WO2010130085A1 - 一种干扰消除方法及数据发射装置 - Google Patents

一种干扰消除方法及数据发射装置 Download PDF

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Publication number
WO2010130085A1
WO2010130085A1 PCT/CN2009/071756 CN2009071756W WO2010130085A1 WO 2010130085 A1 WO2010130085 A1 WO 2010130085A1 CN 2009071756 W CN2009071756 W CN 2009071756W WO 2010130085 A1 WO2010130085 A1 WO 2010130085A1
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Prior art keywords
vector
user
interference
users
linear combination
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PCT/CN2009/071756
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English (en)
French (fr)
Inventor
刘晟
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华为技术有限公司
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Priority to CN200980111101.3A priority Critical patent/CN102577139B/zh
Priority to EP09838580.0A priority patent/EP2429087B1/en
Priority to PCT/CN2009/071756 priority patent/WO2010130085A1/zh
Publication of WO2010130085A1 publication Critical patent/WO2010130085A1/zh
Priority to US13/293,774 priority patent/US8599978B2/en

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00Baseband systems
    • H04L25/02Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006Arrangements for removing intersymbol interference
    • H04L25/03343Arrangements at the transmitter end
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413MIMO systems
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0617Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00Baseband systems
    • H04L25/02Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006Arrangements for removing intersymbol interference
    • H04L2025/0335Arrangements for removing intersymbol interference characterised by the type of transmission
    • H04L2025/03426Arrangements for removing intersymbol interference characterised by the type of transmission transmission using multiple-input and multiple-output channels

Definitions

  • the present invention relates to the field of wireless communication technologies, and in particular, to an interference cancellation method and a data transmitting apparatus.
  • BACKGROUND OF THE INVENTION Interference is one of the main factors limiting the capacity of a wireless communication system. Taking a cellular system as an example, although interference effects can be mitigated by techniques such as resource scheduling and power control, small-area interference is still a major factor limiting the capacity of the cellular system.
  • the joint elimination of interference by cooperative processing of multiple neighboring cells is the main way to suppress inter-cell interference.
  • pre-coding techniques can be used to eliminate interference by cooperative processing of multiple neighboring cells.
  • One way is to completely share the data of each end user with mutual interference between adjacent base stations, but it is required to use high-speed large-bandwidth link interconnection between base stations, which causes high cost in actual systems.
  • each mobile terminal is completely independent.
  • One way is to perform joint data reception processing between the base stations. By means of joint detection, the interference between users is eliminated and the signals of the respective users are separated. The bandwidth required for interference cancellation in this way is larger than the bandwidth required for downlink pending data sharing, and it also causes high costs in practical systems.
  • the number of transmitting sources and the number of users are both K, and the number of antennas per transmitting source is ⁇
  • the number of receiving antennas per user is ⁇ , and there is no data sharing between the transmitting sources and the users, that is, Each transmitter only knows the data of its own user (or receiver), but does not know the data of other users (or receivers). Therefore, it can only achieve interference between users by precoding the user data. inhibition.
  • Interference alignment is the main technical way to solve the interference cancellation problem of the user interference channel model.
  • the basic idea is that the interference vector received by the i-th user from other transmitters is aligned as much as possible, so as to obtain as little interference space as possible. Interference cancellation.
  • the linear interference alignment technology is still in the initial stage of research. How to effectively implement the interference alignment of any number of users and the number of arbitrary antennas is not solved. Summary of the invention
  • Embodiments of the present invention provide a general method for interference alignment of any number of users and any number of antennas.
  • An embodiment of the present invention provides an interference cancellation method, including:
  • the transmitting end acquires the interference vector of each user, and the interference vector of the kth user is H fa .
  • W;m where k, i, m are positive integers, and satisfy 1 ⁇ k ⁇ K , k ⁇ i , l ⁇ m ⁇ L k , m is the index of the number of signal streams, K is the number of users, ⁇ is the number of signal streams of the kth user, H fa . is the channel matrix of the i-th transmitter to the k-th user, The i-th transmitter signal stream number is indexed as a precoding vector of m, where ⁇ is the number of signal streams of the kth user;
  • the linear combination is a linear combination of the aligned interference vector and the remaining N - L A interference vectors, N is the number of receiving antennas of the user, and L is for all users Number of signal streams and;
  • the precoding vector of all transmitting ends is obtained by the linear combination relationship of all users;
  • a signal precoded by the precoding vector is transmitted.
  • An embodiment of the present invention provides an interference cancellation method, including:
  • the transmitting end acquires the interference vector of each user, and the interference vector of the kth user is where k, i, m are positive integers, and satisfy 1 ⁇ k ⁇ K , k ⁇ i , l ⁇ m ⁇ L k , m is the index of the number of signal streams, K is the number of users, L 3 ⁇ 4 is the number of signal streams of the kth user, and H K is the channel matrix of the i-th transmitter to the k-th user, which is the k-th user signal stream number
  • the receive filter vector with index m, L 3 ⁇ 4 is the number of signal streams of the kth user, and (.) ⁇ indicates that the matrix is conjugate transposed;
  • the linear combination is a linear combination of the aligned interference vector and the remaining M - L 3 ⁇ 4 interference vectors, M is the number of transmitting antennas at the transmitting end, and L is for all users Number of signal streams and;
  • the received filter vector for all users is obtained from the linear combination of all users.
  • an embodiment of the present invention provides a data transmitting apparatus, including:
  • the interference vector obtaining unit is configured to obtain an interference vector of each user, where the interference vector of the kth user is ⁇ ⁇ , where k, i, m are positive integers, and satisfy 1 ⁇ k ⁇ K, k ⁇ i , l ⁇ m ⁇ L k, m is the number of signal flow index, K is the number of users, L 3 ⁇ 4 of the number of streams k-th user signal, H K i th transmitting end to the k-th user's channel matrix, w im is a precoding vector whose index of the i-th transmitting end signal stream is indexed by m, and L 3 ⁇ 4 is the number of signal streams of the kth user; a linear combination relationship obtaining unit, configured to obtain, for each user, at least L - N linear combination relations, wherein the linear combination is a linear combination of the aligned interference vector and the remaining N - L 3 ⁇ 4 interference vectors, where N is the user's reception Number of antennas, L is the number of signal streams
  • a precoding vector obtaining unit for obtaining a precoding vector of all transmitting ends by a linear combination relationship of all users
  • a sending unit configured to send a signal precoded by the precoding vector.
  • An embodiment of the present invention provides another data transmitting apparatus, including:
  • the interference vector obtaining unit is configured to acquire an interference vector of each user, and the interference vector of the kth user is H ⁇ gkm , where k, i, m are positive integers, and satisfy 1 ⁇ k ⁇ K, k ⁇ channel matrix i, l ⁇ m ⁇ L k, m is the number of signal flow index, K is the number of users, L 3 ⁇ 4 of the number of streams k-th user signal, H K i th transmitting end to the k-th user , a received filter vector whose index is the kth user signal stream number, L 3 ⁇ 4 is the number of signal streams of the kth user, and (.) ⁇ indicates that the matrix is conjugate transposed;
  • a linear combination relationship obtaining unit configured to obtain, for each user, at least L - M linear combination relations, wherein the linear combination is a linear combination of the aligned interference vector and the remaining M - L 3 ⁇ 4 interference vectors, and M is a transmission of the transmitting end Number of antennas, L is the number of signal streams for all users;
  • a receive filter vector acquisition unit is used for the linear combination of all users to obtain the received filter vectors for all users.
  • FIG. 1 is a flowchart of an interference cancellation method according to an embodiment of the present invention
  • FIG. 3 is a schematic diagram of interference alignment according to an embodiment of the present invention.
  • FIG. 4 is a structural diagram of a transmitting end device according to an embodiment of the present invention.
  • FIG. 5 is a structural diagram of another transmitting end device according to an embodiment of the present invention.
  • DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The technical solutions in the embodiments of the present invention will be clearly and completely described in the following with reference to the accompanying drawings. It is apparent that the described embodiments are only a part of the embodiments of the invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.
  • an embodiment of the present invention provides an interference cancellation method, which is used for interference cancellation at a transmitting end in a wireless communication system, and includes:
  • the transmitting end acquires an interference vector of each user, and the interference vector of the kth user is H fa ⁇ m , where k, i, m are positive integers, and satisfy 1 ⁇ k ⁇ K , k ⁇ i , l ⁇ m ⁇ L k , m is the index of the number of signal streams, K is the number of users, L 3 ⁇ 4 is the number of signal streams of the kth user, and H K is the channel matrix of the i th transmitter to the kth user, w Im is the precoding vector whose index of the i-th transmitting end is indexed as m, and L 3 ⁇ 4 is the number of signal streams of the kth user; where the transmitting end can be a base station, a relay station, a user equipment, etc., the user refers to the corresponding to the transmitting Receiver, such as a terminal.
  • the interference vector of the i-th user refers to the product of the channel matrix transmitted to the i-th
  • the linear combination is a linear combination of the aligned interference vector and the remaining NL 3 ⁇ 4 interference vectors, where N is the number of receiving antennas of the user, and L is a signal flow of all users. Number sum;
  • the equations obtained in simultaneous S102 are obtained, and the unknowns are the precoding vectors of each transmitter.
  • the equations are solved to obtain the precoding vectors of all base stations.
  • S104 Send a signal precoded by the precoding vector.
  • the embodiment of the invention further provides an interference cancellation method applied to the receiving end, which has a dual relationship with the interference cancellation method at the transmitting end. See Figure 2, including:
  • the transmitting end acquires an interference vector of each user, and the interference vector of the kth user is , where k, i, m are positive integers, and satisfy 1 ⁇ k ⁇ K , k ⁇ i , l ⁇ m ⁇ L k , m is the index of the number of signal streams, K is the number of users, L k is the first The number of signal streams for k users, H K is the channel matrix from the ith to the kth user, g km
  • the receiving filter vector whose index is m for the kth user signal stream number, L 3 ⁇ 4 is the number of signal streams of the kth user, (.f indicates that the matrix is conjugate transposed;
  • the linear combination is a linear combination of the aligned interference vector and the remaining ML 3 ⁇ 4 interference vectors, where M is the number of transmitting antennas at the transmitting end, and L is a signal flow of all users. Number sum;
  • the received filtering vector of all users is obtained by a linear combination relationship of all users.
  • the equations obtained in the simultaneous S102 are obtained, and the unknowns are the received filter vectors for each user.
  • the equations are solved to obtain the received filter vectors for all users.
  • the embodiment of the present invention is based on the basic idea of interference alignment, that is, the interference vectors received by the i-th user from other transmitting ends are aligned as much as possible, thereby obtaining as small interference space as possible, realizing the interference elimination of any number of antennas and any number of users.
  • the interference cancellation method of the embodiment of the present invention is described in detail below.
  • the channel model of the embodiment of the present invention adopts a ⁇ -user MIM0 interference channel model, that is, the number of base stations as the transmitting end and the number of users as the receiving end are both K, and the number of antennas of each base station is ⁇ , the number of receiving antennas per user is ⁇ ,
  • the base stations and the users that is, each transmitting end only knows the data of its own receiving end, and does not know the data of other receiving ends. Therefore, the user can only realize the precoding processing of the data of the receiving end itself. Interference suppression.
  • the embodiment of the present invention is not limited to the MIM0 interference channel model of the first user, and the other channel models have the same principle, and are not described herein.
  • the signal received by the kth user can be expressed as:
  • y ⁇ ⁇ + ⁇ 2 ⁇ 3 ⁇ 4 + ⁇ + ⁇ ⁇ (i)
  • NxM the precoding vector of the i-th base station
  • Mxl the transmitted signal, which is a scalar, and is a noise vector with a variance of ⁇ 2 .
  • the user's linear reception can always represent the weighted sum of the received signals of each receiving antenna.
  • the estimation of the kth user received signal is:
  • the single stream is taken as an example, that is, each user receives only one signal, that is, the number of signal streams per user is 1.
  • the single stream situation can be extended to multiple streams, that is, the number of signal streams of the kth user is L A .
  • the linear combination is a linear combination of the aligned interference vector and the remaining NL A interference vectors, where N is the number of receiving antennas of the user, and L is a signal of all users.
  • the number of streams and. Can be introduced, when the upper bound of the sum of the signal flows of all users is the rounded down value and H
  • the above interference canceller can be implemented.
  • the received signal vector is 3D, and 2 data is left in addition to the 1st dimension of the useful signal, then any 3 linear correlations among the 4 interference vectors .
  • line 1, H 14 w 4 is the interference vector to be aligned, and 4 is a linear combination of 2 ⁇ 2 and 3 ⁇ 3 , which can be expressed as
  • H 15 w 5 is the second interference vector to be aligned
  • 5 ⁇ 5 is a linear combination of 2 ⁇ 2 and 3 , which can be expressed as
  • multiple equations of the form (5), (6) can be obtained, and the equations are obtained, and each precoding vector can be obtained by solving.
  • Selecting till 0 or 1 simplifies the linear equations, and then obtains the precoding vector of each base station, and performs corresponding precoding and then sends it out by the base station.
  • Equation (4) can be expressed as the following linear equations: ⁇ 0 « ⁇ 12 muscle 3 - ⁇
  • the precoding vector of each transmitting base station can be determined, so that the i-th transmitting end to the kth
  • the equivalent channel matrix at the receiving end is (H fa . Wi ), and each receiving end can know the equivalent channel matrix, and select the appropriate receiver to receive the useful signal, such as the minimum mean square error receiver, maximum likelihood. Receiver, serial interference cancellation receiver, etc.
  • the receiving filter vector of each user can be further obtained.
  • Wi wfH «+ 2 IH ttWi H fa .
  • W A [w A1 w A2] is the precoding matrix of 4x2, 2x1 is to achieve interference alignment, should satisfy the following linear equations:
  • H 23 W 3 H 21 WA (14) H awkwardW, D, can be further expressed as:
  • Tw n ⁇ w n
  • Tw 12 2 2 w 12
  • the method for interference cancellation is introduced from the perspective of the receiving end, and the interference cancellation method at the transmitting end described above is dual with each other. At this time, the precoding vector of the transmitting end is not solved, but the receiving filtering of the user side is performed. Vector. In the case of single flow, in order to eliminate interference, there is
  • the coefficient vector of K-M interference-forcing zero equations in the above K equations must be the coefficient of the other M-1 interference-forcing equations except the kth equation.
  • the linear combination of vectors is the constraint for interference alignment:
  • L means round down.
  • the linear combination being a linear combination of the aligned interference vector and the remaining ML A interference vectors
  • M is the transmission of the transmitting end.
  • the number of antennas, L is the sum of the signal streams of all users.
  • the feature vector can be obtained by the existing feature vector, and further, each of the received filter vectors can be obtained by (21).
  • the precoding vector of the transmitting end can be further calculated, and the precoding vector 17 '' of the kth transmitting end is "" ⁇ ⁇ ⁇ 3 ⁇ 4+ ⁇ 2 ⁇ ⁇ ) 11 or
  • the embodiment of the invention further provides a method for judging which interference cancellation method is adopted, that is, in some cases, the interference cancellation method of the transmitting end is used preferentially, and in some cases, the interference cancellation method of the receiving end is adopted. Specifically:
  • the transmitting end acquires the interference vector of each user, and the interference vector of the kth user is H fa .
  • NK-M obtains precoding vectors for all transmitters by linear combination of all users
  • the transmitting end acquires the interference vector of each user, and the interference vector of the kth user is
  • k l, 2,... K
  • m is the index of the number of signal streams
  • K is the number of users
  • g km is the receiving filter vector of the kth user
  • L A is the number of signal streams of the kth user
  • (.) ⁇ indicates that the matrix is conjugated to each user, and at least LM linear combination relations are obtained
  • the linear combination is a linear combination of the aligned interference vector and the remaining interference vectors, ⁇ the number of transmit antennas at the transmitting end, and L satisfies
  • the received filter vector for all users is obtained from the linear combination of all users.
  • the method for canceling interference based on the transmitting end and the receiving end can perform interference cancellation for a communication system with any number of users and any number of antennas, and the application for inter-cell interference cancellation can greatly reduce the cost of the operator, and adopts a smaller At the cost, you get an improvement in system performance.
  • an embodiment of the present invention further provides a data transmitting device, such as a base station.
  • the method includes: an interference vector obtaining unit 401, configured to acquire an interference vector of each user, where the interference vector of the kth user is H ki w im , where k, i, m are positive integers, and satisfy 1 ⁇ k ⁇ K, i, ⁇ ⁇ m ⁇ L k , m is the index of the number of signal streams, K is the number of users, L A is the number of signal streams of the kth user, H fa . is the ith transmitter The channel matrix of the kth user, w ;m is a precoding vector whose index of the i-th transmitting end signal stream is indexed by m, and L A is the number of signal streams of the kth user;
  • the linear combination relationship obtaining unit 402 is configured to obtain, for each user, at least LN linear combination relationships, where the linear combination is a linear combination of the aligned interference vector and the remaining NL A interference vectors, where N is the number of receiving antennas of the user. L is the number of signal streams for all users; Coding vector
  • the sending unit 404 is configured to send a signal precoded by the precoding vector.
  • the apparatus may further include a receiving filter vector acquiring unit, configured to obtain a received filtering vector of all users according to the precoding vector acquired by the precoding vector acquiring unit, where the received filtering vector of the kth user is ⁇ H fa .w ; wfH + ⁇ 2 ⁇ H ttWi + ⁇ 2 ⁇ , H Fundamentalw t , where, represents noise
  • the acoustic variance is > ⁇ unit matrix, (.) H indicates that the matrix is conjugate transposed, and C) -1 indicates that the matrix is inverted.
  • the embodiment of the present invention further provides another data transmitting apparatus.
  • the method includes:
  • the interference vector obtaining unit 501 is configured to acquire an interference vector of each user, where the interference vector of the kth user is H i ghn , where k, i, m are positive integers, and satisfy 1 ⁇ k ⁇ K, k ⁇ i , l ⁇ m ⁇ L k , m is the index of the number of signal streams, K is the number of users, L A is the number of signal streams of the kth user, H fa .
  • indicates that the matrix is conjugate transposed
  • the linear combination relationship obtaining unit 502 is configured to obtain, for each user, at least L - M linear combination relationships, where the linear combination is a linear combination of the aligned interference vector and the remaining M - L A interference vectors, where M is the transmitting end Number of transmitting antennas, L is the number of signal streams for all users;
  • the receive filter vector obtaining unit 503 is configured to obtain a received filter vector of all users by a linear combination relationship of all users.
  • the apparatus may further include: a precoding vector acquiring unit, configured to obtain, according to the received filtering vector acquired by the receiving filtering vector acquiring unit, a precoding vector of all transmitting ends, a precoding vector of the kth transmitting end, where ⁇ 2 represents noise
  • the acoustic variance is > ⁇ unit matrix, (.f indicates that the conjugate is transposed to the matrix, indicating the inverse of the matrix.
  • the data transmitting apparatus may be specifically a base station, a relay station, a user equipment, a mobile terminal, or the like.
  • the interference cancellation can be performed for a communication system with any number of users and any number of antennas.
  • the application of inter-cell interference cancellation can greatly reduce the cost of the operator, and the system performance can be improved at a small cost.
  • the steps of a method or algorithm described in connection with the embodiments disclosed herein may be implemented directly in hardware, a software module executed by a processor, or a combination of both.
  • the software module can be placed in random access memory (RAM), memory, read only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or technical field. Any other form of storage medium known.

Description

一种干扰消除方法及数据发射装置 技术领域 本发明涉及无线通信技术领域, 具体涉及一种干扰消除方法及数据发射装置。 发明背景 干扰是限制无线通信系统容量的主要因素之一, 以蜂窝系统为例, 尽管可以通过资 源的调度和功率控制等技术减轻干扰的影响, 小区间干扰仍然是限制蜂窝系统容量的主 要因素。
通过多个相邻小区的协同处理来联合消除干扰, 是抑制小区间干扰的主要途径。 在 下行方向, 可以通过多个相邻小区的协同处理采用预编码技术消除干扰。 一种方式是个 相邻基站之间完全共享相互干扰的各终端用户的数据,但需要基站之间采用高速的大带 宽链路互连, 在实际系统中会造成很高的费用。 在上行方向, 各个移动终端完全独立, 一种方式是各个基站之间进行联合数据接收处理, 通过联合检测的方式, 消除用户间的 干扰并分离出各个用户的信号。采用这种方式进行干扰消除需要的带宽比下行待发数据 共享所需带宽更大, 在实际系统中同样会造成很高的费用。
这样, 无论是上行还是下行, 在不共享待发射数据的前提下消除小区间干扰, 对运 营商来说都是最经济可行的实现方案。 另外, 在采用中继站 (Relay Station ) 的情况 下,由于中继站之间通常没有直接的互连链路,因此多个中继站之间的相互干扰的抑制, 也需要采用不共享待数据的干扰抑制技术。 实际上, 这类问题都可归结为 K-用户 MIM0 (多输入多输出, Multiple Input and Multiple Output ) 干扰信道模型的干扰消除。 在 K用户干扰信道模型中, 发射源数和用户数均为 K, 每个发射源的天线数为^ 每个 用户的接收天线数为 Ν, 发射源之间和用户之间无数据共享, 即每个发射端都只知道自 己用户 (或接收端) 的数据, 而不知道其它用户 (或接收端) 的数据, 因此, 只能通过 对自己用户数据的预编码处理, 来实现用户间的干扰抑制。
干扰对齐是解决 Κ用户干扰信道模型的干扰消除问题的主要技术途径,其基本思想 是第 i个用户所接收到来自其它发射端的干扰向量尽可能对齐, 从而得到尽可能小的干 扰空间, 从而实现干扰消除。 但是, 线性干扰对齐技术目前仍处于研究的初始阶段, 如 何有效实现对任意用户数, 任意天线数的干扰对齐的问题没有解决。 发明内容
本发明实施例提供对任意用户数、 任意天线数的干扰对齐的通用方法。
本发明实施例提供一种干扰消除方法, 包括:
发射端获取每个用户的干扰向量, 第 k个用户的干扰向量为 Hfa.W;m, 其中, k,i,m, 均为正整数, 且满足 1 ≤k≤K , k≠i , l≤m≤Lk , m为信号流数的索引, K为用户数, ^为第 k个用户的信号流数, Hfa.为第 i个发射端到第 k个用户的信道矩阵, 为第 i 个发射端信号流数索引为 m的预编码向量, ^为第 k个用户的信号流数;
对每一个用户, 得到至少 L - N个线性组合关系, 所述线性组合为被对齐干扰向量 与其余 N - LA个干扰向量的线性组合, N为用户的接收天线数, L为所有用户的信号流 数和;
由所有用户的线性组合关系, 得到所有发射端的预编码向量;
发送经所述预编码向量预编码后的信号。
本发明实施例提供一种干扰消除方法, 包括:
发射端获取每个用户的干扰向量, 第 k个用户的干扰向量为 其中, k,i,m, 均为正整数, 且满足 1 ≤k≤K , k≠i , l≤m≤Lk , m为信号流数的索引, K为用户数, L¾为第 k个用户的信号流数, HK为第 i个发射端到第 k个用户的信道矩阵, 为第 k 个用户信号流数索引为 m的接收滤波向量, L¾为第 k个用户的信号流数, (.)Η表示对矩 阵取共轭转置;
对每一个用户, 得到至少 L - M个线性组合关系, 所述线性组合为被对齐干扰向量 与其余 M - L¾个干扰向量的线性组合, M为发射端的发射天线数, L为所有用户的信号 流数和;
由所有用户的线性组合关系, 得到所有用户的接收滤波向量。
相应地, 本发明实施例提供一种数据发射装置, 包括:
干扰向量获取单元, 用于获取每个用户的干扰向量, 第 k 个用户的干扰向量为 ΗΛ , 其中, k, i, m,均为正整数, 且满足 1 ≤k≤K , k≠i , l≤m≤Lk, m为信号流 数的索引, K为用户数, L¾为第 k个用户的信号流数, HK为第 i个发射端到第 k个用 户的信道矩阵, wim为第 i个发射端信号流数索引为 m的预编码向量, L¾为第 k个用户 的信号流数; 线性组合关系获取单元, 用于对每一个用户, 得到至少 L - N个线性组合关系, 所 述线性组合为被对齐干扰向量与其余 N - L¾个干扰向量的线性组合, N为用户的接收天 线数, L为所有用户的信号流数和;
预编码向量获取单元, 用于由所有用户的线性组合关系, 得到所有发射端的预编码 向量;
发送单元, 用于发送经所述预编码向量预编码后的信号。
本发明实施例提供另外一种数据发射装置, 包括:
干扰向量获取单元, 用于获取每个用户的干扰向量, 第 k 个用户的干扰向量为 H^gkm , 其中, k,i,m,均为正整数, 且满足 1 ≤k≤K , k≠i , l≤m≤Lk , m为信号流 数的索引, K为用户数, L¾为第 k个用户的信号流数, HK为第 i个发射端到第 k个用 户的信道矩阵, 为第 k个用户信号流数索引为 m的接收滤波向量, L¾为第 k个用户 的信号流数, (.)Η表示对矩阵取共轭转置;
线性组合关系获取单元, 用于对每一个用户, 得到至少 L - M个线性组合关系, 所 述线性组合为被对齐干扰向量与其余 M - L¾个干扰向量的线性组合, M为发射端的发射 天线数, L为所有用户的信号流数和;
接收滤波向量获取单元, 用于由所有用户的线性组合关系, 得到所有用户的接收滤 波向量。
本发明实施例提供的干扰消除方法及数据发射装置, 可以针对任意用户数、 任意天 线数的通信系统进行干扰消除, 并提供了干扰对齐的实现条件, 应用于小区间干扰消除 可以大大降低运营商成本, 采用较小的代价, 获得系统性能的提高。 附图说明 图 1为本发明实施例干扰消除方法流程图;
图 2为本发明实施例另一干扰消除方法流程图;
图 3为本发明实施例干扰对齐示意图;
图 4为本发明实施例发射端装置结构图;
图 5为本发明实施例另一发射端装置结构图。 具体实施方式 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, 所描述的实施例仅仅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作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。
参见图 1, 本发明实施例提供一种干扰消除方法, 运用于无线通信系统中发射端干 扰消除, 包括:
5101, 发射端获取每个用户的干扰向量, 第 k个用户的干扰向量为 Hfa^m, 其中, k, i,m,均为正整数, 且满足 1 ≤k≤K , k≠i , l<m<Lk, m为信号流数的索引, K为 用户数, L¾为第 k个用户的信号流数, HK为第 i个发射端到第 k个用户的信道矩阵, wim 为第 i个发射端的信号流数索引为 m的预编码向量, L¾为第 k个用户的信号流数; 这里发射端可以为基站、 中继站、 用户设备等, 用户指与发射相对应的接收端, 如 终端。 第 i个用户的干扰向量指除第 i个用户的发射端之外, 其它发射到第 i个用户的 信道矩阵与预编码向量的乘积。
5102, 对每一个用户, 得到至少 L-N个线性组合关系, 所述线性组合为被对齐干 扰向量与其余 N-L¾个干扰向量的线性组合, N为用户的接收天线数, L为所有用户的 信号流数和;
可以将组合系数简单设置为 0或 1, 每个线性组合可以得到一个线性方程。
S103, 由所有用户的线性组合关系, 得到所有发射端的预编码向量;
对所有用户, 联立 S102 中得到的方程, 得到方程组, 其未知数为每个发射端的预 编码向量, 求解该方程组得到所有基站的预编码向量。
S104, 发送经所述预编码向量预编码后的信号。
本发明实施例还提供一种运用于接收端的干扰消除方法, 与发射端的干扰消除方法 呈对偶关系。 参见图 2, 包括:
S201, 发射端获取每个用户的干扰向量, 第 k个用户的干扰向量为
Figure imgf000006_0001
, 其中, k, i,m,均为正整数, 且满足 1 ≤k<K , k≠i , l<m<Lk, m为信号流数的索引, K为 用户数, Lk为第 k个用户的信号流数, HK为第 i个发射端到第 k个用户的信道矩阵, gkm 为第 k个用户信号流数索引为 m的接收滤波向量, L¾为第 k个用户的信号流数, (.f表 示对矩阵取共轭转置;
5202, 对每一个用户, 得到至少 L-M个线性组合关系, 所述线性组合为被对齐干 扰向量与其余 M-L¾个干扰向量的线性组合, M为发射端的发射天线数, L为所有用户 的信号流数和;
可以将组合系数简单设置为 0或 1, 每个线性组合可以得到一个线性方程。
5203, 由所有用户的线性组合关系, 得到所有用户的接收滤波向量。
对所有用户, 联立 S102 中得到的方程, 得到方程组, 其未知数为每个用户的接收 滤波向量, 求解该方程组得到所有用户的接收滤波向量。
与基于发射端干扰对齐不同的是, 这里是求解每个用户的接收滤波向量。
本发明实施例基于干扰对齐的基本思想, 即将第 i个用户所接收到来自其它发射端 的干扰向量尽可能对齐, 从而得到尽可能小的干扰空间, 实现任意天线数, 任意用户数 的干扰消除。
下面详细介绍本发明实施例的干扰消除方法。 本发明实施例的信道模型采用 κ一用 户 MIM0干扰信道模型, 即作为发射端的基站数目和作为接收端的用户数目均为 K,每个 基站的天线数为 ^ 每个用户的接收天线数为 Ν, 基站之间和用户之间无数据共享, 即 每个发射端都只知道自己接收端的数据, 而不知道其它接收端的数据, 因此, 只能通过 对自己接收端数据的预编码处理, 来实现用户间的干扰抑制。 当然, 本发明实施例不限 于 Κ一用户 MIM0干扰信道模型, 其他信道模型原理一样, 此不赘述。
第 k个用户接收的信号可以表示为:
y Μ^ + Η 2^·¾ +〜+ ΗΜ^ (i) 其中, 表示第 i个基站到第 k个用户的信道矩阵, 维数为 NxM; 为第 i个 基站的预编码向量, 维数为 Mxl, 表示发送的信号, 为一标量, 为方差为 σ2的噪 声向量。
用户的线性接收总能表示各接收天线接收信号的加权和,第 k个用户接收信号的估 计为:
Figure imgf000007_0001
+ §λ ΗΗ„2 +〜)+§λ Ηηλ (2) 其中, 为一个 1行 Ν列的向量用于加权。 当 |gA|2=l时, 的选择并不改变噪声 的功率, 则获得 的最佳估计的一个必要条件是:
Figure imgf000008_0001
, 有: gfH„0, 对于
g H«w ,= q , 为正数, 且最大化
对于第 k个用户,当 ^确定时,要满足 gfHfa.w ι=0|ι≠,, = 1,2,···, ,令 a ,= Hfa.w, 则有 gfa ι=0|ι≠,, 其中 a ¾^, 可以得到如下含 K个方程的线性方程组:
= 0
(3)
= 0
Figure imgf000008_0002
为了保证 (3)有非零解, 则必须使得上述 Κ个方程中, 至少有 Κ Ν个干扰迫零方 程的系数向量是除第 k个方程外其余 N 1个干扰迫零方程的系数向量的线性组合, 即 为干扰对齐的约束条件, 其中, 干扰迫零方程是指(3) 中除第 k个方程外其余 N 1个 右边为零的方程。 对于一个用户只接收到一路信号的单流情况, 有:
Figure imgf000008_0003
其中 k = l,2,'-',K , i, St7 , 表示组合系数, St
上面为了描述简便, 以单流为例, 即每个用户只接收一路信号, 也即每个用户的信 号流数为 1。 当然, 可以将单流的情形推广到多流, 即第 k个用户的信号流数为 LA。 这 时, 对每一个用户, 得到至少 L-N个线性组合关系, 所述线性组合为被对齐干扰向量 与其余 N-LA个干扰向量的线性组合, N为用户的接收天线数, L为所有用户的信号流 数和。 可以推出, 当所有用户的信号流数之和的上界为 的向下取整值和 H的
NK-M 2
N2K NK
向下取整值的最小值时, 即上界为 min }, 可以实施上面的干扰消除方
NK-M 法, L」表示向下取整。
图 3为一种干扰对齐方法示意图, M=6, N=3, K=5, 即有 5个基站, 5个用户, 每个 用户的接收天线数为 3。 对单流的每个用户来说, 因接收天线数为 3, 则接收信号向量 呈 3维, 除去有用信号 1维之外, 还剩 2维, 则 4个干扰向量中的任意 3个线性相关。
参见图 3,对于第 1个用户,即第 1行, H14w4是需要对齐的干扰向量, 42^23^3的线性组合, 可以表示为
H14w4 = anH12w2 + a12H13w3 (5)
同样, H15w5是第二个需要对齐的干扰向量, 5^52^23的线性组合, 可以表示为
H15w5 = a13H12w2 + a14H13w3 (6)
对第一个用户, 被对齐的干扰向量数为 K N=2; 剩余干扰向量个数为 N 1 = 2。 同 样, 对第二、 三、 四、 五个向量, 可以得到多个形如 (5), (6) 的方程, 得到方程组, 求解可以得出每个预编码向量。
选取 „为 0或 1, 可以简化线性方程组, 进而获得每个基站的预编码向量, 做相应 的预编码后由基站发送出去。
对于 M=N=3, K = 4, 总的信号流数 L = 4, 式 (4) 可以表示成如下的线性方程组: ― 0 «^123
(7)
«3Η31 3Η32 0 -Η w3
Α 0 可以简单选取各组合系数, 求解得到 W
对于 M=N=4, K = 4, 总的信号流数 L = 5, 四个用户的信号流数分别为 2, 1, 1, 1, 由式 (4) 可以得到如下线性方程组, 进而求解得到
0 0 AH12
Α 0 -H.
(8)
0 ,3H
w3
«4Η41 A 0 求出 后, 可以确定各个发射基站的预编码向量, 这样, 第 i个发射端到第 k个 接收端的等效信道矩阵就是 (Hfa.Wi), 每个接收端就可以已知的等效信道矩阵, 选择合 适的接收机对有用信号进行接收, 如最小均方误差接收机、 最大似然接收机、 串行干扰 消除接收机等。 得到 wA后, 可以进一步求出每个用户的接收滤波向量 , 为
∑Hfa.WiwfH«+ 2I HttWi Hfa.Wiwf +(x2I ttwt, 其中, σ2表示噪 声方差, 为 >< 单位矩阵, (.)Η表示对矩阵取共轭转置, C)—1表示对矩阵求逆。
本发明实施例还对上面方程组的求解方法作进一步的介绍。
对于 (7), 由于 , )可以灵活取值, 为了简便, 本发明实施例取 Α,Α,«3均为 0, 容易得到: — H34W (9)
且,
H14W4 = ¾ ( ¾ 、
ι ι ι ι (10) 取 二 , 则^是下面 3x3矩阵
H14^3- ¾12113- 4 + «4«2- ¾13 24广的特征向量,通过现有的特征向量的求 法, 可以得到 w4, 进而可以由 (9) 得到其他各预编码向量。
可以看到, 上面各式中具有可调节的系数, 这使得每个发射端都可以独立控制发射 功率, 而不改变干扰对齐的关系。
对于( 8 ), 把 w4当作预定义的向量, 表示为 w4 = ( 4 , eM , eM , eM ), 是 0到 1π之 间的辐角, 通过变形, 得到如下方程组:
Figure imgf000010_0001
βγΊΊ,ο^,β44皆为 0, 容易解出: Wl = «4> Ή41Ή4:
Wl
(12)
W2 : 3Η 44
ΐΗ 3 ΐΗ i4w4 再以 M = N = 4, K 3, L = 6, 每个用户传输的信号流数为 2, 2, 2为例, 各用户 的接收信号分别为:
+H12W2x2 +H13W3x3 +n1
+ H22W2x2 + H23W3x3 + n2 (13)
Figure imgf000011_0001
其中: ¾是4><4的对角矩阵, WA =[wA1 wA2]是 4x2的预编码矩阵, 是 2x1的 要实现干扰对齐, 则应满足如下线性方程组:
H13W3
H23W3 H21WA (14) :H„W,D, 可以进一步表示为:
Figure imgf000011_0002
令丁 = D2=diag{^, 2}, D1 =D 则\^ =[w 的两个特征向量, 即:
Twn =^wn, Tw12=22w12
一旦求得 W1; 则可根据下式求得其它的预编码向量:
(17)
W, =H;1H„W,D,
本发明实施例还从接收端的角度介绍干扰消除的方法, 与上面介绍的发射端的 干扰消除方法互为对偶, 此时求解的不是发射端的预编码向量, 而是用户侧的接收滤波 向量 。 对于单流的情况, 为了消除干扰, 有
Figure imgf000012_0001
Figure imgf000012_0002
, 其中 bA = kl,m 可以得到如下含 K水 方程的线性方程组:
Figure imgf000012_0003
为了保证该线性方程组有非零解, 则必须使得上述 K个方程中, 有 K一 M个干扰迫 零方程的系数向量是除第 k个方程外其余 M— 1个干扰迫零方程的系数向量的线性组合, 即为干扰对齐的约束条件:
Figure imgf000012_0004
其中 k = i,2 ..,K, |^WM eri2
Figure imgf000012_0005
, „表示组合系数, ΓίΊ表 示含 M-1个元素的被对齐干扰向量集合, Γ;,表示含 Κ-Μ个元素的剩余干扰向量集合,
ΜλΚ 且 Γ;1 r;, ίΐ,2,···, }。类似地, 可以推导出,用户的总流数的上界为. 的
ΜΚ-Ν
ΜΚ ΜλΚ
向下取整值和 的向下取整值的最小值时, 即上界为 minj ≡ }, 可以
2 ΜΚ-Μ 2 实现干扰对齐, L」表示向下取整。
更一般地, 推广到多流的情况, 对每一个用户, 可以得到至少 L-M个线性组合关 系, 所述线性组合为被对齐干扰向量与其余 M-LA个干扰向量的线性组合, M为发射端 的发射天线数, L为所有用户的信号流数和。
以 M=N=3, K = 4, 单流的情况为例, 由 (19) 可以得到:
Figure imgf000013_0001
的特征向量, 通过现有的特征向量的求法, 可以得到 , 进而可以由 (21)得到其 他各接收滤波向量。
对于 Μ=Ν=4, κ=4, L = 5的情况, 第一个用户的信号流数为 2, 这时有
(24)
Figure imgf000013_0002
通过选择预先定义的接收滤波向量 , (24) 可以变形为
Figure imgf000013_0003
^β,,α,,χ,,α,,β,,β^γ,皆为 0, 容易解出:
Figure imgf000014_0001
对于 M = N = 4, K = 3, L = 6, 每个用户传输的信号流数为 2, 2, 2的情形, 有
H3 a 1G3 =¾G2D1
Figure imgf000014_0002
=H¾,D,
Gk =[gkl gk2] , k=l, 2, 3, , , 均为 )^的矩阵, 容易得出:
和& 2是 4x4
Figure imgf000014_0003
矩阵 T的两个特征向量。 接下来的解法与 (16)、 (17) 类似。
对于接收端的干扰消除方法, 计算出接收滤波向量后, 可以进一步计算出发射端的 预编码向量, 第 k 个发射端的预编码向量17''为「"^ΗΑ ^¾+σ2ΙΜ) 11 或
∑ H igkg Hki+ 2lM H g;,其中, 表示噪声方差, /Μ ΜχΜ单位矩阵, (.
Figure imgf000014_0004
表示对矩阵取共轭转置, (,)—1表示对矩阵求逆。
本发明实施例还提供一种判断采用何种干扰消除方法的方法, 即有些情况下优先采 用发射端的干扰消除方法, 有些情况下采用接收端的干扰消除方法。 具体为:
若发射机发射天线数 Μ小于或等于用于接收天线数 Ν, 则
发射端获取每个用户的干扰向量, 第 k个用户的干扰向量为 Hfa.w;m, 其中, k≠i , «7 = 1,2,···, LA, k、 i为正整数, k=l, 2, …… K, Κ为用户数, Hfa.为第 i个发射端到第 k个用户的信道矩阵, w;m为第 i个发射端的预编码向量, LA为第 k个用户的信号流数; 对每一个用户, 得到至少 L-N个线性组合关系, 所述线性组合为被对齐干扰向量 与其余 N-Lt个干扰向量的线性组合, N为用户的接收天线数, L为所有用户的信号流
N2K
数和, 且 L满足 L< , 「·」表示向下取整数值;
NK-M 由所有用户的线性组合关系, 得到所有发射端的预编码向量;
发送经所述预编码向量预编码后的信号;
若发射机发射天线数 M大于用于接收天线数 N, 则
发射端获取每个用户的干扰向量, 第 k个用户的干扰向量为
Figure imgf000015_0001
其中, k≠i, «7 = 1,2,···, LA, k、 i为正整数, k=l, 2,…… K, m为信号流数的索引, K为用户数, gkm 为第 k个用户的接收滤波向量, LA为第 k个用户的信号流数, (.)Η表示对矩阵取共轭转 对每一个用户, 得到至少 L-M个线性组合关系, 所述线性组合为被对齐干扰向量 与其余 个干扰向量的线性组合, Μ 为发射端的发射天线数, 且 L 满足
ΜλΚ
L<
ΜΚ-Ν 由所有用户的线性组合关系, 得到所有用户的接收滤波向量。
本发明实施例提供的基于发射端和基于接收端的干扰消除方法, 可以针对任意用户 数、 任意天线数的通信系统进行干扰消除, 应用于小区间干扰消除可以大大降低运营商 成本, 采用较小的代价, 获得系统性能的提高。
相应地, 本发明实施例还提供一种数据发射装置, 如基站。 参见图 4, 包括: 干扰向量获取单元 401, 用于获取每个用户的干扰向量, 第 k个用户的干扰向量为 Hkiwim , 其中, k, i,m,均为正整数, 且满足 1 ≤k<K, i, \<m<Lk, m为信号流 数的索引, K为用户数, LA为第 k个用户的信号流数, Hfa.为第 i个发射端到第 k个用 户的信道矩阵, w;m为第 i个发射端信号流数索引为 m的预编码向量, LA为第 k个用户 的信号流数;
线性组合关系获取单元 402, 用于对每一个用户, 得到至少 L-N个线性组合关系, 所述线性组合为被对齐干扰向量与其余 N-LA个干扰向量的线性组合, N为用户的接收 天线数, L为所有用户的信号流数和; 编码向量;
发送单元 404, 用于发送经所述预编码向量预编码后的信号。
所述装置还可以进一步包括接收滤波向量获取单元,用于根据预编码向量获取单元 获取的预编码向量, 得到所有用户的接收滤波向量, 第 k 个用户的接收滤波向量 为 ∑Hfa.w;wfH + σ2Ι HttWi + σ2Ι , H„wt, 其中, 表示噪
Figure imgf000016_0001
声方差, 为 >< 单位矩阵, (.)H表示对矩阵取共轭转置, C)—1表示对矩阵求逆。
与接收端干扰消除方法对应,本发明实施例还提供另一种数据发射装置,参见图 5, 包括:
干扰向量获取单元 501, 用于获取每个用户的干扰向量, 第 k个用户的干扰向量为 H i ghn , 其中, k,i,m,均为正整数, 且满足 1 ≤k≤K , k≠i , l < m < Lk , m为信号流 数的索引, K为用户数, LA为第 k个用户的信号流数, Hfa.为第 i个发射端到第 k个用 户的信道矩阵, m为第 k个用户信号流数索引为 m的接收滤波向量, LA为第 k个用户 的信号流数, (.)Η表示对矩阵取共轭转置;
线性组合关系获取单元 502, 用于对每一个用户, 得到至少 L - M个线性组合关系, 所述线性组合为被对齐干扰向量与其余 M - LA个干扰向量的线性组合, M为发射端的发 射天线数, L为所有用户的信号流数和;
接收滤波向量获取单元 503, 用于由所有用户的线性组合关系, 得到所有用户的接 收滤波向量。
进一步地, 该装置还可以包括预编码向量获取单元, 用于根据接收滤波向量获取单 元获取的接收滤波向量, 得到所有发射端的预编码向量, 第 k个发射端的预编码向量 其中, σ2表示噪
Figure imgf000016_0002
声方差, 为 >< 单位矩阵, (.f表示对矩阵取共轭转置, 表示对矩阵求逆。
本发明实施例提供的数据发射装置可以具体为基站、 中继站、 用户设备、 移动终端 等。 可以针对任意用户数、 任意天线数的通信系统进行干扰消除, 应用于小区间干扰消 除可以大大降低运营商成本, 采用较小的代价, 获得系统性能的提高。
本申请文件中所公开的实施例描述的各单元及算法步骤, 能够以电子硬件、 计算机 软件或者二者的结合来实现, 为了清楚地说明硬件和软件的可互换性, 在上述说明中已 经按照功能一般性地描述了各示例的组成及步骤。这些功能究竟以硬件还是软件方式来 执行, 取决于技术方案的特定应用和设计约束条件。 专业技术人员可以对每个特定的应 用来使用不同方法来实现所描述的功能,但是这种实现不应认为超出本发明实施例的范 围。
结合本文中所公开的实施例描述的方法或算法的步骤可以直接用硬件、处理器执行 的软件模块, 或者二者的结合来实施。 软件模块可以置于随机存储器 (RAM)、 内存、 只 读存储器 (R0M)、 电可编程 R0M、 电可擦除可编程 R0M、 寄存器、 硬盘、 可移动磁盘、 CD-ROM, 或技术领域内所公知的任意其它形式的存储介质中。

Claims

权 利 要 求
1、 一种干扰消除方法, 其特征在于, 包括:
发射端获取每个用户的干扰向量, 第 k个用户的干扰向量为 Hfa.vv;m, 其中, k,i,m, 均为正整数, 且满足 1 ≤k≤K , k≠i, l≤m≤Lk, m为信号流数的索引, K为用户数, 为第 k个用户的信号流数, Hfa.为第 i个发射端到第 k个用户的信道矩阵, 为第 i 个发射端信号流数索引为 m的预编码向量;
对每一个用户, 得到至少 L-N个线性组合关系, 所述线性组合为被对齐干扰向量 与其余 N-LA个干扰向量的线性组合, N为用户的接收天线数, L为所有用户的信号流 数和;
由所有用户的线性组合关系, 得到所有发射端的预编码向量;
发送经所述预编码向量预编码后的信号。
2、 根据权利要求 1所述的方法, 其特征在于, =1时, 所述线性组合关系为:
Figure imgf000018_0001
„表示组合系数, SA1表示含 N-1个元素的被对齐干扰向量集合, 2表示含 K-N个元 素的剩余干扰向量集合, 且 = {1,2,···,^}。
3、 根据权利要求 2所述的方法, 其特征在于, 所述由所有用户的线性组合关系, 得到所有发射端的预编码向量, 包括:
联立所有用户的线性组合关系, 得到一个含 Κ个方程的方程组, 求解所述方程组得 到所有发射端的预编码向量。
4、 根据权利要求 1 所述的方法, 其特征在于, 所有用户的流数和的上界为
N2K NK
min }, 其中 M表示发射端的发射天线数, I I表示向下取整
NK-M
5、 根据权利要求 1所述的方法, 其特征在于, 所述方法还包括:
由所述得到的预编码向量, 得到所有用户的接收滤波向量, 第 k个用户的接收滤波 向量 ΗΛ, 或 g. ∑ H,w;wf¾ + (T2I Httwt
Figure imgf000018_0002
其中, σ2表示噪声方差, 为 >< 单位矩阵, (.)Η表示对矩阵取共轭转置, C)—1表示 对矩阵求逆。
6、 一种干扰消除方法, 其特征在于, 包括:
发射端获取每个用户的干扰向量, 第 k个用户的干扰向量为
Figure imgf000019_0001
其中, k,i,m, 均为正整数, 且满足 1 ≤k≤K , k≠i, \<m<Lk, m为信号流数的索引, K为用户数, LA为第 k个用户的信号流数, Hfa.为第 i个发射端到第 k个用户的信道矩阵, m为第 k 个用户信号流数索引为 m的接收滤波向量, LA为第 k个用户的信号流数, (.)Η表示对矩 阵取共轭转置;
对每一个用户, 得到至少 L-M个线性组合关系, 所述线性组合为被对齐干扰向量 与其余 M-LA个干扰向量的线性组合, M为发射端的发射天线数, L为所有用户的信号 流数和;
由所有用户的线性组合关系, 得到所有用户的接收滤波向量。
7、 根据权利要求 6所述的方法, 其特征在于, ^ = 1时, 所述线性组合关系为: , = ·™ Α,其中 '· = ι,υ, r;1, 一 er m m=l
表示组合系数, Γ;1表示含 M-1个元素的被对齐干扰向量集合, Γ;2表示含 Κ-Μ个元素的 剩余干扰向量集合, 且 Γ;1υΓ;2υ{0 = {1,2,
8、 根据权利要求 7所述的方法, 其特征在于, 所述由所有用户的线性组合关系, 得到所有发射端的预编码向量, 包括:
联立所有用户的线性组合关系, 得到一个含 K个方程的方程组, 求解所述方程组得 到所有发射端的预编码向量。
9、 根据权利要求 6 所述的方法, 其特征在于, 所有用户的信号流数和的上界为
ΜλΚ ΜΚ
min }, 其中 Μ表示发射端发射天线数,
ΜΚ-Μ I I表示向下取整 ;
10、 根据权利要求 6所述的方法, 其特征在于, 所述方法还包括:
由所述得到的接收滤波向量, 得到所有发射端的预编码, 第 i个发射端的预编码向
. w. + σ21, H g;, 其中,
Figure imgf000019_0002
σ2表示噪声方差, 为 >< 单位矩阵, (.f表示对矩阵取共轭转置, (.)- 1表示对矩 阵求逆。
11、 一种数据发射装置, 其特征在于, 包括:
干扰向量获取单元, 用于获取每个用户的干扰向量, 第 k 个用户的干扰向量为
Hkiwim , 其中, k, i,m,均为正整数, 且满足 1 ≤k<K, i, \<m<Lk, m为信号流 数的索引, K为用户数, LA为第 k个用户的信号流数, Hfa.为第 i个发射端到第 k个用 户的信道矩阵, w;m为第 i个发射端信号流数索引为 m的预编码向量, LA为第 k个用户 的信号流数;
线性组合关系获取单元, 用于对每一个用户, 得到至少 L-N个线性组合关系, 所 述线性组合为被对齐干扰向量与其余 N-LA个干扰向量的线性组合, N为用户的接收天 线数, L为所有用户的信号流数和;
预编码向量获取单元, 用于由所有用户的线性组合关系, 得到所有发射端的预编码 向量;
发送单元, 用于发送经所述预编码向量预编码后的信号。
12、 根据权利要求 11所述的装置, 其特征在于, 还包括:
接收滤波向量获取单元, 用于根据预编码向量获取单元获取的预编码向量, 得到所 有 用 户 的 接 收 滤 波 向 量 , 第 k 个 用 户 的 接 收 滤 波 向 量 gA
∑Hfa.w;wfH +σ2Ι H„„w, + σ2Ι, ΗΛ, 其中, σ2表示噪
Figure imgf000020_0001
声方差, 为 >< 单位矩阵, (.)H表示对矩阵取共轭转置, C)—1表示对矩阵求逆。
13、 一种数据发射装置, 其特征在于, 包括:
干扰向量获取单元, 用于获取每个用户的干扰向量, 第 k 个用户的干扰向量为 Highn, 其中 k,i,m,均为正整数, 且满足 1 ≤k≤K , k≠i, \<m<Lk, m为信号流数 的索引, K为用户数, LA为第 k个用户的信号流数, Hfa.为第 i个发射端到第 k个用户 的信道矩阵, m为第 k个用户信号流数索引为 m的接收滤波向量, LA为第 k个用户的 信号流数, (.)Η表示对矩阵取共轭转置;
线性组合关系获取单元, 用于对每一个用户, 得到至少 L-M个线性组合关系, 所 述线性组合为被对齐干扰向量与其余 M-LA个干扰向量的线性组合, M为发射端的发射 天线数, L为所有用户的信号流数和; 接收滤波向量获取单元, 用于由所有用户的线性组合关系, 得到所有用户的接收滤 波向量。
14、 根据权利要求 13所述的装置, 其特征在于, 还包括:
预编码向量获取单元, 用于根据接收滤波向量获取单元获取的接收滤波向量, 得到 所有发射端 的预编码 向 量 , 第 k 个发射端 的预编码 向 量 w; 为 H g;, 其中, σ2表示噪声
Figure imgf000021_0001
方差, 为 >< 单位矩阵, f表示对矩阵取共轭转置, (.)— 1表示对矩阵求逆(
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