WO2013078743A1 - Procédé et dispositif de génération de matrice de précodage pour système mimo multiutilisateur multipoint coordonné - Google Patents

Procédé et dispositif de génération de matrice de précodage pour système mimo multiutilisateur multipoint coordonné Download PDF

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Publication number
WO2013078743A1
WO2013078743A1 PCT/CN2011/084462 CN2011084462W WO2013078743A1 WO 2013078743 A1 WO2013078743 A1 WO 2013078743A1 CN 2011084462 W CN2011084462 W CN 2011084462W WO 2013078743 A1 WO2013078743 A1 WO 2013078743A1
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WO
WIPO (PCT)
Prior art keywords
user
matrix
base station
channel
precoding
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Application number
PCT/CN2011/084462
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English (en)
Chinese (zh)
Inventor
李立华
张平
王化磊
王骥
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北京邮电大学
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Publication of WO2013078743A1 publication Critical patent/WO2013078743A1/fr

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Classifications

    • 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
    • H04B7/022—Site diversity; Macro-diversity
    • H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
    • 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
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0032—Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
    • H04L5/0035—Resource allocation in a cooperative multipoint environment

Definitions

  • the present invention relates to the field of wireless mobile communication technologies, and in particular, to a precoding method and a matrix generation method for a coordinated multi-point user MIMO system. Background technique
  • MIMO Multiple-Input Multiple-Output
  • MU-MIMO Multiple-Input Multiple-Output
  • MU-MIMO multi-antenna diversity gain can effectively reduce the system error rate, and multi-antenna multiplexing gain expands the capacity area of multi-user systems.
  • MU-MIMO usually uses the transmitter precoding technology to transmit information of multiple users on the same time and frequency resources by using Spatial Division Multiple Access (SDMA) technology.
  • SDMA Spatial Division Multiple Access
  • CoMP Coordinated Multipoint
  • CB Coordinated beamf orming
  • JP Joint processing
  • the JP technology can effectively improve the performance of the system by co-precoding of the coordinated cell.
  • CoMP MU-MIMO since each cell base station simultaneously transmits data to multiple clients, multiple users share the same time-frequency resource, and there must be inter-user interference in the system, including inter-cell interference and intra-cell interference. Therefore, user interference and noise are the same, which greatly affects the performance of the system.
  • ZF-CI Zero forcing channel inversion
  • MMSE-CI Minimum mean-squared error channel inversion
  • MMSE-CI Minimum mean-squared error channel inversion
  • Receive antenna Receive antenna.
  • BD Block Diagonolization precoding technique is proposed to completely eliminate interference between users, and each user at the receiving end can have more than one antenna.
  • the BD technology must satisfy the case where the number of antennas at the transmitting end is greater than or equal to the sum of the number of receiving antennas of all users.
  • the BD technology is not suitable for the case where each user at the receiving end has an arbitrary receiving antenna. Moreover, BD technology It only eliminates the interference between users, and does not consider the influence of noise on system performance. Therefore, when the signal-to-noise ratio is reduced, its performance is relatively poor. Summary of the invention
  • the object of the present invention is to enable each user of a CoMP MU-MIMO system to have an arbitrary root receiving antenna, and to reduce the influence of interference and noise between users on the system, and to improve system performance, especially when the noise is large.
  • the present invention provides a precoding method for a coordinated multipoint multi-user MIMO system, comprising the following steps:
  • S3 The central control station performs LQ decomposition on the matrix to obtain a unitary matrix
  • S4 The central control station multiplies the sub-matrix ⁇ : conjugate transpose of ⁇ ,. by H,. to obtain the equivalent letter of each user.
  • step S1 further comprises the steps of:
  • the central control station obtains the noise power between the base station n and the user i according to the transmission power obtained from each base station, and the signal-to-noise ratio SNR, and obtains the noise power of the user i according to ⁇ 7 ⁇ ,.
  • step S14 further comprises the steps of:
  • step S2 Preferably, in the step S2:
  • step S5 further comprises the steps of:
  • step S6 further comprises the steps of:
  • : ⁇ , ,:) represents a submatrix consisting of the ⁇ ; , + 1 to U lines of the matrix w;
  • the invention also provides a precoding matrix generating device for a coordinated multi-point multi-user MIMO system, comprising an obtaining module, a calculating module and a generating module:
  • the acquiring module is configured to acquire transmit power, channel information ⁇ , ⁇ , ⁇ , ⁇ ) from each cell base station; where ⁇ ology,, ⁇ represents channel information between the cell ⁇ and the user i, SNR lake,, represents the signal to noise ratio between cell n and user i;
  • the calculating module is configured to calculate channel information H, and noise power of the user
  • the generating module is configured to generate a precoding matrix of each user according to channel information H, and noise power of each user.
  • the generating module further includes:
  • a channel extension module configured to perform channel extension on a complement channel of each user to obtain a matrix
  • an LQ decomposition module configured to perform LQ decomposition on the matrix, and obtain an effective zero space matrix for each user
  • DRAWINGS Figure 1 is a flow chart of the method of the present invention.
  • FIG. 2 is a schematic structural view of a device of the present invention
  • FIG. 3 is a graph showing a capacity comparison of a precoding method of the present invention and a cooperative multipoint MIMO system based on the BD precoding method according to an embodiment of the present invention.
  • the precoding method of the present invention includes the following steps:
  • the central control station obtains the channel information of each user by combining... V ⁇ 3 ⁇ 4 r ;
  • N is the number of antennas at the transmitting end.
  • the noise power may be different for different users, depending on the transmit power of each base station. Therefore, the present invention is also effectively applicable to a CoMP system in which base station base stations transmit power differently.
  • step S3 the LQ decomposition is performed on the matrix to obtain the lower triangular matrix ⁇ and the ⁇ matrix.
  • the LQ decomposition is used to obtain the triangular matrix Z ⁇ P ⁇ matrix, which reduces the complexity of the transmitting end.
  • Step S4 multiplying the sub-matrix of the 3 ⁇ 4 with the channel information matrix to obtain an equivalent channel ⁇ of each user, which specifically includes the following:
  • Step S5 Perform an SVD decomposition operation on the equivalent channel of each user, and obtain a precoding matrix of each user, which specifically includes the following:
  • the latter is composed of N minus columns, where ⁇ represents the number of receiving antennas of the user, and N is the number of antennas at the transmitting end.
  • the precoding matrix of each user is obtained.
  • the central control station sends the precoding matrix of each base station obtained according to the precoding matrix to each cell base station, and then performs precoding, which specifically includes the following:
  • the matrix w [ ⁇ d ] can be obtained, and its size is Wx ⁇ N Vitamin, where ⁇ represents the number of transmitting antennas of the base station;
  • FIG. 2 is a schematic structural diagram of a CoMP MU-MIMO precoding matrix generating apparatus according to the present invention.
  • the apparatus includes: an obtaining module 10, a calculating module 20, and a generating module 30:
  • the generating module 30 further includes: a channel expansion module 31, an LQ decomposition module 32, an SVD decomposition module 33, and a multiplication module 34.
  • the channel expansion module 31 is configured to perform channel extension on the complement channel of each user, and obtain a matrix LQ decomposition module 32, configured to perform LQ decomposition on the matrix, and obtain a valid zero-space matrix SVD decomposition module 33 for each user, for each user.
  • the equivalent channel ⁇ ⁇ ⁇ ⁇ implement SVO decomposition to obtain the gain matrix of each user ⁇ ; the multiplication module 34 is used to multiply the zero space matrix of each user by its gain matrix to obtain the precoding matrix W of each user.
  • t 3 ⁇ 4.
  • Table 1 The comparison of the complexity is shown in Table 1, where the instance (8, 2, 2, 4) indicates that the sum of the number of transmitting antennas at the base station of the system is ,8, the system has two cells cooperating, and the number of receiving antennas per user is 2. There are 4 users in the system.
  • FIG. 3 a capacity comparison graph of the system (8, 2, 4) based on the precoding method of the present invention and the CoMP MU-MIMO system based on the BD precoding method is shown, the system has 4 users, Each user has 2 receiving antennas, and there are 2 coordinated cells. Each cell base station has 4 transmitting antennas at the transmitting end, and the receiving end uses ZF detection. Under different SNR conditions, the multi-user based on the present invention A simulation comparison of the capacity of the precoding system and the BD multi-user precoding system.
  • the precoding scheme of the present invention can improve the signal to noise ratio of the system better than the BD scheme, thereby increasing the capacity of the system.
  • Table 1 the solution of the present invention has a lower complexity than BD. Furthermore, it shows that this scheme is better implemented than the traditional BD scheme.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Radio Transmission System (AREA)

Abstract

L'invention concerne un procédé et un dispositif de génération de matrice de précodage pour un système MIMO multiutilisateur (MU-MIMO) multipoint coordonné (CoMP), le procédé comprenant les étapes suivantes : S1, une station de commande centrale acquiert en provenance de chaque station de base cellulaire n (n = 1,...,T) une puissance d'émission de station de base Pn (n = 1,...,T), les informations de canal Hn,i entre la station de base n et un utilisateur i, et un rapport signal sur bruit SNRn,i (i = 1,...K), T étant le nombre de cellules coopératives et K étant le nombre d'utilisateurs dans le système, et obtient en outre les informations de canal Hi et la puissance de bruit σi 2 de chaque utilisateur ; S2, acquisition du canal complémentaire H ̅ i de chaque utilisateur sur la base des informations de canal Hi de chaque utilisateur et réalisation d'une extension de canal pour chaque canal complémentaire H ̅ i afin d'obtenir une matrice H ̿ = {H ̅ i,σi/}, / étant la matrice unitaire de la formule I et Mk représentant le nombre d'antennes de réception de l'utilisateur k ; S3, réalisation d'une décomposition LQ pour la matrice H ̅ i afin d'obtenir une matrice unitaire Qi ; S4, réalisation d'une transposition conjuguée pour la sous-matrice Q ̅ i de la matrice unitaire Qi et multiplication de la sous-matrice transposée par Hi afin d'obtenir le canal équivalent Hi equ de chaque utilisateur ; S5, réalisation d'une décomposition SVD pour le canal équivalent Hi equ afin d'obtenir la matrice de précodage Wi (i = 1,...,K) de chaque utilisateur ; et S6, obtention de la matrice de précodage Wn base (n = 1,...,T) de chaque station de base en fonction de la matrice de précodage Wi (i = 1,...,K) de chaque utilisateur et transmission de la matrice de précodage Wn base (n = 1,...,T) à la station de base cellulaire correspondante en vue d'un précodage.
PCT/CN2011/084462 2011-11-30 2011-12-22 Procédé et dispositif de génération de matrice de précodage pour système mimo multiutilisateur multipoint coordonné WO2013078743A1 (fr)

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CN201110391993.6 2011-11-30
CN201110391993.6A CN102412933B (zh) 2011-11-30 2011-11-30 协作多点多用户mimo系统的预编码方法及矩阵生成装置

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CN102629895A (zh) * 2012-04-27 2012-08-08 中国科学技术大学 一种改善数据流间公平性的多播酉预编码方法
CN102938666B (zh) * 2012-11-13 2015-02-18 清华大学 一种下行多小区联合波束成形方法
CN103873125B (zh) * 2012-12-17 2017-09-15 中国移动通信集团公司 一种多天线系统中下行信号的发射方法和设备
CN105703813B (zh) * 2016-02-04 2018-11-09 东南大学 一种mimo系统的预编码方法
CN106712818B (zh) * 2017-01-22 2020-05-08 北京邮电大学 一种预编码矩阵获取方法及装置

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CN101986575A (zh) * 2010-10-28 2011-03-16 北京邮电大学 多用户mimo系统的预编码方法

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CN101741439A (zh) * 2008-11-10 2010-06-16 中兴通讯股份有限公司 一种多点协作传输方法
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CN102412933B (zh) 2014-10-15

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