that is, the user equipment of the local cell and the user equipment of the neighboring cell; when the user equipment is used as the receiving end device,
  • the transmitting end candidate device includes a base station serving the range of the user equipment itself, and a neighboring cell base station.
  • each of the transmitting end candidate devices corresponds to one precoding matrix.
  • the precoding matrix is determined by the base station according to the channel fading matrix obtained by the channel estimation, and the base station sends the precoding matrix to the corresponding user equipment, and the signal to be sent by the user equipment is performed by the base station. Pre-processing to facilitate signal detection after receiving by the base station.
  • Step 102 Acquire a receiving base vector according to the precoding matrix, the signal power of the transmitting terminal candidate device, and the channel fading matrix of the signal to the receiving end device.
  • each receiving end device first needs to determine the receiving base vector, but unlike the prior art, the receiving base vector of the receiving end device in the present invention is not randomly selected, and the receiving base vector and the transmitting are also considered.
  • the matching of the signals sent by the terminal candidate device causes the signal transmitted by the transmitting terminal candidate device to fall as much as possible in the receiving subspace formed by the receiving base vector.
  • CSI channel state information
  • precoding matrix precoding matrix
  • receiving base vector affect the transmission rate of the signal
  • the base vector and the received signal are received.
  • the numbers are matched, it is advantageous to obtain a higher transmission rate.
  • Step 103 Determine a receiving subspace according to the receiving base vector, and receive a signal sent by the selected device at the transmitting end in the receiving subspace.
  • the selected device at the transmitting end is a device that meets a preset interference leakage condition selected by the receiving end device from the transmitting terminal candidate device and the number of layers, and the preset interference leakage condition may be the smallest interference leakage value and the minimum interference leakage value.
  • the selected device and the layer number of the transmitting end are selected as the transmitting end; or, the preset interference leakage condition is a preset value, and the interference leakage value whose interference leakage value is less than or equal to the preset value satisfies the preset interference leakage.
  • the transmitting end candidate device and the layer number pair satisfying the preset interference leakage condition are selected as the transmitting end device.
  • each transmitting end candidate device can spatially multiplex the min(M,N) layer at most, where min represents the magnitude of the comparison values M and N, and takes a smaller value.
  • the number of multiplexing layers of the transmitting end candidate device for example, t indicates that a certain transmitting end candidate device k spatially multiplexes any one of the min(M, N) layers, then (k, t) represents The transmitting end candidate device and the layer number pair, indicating that k transmits a signal to the corresponding receiving end device on the tth layer.
  • the receiving end device for example, the base station, notifies the determined precoding matrix to the corresponding device selected by the transmitting end, and the selected device at the transmitting end uses the corresponding precoding matrix to transmit the signal; after receiving the signal, the base station adopts the signal.
  • Various conventional linear detection algorithms recover the transmitted data of the selected device of the served transmitter.
  • the interference suppression method provided by the embodiment of the present invention can suppress the ACI, and avoid the receiving device, for example, the base station (Base Station, BS), and the receiving device selected by the transmitting device, for example, the user equipment (User Equipment, referred to as: UE), the problem of low signal efficiency, so that the receiving end device can efficiently receive the signal sent by the selected device of the transmitting end of the cell, and obtain a higher received signal to interference and noise ratio and a transmission rate.
  • the receiving end device for example, the base station (Base Station, BS)
  • UE User Equipment
  • the interference suppression method provided in this embodiment may be applied to a homogeneous network or a heterogeneous network, where the homogeneous network includes a Macro Site (MBS) and a Macro User Equipment (MUE);
  • the heterogeneous network includes an MBS, a MUE, a Pico Site (PBS), and a Pico User Equipment (PUE).
  • the macro base station has higher high power and smaller coverage; the micro base station has lower power and smaller coverage.
  • Each base station provides access services to several users.
  • the base station is used as the receiving end device, and the user equipment is used as the transmitting end candidate device and the transmitting end selecting device.
  • the user equipment serves as the receiving end device, and
  • the base station is used as the candidate device of the transmitting end and the selected device of the transmitting end.
  • the method principle and implementation manner are similar in the two scenarios.
  • the homogeneous structure includes macro user equipments MUE 1 , MUE 2 , . . . , MUE 9 and MUE 10 , and macro base stations MBS 1 , MBS 2 and MBS 3 .
  • MUE 1 , MUE 2 , . . . , MUE 9 and MUE 10 macro base stations
  • MBS 1 , MBS 2 and MBS 3 macro base stations
  • the isomorphic structure may include multiple MUEs or MBSs, and is not limited to the number in this embodiment.
  • the present embodiment is described by taking a macro base station m and a macro user equipment k as an example.
  • the macro base station m is any one of the macro user equipments shown in FIG.
  • the macro user equipment k is the macro base shown in FIG. 2. Any one of the stations. As shown in FIG. 2, the range of service of each base station is a dotted line range centered on the geographical location where the base station is located, taking MBS 1 as an example, the service range covers MUE 2 and MUE 5 , and MUE 1 and MUE 8 are served in MBS 1 Edge zone.
  • the present embodiment details the determination of the precoding matrix according to the channel fading matrix in step 101.
  • the base station is equipped with N antennas, and the user equipment is equipped with an antenna.
  • the channel On the current time-frequency resource block, the channel is considered to be flat fading, and the user equipment 1 transmits the signal x l to the base station m serving itself with the power P l .
  • the channel fading experienced by the transmitted signal to the base station m is recorded as H lm , and the channel fading is obtained according to the channel estimation.
  • H lm is an N ⁇ 1 dimensional vector; and A is defined as a current time-frequency resource block.
  • n m represents the noise vector at the base station m.
  • the transmitting end candidate device is the user equipment, and the receiving end device is the base station
  • the difference between the present invention and the prior art is that the transmitting end candidate device is equipped with M antennas.
  • each transmitting terminal candidate device can spatially multiplex the min(M,N) layer at most, wherein min represents the size of the comparison values M and N, The smaller number of multiplex layers as the candidate for the transmitting end.
  • P k,t is the transmission power of the kth transmitting terminal candidate device on the tth layer of the space, and the channel fading matrix of the signal to the m path is H mk .
  • the kth transmitting end candidate device transmits a signal x k,t to the base station m serving itself for the power P k,t on the tth layer of the space, corresponding to the tth column v k,t of the precoding matrix, the present invention
  • the signal received by the base station m can be expressed as:
  • the multi-antenna transmitting end candidate device first pre-codes the signal to be transmitted using the pre-coding matrix before transmitting the signal, wherein the pre-encoding matrix is obtained according to the channel estimation. Determining, by the channel fading matrix, the singular value decomposition of the channel fading matrix, wherein the precoding matrix is min(M, corresponding to min(M, N) largest eigenvalues after the singular value decomposition. N) A matrix of right singular vectors, where min(M,N) represents the smaller of M and N.
  • the precoding matrix is generated as follows:
  • the base station obtains, according to the channel estimation, the channel fading matrix that the user equipment it serves to itself, for example, the channel fading matrix H mk experienced by the transmitting terminal candidate device k to the base station m served by it, and performs singular value decomposition on H mk (Singular Value Decomposition, SVD for short):
  • U mk is an M ⁇ M ⁇ matrix
  • V mk is an N ⁇ N ⁇ matrix
  • the superscript H represents a matrix conjugate transpose operation
  • ⁇ mk is an M ⁇ N diagonal matrix
  • the main diagonal element is H
  • the singular value of mk is constructed without loss of generality, and the singular values are arranged in descending order.
  • the t-th column vector v k,t of V mk is the right singular vector corresponding to the t-th largest singular value of H mk , and is One.
  • step 102 according to the precoding matrix, the signal power of the transmitting terminal candidate device, and the signal to The channel fading matrix of the receiving device obtains the receiving base vector, which can be implemented by:
  • the sum of the useful signals in the signal transmitted by the transmitting terminal candidate device k in the cell received by the base station is Obtaining a receiving matrix according to the following formula, using each column vector in the receiving matrix as the receiving base vector:
  • U m is the receiving matrix; Indicates that the value of U is the value of U m when the value of the partial value in [] is the largest; U is the complex matrix of N ⁇ S dimension, and S represents the number of streams of the signal stream that the receiving device needs to receive;
  • the standard H represents conjugate transposition; I is a unit vector; Indicates that the F-norm is calculated for U H H mk v k,t ; ⁇ (m) represents the set of user equipment served by m; ⁇ represents the summation calculation.
  • the U that takes the maximum value of the left and right parts in equation (5) should be a matrix.
  • a matrix composed of s feature vectors corresponding to the S largest eigenvalues the matrix is used as a receiving matrix of the base station, and each column vector is used as a receiving basis vector of each antenna of the base station, where S is a set ⁇ (m) ⁇ A
  • S is a set ⁇ (m) ⁇
  • the number of elements in the medium that is, the number of streams of the signal stream that the base station m needs to receive at the same time. It is assumed that at the current time-frequency resource block, at most the S ⁇ N signal streams are transmitted between the base station and the user equipment it serves.
  • the method may further include: calculating the candidate device and the number of layers in the transmitting end The interference leakage value of the pair.
  • the interference leakage value of the pair of devices and the number of layers of the transmitting end is calculated.
  • the interference leakage value generated by the transmitting terminal candidate device k on the t-th space layer is calculated according to the following formula:
  • U m is a receiving matrix of the receiving device m
  • a superscript H indicates a conjugate transposition
  • k is a number of the transmitting terminal candidate device, 1 ⁇ k ⁇ (m)
  • t is the transmitting end device
  • the number of each column in the precoding matrix of the selected device that is, the number of spatially multiplexed min(M,N) layers, 1 ⁇ t ⁇ min(M,N), v k,t represents the kth transmission
  • the t-th column of the precoding matrix of the terminal candidate device, P k,t is the transmission power of the kth channel of the transmitting terminal candidate device on the tth layer of the space, and the channel fading matrix of the signal to the m path is H mk
  • IL k,t is the interference leakage value generated at the receiving end device not serving k when the transmitting device k transmits on the tth layer
  • ⁇ (k) is denoted as the receiving device of the k service ; Represents the
  • the base stations After the base station acquires the interference leakage value generated by each of the transmitting terminal candidate devices on any layer of the min (M, N) layer, the base stations exchange interference interference values of the transmitting terminal candidate devices with each other, so that the base stations acquire Interference leakage value for each transmitter-selected device. Finally, the base station traverses all the transmitter-selected devices and layer pairs (k, t) served by the base station, and selects the candidate interference device and the number of layers in the transmitter to meet the preset interference leakage condition according to the calculated interference leakage value. The device is selected as the transmitting device, and the signal transmitted by the selected device at the transmitting end is received in the receiving subspace determined by the receiving base vector.
  • the interference suppression method provided by the embodiment of the present invention achieves ACI suppression by acquiring the receiving base vector matched by the transmitting side transmitting signal and selecting the device satisfying the preset interference leakage condition in the transmitting terminal candidate device. Compared with the technology, the received signal to interference and noise ratio of the signal of the cell is improved, which is advantageous for obtaining a higher transmission rate. Meanwhile, the multiple input multiple output (MIMO) scenario in which the user equipment is equipped with multiple antennas is considered.
  • the interference suppression method provided by the embodiment of the present invention is applicable to a multi-antenna scenario.
  • FIG. 3 is a schematic diagram of a heterogeneous network in an application scenario according to an embodiment of the present invention.
  • the heterogeneous structure includes a macro base station MBS, a micro base station PBS 1 , a PBS 2, and a PBS 3 , and a macro user equipment and a micro user equipment, which are collectively represented as UE 1 , UE 2 , ..., UE 9 .
  • UE 10 .
  • the heterogeneous structure may include multiple UEs, PBSs, or MBSs, and is not limited to the number in this embodiment.
  • the receiving end device includes a macro receiving end device and a micro receiving end device
  • the transmitting end candidate device includes a macro transmitting end candidate device and a micro transmitting end candidate device.
  • the macro receiving end device is a macro base station
  • the micro receiving end device is a micro base station
  • the macro transmitting end candidate device is a macro user equipment
  • the micro transmitting end optional device is a micro user equipment.
  • the micro base station is transparent to the macro base station, that is, the transmission between the macro base station and the macro user equipment does not consider the existence of the micro base station and the micro user equipment at all, so
  • the inter-layer interference should be eliminated, that is, the interference of the micro-user equipment to the macro user equipment and the interference of the macro user equipment to the micro-base station; afterwards, the intra-layer interference, that is, the interference of the micro-user equipment to the non-serving micro base station, is eliminated.
  • the specific implementation process of this embodiment is as follows:
  • Step 401 Determine a precoding matrix according to a channel fading matrix.
  • This step can be referred to the step 101 in the foregoing embodiment, and is not described in this embodiment.
  • Step 402 The macro base station determines a preset number of macro user equipments according to a preset rule.
  • the macro base station selects a preset number of macro user equipments and layer pairs (k, t) according to some preset criteria, wherein the preset rules and the preset number can be set according to requirements, and are not limited herein.
  • Record the selected macro user device and layer number as among them Represents S m macro user devices, Respectively multiplexed min (M, N) layer on the numbers m spatial macro user equipment S.
  • Step 403 The macro base station acquires a receiving base vector of the macro base station according to a channel fading matrix of the macro user equipment to the macro base station and a precoding matrix corresponding to the macro user equipment.
  • the S m macro user equipments selected in step 402 will fall in the receiving subspace. Medium, among them, Indicates the selected macro user device The channel fading matrix experienced by the macro base station MBS, i between 1 and S m ; Solving the receiving base vector of the macro base station, for example, Schmitt orthogonalization can be performed on the matrix to obtain S m orthogonal normalized N-dimensional vectors as the receiving base vector B MBS of the macro base station, and other Means, for example, solving a system of equations, etc., to obtain a reception basis vector B MBS .
  • Step 404 The micro base station acquires a receiving base vector of the micro base station according to a channel fading matrix of the macro user equipment to the micro base station and a precoding matrix corresponding to the macro user equipment.
  • the base vector, the sum of S m and S P is less than or equal to N.
  • Steps 402 to 404 are further refinement of step 102, and there is no timing relationship between step 404 and step 402 and step 403.
  • Step 404 may be performed in parallel with step 402 or step 403, or may be performed sequentially.
  • Step 405 Calculate an interference leakage value of the pair of devices and the number of layers of the transmitting end.
  • the transmitting end candidate device includes a macro user device and a micro user device.
  • the interference leakage values of the micro-user equipment and the macro user equipment that is, UE 1 , UE 2 , ..., UE 9 and UE 10 shown in FIG. 3 are respectively calculated.
  • Step 406 Select, according to the calculated interference leakage value, a device that meets the preset interference leakage condition in the candidate device and the layer number of the transmitting end as the selected device of the transmitting end.
  • the preset interference leakage condition includes: the interference leakage value is minimum; or the preset interference leakage condition is a preset value, and the interference leakage value less than or equal to the preset value satisfies the preset interference leakage. condition.
  • Step 407 Determine a receiving subspace according to the receiving base vector, and receive a signal sent by the selected device at the transmitting end in the receiving subspace.
  • This step can be referred to the step 103 in the foregoing embodiment, and is not described in this embodiment.
  • the interference suppression method in the embodiment of the present invention considers the selection of the base vector of the macro base station in the heterogeneous network, and the MIMO scene in which the candidate device of the transmitting end is equipped with multiple antennas, and improves the receiving signal of the signal of the local cell compared with the prior art.
  • the noise ratio is advantageous for obtaining a higher transmission rate
  • the interference suppression method provided by the present invention is also applicable to a multi-antenna scene.
  • the technical solution in the heterogeneous network given in this embodiment makes the micro base station and the micro user equipment completely transparent to the macro base station, that is, the macro base station can ignore the existence of the micro base station and the micro user equipment, thereby making the arrangement of the micro base station. It is not necessary to coordinate with the macro base station, which reduces the difficulty of the heterogeneous network deployment.
  • FIG. 5 is a schematic structural diagram of Embodiment 1 of an interference suppression apparatus according to the present invention.
  • the apparatus in this embodiment may be integrated in a base station or a user equipment.
  • the apparatus in this embodiment includes a determining module 51, an obtaining module 52, and receiving. Module 53.
  • the determining module 51 is configured to determine a precoding matrix according to a channel fading matrix, where the channel fading matrix is an N ⁇ M dimension matrix, where M is the number of antennas of the candidate device at the transmitting end, and N is the number of antennas of the receiving device.
  • M and N are both positive integers, and each element in the channel fading matrix is used to characterize channel fading of each antenna of the transmitting terminal candidate device to each antenna of the receiving device;
  • the obtaining module 52 is configured to a precoding matrix, a signal power of the transmitting end candidate device, and a channel fading matrix of the signal to the receiving end device to obtain a receiving base vector;
  • the receiving module 53 is configured to determine a receiving subspace according to the receiving base vector, and The receiving subspace receives a signal sent by the selected device at the transmitting end, and the selected device at the transmitting end is a device that meets the preset interference leakage condition selected by the receiving end device from the transmitting terminal candidate device and the layer number pair.
  • the interference suppression device of this embodiment can be used in the technical solution of the embodiment of the interference suppression method, and the implementation principle and the technical effect are similar, and details are not described herein again.
  • the determining module 51 may be specifically configured to: perform singular value decomposition on the channel fading matrix, where the precoding matrix is min(M, N) largest eigenvalues after the singular value decomposition A matrix consisting of min(M,N) right singular vectors, where min(M,N) represents the smaller of M and N.
  • the obtaining module 52 may be specifically configured to: according to the precoding matrix, the signal power of the transmitting terminal candidate device, and the channel fading matrix of the signal to the receiving end device, obtain The receive matrix of the expression shown below is used as the receive base vector:
  • the receiving matrix can be The matrix composed of the feature vectors corresponding to the S largest eigenvalues can also be obtained by other means.
  • the receiving end device may include a macro receiving end device and a micro receiving end device
  • the transmitting end candidate device may include a macro transmitting end candidate device and a micro transmitting end candidate device.
  • the macro base station is used as the macro receiving end device
  • the micro base station is used as the micro receiving end device
  • the macro user equipment is used as the macro transmitting end candidate device
  • the micro user device is used as the micro transmitting end candidate device.
  • FIG. 6 is a schematic structural diagram of Embodiment 2 of the interference suppression apparatus according to the present invention.
  • the obtaining module 52 may include:
  • the determining unit 521 is configured to determine, according to a preset rule, a preset number of macro transmitting end candidate devices and a layer number pair; the first obtaining unit 522 is configured to: according to the channel fading matrix of the macro transmitting end candidate device to the macro receiving end device And a precoding matrix corresponding to the macro transmitter candidate device, acquiring the macro receiving end a receiving base vector; the second obtaining unit 523 is configured to acquire the micro according to a channel fading matrix of the macro transmitting end candidate device to the micro receiving end device and a precoding matrix corresponding to the macro transmitting end candidate device The receiving base vector of the receiving device.
  • the device in this embodiment is used to implement the technical solution of the method embodiment shown in FIG. 4, and the implementation principle and technical effects are similar, and details are not described herein again.
  • the interference suppression apparatus in this embodiment may further include: the calculation module 61 is configured to calculate an interference leakage value of the pair of devices and the number of layers of the transmitting end.
  • U m is a receiving matrix of the receiving device m
  • a superscript H indicates a conjugate transposition
  • k is a number of the transmitting terminal candidate device, 1 ⁇ k ⁇ (m)
  • t is the transmitting end device
  • the number of each column in the precoding matrix of the selected device that is, the number of spatially multiplexed min(M,N) layers, 1 ⁇ t ⁇ min(M,N), v k,t represents the kth transmission
  • the t-th column of the precoding matrix of the terminal candidate device, P k,t is the transmission power of the kth channel of the transmitting terminal candidate device on the tth layer of the space, and the channel fading matrix of the signal to the m path is H mk
  • IL k,t is the interference leakage value generated at the receiving end device not serving k when the transmitting device k transmits on the tth layer
  • ⁇ (k) is denoted as the receiving device of the k service ; Represents the
  • the interference suppression device may further include: a selection module 62, configured to select, according to the calculated interference leakage value, a device that meets a preset interference leakage condition in the pair of candidate devices and the number of layers in the transmitting end as the transmitting end Equipment.
  • the preset interference leakage condition may include: the interference leakage value is minimum; or the preset interference leakage condition is a preset value, and the interference leakage value less than or equal to the preset value is all satisfying the preset interference. Leakage conditions.
  • the interference suppression apparatus in the embodiment of the present invention considers the selection of the base vector of the macro base station in the heterogeneous network, and the MIMO scene in which the candidate device of the transmitting end is equipped with multiple antennas, and improves the receiving signal of the signal of the local cell compared with the prior art. Noise ratio, which is advantageous for obtaining a higher transmission rate, and also makes the present invention
  • the interference suppression method provided is applicable to a multi-antenna scene.
  • the technical solution in the heterogeneous network given in this embodiment makes the micro base station and the micro user equipment completely transparent to the macro base station, that is, the macro base station can ignore the existence of the micro base station and the micro user equipment, thereby making the arrangement of the micro base station. It is not necessary to coordinate with the macro base station, which reduces the difficulty of the heterogeneous network deployment.
  • the aforementioned program can be stored in a computer readable storage medium.
  • the program when executed, performs the steps including the foregoing method embodiments; and the foregoing storage medium includes various media that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

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Abstract

本发明实施例提供一种干扰抑制方法及装置。该方法包括：根据信道衰落矩阵确定预编码矩阵，信道衰落矩阵为N×M维矩阵，M为发射端备选设备天线根数，N为接收端设备天线根数，信道衰落矩阵内各元素表征发射端备选设备各天线发射信号到接收端设备各天线的信道衰落；根据预编码矩阵、发射端备选设备的信号功率及信号到接收端设备的信道衰落矩阵获取接收基向量；根据接收基向量确定接收子空间，并在接收子空间中接收发射端选定设备发送的信号，发射端选定设备为接收端设备从发射端备选设备与层数对中选取的满足预设干扰泄漏条件的设备。

Description

干扰抑制方法及装置
本申请要求于2013年12月2日提交中国专利局、申请号为201310637099.1、发明名称为“干扰抑制方法及装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本发明实施例涉及通信技术，尤其涉及一种干扰抑制方法及装置。
背景技术
在小区边缘，同时存在着来自于本小区和邻近小区的信号。来自相邻小区的信号对本小区构成小区间干扰(Adjacent Cell Interference，简称：ACI)，从而严重影响通信质量。
为抑制ACI，现有技术采用机会干扰对齐(Opportunistic Interference Alignment，简称：OIA)技术，使得基站接收的有用信号功率尽可能地高。在这里，以同构网络的上行传输为例进行说明。在上行传输过程中，各基站预先设置自身的接收基向量，各接收基向量用于确定接收本小区用户设备在当前时频资源块上发送来的信号的接收子空间；同时，计算本基站所接收的各非本小区用户设备发送的信号(即干扰信号)功率，并将这些干扰功率信息发送给其它基站，完成各基站间干扰功率信息的互换，以实现各基站对本小区用户设备干扰泄漏值的获取；之后，各基站可以从本小区用户设备中选择干扰泄漏值最小的用户设备，在接收子空间中对选择的用户设备所发送的信号进行接收，从而实现在上行传输过程中对ACI的抑制。
该现有技术中，本小区用户设备的信号能量仍然会有部分泄露，导致用户设备与基站间通信质量的降低。
发明内容
本发明实施例提供一种干扰抑制方法及装置，解决由于ACI导致基站接收本基站用户设备的信号效率低的问题，以实现基站高效接收本小区用户设备 发送的信号，获得较高的接收信干噪比。
第一方面，本发明实施例提供一种干扰抑制方法，包括：
根据信道衰落矩阵确定预编码矩阵，所述信道衰落矩阵为N×M维矩阵，其中，M为发射端备选设备天线根数，N为接收端设备天线根数，M和N均为正整数，所述信道衰落矩阵内各元素用于表征所述发射端备选设备各天线发射信号到所述接收端设备各天线的信道衰落；
根据所述预编码矩阵、发射端备选设备的信号功率及所述信号到所述接收端设备的信道衰落矩阵获取接收基向量；
根据所述接收基向量确定接收子空间，并在所述接收子空间中接收发射端选定设备发送的信号，所述发射端选定设备为所述接收端设备从发射端备选设备与层数对中选取的满足预设干扰泄漏条件的设备。
结合第一方面，在第一方面的第一种可能的实现方式中，所述根据信道衰落矩阵确定预编码矩阵，包括：
对所述信道衰落矩阵进行奇异值分解，则所述预编码矩阵为所述奇异值分解后的min(M,N)个最大的特征值对应的min(M,N)个右奇异向量组成的矩阵，其中，min(M,N)表示取M和N中较小的值。
结合第一方面，在第一方面的第二种可能的实现方式中，根据所述预编码矩阵、发射端备选设备的信号功率及所述信号到所述接收端设备的信道衰落矩阵获取接收基向量，包括：
根据所述预编码矩阵、发射端备选设备的信号功率及所述信号到所述接收端设备的信道衰落矩阵，获取满足如下所示表达式的接收矩阵作为接收基向量：
Figure PCTCN2014092802-appb-000001
其中，U是N×S维的复矩阵，S表示所述接收端设备需要接收的信号流的流数；上标H表示共轭转置；
Figure PCTCN2014092802-appb-000002
表示在所有满足条件UHU＝I的U中求所述矩阵函数最大值，I为单位矩阵；arg表示求所述矩阵函数取得最大值时对应的自变量值Um；k为所述发射端备选设备的编号，1≤k≤μ(m)，t为所述发射 端备选设备的预编码矩阵中各列的编号，即空间上复用的min(M,N)层的编号，1≤t≤min(M,N)，μ(m)表示m所服务的发射端备选设备的集合，A＝{(k,t):1≤k≤μ(m),1≤t≤min(M,N)}表示所有可能的发射端备选设备与层数对的集合；vk,t表示第k个所述发射端备选设备的预编码矩阵的第t列，Pk,t为第k个所述发射端备选设备在空间的第t层上的发送功率，所述信号到m途经的信道衰落矩阵为Hmk；Σ表示求和计算。
结合第一方面的第二种可能的实现方式，在第一方面的第三种可能的实现方式中，所述接收矩阵为
Figure PCTCN2014092802-appb-000003
的S个最大的特征值对应的特征向量组成的矩阵。
结合第一方面的第一种可能的实现方式，在第一方面的第四种可能的实现方式中，所述接收端设备包括宏接收端设备和微接收端设备，所述发射端备选设备包括宏发射端备选设备和微发射端备选设备；
则根据所述预编码矩阵、发射端备选设备的信号功率及所述信号到所述基站的信道衰落矩阵获取接收基向量，包括：
宏接收端设备根据预设规则确定预设数量的宏发射端备选设备与层数对；
所述宏接收端设备根据所述宏发射端备选设备到宏接收端设备的信道衰落矩阵和所述宏发射端备选设备对应的预编码矩阵，获取所述宏接收端设备的接收基向量；
所述微接收端设备根据所述宏发射端备选设备到微接收端设备的信道衰落矩阵和所述宏发射端备选设备对应的预编码矩阵，获取所述微接收端设备的接收基向量。
结合第一方面、第一方面的第一种至第四种可能的实现方式中的任意一种，在第一方面的第五种可能的实现方式中，根据所述接收基向量确定接收子空间，并在所述接收子空间中接收发射端选定设备发送的信号之前，还包括：
计算所述发射端备选设备与层数对的干扰泄漏值。
结合第一方面的第五种可能的实现方式，在第一方面的第六种可能的实现 方式中，计算所述发射端备选设备与层数对的干扰泄漏值，包括：
根据如下式子计算所述发射端备选设备在第t空间层上传输产生的干扰泄漏值：
Figure PCTCN2014092802-appb-000004
其中，Um为接收端设备m的接收矩阵，上标H表示共轭转置；k为所述发射端备选设备的编号，1≤k≤μ(m)，t为所述发射端备选设备的预编码矩阵中各列的编号，即空间上复用的min(M,N)层的编号，1≤t≤min(M,N)，vk,t表示第k个所述发射端备选设备的预编码矩阵的第t列，Pk,t为第k个所述发射端备选设备在空间的第t层上的发送功率，所述信号到m途径的信道衰落矩阵为Hmk；ILk,t为当发射端设备k在第t层上传输时，在各不为k服务的接收端设备处产生的干扰泄漏值；β(k)表示为k服务的接收端设备；
Figure PCTCN2014092802-appb-000005
表示对UHHmkvk,t计算F-范数；Σ表示求和计算。
结合第一方面的第六种可能的实现方式，在第一方面的第七种可能的实现方式中，计算所述发射端备选设备与层数对的干扰泄漏值之后，还包括：
根据计算得到的所述干扰泄漏值，选取发射端备选设备与层数对中满足预设干扰泄漏条件的设备作为发射端选定设备。
结合第一方面的第七种可能的实现方式，在第一方面的第八种可能的实现方式中，所述预设干扰泄漏条件包括：
干扰泄漏值最小；或所述预设干扰泄漏条件为一预设值，小于等于所述预设值的干扰泄漏值均为满足所述预设干扰泄漏条件。
第二方面，本发明实施例提供一种干扰抑制装置，包括：
确定模块，用于根据信道衰落矩阵确定预编码矩阵，所述信道衰落矩阵为N×M维矩阵，其中，M为发射端备选设备天线根数，N为接收端设备天线根数，M和N均为正整数，所述信道衰落矩阵内各元素用于表征所述发射端备选设备各天线发射信号到所述接收端设备各天线的信道衰落；
获取模块，用于根据所述预编码矩阵、发射端备选设备的信号功率及所述 信号到所述接收端设备的信道衰落矩阵获取接收基向量；
接收模块，用于根据所述接收基向量确定接收子空间，并在所述接收子空间中接收发射端选定设备发送的信号，所述发射端选定设备为所述接收端设备从发射端备选设备与层数对中选取的满足预设干扰泄漏条件的设备。
结合第二方面，在第二方面的第一种可能的实现方式中，所述确定模块具体用于：
对所述信道衰落矩阵进行奇异值分解，则所述预编码矩阵为所述奇异值分解后的min(M,N)个最大的特征值对应的min(M,N)个右奇异向量组成的矩阵，其中，min(M,N)表示取M和N中较小的值。
结合第二方面，在第二方面的第二种可能的实现方式中，所述获取模块具体用于：
根据所述预编码矩阵、发射端备选设备的信号功率及所述信号到所述接收端设备的信道衰落矩阵，获取满足如下所示表达式的接收矩阵作为接收基向量：
Figure PCTCN2014092802-appb-000006
其中，U是N×S维的复矩阵，S表示所述接收端设备需要接收的信号流的流数；上标H表示共轭转置；
Figure PCTCN2014092802-appb-000007
表示在所有满足条件UHU＝I的U中求所述矩阵函数最大值，I为单位矩阵；arg表示求所述矩阵函数取得最大值时对应的自变量值Um；k为所述发射端备选设备的编号，1≤k≤μ(m)，t为所述发射端备选设备的预编码矩阵中各列的编号，即空间上复用的min(M,N)层的编号，1≤t≤min(M,N)，μ(m)表示m所服务的发射端备选设备的集合，A＝{(k,t):1≤k≤μ(m),1≤t≤min(M,N)}表示所有可能的发射端备选设备与层数对的集合；vk,t表示第k个所述发射端备选设备的预编码矩阵的第t列，Pk,t为第k个所述发射端备选设备在空间的第t层上的发送功率，所述信号到m途经的信道衰落矩阵为Hmk；Σ表示求和计算。
结合第二方面的第二种可能的实现方式，在第二方面的第三种可能的实现方式中，所述接收矩阵为
Figure PCTCN2014092802-appb-000008
的S个最大的特征值对应的特征向量组成的矩阵。
结合第二方面的第一种可能的实现方式，在第二方面的第四种可能的实现方式中，所述接收端设备包括宏接收端设备和微接收端设备，所述发射端备选设备包括宏发射端备选设备和微发射端备选设备；
则所述获取模块包括：
确定单元，用于根据预设规则确定预设数量的宏发射端备选设备与层数对；
第一获取单元，用于根据所述宏发射端备选设备到宏接收端设备的信道衰落矩阵和所述宏发射端备选设备对应的预编码矩阵，获取所述宏接收端设备的接收基向量；
第二获取单元，用于根据所述宏发射端备选设备到微接收端设备的信道衰落矩阵和所述宏发射端备选设备对应的预编码矩阵，获取所述微接收端设备的接收基向量。
结合第二方面、第二方面的第一种至第四种可能的实现方式中的任意一种，在第二方面的第五种可能的实现方式中，还包括：
计算模块，用于计算所述发射端备选设备与层数对的干扰泄漏值。
结合第二方面的第五种可能的实现方式，在第二方面的第六种可能的实现方式中，所述计算模块具体用于：
根据如下式子计算所述发射端备选设备在第t空间层上传输产生的干扰泄漏值：
Figure PCTCN2014092802-appb-000009
其中，Um为接收端设备m的接收矩阵，上标H表示共轭转置；k为所述发射端备选设备的编号，1≤k≤μ(m)，t为所述发射端备选设备的预编码矩阵中各列的编号，即空间上复用的min(M,N)层的编号，1≤t≤min(M,N)，vk,t表示 第k个所述发射端备选设备的预编码矩阵的第t列，Pk,t为第k个所述发射端备选设备在空间的第t层上的发送功率，所述信号到m途径的信道衰落矩阵为Hmk；ILk,t为当发射端设备k在第t层上传输时，在各不为k服务的接收端设备处产生的干扰泄漏值；β(k)表示为k服务的接收端设备；
Figure PCTCN2014092802-appb-000010
表示对UHHmkvk,t计算F-范数；Σ表示求和计算。
结合第二方面的第六种可能的实现方式，在第二方面的第七种可能的实现方式中，还包括：
选择模块，用于根据计算得到的所述干扰泄漏值，选取发射端备选设备与层数对中满足预设干扰泄漏条件的设备作为发射端选定设备。
结合第二方面的第七种可能的实现方式，在第二方面的第八种可能的实现方式中，所述预设干扰泄漏条件包括：
干扰泄漏值最小；或所述预设干扰泄漏条件为一预设值，小于等于所述预设值的干扰泄漏值均为满足所述预设干扰泄漏条件。
本发明实施例提供的干扰抑制方法及装置，可以抑制ACI，实现了接收端设备高效接收本小区发射端选定设备发送的信号，并可获得较高的接收信干噪比及传输速率。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作一简单地介绍，显而易见地，下面描述中的附图是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动性的前提下，还可以根据这些附图获得其他的附图。
图1为本发明干扰抑制方法实施例一的流程图；
图2为本发明实施例应用场景中同构网络的示例图；
图3为本发明实施例应用场景中异构网络的示例图；
图4为本发明干扰抑制方法实施例二的流程图；
图5为本发明干扰抑制装置实施例一的结构示意图；
图6为本发明干扰抑制装置实施例二的结构示意图。
具体实施方式
为使本发明实施例的目的、技术方案和优点更加清楚，下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
图1为本发明干扰抑制方法实施例一的流程图，如图1所示，本发明实施例提供的干扰抑制方法可以由干扰抑制装置执行，该装置可以通过软件和/或硬件实现，集成在基站或用户设备中。本实施例提供的干扰抑制方法，包括：
步骤101、根据信道衰落矩阵确定预编码矩阵。
其中，信道衰落矩阵为N×M维矩阵，其中，M为发射端备选设备天线根数，N为接收端设备天线根数，M和N均为正整数，该信道衰落矩阵内各元素用于表征所述发射端备选设备各天线发射信号到所述基站各天线的信道衰落。在具体实现过程中，在基站作为接收端设备时，该发射端备选设备包括基站自身所服务的用户设备，即本小区用户设备，以及相邻小区用户设备；在用户设备作为接收端设备时，该发射端备选设备包括为用户设备自身所在范围服务的基站，以及相邻小区基站。
本领域技术人员可以理解，每一个发送端备选设备都对应一个预编码矩阵。例如，在基站作为接收端设备时，该预编码矩阵是基站根据信道估计所得的信道衰落矩阵确定的，并且，基站将该预编码矩阵发送给对应的用户设备，由用户设备对待发送的信号进行预处理，以方便基站接收后进行信号检测。
步骤102、根据所述预编码矩阵、发射端备选设备的信号功率及所述信号到所述接收端设备的信道衰落矩阵获取接收基向量。
与现有技术类似，各接收端设备首先要确定接收基向量，但不同于现有技术的是，本发明中的接收端设备的接收基向量不是随意选取的，还需考虑接收基向量与发射端备选设备所发送信号的匹配，使得发射端备选设备发送的信号尽可能多的落在接收基向量张成的接收子空间中。
另外，由于信道状态信息(Channel State Information，简称：CSI)、预编码矩阵和接收基向量等因素会影响信号的传输速率，因此，在接收基向量与信 号较匹配时，有利于获得更高的传输速率。
步骤103、根据所述接收基向量确定接收子空间，并在所述接收子空间中接收发射端选定设备发送的信号。
其中，发射端选定设备为接收端设备从发射端备选设备与层数对中选取的满足预设干扰泄漏条件的设备，该预设干扰泄漏条件可以是干扰泄漏值最小，干扰泄漏值最小的发射端备选设备与层数对作为发射端选定设备；或者，预设干扰泄漏条件是一预设值，干扰泄漏值小于等于该预设值的干扰泄漏值均为满足预设干扰泄漏条件，此时，满足该预设干扰泄漏条件的发射端备选设备与层数对作为发射端选定设备。
由于发射端备选设备多天线的存在，每个发射端备选设备最多可以在空间上复用min(M,N)层，其中，min表示比较数值M和N的大小，取数值较小的作为发射端备选设备的复用层数，例如，用t表示某发射端备选设备k在空间上复用min(M,N)层中的任意一层，则(k,t)即表示发射端备选设备与层数对，表示k在第t层上向其对应的接收端设备发送信号。
在具体实现过程中，接收端设备，例如，基站，将确定的预编码矩阵告知对应的发射端选定设备，发射端选定设备使用对应的预编码矩阵发送信号；基站接收该信号后，采用各种传统的线性检测算法恢复出所服务的发射端选定设备的发送数据。
本发明实施例提供的干扰抑制方法，可以抑制ACI，避免由于ACI导致接收端设备，例如基站(Base Station，简称：BS)，接收发射端选定设备，例如，用户设备(User Equipment，简称：UE)，信号效率低的问题，以实现接收端设备高效接收本小区发射端选定设备发送的信号，获得较高的接收信干噪比及传输速率。
本实施例提供的干扰抑制方法可以应用在同构网络或异构网络中，其中，同构网络中包括宏基站(Macro Site，简称：MBS)和宏用户设备(Macro User Equipment，简称：MUE)；异构网络中包括MBS、MUE、微基站(Pico Site，简称：PBS)和微用户设备(Pico User Equipment，简称：PUE)。其中，宏基站的高功率较高，覆盖范围较小；微基站的功率较低，覆盖范围较小。每个基站向若干用户提供接入服务。
下面采用几个具体的实施例，对图1所示方法实施例的技术方案进行详细 说明。该些实施例中采用基站作为接收端设备，用户设备作为发射端备选设备和发射端选定设备，本领域技术人员可以将发射端和接收端相互置换，即用户设备作为接收端设备，而基站作为发射端备选设备和发射端选定设备，两种场景中方法原理和实现方式类似。
图2为本发明实施例应用场景中同构网络的示例图。如图2所示，该同构结构包括宏用户设备MUE1、MUE2、…、MUE9和MUE10，以及宏基站MBS1、MBS2和MBS3。本领域技术人员可以理解，在具体实现过程中，同构结构可以包括多个MUE或MBS，不限于本实施例中的个数。为了便于说明，本实施例以宏基站m和宏用户设备k为例进行说明，其中，宏基站m为图2所示的宏用户设备中的任意一个，宏用户设备k为图2所示的宏基站中的任意一个。如图2所示，每个基站服务的范围为以基站所处的地理位置为中心的虚线范围，以MBS1为例，服务范围覆盖MUE2和MUE5，MUE1和MUE8在MBS1服务边缘地带。
首先，本实施例对步骤101中的根据信道衰落矩阵确定预编码矩阵进行详细说明。
现有技术中，基站配备N根天线，用户设备配备一根天线，在当前时频资源块上，认为信道呈平坦衰落，用户设备l以功率Pl向为自己服务的基站m发送信号xl，其中，该发送信号到基站m所经历的信道衰落记为Hlm，该信道衰落是根据信道估计获取的，此时，Hlm为N×1维向量；定义A为当前时频资源块上发送信号的所有用户设备的集合，μ(m)表示基站m所服务的用户设备的集合，β(l)表示为用户设备l服务的基站，则基站m接收到的信号可以表示为：
Figure PCTCN2014092802-appb-000011
上式中，符号“∩”表示取其左右两部分的交集，符号“/”表示取其左右两部分的差集，nm表示基站m处的噪声向量。
而在本发明实施例中，与现有技术相对应，发射端备选设备为用户设备，接收端设备为基站，则本发明与现有技术的区别在于：发射端备选设备配备M根天线，此时，由于发射端备选设备多天线的存在，每个发射端备选设备最多可以在空间上复用min(M,N)层，其中，min表示比较数值M和N的大小，取 数值较小的作为发射端备选设备的复用层数。
假设k为所述发射端备选设备的编号，1≤k≤μ(m)，t为所述发射端备选设备的预编码矩阵中各列的编号，即空间上复用的min(M,N)层的编号，1≤t≤min(M,N)，μ(m)表示接收端设备，即基站m所服务的发射端备选设备的集合，A＝{(k,t):1≤k≤μ(m),1≤t≤min(M,N)}表示所有可能的发射端备选设备与层数对的集合；vk,t表示第k个所述发射端备选设备的预编码矩阵的第t列，Pk,t为第k个所述发射端备选设备在空间的第t层上的发送功率，所述信号到m途经的信道衰落矩阵为Hmk。
第k发射端备选设备在空间的第t层上以功率Pk,t向为自己服务的基站m发送信号xk,t，对应预编码矩阵的第t列vk,t，则本发明中基站m接收到的信号可以表示为：
Figure PCTCN2014092802-appb-000012
比较公式(1)和公式(2)，易知：多天线发射端备选设备在发送信号前，首先利用预编码矩阵对待发送信号进行预编码处理，其中，预编码矩阵为根据信道估计获取的信道衰落矩阵确定的，包括：对所述信道衰落矩阵进行奇异值分解，则所述预编码矩阵为所述奇异值分解后的min(M,N)个最大的特征值对应的min(M,N)个右奇异向量组成的矩阵，其中，min(M,N)表示取M和N中较小的值。
具体地，预编码矩阵采用如下方式生成：
基站根据信道估计，获取其所服务的用户设备到自己经历的信道衰落矩阵，例如，发射端备选设备k到为其服务的基站m经历的信道衰落矩阵Hmk，对Hmk进行奇异值分解(Singular Value Decomposition，简称：SVD)得到：
Figure PCTCN2014092802-appb-000013
其中，Umk为M×M酉矩阵；Vmk为N×N酉矩阵，其上标H表示矩阵共轭转置运算；Λmk为M×N对角矩阵，主对角线元素为由Hmk的奇异值构成，不失一般性，令各奇异值降序排列，则Vmk的第t列向量vk,t正是对应Hmk的第t大的奇异值的右奇异向量，且是归一的。
在步骤102中，根据预编码矩阵、发射端备选设备的信号功率及该信号到 接收端设备的信道衰落矩阵获取接收基向量，可以通过以下方式实现：
基站接收的本小区内发射端备选设备k所发送信号中有用信号的总和为
Figure PCTCN2014092802-appb-000014
根据如下公式获取接收矩阵，将所述接收矩阵中各列向量作为所述接收基向量：
Figure PCTCN2014092802-appb-000015
其中，Um为所述接收矩阵；
Figure PCTCN2014092802-appb-000016
表示计算得到满足[]中部分取值最大时U的取值大小作为Um的值；U是N×S维的复矩阵，S表示所述接收端设备需要接收的信号流的流数；上标H表示共轭转置；I为单位向量；
Figure PCTCN2014092802-appb-000017
表示对UHHmkvk,t计算F-范数；μ(m)表示m所服务的用户设备的集合；Σ表示求和计算。
将公式(4)第二行展开得到：
Figure PCTCN2014092802-appb-000018
根据约束最优化的相关知识可知，要让式子(5)中左右部分取到最大值的U应当是矩阵
Figure PCTCN2014092802-appb-000019
的S个最大的特征值对应的特征向量所组成的矩阵，将该矩阵作为基站的接收矩阵，其各列向量作为基站每根天线的接收基向量，其中，S为集合μ(m)∩A中元素的个数，即基站m需要同时接收的信号流的流数，假设在当前时频资源块上，基站与其所服务的用户设备之间最多同时有S<N个信号流在传输。
在步骤103中的根据所述接收基向量确定接收子空间，并在所述接收子空间中接收发射端选定设备发送的信号之前，还可以包括：计算所述发射端备选设备与层数对的干扰泄漏值。
与现有技术类似，计算所述发射端备选设备与层数对的干扰泄漏值。如公式(2)中列出的基站m接收到的信号，根据如下式子计算发射端备选设备k在第t空间层上传输产生的干扰泄漏值：
Figure PCTCN2014092802-appb-000020
其中，Um为接收端设备m的接收矩阵，上标H表示共轭转置；k为所述发射端备选设备的编号，1≤k≤μ(m)，t为所述发射端备选设备的预编码矩阵中各列的编号，即空间上复用的min(M,N)层的编号，1≤t≤min(M,N)，vk,t表示第k个所述发射端备选设备的预编码矩阵的第t列，Pk,t为第k个所述发射端备选设备在空间的第t层上的发送功率，所述信号到m途径的信道衰落矩阵为Hmk；ILk,t为当发射端设备k在第t层上传输时，在各不为k服务的接收端设备处产生的干扰泄漏值；β(k)表示为k服务的接收端设备；
Figure PCTCN2014092802-appb-000021
表示对UHHmkvk,t计算F-范数；Σ表示求和计算。
在基站获取各发射端备选设备在min(M,N)层中任一层上传输产生的干扰泄漏值之后，基站之间彼此交换发射端备选设备的干扰泄漏值，使得各基站获取到每一个发射端备选设备的干扰泄漏值。最后，基站遍历自己服务的所有发射端备选设备与层数对(k,t)，根据计算得到的所述干扰泄漏值，选取发射端备选设备与层数对中满足预设干扰泄漏条件的设备作为发射端选定设备，对该发射端选定设备发送的信号在接收基向量确定的接收子空间中进行接收。
本发明实施例提供的干扰抑制方法，通过与发射侧发送信号所匹配的接收基向量的获取，以及发射端备选设备中满足预设干扰泄漏条件的设备的选取，实现ACI的抑制，与现有技术相比，提高了本小区信号的接收信干噪比，有利于获得更高的传输速率；同时，考虑用户设备配备多天线的多输入多输出(Multiple Input Multiple Output，简称：MIMO)场景，使得本发明实施例提供的干扰抑制方法适用于多天线场景。
图3为本发明实施例应用场景中异构网络的示例图。如图3所示，该异构结构包括宏基站MBS，微基站PBS1、PBS2和PBS3，以及宏用户设备和微用户设备，这里，统一表示为UE1、UE2、…、UE9和UE10。由图3可见，UE5、UE8和UE9为宏用户设备，落在微基站PBSj,，j＝1,2,3服务范围的为微用户设备，例如，UE1和UE2在PBS1服务范围内，是PBS1的微用户设备。本领域技术人员可以理解，在具体实现过程中，异构结构可以包括多个UE、PBS或MBS，不限于本实施例中的个数。
本实施例中，接收端设备包括宏接收端设备和微接收端设备，发射端备选设备包括宏发射端备选设备和微发射端备选设备。其中，宏接收端设备为宏基站，微接收端设备为微基站，宏发射端备选设备为宏用户设备，微发射端备选设备为微用户设备。
仍设定所有的基站配备N根天线，所有的用户设备配备M根天线。在本实施例中考虑异构网络的分层结构，通常希望微基站对于宏基站来说是透明的，即宏基站与宏用户设备间的传输完全不考虑微基站与微用户设备的存在，因此，首先应考虑消除层间干扰，即微用户设备对宏用户设备的干扰和宏用户设备对微基站的干扰；之后，再消除层内干扰，即微用户设备对非服务微基站的干扰。如图4所示，本实施例具体实现流程如下：
步骤401、根据信道衰落矩阵确定预编码矩阵。
本步骤可参照上述实施例中步骤101所示，本实施例不再赘述。
步骤402、宏基站根据预设规则确定预设数量的宏用户设备。
宏基站根据某种预设准则选定预设数量的宏用户设备与层数对(k,t)，其中，预设规则与预设数量可以根据需求设定，这里不对其进行限制。将选定的宏用户设备与层数对记为
Figure PCTCN2014092802-appb-000022
其中，
Figure PCTCN2014092802-appb-000023
Figure PCTCN2014092802-appb-000024
表示Sm个宏用户设备，
Figure PCTCN2014092802-appb-000025
分别表示Sm个宏用户设备的空间上复用min(M,N)层中的编号。
步骤403、宏基站根据所述宏用户设备到宏基站的信道衰落矩阵和所述宏用户设备对应的预编码矩阵，获取所述宏基站的接收基向量。
具体地，在步骤402选择的Sm个宏用户设备将落在接收子空间
Figure PCTCN2014092802-appb-000026
中，其中，
Figure PCTCN2014092802-appb-000027
表示 选中的宏用户设备
Figure PCTCN2014092802-appb-000028
到宏基站MBS所经历的信道衰落矩阵，i介于1到Sm之间；对矩阵
Figure PCTCN2014092802-appb-000029
求解获取宏基站的接收基向量，例如，可以对该矩阵做施密特正交化，得到Sm个正交归一化的N维向量作为宏基站的接收基向量BMBS，也可以通过其它手段，例如求解方程组等获取接收基向量BMBS。
步骤404、微基站根据所述宏用户设备到微基站的信道衰落矩阵和所述宏用户设备对应的预编码矩阵，获取所述微基站的接收基向量。
具体地，计算宏用户设备在微基站PBSj,j＝1,2,3，处占据的接收子空间
Figure PCTCN2014092802-appb-000030
其中
Figure PCTCN2014092802-appb-000031
表示选中的宏用户设备MUE到微基站PBSj所经历的信道衰落矩阵；求解矩阵
Figure PCTCN2014092802-appb-000032
获取微基站的接收基向量，例如，采用奇异值分解或方程组求解的方式获取接收基向量，如选择奇异值分解后的SP个零奇异值对应的左奇异向量作为微基站PBSj的接收基向量，Sm与SP之和小于等于N。
其中，步骤402～步骤404是对步骤102的进一步细化，且步骤404与步骤402、步骤403之间无时序关系，即步骤404可以与步骤402或步骤403并行执行，也可以先后执行。
步骤405、计算发射端备选设备与层数对的干扰泄漏值。
该步骤中，发射端备选设备包括宏用户设备和微用户设备。参照上述实施例中计算干扰泄漏值的方法，分别计算微用户设备和宏用户设备，即图3所示的UE1、UE2、…、UE9和UE10，的干扰泄漏值。
步骤406、根据计算得到的所述干扰泄漏值，选取发射端备选设备与层数对中满足预设干扰泄漏条件的设备作为发射端选定设备。
其中，所述预设干扰泄漏条件包括：干扰泄漏值最小；或所述预设干扰泄漏条件为一预设值，小于等于所述预设值的干扰泄漏值均为满足所述预设干扰泄漏条件。
步骤407、根据所述接收基向量确定接收子空间，并在所述接收子空间中接收发射端选定设备发送的信号。
本步骤可参照上述实施例中步骤103所示，本实施例不再赘述。
本发明实施例干扰抑制方法，考虑异构网络中宏基站接收基向量的选择，以及发射端备选设备配备多天线的MIMO场景，与现有技术相比，提高了本小区信号的接收信干噪比，有利于获得更高的传输速率，此外也使得本发明提供的干扰抑制方法适用于多天线场景。此外，本实施例中给出的异构网络中的技术方案，使得微基站和微用户设备完全对宏基站透明，即宏基站可以忽略微基站和微用户设备的存在，从而使得微基站的布置无需与宏基站进行协调，降低了异构网络布网的难度。
图5为本发明干扰抑制装置实施例一的结构示意图，本实施例的装置可集成在基站或用户设备中，如图5所示，本实施例的装置包括确定模块51、获取模块52和接收模块53。
其中，确定模块51用于根据信道衰落矩阵确定预编码矩阵，所述信道衰落矩阵为N×M维矩阵，其中，M为发射端备选设备天线根数，N为接收端设备天线根数，M和N均为正整数，所述信道衰落矩阵内各元素用于表征所述发射端备选设备各天线发射信号到所述接收端设备各天线的信道衰落；获取模块52用于根据所述预编码矩阵、发射端备选设备的信号功率及所述信号到所述接收端设备的信道衰落矩阵获取接收基向量；接收模块53用于根据所述接收基向量确定接收子空间，并在所述接收子空间中接收发射端选定设备发送的信号，所述发射端选定设备为所述接收端设备从发射端备选设备与层数对中选取的满足预设干扰泄漏条件的设备。
本实施例的干扰抑制装置，可以用于干扰抑制方法实施例的技术方案，其实现原理和技术效果类似，此处不再赘述。
在上述实施例中，确定模块51可以具体用于：对所述信道衰落矩阵进行奇异值分解，则所述预编码矩阵为所述奇异值分解后的min(M,N)个最大的特征值对应的min(M,N)个右奇异向量组成的矩阵，其中，min(M,N)表示取M和N中较小的值。
进一步地，获取模块52可以具体用于：根据所述预编码矩阵、发射端备选设备的信号功率及所述信号到所述接收端设备的信道衰落矩阵，获取满足如 下所示表达式的接收矩阵作为接收基向量：
Figure PCTCN2014092802-appb-000033
其中，U是N×S维的复矩阵，S表示所述接收端设备需要接收的信号流的流数；上标H表示共轭转置；
Figure PCTCN2014092802-appb-000034
表示在所有满足条件UHU＝I的U中求所述矩阵函数最大值，I为单位矩阵；arg表示求所述矩阵函数取得最大值时对应的自变量值Um；k为所述发射端备选设备的编号，1≤k≤μ(m)，t为所述发射端备选设备的预编码矩阵中各列的编号，即空间上复用的min(M,N)层的编号，1≤t≤min(M,N)，μ(m)表示m所服务的发射端备选设备的集合，A＝{(k,t):1≤k≤μ(m),1≤t≤min(M,N)}表示所有可能的发射端备选设备与层数对的集合；vk,t表示第k个所述发射端备选设备的预编码矩阵的第t列，Pk,t为第k个所述发射端备选设备在空间的第t层上的发送功率，所述信号到m途经的信道衰落矩阵为Hmk；Σ表示求和计算。
其中，所述接收矩阵可以为
Figure PCTCN2014092802-appb-000035
的S个最大的特征值对应的特征向量组成的矩阵，也可以通过其它方式获取。
在图5的基础上，接收端设备可以包括宏接收端设备和微接收端设备，发射端备选设备可包括宏发射端备选设备和微发射端备选设备。本实施例中，采用宏基站作为宏接收端设备，微基站作为微接收端设备，宏用户设备作为宏发射端备选设备，微用户设备作为微发射端备选设备。
图6为本发明干扰抑制装置实施例二的结构示意图，如图6所示，获取模块52可包括：
确定单元521用于根据预设规则确定预设数量的宏发射端备选设备与层数对；第一获取单元522用于根据所述宏发射端备选设备到宏接收端设备的信道衰落矩阵和所述宏发射端备选设备对应的预编码矩阵，获取所述宏接收端设 备的接收基向量；第二获取单元523用于根据所述宏发射端备选设备到微接收端设备的信道衰落矩阵和所述宏发射端备选设备对应的预编码矩阵，获取所述微接收端设备的接收基向量。
本实施例的装置用于执行图4所示方法实施例的技术方案，其实现原理和技术效果类似，此处不再赘述。
在上述基础上，本实施例中的干扰抑制装置还可以包括：计算模块61用于计算所述发射端备选设备与层数对的干扰泄漏值。
根据如下式子计算所述发射端备选设备在第t空间层上传输产生的干扰泄漏值：
Figure PCTCN2014092802-appb-000036
其中，Um为接收端设备m的接收矩阵，上标H表示共轭转置；k为所述发射端备选设备的编号，1≤k≤μ(m)，t为所述发射端备选设备的预编码矩阵中各列的编号，即空间上复用的min(M,N)层的编号，1≤t≤min(M,N)，vk,t表示第k个所述发射端备选设备的预编码矩阵的第t列，Pk,t为第k个所述发射端备选设备在空间的第t层上的发送功率，所述信号到m途径的信道衰落矩阵为Hmk；ILk,t为当发射端设备k在第t层上传输时，在各不为k服务的接收端设备处产生的干扰泄漏值；β(k)表示为k服务的接收端设备；
Figure PCTCN2014092802-appb-000037
表示对UHHmkvk,t计算F-范数；Σ表示求和计算。
进一步地，该干扰抑制装置还可以包括：选择模块62，用于根据计算得到的所述干扰泄漏值，选取发射端备选设备与层数对中满足预设干扰泄漏条件的设备作为发射端选定设备。其中，所述预设干扰泄漏条件可包括：干扰泄漏值最小；或所述预设干扰泄漏条件为一预设值，小于等于所述预设值的干扰泄漏值均为满足所述预设干扰泄漏条件。
本发明实施例干扰抑制装置，考虑异构网络中宏基站接收基向量的选择，以及发射端备选设备配备多天线的MIMO场景，与现有技术相比，提高了本小区信号的接收信干噪比，有利于获得更高的传输速率，此外也使得本发明提 供的干扰抑制方法适用于多天线场景。此外，本实施例中给出的异构网络中的技术方案，使得微基站和微用户设备完全对宏基站透明，即宏基站可以忽略微基站和微用户设备的存在，从而使得微基站的布置无需与宏基站进行协调，降低了异构网络布网的难度。
本领域普通技术人员可以理解：实现上述各方法实施例的全部或部分步骤可以通过程序指令相关的硬件来完成。前述的程序可以存储于一计算机可读取存储介质中。该程序在执行时，执行包括上述各方法实施例的步骤；而前述的存储介质包括：ROM、RAM、磁碟或者光盘等各种可以存储程序代码的介质。
最后应说明的是：以上各实施例仅用以说明本发明的技术方案，而非对其限制；尽管参照前述各实施例对本发明进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分或者全部技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本发明各实施例技术方案的范围。

Claims (18)

  1. 一种干扰抑制方法，其特征在于，包括：
    根据信道衰落矩阵确定预编码矩阵，所述信道衰落矩阵为N×M维矩阵，其中，M为发射端备选设备天线根数，N为接收端设备天线根数，M和N均为正整数，所述信道衰落矩阵内各元素用于表征所述发射端备选设备各天线发射信号到所述接收端设备各天线的信道衰落；
    根据所述预编码矩阵、发射端备选设备的信号功率及所述信号到所述接收端设备的信道衰落矩阵获取接收基向量；
    根据所述接收基向量确定接收子空间，并在所述接收子空间中接收发射端选定设备发送的信号，所述发射端选定设备为所述接收端设备从发射端备选设备与层数对中选取的满足预设干扰泄漏条件的设备。
  2. 根据权利要求1所述的方法，其特征在于，所述根据信道衰落矩阵确定预编码矩阵，包括：
    对所述信道衰落矩阵进行奇异值分解，则所述预编码矩阵为所述奇异值分解后的min(M,N)个最大的特征值对应的min(M,N)个右奇异向量组成的矩阵，其中，min(M,N)表示取M和N中较小的值。
  3. 根据权利要求1所述的方法，其特征在于，根据所述预编码矩阵、发射端备选设备的信号功率及所述信号到所述接收端设备的信道衰落矩阵获取接收基向量，包括：
    根据所述预编码矩阵、发射端备选设备的信号功率及所述信号到所述接收端设备的信道衰落矩阵，获取满足如下所示表达式的接收矩阵作为接收基向量：
    Figure PCTCN2014092802-appb-100001
    其中，U是N×S维的复矩阵，S表示所述接收端设备需要接收的信号流的流数；上标H表示共轭转置；
    Figure PCTCN2014092802-appb-100002
    表示在所有满足条件UHU＝I的U中求所述矩阵函数最大值，I为单位矩阵；arg表示求所述矩阵函数取得最大值时对应的自变量值Um；k为所述发射端备选设备的编号，1≤k≤μ(m)，t为所述发射 端备选设备的预编码矩阵中各列的编号，即空间上复用的min(M,N)层的编号，1≤t≤min(M,N)，μ(m)表示m所服务的发射端备选设备的集合，A＝{(k,t):1≤k≤μ(m),1≤t≤min(M,N)}表示所有可能的发射端备选设备与层数对的集合；vk,t表示第k个所述发射端备选设备的预编码矩阵的第t列，Pk,t为第k个所述发射端备选设备在空间的第t层上的发送功率，所述信号到m途经的信道衰落矩阵为Hmk；Σ表示求和计算。
  4. 根据权利要求3所述的方法，其特征在于，所述接收矩阵为
    Figure PCTCN2014092802-appb-100003
    的S个最大的特征值对应的特征向量组成的矩阵。
  5. 根据权利要求2所述的方法，其特征在于，所述接收端设备包括宏接收端设备和微接收端设备，所述发射端备选设备包括宏发射端备选设备和微发射端备选设备；
    则根据所述预编码矩阵、发射端备选设备的信号功率及所述信号到所述基站的信道衰落矩阵获取接收基向量，包括：
    宏接收端设备根据预设规则确定预设数量的宏发射端备选设备与层数对；
    所述宏接收端设备根据所述宏发射端备选设备到宏接收端设备的信道衰落矩阵和所述宏发射端备选设备对应的预编码矩阵，获取所述宏接收端设备的接收基向量；
    所述微接收端设备根据所述宏发射端备选设备到微接收端设备的信道衰落矩阵和所述宏发射端备选设备对应的预编码矩阵，获取所述微接收端设备的接收基向量。
  6. 根据权利要求1-5任一项所述的方法，其特征在于，根据所述接收基向量确定接收子空间，并在所述接收子空间中接收发射端选定设备发送的信号之前，还包括：
    计算所述发射端备选设备与层数对的干扰泄漏值。
  7. 根据权利要求6所述的方法，其特征在于，计算所述发射端备选设备与层数对的干扰泄漏值，包括：
    根据如下式子计算所述发射端备选设备在第t空间层上传输产生的干扰泄漏值：
    其中，Um为接收端设备m的接收矩阵，上标H表示共轭转置；k为所述发射端备选设备的编号，1≤k≤μ(m)，t为所述发射端备选设备的预编码矩阵中各列的编号，即空间上复用的min(M,N)层的编号，1≤t≤min(M,N)，vk,t表示第k个所述发射端备选设备的预编码矩阵的第t列，Pk,t为第k个所述发射端备选设备在空间的第t层上的发送功率，所述信号到m途径的信道衰落矩阵为Hmk；ILk,t为当发射端设备k在第t层上传输时，在各不为k服务的接收端设备处产生的干扰泄漏值；β(k)表示为k服务的接收端设备；
    Figure PCTCN2014092802-appb-100005
    表示对UHHmkvk,t计算F-范数；Σ表示求和计算。
  8. 根据权利要求7所述的方法，其特征在于，计算所述发射端备选设备与层数对的干扰泄漏值之后，还包括：
    根据计算得到的所述干扰泄漏值，选取发射端备选设备与层数对中满足预设干扰泄漏条件的设备作为发射端选定设备。
  9. 根据权利要求8所述的方法，其特征在于，所述预设干扰泄漏条件包括：
    干扰泄漏值最小；或所述预设干扰泄漏条件为一预设值，小于等于所述预设值的干扰泄漏值均为满足所述预设干扰泄漏条件。
  10. 一种干扰抑制装置，其特征在于，包括：
    确定模块，用于根据信道衰落矩阵确定预编码矩阵，所述信道衰落矩阵为N×M维矩阵，其中，M为发射端备选设备天线根数，N为接收端设备天线根数，M和N均为正整数，所述信道衰落矩阵内各元素用于表征所述发射端备选设备各天线发射信号到所述接收端设备各天线的信道衰落；
    获取模块，用于根据所述预编码矩阵、发射端备选设备的信号功率及所述信号到所述接收端设备的信道衰落矩阵获取接收基向量；
    接收模块，用于根据所述接收基向量确定接收子空间，并在所述接收子空间中接收发射端选定设备发送的信号，所述发射端选定设备为所述接收端设备从发射端备选设备与层数对中选取的满足预设干扰泄漏条件的设备。
  11. 根据权利要求10所述的装置，其特征在于，所述确定模块具体用于：
    对所述信道衰落矩阵进行奇异值分解，则所述预编码矩阵为所述奇异值分解后的min(M,N)个最大的特征值对应的min(M,N)个右奇异向量组成的矩阵，其中，min(M,N)表示取M和N中较小的值。
  12. 根据权利要求10所述的装置，其特征在于，所述获取模块具体用于：
    根据所述预编码矩阵、发射端备选设备的信号功率及所述信号到所述接收端设备的信道衰落矩阵，获取满足如下所示表达式的接收矩阵作为接收基向量：
    Figure PCTCN2014092802-appb-100006
    其中，U是N×S维的复矩阵，S表示所述接收端设备需要接收的信号流的流数；上标H表示共轭转置；
    Figure PCTCN2014092802-appb-100007
    表示在所有满足条件UHU＝I的U中求所述矩阵函数最大值，I为单位矩阵；arg表示求所述矩阵函数取得最大值时对应的自变量值Um；k为所述发射端备选设备的编号，1≤k≤μ(m)，t为所述发射端备选设备的预编码矩阵中各列的编号，即空间上复用的min(M,N)层的编号，1≤t≤min(M,N)，μ(m)表示m所服务的发射端备选设备的集合，A＝{(k,t):1≤k≤μ(m),1≤t≤min(M,N)}表示所有可能的发射端备选设备与层数对的集合；vk,t表示第k个所述发射端备选设备的预编码矩阵的第t列，Pk,t为第k个所述发射端备选设备在空间的第t层上的发送功率，所述信号到m途经的信道衰落矩阵为Hmk；Σ表示求和计算。
  13. 根据权利要求12所述的装置，其特征在于，所述接收矩阵为
    Figure PCTCN2014092802-appb-100008
    的S个最大的特征值对应的特征向量组成的矩阵。
  14. 根据权利要求11所述的装置，其特征在于，所述接收端设备包括宏接收端设备和微接收端设备，所述发射端备选设备包括宏发射端备选设备和微发射端备选设备；
    则所述获取模块包括：
    确定单元，用于根据预设规则确定预设数量的宏发射端备选设备与层数对；
    第一获取单元，用于根据所述宏发射端备选设备到宏接收端设备的信道衰落矩阵和所述宏发射端备选设备对应的预编码矩阵，获取所述宏接收端设备的接收基向量；
    第二获取单元，用于根据所述宏发射端备选设备到微接收端设备的信道衰落矩阵和所述宏发射端备选设备对应的预编码矩阵，获取所述微接收端设备的接收基向量。
  15. 根据权利要求10-14任一项所述的装置，其特征在于，还包括：
    计算模块，用于计算所述发射端备选设备与层数对的干扰泄漏值。
  16. 根据权利要求15所述的装置，其特征在于，所述计算模块具体用于：
    根据如下式子计算所述发射端备选设备在第t空间层上传输产生的干扰泄漏值：
    Figure PCTCN2014092802-appb-100009
    其中，Um为接收端设备m的接收矩阵，上标H表示共轭转置；k为所述发射端备选设备的编号，1≤k≤μ(m)，t为所述发射端备选设备的预编码矩阵中各列的编号，即空间上复用的min(M,N)层的编号，1≤t≤min(M,N)，vk,t表示第k个所述发射端备选设备的预编码矩阵的第t列，Pk,t为第k个所述发射端备选设备在空间的第t层上的发送功率，所述信号到m途径的信道衰落矩阵为Hmk；ILk,t为当发射端设备k在第t层上传输时，在各不为k服务的接收端设备 处产生的干扰泄漏值；β(k)表示为k服务的接收端设备；
    Figure PCTCN2014092802-appb-100010
    表示对UHHmkvk,t计算F-范数；Σ表示求和计算。
  17. 根据权利要求16所述的装置，其特征在于，还包括：
    选择模块，用于根据计算得到的所述干扰泄漏值，选取发射端备选设备与层数对中满足预设干扰泄漏条件的设备作为发射端选定设备。
  18. 根据权利要求17所述的装置，其特征在于，所述预设干扰泄漏条件包括：
    干扰泄漏值最小；或所述预设干扰泄漏条件为一预设值，小于等于所述预设值的干扰泄漏值均为满足所述预设干扰泄漏条件。
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