CN101800582A - Multi-user beam-forming method and device - Google Patents

Multi-user beam-forming method and device Download PDF

Info

Publication number
CN101800582A
CN101800582A CN 200910077635 CN200910077635A CN101800582A CN 101800582 A CN101800582 A CN 101800582A CN 200910077635 CN200910077635 CN 200910077635 CN 200910077635 A CN200910077635 A CN 200910077635A CN 101800582 A CN101800582 A CN 101800582A
Authority
CN
Grant status
Application
Patent type
Prior art keywords
user
beam
doa
information
paired
Prior art date
Application number
CN 200910077635
Other languages
Chinese (zh)
Inventor
郭阳
Original Assignee
中兴通讯股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date

Links

Classifications

    • 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
    • H04B7/08Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0837Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
    • H04B7/0842Weighted combining
    • H04B7/086Weighted combining using weights depending on external parameters, e.g. direction of arrival [DOA], predetermined weights or beamforming

Abstract

The invention discloses a multi-user beam-forming method and device which are applicable to the MIMO wireless communication system based on TDD. In the scheme of the invention, the downlink channel information of each user is obtained according to uplink channel information, the DOA estimation algorithm is adopted to obtain the DOA information of each user according to the downlink channel information; and the users are paired, the users satisfying set constraint conditions constitute a paired user group, the null widening algorithm is adopted to calculate the weight of beam of each user according to the DOA information of each user in the paired user group; and the beam corresponding to the weight of beam of each user has the following properties: main lobe is generated in the corresponding DOA direction of each user, and broad-range nulls are generated in the DOA directions of other users in the paired user group. Only multi-antenna technology and beam null widening technology are used under the condition of not using codes so that at least two users can use the same time, frequency and code resources and the effective reuse of system resources can be realized.

Description

一种多用户波束成形方法及装置 A multi-user beamforming method and apparatus

技术领域 FIELD

[0001]本发明涉及多输入多输出(MIM0,Multiple Input and Multiple Output)无线通信技术,特别是指一种适用于时分双工(TDD,Time Division Duplex)的基于波束零陷展宽的多用户波束成形方法及装置。 Based on the beam nulling wide-beam multi-user development [0001] The present invention relates to multiple input multiple output (MIM0, Multiple Input and Multiple Output) wireless communication technology, particularly to one for time division duplex (TDD, Time Division Duplex) of molding method and apparatus.

背景技术 Background technique

[0002] MIMO无线通信技术,由于其能够有效提高信道容量,而成为长期演进(LTE,Long Term Evolution)研究中一项倍受关注的技术。 [0002] MIMO wireless communication technology, since it is possible to effectively increase the channel capacity, becomes long term evolution (LTE, Long Term Evolution) to study a much attention.

[0003] 波束成形(beam forming)的方法是通过用户所在不同方位来区分用户,从而可以实现多个用户对相同的时间、频率资源进行复用。 [0003] Beamforming (beam forming) is a method to distinguish the user, thereby enabling a plurality of users are multiplexed on the same time frequency resource by the user is different orientations. 对于小天线间距(0.5λ)情况,非常有利于控制波束指向,更加适合于应用波束成形技术。 For small antenna spacing (0.5 [lambda]), the control is very conducive to the beam direction, is more suitable for the application of beamforming techniques. 波束成形技术主要是通过控制波束方向来进行工作的,比较适合用于空旷的郊区场景。 Beamforming technique work is mainly performed by controlling the beam direction, more suitable for open suburban scene. 波束成形可以获得明显的波束能量增益,能够扩大小区的覆盖。 Beamforming can achieve significant beam energy gain, to expand cell coverage. 波束成形技术利用天线阵列结构可以获得特征方向的波束,因此能够获得明显的波束能量增益,这可以完善小区覆盖,减小系统干扰和增加系统容量,提高链路可靠性,提高峰值速率,可以有效改善边沿用户的性能。 Beamforming can be obtained using a technique wherein a beam direction of the antenna array structure, it is possible to achieve significant beam energy gain, which can improve cell coverage, to reduce the system interference and increase system capacity, improve link reliability, enhance the peak rate can be effectively improved edge user performance.

[0004] 对于演进LTE(LTE-A)通信系统而言,可以将现有的单流波束成形技术扩展至多流波束成形技术,再将多流波束分别分配给多个用户使用,这种方法可以用于实现空分多址。 [0004] For purposes of evolution LTE (LTE-A) communication system may be a conventional single-stream beamforming technique extended up stream beamforming technique, and then the multi-beam flow respectively allocated to a plurality of users, this method may be for implementing space division multiple access. 波束成形技术对于多天线空间信道的快速变化的敏感度较低,而且零陷展宽方法可以更加有效的控制用户间的干扰。 Beamforming technique for the rapid changes in the multi-antenna spatial channels of a lower sensitivity, and broadening nulls can be more effective method of control of interference between users.

[0005] 在多用户MIMO模式中,可以通过设计合适的发射天线和接收天线的权值矢量来设计赋形波束的方向,控制波束图的具体形状,可以在期望方向形成主瓣、干扰方向形成零陷,从而对多用户的信号进行区分,去除用户间干扰。 [0005] In a multi-user MIMO mode, may be suitably designed weights transmit antennas and receive antennas value vector design direction shaped beam, the control specific shape of the beam pattern may be formed main lobe in the desired direction to form the interference direction null, thereby differentiate the multiuser signal to remove inter-user interference. MU-BF可以获得多用户复用增益,从而提高小区的吞吐量。 MU-BF is possible to obtain the multi-user multiplexing gain, thereby improving the throughput of a cell.

[0006] 虽然多用户MIMO模式下采用波束成形技术有诸多优点,但是,在不使用编码的情况下,仅仅利用多天线技术,多用户同时同频复用系统资源却一直是尚未解决的难题。 [0006] Although the use of beamforming technique has many advantages, but, without the use of coding, using only the multi-antenna technology, multiple users simultaneously with the frequency multiplexing system resource has been unsolved problem in multi-user MIMO mode.

发明内容 SUMMARY

[0007] 有鉴于此,本发明的主要目的在于提供一种多用户波束成形方法及装置, [0007] In view of this, the main object of the present invention is to provide a multi-user beamforming method and apparatus,

[0008] 为达到上述目的,本发明的技术方案是这样实现的: [0008] To achieve the above object, the technical solution of the present invention is implemented as follows:

[0009] 一种多用户波束成形方法,适用于基于时分双工TDD的多输入多输出MIMO无线通信系统,该方法包含:根据上行信道信息获得每个用户的下行信道信息;采用波达方向DOA估计算法,根据所述下行信道信息获得每个用户的DOA信息,并且,对用户进行配对,满足设定的约束条件的用户组成配对的用户组;采用零陷展宽算法,根据配对的用户组内每个用户的DOA信息计算各用户的波束权值,每个用户的波束权值所对应的波束具有如下性质,在对应用户自己的DOA方向形成主瓣,在配对的用户组内其他用户的DOA方向生成宽零陷。 [0009] A multi-user beamforming method for a TDD based on a multiple input multiple output MIMO wireless communication system, the method comprising: obtaining information based on the uplink channel of each user's downlink channel information; using DOA DOA user estimation algorithm, DOA information obtained for each user according to the downlink channel information, and the pairing of the user, to meet the constraints set by the user of the group consisting of paired; stretch using nulling algorithm, according to the user group pairs DOA information is calculated for each user each user beam weights, the beam weights for each user corresponding to the beam having the following properties, are formed in the main lobe direction DOA their corresponding user, the other users in the user group DOA pairs generating a wide null direction. [0010] 所述根据上行信道信息获得每个用户的下行信道信息,包括:通过对上行检测参考信号SRS的估计获得上行信道信息;利用上行信道与下行信道的互易性,根据上行信道信息获得下行信道信息。 [0010] The according to uplink channel information is obtained for each user's downlink channel information, comprising: obtaining an uplink channel information by estimating the uplink detection reference signal SRS; the use of an uplink channel and a downlink channel reciprocity, obtained according to uplink channel information downlink channel information.

[0011] 所述约束条件为:用户之间的DOA角之差不小于设定值,进一步地,STx天线时,所述约束条件为Δ φ > 10°,4Τχ天线时,所述约束条件为Δ φ > 20°,其中,Δ φ为用户之间的DOA角之差;或者,用户的波束图峰均比不小于设定的峰均比门限,进一步地,所述波束图峰均比是波束图主瓣的增益与波束图增益均值的比值;或者,用户的波束图旁瓣主瓣增益比不小于设定的增益门限,进一步地,所述波束图旁瓣主瓣增益比是最大旁瓣的增益与主瓣增益的比值。 [0011] The constraint condition: the difference between the user DOA angles is not less than the set value, further, when STx antenna, the constraint condition is Δ φ> 10 °, when 4Τχ antenna, the constraint is Δ φ> 20 °, wherein, Δ φ is the difference between the DOA angles user; alternatively, the user's beam pattern PAR PAR is not less than the set threshold, and further, the peak-beam is FIG. mean the ratio of beam gain of the main lobe of the beam pattern gain; or user beam pattern sidelobe gain of the main lobe gain is not less than the set threshold, and further, the main lobe beam pattern sidelobe gain is the ratio of the largest side the ratio of the main lobe gain lobe gain.

[0012] 所述计算各用户的波束权值的过程中包括:将配对的用户组内除该用户以外其他用户的方向角作为干扰角。 [0012] The beam weights calculated during each user comprising: an angle other users as interference direction angle other than the user in the user group will be paired.

[0013] 所述计算各用户的波束权值之后,进一步包括:将用户的数据流与用户对应的波束权值相乘,并加载用户专用导频后通过天线进行发送;或者,对配对的用户组内各用户的波束权值进行正交处理,得到每个用户的正交波束权值,将用户的数据流与用户对应的正交波束权值相乘,并加载用户专用导频后通过天线进行发送。 After [0013] the calculation of beam weights for each user, further comprising: a user data stream corresponding to the user is multiplied by the beam weights, and the user loads the transmission via the antenna dedicated pilot; or paired user after the beam weights for each user in the group treated orthogonal, orthogonal beams to obtain weights for each user, the data stream is multiplied by the user corresponding to the user's weight orthogonal beams, and loads the user dedicated pilot through an antenna sending.

[0014] 该方法进一步包括:不反馈预编码矩阵指示PMI信息,空余的PMI信息位用于信道质量指示CQI和/或分类指示RI的反馈。 [0014] The method further comprising: indicating no feedback precoding matrix information PMI, PMI information of the spare bits for CQI channel quality indication and / or indication RI classification feedback.

[0015] 该方法进一步包括:基于SRS和CQI反馈,对反馈的CQI进行估计和补偿;和/或, 基于SRS和公共导频的CQI反馈计算RI。 [0015] The method further comprising: based on the SRS and CQI feedback on the estimated CQI feedback and compensation; and / or, a common pilot based on the SRS and CQI feedback calculation RI.

[0016] 一种多用户波束成形装置,适用于基于TDD的MIMO无线通信系统,该装置包括:下行信道单元、DOA单元、配对单元、计算单元和处理单元,其中,所述下行信道单元用于根据上行信道信息获得每个用户的下行信道信息;所述DOA单元用于采用DOA估计算法,根据下行信道信息获得每个用户的DOA信息;所述配对单元用于对用户进行配对,满足设定的约束条件的用户组成配对的用户组;所述计算单元用于采用零陷展宽算法,根据配对的用户组内每个用户的DOA信息计算各用户的波束权值,每个用户的波束权值所对应的波束具有如下性质,在对应用户自己的DOA方向形成主瓣,在配对的用户组内其他用户的DOA方向生成宽零陷。 [0016] A multi-user beamforming means suitable for the TDD MIMO based wireless communication system, the apparatus comprising: a downlink channel unit, the DOA unit, a pairing unit, calculation unit, and a processing unit, wherein the unit for the downlink channel the uplink channel information for each user obtaining downlink channel information; means for employing the DOA DOA estimation algorithm, DOA information obtained for each user according to downlink channel information; the pairing means for pairing the user, satisfies the set user constraints group consisting paired user; the computing means for employing nulling stretch algorithm to calculate beamforming weights based on DOA information of each user to each user in the user group is paired, the beam weights for each user the beam has a corresponding properties, is formed in the main lobe DOA corresponding to the user's own direction, generating a wide nulls in the other user groups paired DOA direction of the user.

[0017] 该装置进一步包括:处理单元,用于将用户的数据流与用户对应的波束权值相乘, 并加载用户专用导频后发送;或者,正交单元和处理单元,其中,所述正交单元用于对配对的用户组内各用户的波束权值进行正交处理,得到每个用户的正交波束权值;所述处理单元用于将用户的数据流与用户对应的正交波束权值相乘,并加载用户专用导频后发送。 [0017] The apparatus further comprises: a processing unit, a data flow corresponding to the user for multiplying the beam weights, and load transmitting user dedicated pilot; or orthogonal unit and a processing unit, wherein said means for orthogonal beam weights for each user in the user group is paired quadrature processing to obtain orthogonal beam weights for each user; orthogonal to said processing unit for a data flow corresponding to the user multiplied by the beam weights, and loads the user-specific pilot transmission.

[0018] 该装置进一步包括:CQI补偿单元,用于基于SRS和公共导频的CQI反馈,对反馈的CQI进行估计和补偿;和/或,RI确定单元,基于SRS和公共导频的CQI反馈计算RI。 [0018] The apparatus further comprises: a compensation unit CQI, SRS based on the common pilot and CQI feedback, the feedback of the CQI estimation and compensation; and / or, the RI determination unit, a feedback based on the SRS and CQI common pilots calculation of RI.

[0019] 本发明方案中,在基于TDD的MIMO无线通信系统中,根据上行信道信息获得每个用户的下行信道信息,采用波达方向DOA估计算法,根据所述下行信道信息获得每个用户的DOA信息,并且,对用户进行配对,满足设定的约束条件的用户组成配对的用户组,采用零陷展宽算法,根据配对的用户组内每个用户的DOA信息计算各用户的波束权值,每个用户的波束权值所对应的波束具有如下性质,在对应用户自己的DOA方向形成主瓣,在配对的用户组内其他用户的DOA方向生成宽零陷,在不使用编码的情况下,仅仅利用多天线技术,利用波束零陷展宽技术,可以使得至少2个用户利用相同的时、频、码资源,实现了对系统资源的有效复用。 [0019] The embodiment of the present invention, in the TDD MIMO-based wireless communication system, uplink channel information is obtained according to each user's downlink channel information using DOA DOA estimation algorithm, each user is obtained according to the downlink channel information DOA information, and the pairing of the user, the user satisfies the constraints set consisting of paired user group, broadening using nulling algorithm to calculate beamforming weights based on DOA information of each user to each user in the user group pair, a beam weight for each beam corresponding to the user having the following properties is formed in the main lobe direction DOA their corresponding user, generating a wide nulls in the other user groups paired DOA direction of the user, without the use of coding, using only the multi-antenna technology, the use of beam broadening nulls art, may be such that at least two users using the same time, frequency, code resources, system resources to achieve the effective reuse. 进一步地还通过波束权值正交化技术,有效降低用户间干扰。 Further, through the beam weights orthogonalization techniques, reduce inter-user interference.

[0020] 另外,本发明方案中对于反馈信令的实现方案细节问题给予了定义,进行了完善。 [0020] Further, in the embodiment of the present invention for the implementation details of the definition given feedback signaling, was perfect.

附图说明 BRIEF DESCRIPTION

[0021] 图1为本发明TDD无线通信系统中基于零陷展宽的多用户波束成形及赋形的发射机原理示意图; [0021] Figure 1 is a schematic view of the principle of the invention based on the broadening nulls, multi-user beamforming transmitter and shaping TDD radio communication system;

[0022] 图2为本发明TDD无线通信系统中基于零陷展宽的多用户波束成形及赋形流程图; [0022] FIG 2 is a flowchart of the invention forming and shaping TDD-based wireless communication system broadening nulls multiuser beam;

[0023] 图3为本发明TDD无线通信系统中基于零陷展宽的多用户波束成形及赋形装置结构示意图。 [0023] Figure 3 is a schematic view of the invention forming and shaping apparatus broadening nulls based multi-user-beam TDD radio communication system.

具体实施方式 Detailed ways

[0024] 结合图1和图2,TDD无线通信系统中基于零陷展宽的多用户波束成形的具体处理过程包括以下步骤: [0024] FIG. 1 and FIG. 2, the specific process TDD-based wireless communication system nulls stretched multi-user beamforming comprising the steps of:

[0025] 步骤201 :根据上行信道信息获得每个用户的下行信道信息。 [0025] Step 201: the channel information is obtained according to uplink channel information for each user's downlink.

[0026] 通过对上行检测参考信号(SRS,Sounding Reference Signal)的估计获得上行信道信息;对应TDD方式,可以利用上行信道与下行信道的互易性,根据上行信道信息获得下行信道信息。 [0026] to obtain uplink channel information by estimating the uplink detection reference signal (SRS, Sounding Reference Signal); corresponds to TDD manner, the reciprocity of the uplink channel and downlink channel, obtain the downlink channel information from uplink channel information. 下行信道信息可以通过下行信道矩阵的方式来表示。 Downlink channel information may be represented by means of a downlink channel matrix.

[0027] 步骤202 :采用波达方向(DOA,Direction of Arrival)估计算法,根据下行信道信息获得每个用户的DOA信息。 [0027] Step 202: The direction of arrival (DOA, Direction of Arrival) estimation algorithm, DOA information obtained for each user according to downlink channel information.

[0028] 步骤203 :对用户进行配对,满足设定的约束条件的用户组成配对的用户组。 [0028] Step 203: the user pairing constraints to meet the user setting the user group composed of paired.

[0029] 所述约束条件可以为用户之间的DOA角之差不小于设定值。 [0029] The constraint condition may be set to a value not less than the difference between the DOA angles user. 不同用户之间的DOA 角之差Δ φ是零陷展宽算法中的重要参数,该参数表示零陷展宽算法所设置的零陷应该达到的宽度,在8Τχ天线时,可以设置约束条件为Δ φ > 10° ;在4Τχ天线时,可以设置约束条件为Δ φ > 20°。 Difference DOA angles between different users Δ φ is an important parameter nulling widening algorithm, the parameter indicates the width of the nulls nulling broadening algorithm provided should be achieved when 8Τχ antenna, may be set constraints to Δ φ > 10 °; at 4Τχ antenna, may be provided as a constraint Δ φ> 20 °. 对用户进行配对时,由DOA角之差达到设定值或设定值以上的用户组成配对的用户组。 When the user pair, the DOA angles more than the difference between the value of the user setting or user group composed of paired.

[0030] 所述约束条件也可以为用户的波束图峰均比不小于设定的峰均比门限。 [0030] The constraint condition may be set not less than the peak to average ratio threshold peak beam pattern for the user. 所述波束图峰均比是波束图主瓣的增益与波束图增益均值的比值。 The beam pattern is a peak-beam main lobe beam pattern gain and average gain ratio. 对于一个确定用户而言,波束图主瓣的增益及波束图增益均值是已经设置好的。 For a certain user, the beam main lobe beam pattern gain and average gain is already set. 设置这样的约束条件,能够确保如果用户的主瓣的增益不是足够大的话,将不能成为配对的用户组中的用户,从而不能进行后续的多用户的零陷展宽算法。 Providing such constraints can be ensured if the gain of the main lobe of the user is not large enough, it will not be paired user of the user group, and thus can not perform subsequent development multiuser nulling algorithm width. 所述峰均比门限的选取可以通过仿真来确定。 The PAPR threshold selected may be determined by simulation.

[0031] 所述约束条件还可以为用户的波束图旁瓣主瓣增益比不小于设定的增益门限。 [0031] The user may also be constraints beam pattern sidelobe gain of the main lobe gain is not less than the set threshold. 所述波束图旁瓣主瓣增益比是最大旁瓣的增益与主瓣增益的比值。 The beam pattern sidelobe gain than the main lobe is the largest sidelobe gain and the gain of the main lobe ratio. 对于一个确定用户而言, 最大旁瓣的增益和主瓣增益是已经设置好的。 For a certain user, the biggest gain and side lobe main lobe gain is already set. 设置这样的约束条件,能够保证旁瓣的增益过大的用户将不能成为配对的用户组中的用户,从而不能进行后续的多用户的零陷展宽算法。 Providing such constraints, to ensure that the side lobe gain is too large users will not be paired user of the user group, and thus can not perform subsequent multi-user broadening nulling algorithm. 最大旁瓣的增益和主瓣增益的确定可以为:找到除主瓣外增益最大的方向、即主瓣边零陷以外的方向,估计得到该方向的波束增益值P2,并且估计得到主瓣波束增益值P1,这样, 约束条件为=P2A31 <增益门限。 Determining the gain and the main lobe gain of the maximum sidelobe may be: found outside the main lobe maximum gain direction other, i.e. a direction other than the nulling main lobe side, the estimated the direction beam gain value P2, and the estimated main lobe beam gain values ​​P1, so that, for the constraint = P2A31 <threshold gain. 增益门限值可以通过仿真确定,如增益门限取-5dB。 Gain threshold can be determined by simulation, such as gain threshold take -5dB. [0032] 步骤202和步骤203没有明显的执行顺序,既可以同时执行;也可以先执行步骤202,后执行步骤203 ;还可以先执行步骤203,后执行步骤202. [0032] Step 202 and step 203 is no obvious order of execution may be performed simultaneously; may be performed before step 202, after performing step 203; step 203 may also be performed before, after step 202 is performed.

[0033] 步骤204:采用零陷展宽算法,根据配对的用户组内每个用户的DOA信息计算各用户的波束权值。 [0033] Step 204: The broadening nulling algorithm to calculate beamforming weights based on DOA information of each user to each user in the user group pairing. 每个用户的波束权值所对应的波束具有如下性质:在对应用户自己的DOA 方向形成主瓣,在配对的用户组内其他用户的DOA方向生成宽零陷,以降低用户间干扰。 Beamforming weights corresponding to each user beam has the following properties: forming a main lobe in a direction corresponding to the user's own DOA, direction DOA of other users in generating a wide nulls paired user group, to reduce interference between users. 计算一个用户的波束权值的过程中:将配对的用户组内除该用户以外其他用户的方向角作为干扰角。 Computing a user in the process of beam weights: The paired user group, among other angle other than the direction of the user as user interference angle. 采用零陷展宽算法的具体计算过程如下。 Stretch nulling algorithm using specific calculation is as follows.

[0034] 线性约束最小方差(LCMV)准则是指在某个线性约束条件下,使阵列输出的方差最小。 [0034] linearly constrained minimum variance (the LCMV) criterion refers to a linear constraints at the output of the minimum variance array. 下面采用零陷展宽算法计算得到能够使阵列输出的方差最小的Rxx。 Broadening nulling algorithm enables to obtain the array output using the minimum variance Rxx below.

[0035] 设干扰角的入射角度为θ工,在数据失配的情况下,角度的最大变化量为Δ θ,按两点分布考虑,入射角左边扰动P Δ θ,右边的扰动为qA θ,且p+q= 1。 [0035] incident angle [theta] angle is provided interference workers, in the case where the data mismatch, the maximum amount of change of angle Δ θ, distributed by two considerations, the incident left perturbation P Δ θ, the disturbance is the right qA θ and p + q = 1. 由于干扰功率的 Due to interference power

大小只影响零陷的深度,可假设两个干扰的功率相等。 Affects only the size of the depth of nulls, it may be assumed equal to two interference power. 这样,两个干扰形成的导向矢量为: Thus, the guide is formed by interfering two vectors:

[0036] [0036]

<formula>formula see original document page 7</formula> (1) <Formula> formula see original document page 7 </ formula> (1)

[0037] [0037]

<formula>formula see original document page 7</formula> (2) <Formula> formula see original document page 7 </ formula> (2)

[0038] 式(1)、式(2)中,钓二;^虹㈦+;? In [0038] formula (1), the formula (2), two catch; ^ + vii Hong ;? 厶的观二;^^! Si Concept II; ^^! ⑷-^^^如果Δ θ很小,则有: ⑷ - ^^^ If Δ θ is small, then:

[0039] [0039]

φλ= π sin(0, + ρΑΘ) « (sin θχ + (3) φλ = π sin (0, + ρΑΘ) «(sin θχ + (3)

[0040] [0040]

φ=1 π Sini^1 -qA0) « ^(sin θλ -qA0 cos θχ) (4) φ = 1 π Sini ^ 1 -qA0) «^ (sin θλ -qA0 cos θχ) (4)

[0041] 将式(3)代入式(1)、式(4)代入式(2),可以看到,对于固定的入射角, Cose1I彡1。 [0041] The formula (3) into equation (1), the formula (4) into equation (2) can be seen, for a fixed angle of incidence, Cose1I San 1. 考虑最大的角度扩散,取Icose1I = 1,并设Δ炉《Δ0。 Considering the maximum diffusion angle, taking Icose1I = 1, and let Δ furnace "Δ0. 这样,式(1)、式(2) Thus, the formula (1), the formula (2)

可以变化为: It can change:

[0042] [0042]

α(θλ + ρΑΘ) = [1,exp(如)εχρΟ^Δ^),···,exp(y(M-\)φ)exp(j'(M- 1)ρΑφ)ΐ 二Βα(θ、) (5) α (θλ + ρΑΘ) = [1, exp (eg) εχρΟ ^ Δ ^), ···, exp (y (M - \) φ) exp (j '(M- 1) ρΑφ) ΐ two Βα (θ ,) (5)

[0043] [0043]

α{θχ -ςΑΘ) = [1,exp(伸)QX^-jgAp),exp()(M - 1)灼exp(-y(M — ^Αφ)]1' = Chα{θχ) (6) α {θχ -ςΑΘ) = [1, exp (elongation) QX ^ -jgAp), exp () (M - 1) burning exp (-y (M - ^ Αφ)] 1 '= Chα {θχ) (6)

[0044] 式(5)、式(6)中炉=πSil^,并且有: [0044] Formula (5), the formula (6) furnace = πSil ^, and has:

[0045] [0045]

B = diag {1, expOA 屮),■··, exp(y(M - \)ρ/^φ)} (7) B = diag {1, expOA Cao), ■ ··, exp (y (M - \) ρ / ^ φ)} (7)

[0046] [0046]

C = diag {1' exp(为Δρ),…,exp(y(M — \)q^)} (8) C = diag {1 'exp (as Δρ), ..., exp (y (M - \) q ^)} (8)

[0047] 这样,接收的信号可以表示式为: [0047] Thus, the received signal can be represented by the formula:

[0048] X+ (t) = BAS (t) +Bn (t) (9) [0048] X + (t) = BAS (t) + Bn (t) (9)

[0049] X_ (t) = ChAS (t) +CHn (t) (10) [0049] X_ (t) = ChAS (t) + CHn (t) (10)

[0050] 其中,X+(t)表示从θ 1+ΡΔ θ入射的干扰,而X_(t)表示从θ fqA θ入射的干扰。 [0050] wherein, X + (t) shows the entrance from θ 1 + ΡΔ θ interference, X_ (t) represented by θ fqA θ incident from the interference. 分别取两个信号形成的协方差矩阵,由于BBH = I、CCH = I,所以有:[0051 ] R+ = E[X+ (t)X^ (0] = BAPAhBh +σΊ (11) Were taken two signal forming the covariance matrix, since BBH = I, CCH = I, it is: [0051] R + = E [X + (t) X ^ (0] = BAPAhBh + σΊ (11)

[0052] R- =E[X_(t)X"(t)] = CHAPA"C + a2I (12) [0052] R- = E [X_ (t) X "(t)] = CHAPA" C + a2I (12)

[0053] 由于式(11)、式(12)是在信号分成两部分的基础上得到的协方差矩阵,因此在计算的时候需要将两个矩阵进行算术平均,这样,得到的协方差矩阵为: [0053] Since the formula (11), (12) the covariance matrix is ​​divided into two parts on the basis of the signal obtained, thus needs to be calculated when the arithmetic mean of two matrices, so that the covariance matrix is ​​obtained :

[0054] R = ^(R+ +R-) = ^(BAPAhBh + Ch APAfl C) +σ21 (13) [0054] R = ^ (R + + R-) = ^ (BAPAhBh + Ch APAfl C) + σ21 (13)

[0055] 通过式(13)可以看出,由于矩阵B和C中没有包括入射角信息,因此最终得到的协方差矩阵为接收信号协方差矩阵的算术运算。 [0055] As can be seen by the formula (13), the arithmetic operation since the matrix B, and C does not include the angle of incidence information, thus resulting covariance matrix of the received signal covariance matrix. 扰动Δ θ的概率为ρ,-Δ θ的概率则为1-Ρ,因此,扰动的均值为: The probability of perturbation Δ θ [rho], compared with the probability -Δ θ 1-Ρ, therefore, mean disturbance of:

[0056] m = (2ρ-1) Δ θ (14) [0056] m = (2ρ-1) Δ θ (14)

[0057] 均值的不同代表扰动中心位置的不同,显然ρ = 0. 5时扰动中心在入射角的方向。 Different [0057] Different representative of the mean position of the center of the disturbance, apparently ρ = 0.5 perturbations direction of the center of the incident angle. 扰动的方差Σ 2为: Disturbance variance Σ 2 is:

[0058] Σ 2 = 4Δ θ 2ρ(1-ρ) (15) [0058] Σ 2 = 4Δ θ 2ρ (1-ρ) (15)

[0059] 作为扰动与中心角偏差的一种度量,方差Σ 2越大,则表示对扰动的影响越大,当ρ =0. 5时达到最大。 [0059] As a measure of the disturbance and the angular deviation of the center, the greater the variance Σ 2, then the greater the influence of the disturbance, when ρ = 0. 5 reaches the maximum. 由于是对扰动的影响,因此Σ 2表示对扰动的抑制,从而影响接收信号的信干噪比。 Since the impact of disturbances, thus suppressing disturbance expressed Σ 2, thus affecting the received signal SINR.

[0060] 观察式(7)和式(8)可知,当ρ = 0. 5时,B = C。 [0060] (7) and (8) observation equation, when when ρ = 0. 5, B = C. 设左中的元素片(1彡i,j彡Μ), 由于B和C均为以指数函数为特征值的对角矩阵。 Sheet element disposed in the left (1 San i, j San Μ), since the B and C are exponentially as the diagonal matrix of eigenvalues. 那么,对于其中的元素经过5左万"的运算以后为: Well, for one of the elements through the left after 5 Wan, "the operation is:

[0061] [0061]

PljQxpdi-βΑφ/2) (16) PljQxpdi-βΑφ / 2) (16)

[0062] 而经过Ci^C运算以后的元素为: [0062] After the subsequent Ci ^ C arithmetic elements:

[0063] [0063]

exp((y-0A^/2) (17) exp ((y-0A ^ / 2) (17)

[0064] 经过式(13)的运算可以将矩阵的对应元素做平均,这样矩阵R中的对应元素为: [0064] After calculation of formula (13) may be the corresponding element of the matrix to make the average, so that the corresponding element of matrix R is:

[0065] [0065]

〜=全尽cos((i-/)A 炉/2) (18) = Make ~ Full cos ((i - /) A furnace / 2) (18)

[0066] 从式(18)可以看到,经过式(13)的运算后,得到的矩阵为接收信号协方差矩阵对应元素的运算,定义矩阵T,其中的元素为: [0066] can be seen from the formula (18), after the calculation of formula (13), the resulting matrix corresponding to the received signal covariance matrix calculation elements, define the matrix T, where the elements:

[0067] [0067]

^=cos((/-y)A^/2) (19) ^ = Cos ((/ - y) A ^ / 2) (19)

[0068] 并对矩阵力做如式(20)的运算: [0068] and the force to do matrix formula (20) is performed:

[0069] [0069]

R = k°T (20) R = k ° T (20)

[0070] 其中ο为Hadamard积。 [0070] where ο is the Hadamard product. 经过这样运算得到的矩阵和经过式(13)得到的矩阵一样,但却可以减少运算量。 After the matrix (13) and a matrix obtained through the calculation formula obtained as such, but it can reduce the amount of computation. [0071] 将得到的R代入线性约束最小方差公式访=^5(仏)(氏(仏)]_1 g中,即将 [0071] The obtained substituting R into Equation access LCMV ^ 5 = (Fo) (s (Fo)] _ 1 g of, i.e.

R作为Rxx,得到配对的用户组内每个用户的波束权值,从而完成波束形成算法。 As Rxx R, to give the beam weights for each user in the user group is paired, thereby completing the beamforming algorithm.

[0072] 步骤205 :将用户的数据流与用户对应的波束权值相乘,并加载用户专用导频(UE-specific reference signals)后通过天线进行发送,完成下行波束的赋形。 [0072] Step 205: the user data stream corresponding to the user is multiplied by the beam weights, and after loading the user-specific pilot transmission (UE-specific reference signals) through an antenna, downlink beam-forming is completed.

[0073] 进一步地,在步骤204和步骤205之间还可以包括:对配对的用户组内各用户的波束权值进行正交处理,得到每个用户的正交波束权值。 [0073] Furthermore, between step 204 and step 205 may further comprise: a beam weights for each user in the user group is paired quadrature processing to obtain orthogonal beam weights for each user. 此时,步骤205中采用正交波束权值与用户的数据流相乘。 In this case, in step 205 the data stream is multiplied by orthogonal beams using the weight of the user. 对各用户的波束权值进行的正交处理可以通过Gram-Schmidt正交化算法来实现。 A beam orthogonal to the weight of each process performed by the user can be achieved by Gram-Schmidt orthogonalization algorithm. 将用户的数据流与用户对应的加权波束权值相乘,并加载用户专用导频后发送,能够更进一步地降低用户间干扰。 The user data stream corresponding to the user is multiplied by a weighting beam weights, and loads the user-specific pilot transmission, it is possible to further reduce inter-user interference.

[0074] 以上各处理步骤均在eNodeB中完成。 [0074] the above processing steps are completed in the eNodeB.

[0075] 另外,结合TDD无线通信系统中基于零陷展宽的多用户波束成形及赋形方案,本发明还提供了反馈信令的实现方案。 [0075] Further, in conjunction with a TDD radio communication system based on broadening nulls, multi-user beamforming and shaping embodiment, the present invention also provides a feedback signaling implementations.

[0076] TDD模式下,不需要反馈预编码矩阵指示(PMI,Precoding MatrixIndication)信息,空余的PMI信息位可以用于其它信息的反馈,例如信道质量指示(CQI,Channel Quality Indication)、分类指不(RI, Rank Indication)。 [0076] TDD mode, no feedback precoding matrix indicator (PMI, Precoding MatrixIndication) information, spare bits of the PMI information may be used for other feedback information, such as channel quality indicator (CQI, Channel Quality Indication), classification means not (RI, Rank Indication).

[0077] 用户之间的干扰受到配对情况和所使用的预编码矢量的影响很大,上行信道信息是利用SRS进行获取的,基本的信道情况、如下行信道的好坏由公共导频的CQI反馈来获得。 [0077] The interference between users is greatly affected pairing and precoding vector to be used, uplink channel information using SRS are acquired, the basic channel, the following downlink channel quality of frequency by a common guide CQI to get feedback. 对于CQI估计方法,可以联合基于SRS和CQI反馈,由eNodeB对反馈的CQI进行估计和补偿,得到更合适的CQI。 For CQI estimation method, it can be combined based on the SRS and CQI feedback on the CQI feedback from the estimate and compensate an eNodeB, to obtain more appropriate CQI. 对于Rank估计方法,由于CQI的估计使用了SRS来获取上行信道信息,因此,可以由eNodeB自身基于SRS和公共导频的CQI反馈来计算RI,这样就减少了上行RI的反馈。 Rank for estimation method, since the estimated CQI using the SRS to obtain uplink channel information, and therefore, by the eNodeB itself may be a common pilot based on the SRS and CQI feedback to calculate RI, thus reducing the uplink feedback of RI.

[0078] 在TDD模式下,不需要使用公共导频(CRS,Common Reference Signal),需要使用每个用户的专用导频。 [0078] In the TDD mode, without the use of a common pilot (CRS, Common Reference Signal), requires the use of each user dedicated pilot frequency.

[0079] 图3为本发明TDD无线通信系统中基于零陷展宽的多用户波束成形及赋形装置结构示意图,如图3所示,该装置包括:下行信道单元、DOA单元、配对单元、计算单元和处理单元,其中,下行信道单元用于根据上行信道信息获得每个用户的下行信道信息,并提供给DOA单元;DOA单元用于采用DOA估计算法,根据下行信道信息获得每个用户的DOA信息,并提供给计算单元;配对单元用于对用户进行配对,满足设定的约束条件的用户组成配对的用户组,并将得到的配对的用户组提供给计算单元;计算单元用于采用零陷展宽算法,根据配对的用户组内每个用户的DOA信息计算各用户的波束权值,并提供给处理单元;处理单元用于将用户的数据流与用户对应的波束权值相乘,并加载用户专用导频后发送。 [0079] FIG. 3 based on the present disclosure broadening nulls, multi-user beamforming schematic view of a forming device and a TDD radio communication system, shown in Figure 3, the apparatus comprising: a downlink channel unit, the DOA unit, a pairing unit calculates unit and a processing unit, wherein the downlink channel unit for obtaining according to the uplink channel information of each user's downlink channel information and provided to the DOA unit; DOA estimation algorithm DOA means for employing, obtained for each user DOA according to the downlink channel information information, and to the calculation unit; a user pairing unit for pairing the user, it satisfies the constraint condition setting composition paired user group, and user group provided to the pairing calculating unit obtained; means for calculating zero - broadening algorithm trap, is calculated according to the DOA information of each user in the user group for each pair of beam weights to the user, and supplied to the processing unit; a processing unit for multiplying a user data stream corresponding to the user beam weights, and loading the user-specific pilot transmission. 计算单元中得到的每个用户的波束权值所对应的波束具有如下性质:在对应用户自己的DOA方向形成主瓣,在配对的用户组内其他用户的DOA方向生成宽零陷。 Beam calculation unit weight obtained for each user corresponding to the beam having the following properties: forming a main lobe in a direction corresponding to the user's own DOA, DOA direction other users generating a wide nulls in the user group pairing.

[0080] 该装置进一步包括:正交单元,用于对配对的用户组内各用户的波束权值进行正交处理,得到每个用户的正交波束权值;所述处理单元采用正交波束权值与用户的数据流相乘。 [0080] The apparatus further comprises: an orthogonal unit, the beam weights for each user in the user group is paired quadrature processing to obtain orthogonal beam weights for each user; and the processing unit uses orthogonal beams weight multiplied by the user data stream.

[0081] 该装置还进一步包括:CQI补偿单元,用于基于SRS和公共导频的CQI反馈,对反馈的CQI进行估计和补偿;和/或,RI确定单元,基于SRS和公共导频的CQI反馈计算RI。 [0081] The apparatus further comprises: a compensation unit CQI, SRS based on the common pilot and CQI feedback, the feedback of the CQI estimation and compensation; and / or, the RI determination unit, based on the SRS and CQI common pilots feedback calculation RI.

[0082] 以上所述,仅为本发明的较佳实施例而已,并非用于限定本发明的保护范围。 [0082] The above are only preferred embodiments of the present invention but are not intended to limit the scope of the present invention.

Claims (10)

  1. 一种多用户波束成形方法,适用于基于时分双工TDD的多输入多输出MIMO无线通信系统,其特征在于,该方法包含:根据上行信道信息获得每个用户的下行信道信息;采用波达方向DOA估计算法,根据所述下行信道信息获得每个用户的DOA信息,并且,对用户进行配对,满足设定的约束条件的用户组成配对的用户组;采用零陷展宽算法,根据配对的用户组内每个用户的DOA信息计算各用户的波束权值,每个用户的波束权值所对应的波束具有如下性质,在对应用户自己的DOA方向形成主瓣,在配对的用户组内其他用户的DOA方向生成宽零陷。 A multi-user beamforming method for multiple input multiple output MIMO-based wireless communication system is a time division duplexing TDD, characterized in that, the method comprising: obtaining information based on the uplink channel of each user's downlink channel information; using DOA user DOA estimation algorithm, DOA information obtained for each user according to the downlink channel information, and the pairing of the user, satisfies the constraint condition setting group consisting of paired users; stretch using nulling algorithm, the pairing of the user group DOA information of each user within a beam weight is calculated for each user, each user beam weight corresponding to a beam having the following properties, are formed in the main lobe direction DOA their corresponding user, the other users in the user group is paired DOA direction of generating a wide nulls.
  2. 2.根据权利要求1所述的方法,其特征在于,所述根据上行信道信息获得每个用户的下行信道信息,包括:通过对上行检测参考信号SRS的估计获得上行信道信息;利用上行信道与下行信道的互易性,根据上行信道信息获得下行信道信息。 2. The method according to claim 1, characterized in that the obtaining of each user's downlink channel information from uplink channel information, comprising: obtaining an uplink channel information by estimating the uplink detection reference signal SRS; the use of an uplink channel and reciprocity of the downlink channel, the downlink channel information is obtained according to uplink channel information.
  3. 3.根据权利要求1所述的方法,其特征在于,所述约束条件为:用户之间的DOA角之差不小于设定值,进一步地,STx天线时,所述约束条件为Δφ > 10°,4Τχ天线时,所述约束条件为Δ φ > 20°,其中,Δ φ为用户之间的DOA角之差;或者,用户的波束图峰均比不小于设定的峰均比门限,进一步地,所述波束图峰均比是波束图主瓣的增益与波束图增益均值的比值;或者,用户的波束图旁瓣主瓣增益比不小于设定的增益门限,进一步地,所述波束图旁瓣主瓣增益比是最大旁瓣的增益与主瓣增益的比值。 3. The method according to claim 1, wherein the constraint condition is: the difference between the user DOA angles is not less than the set value, further, when STx antenna, the constraint is Δφ> 10 °, when 4Τχ antenna, the constraint condition is Δ φ> 20 °, wherein, Δ φ is the difference between the DOA angles user; alternatively, the user's beam pattern PAR PAR is not less than the set threshold, further, the beam pattern is a peak-beam main lobe beam pattern gain and average gain ratio; or, the user's main lobe beam pattern sidelobe gain is set not less than the threshold gain, further, the FIG beam sidelobe gain than the main lobe is the largest sidelobe gain and the gain of the main lobe ratio.
  4. 4.根据权利要求1所述的方法,其特征在于,所述计算各用户的波束权值的过程中包括:将配对的用户组内除该用户以外其他用户的方向角作为干扰角。 4. The method according to claim 1, wherein said beam weight calculation value of each user comprises: the angular direction other than the user of the other users in the user group as an interference paired angles.
  5. 5.根据权利要求1至4任一所述的方法,其特征在于,所述计算各用户的波束权值之后,进一步包括:将用户的数据流与用户对应的波束权值相乘,并加载用户专用导频后通过天线进行发送;或者,对配对的用户组内各用户的波束权值进行正交处理,得到每个用户的正交波束权值, 将用户的数据流与用户对应的正交波束权值相乘,并加载用户专用导频后通过天线进行发送。 The method according to any one of claim 1 to claim 4, wherein the weight of each beam is calculated after the user, further comprising: multiplying the user corresponding to the user data stream beamforming weights and loads after a user dedicated pilot frequency transmitted by the antenna; Alternatively, the beam weights for each user in the user group is paired quadrature processing to obtain orthogonal beam weights for each user, the user data stream corresponding to the user positive cross beam weights are multiplied, and the user loads the transmission via the antenna specific pilots.
  6. 6.根据权利要求1至4任一所述的方法,其特征在于,该方法进一步包括:不反馈预编码矩阵指示PMI信息,空余的PMI信息位用于信道质量指示CQI和/或分类指示RI的反馈。 6. The method according to any one of claims 1 to 4, characterized in that, the method further comprising: indicating no feedback precoding matrix information PMI, PMI information of the spare bits for CQI channel quality indication and / or classification indicating RI feedback of.
  7. 7.根据权利要求1至4任一所述的方法,其特征在于,该方法进一步包括:基于SRS和CQI反馈,对反馈的CQI进行估计和补偿;和/或,基于SRS和公共导频的CQI反馈计算RI。 7. The method according to any one of claims 1 to 4, characterized in that, the method further comprising: based on the SRS and CQI feedback, the feedback of the CQI estimation and compensation; and / or, based on the SRS and the common pilot CQI feedback calculation RI.
  8. 8.一种多用户波束成形装置,适用于基于TDD的MIMO无线通信系统,其特征在于,该装置包括:下行信道单元、DOA单元、配对单元、计算单元和处理单元,其中,所述下行信道单元用于根据上行信道信息获得每个用户的下行信道信息;所述DOA单元用于采用DOA估计算法,根据下行信道信息获得每个用户的DOA信息;所述配对单元用于对用户进行配对,满足设定的约束条件的用户组成配对的用户组;所述计算单元用于采用零陷展宽算法,根据配对的用户组内每个用户的DOA信息计算各用户的波束权值,每个用户的波束权值所对应的波束具有如下性质,在对应用户自己的DOA方向形成主瓣,在配对的用户组内其他用户的DOA方向生成宽零陷。 A multi-user beamforming means suitable for the TDD MIMO based wireless communication system, wherein, the apparatus comprising: a downlink channel unit, the DOA unit, a pairing unit, calculation unit, and a processing unit, wherein the downlink channel means for obtaining information according to the uplink channel of each user's downlink channel information; means for employing the DOA DOA estimation algorithm, DOA information obtained for each user according to downlink channel information; the pairing means for pairing a user, satisfy the constraints set by the user of the user group composed of paired; the computing means for employing nulling stretch algorithm to calculate beamforming weights based on DOA information of each user to each user in the user group is paired, each user beamforming weights corresponding to a beam having the following properties, are formed in the main lobe DOA corresponding to the user's own direction, the direction of other users DOA generating a wide nulls in the user group pairing.
  9. 9.根据权利要求8所述的装置,其特征在于,该装置进一步包括:处理单元,用于将用户的数据流与用户对应的波束权值相乘,并加载用户专用导频后发送;或者,正交单元和处理单元,其中,所述正交单元用于对配对的用户组内各用户的波束权值进行正交处理,得到每个用户的正交波束权值;所述处理单元用于将用户的数据流与用户对应的正交波束权值相乘,并加载用户专用导频后发送。 9. The apparatus according to claim 8, wherein the apparatus further comprises: a processing unit, a data flow corresponding to the user for multiplying the beam weights and loads the user-specific pilot transmission; or , orthogonal unit and a processing unit, wherein the means for orthogonal pairs of beam weights for each user in the user group is paired quadrature processing to obtain orthogonal beam weights for each user; with the processing unit in the user data stream corresponding to the user's weight is multiplied by orthogonal beams, and loads the user-specific pilot transmission.
  10. 10.根据权利要求8或9所述的装置,其特征在于,该装置进一步包括:CQI补偿单元,用于基于SRS和公共导频的CQI反馈,对反馈的CQI进行估计和补偿; 和/或,RI确定单元,基于SRS和公共导频的CQI反馈计算RI。 10. The apparatus of claim 8 or claim 9, wherein the apparatus further comprises: a compensation unit CQI, SRS based on the common pilot and CQI feedback on the estimated CQI feedback and compensation; and / or , RI determination unit, and a feedback calculation based on the SRS RI common pilot CQI.
CN 200910077635 2009-02-09 2009-02-09 Multi-user beam-forming method and device CN101800582A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 200910077635 CN101800582A (en) 2009-02-09 2009-02-09 Multi-user beam-forming method and device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN 200910077635 CN101800582A (en) 2009-02-09 2009-02-09 Multi-user beam-forming method and device
PCT/CN2009/075355 WO2010088828A1 (en) 2009-02-09 2009-12-07 Method and device for multi-user beamforming

Publications (1)

Publication Number Publication Date
CN101800582A true true CN101800582A (en) 2010-08-11

Family

ID=42541663

Family Applications (1)

Application Number Title Priority Date Filing Date
CN 200910077635 CN101800582A (en) 2009-02-09 2009-02-09 Multi-user beam-forming method and device

Country Status (2)

Country Link
CN (1) CN101800582A (en)
WO (1) WO2010088828A1 (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102149204A (en) * 2011-02-01 2011-08-10 华为技术有限公司 Method and system for scheduling channel resources and base station
WO2012058872A1 (en) * 2010-11-01 2012-05-10 中兴通讯股份有限公司 Downlink multi-path beamforming method and apparatus for single user in frequency division duplexing system
WO2012083683A1 (en) * 2010-12-20 2012-06-28 东南大学 Feedback method of mimo wireless communication system for downlink
WO2012088971A1 (en) * 2010-12-27 2012-07-05 中兴通讯股份有限公司 Method, device and base station for downlink beam-forming
WO2014107888A1 (en) * 2013-01-11 2014-07-17 华为技术有限公司 Transmission method and base station for downlink multiple-input multiple-output
CN104378146A (en) * 2013-08-16 2015-02-25 普天信息技术研究院有限公司 Method for pairing user equipment in uplink MU-MIMO system
CN105229934A (en) * 2013-06-28 2016-01-06 英特尔公司 Method for selecting at least one parameter for downlink data transmission with a mobile user equipment
CN105790815A (en) * 2014-12-23 2016-07-20 华为技术有限公司 Open loop multi-stream transmission method based on directional beam and base station
CN105940618A (en) * 2014-01-21 2016-09-14 高通股份有限公司 Pilot mapping for MU-MIMO
CN104185956B (en) * 2013-01-11 2017-04-12 华为技术有限公司 Downlink MIMO transmission method and a base station

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9794870B2 (en) 2013-06-28 2017-10-17 Intel Corporation User equipment and method for user equipment feedback of flow-to-rat mapping preferences
CN104181552B (en) * 2014-08-21 2017-07-25 武汉大学 Gnss receiver type of dynamic interference method normal trap widened zero
CN105204008B (en) * 2015-10-15 2017-10-03 哈尔滨工程大学 A zero-based method for forming a notch widening covariance matrix of an extended adaptive antenna beams

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7450673B2 (en) * 2006-08-10 2008-11-11 Cisco Technology, Inc. System and method for improving the robustness of spatial division multiple access via nulling
CN101340648B (en) * 2008-08-11 2012-01-11 中兴通讯股份有限公司 Generating method for multi-user beam shaping emission value
CN101425832B (en) * 2008-11-10 2012-09-26 中兴通讯股份有限公司 Adaptive multiuser wave beam forming method based on wide nulling

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012058872A1 (en) * 2010-11-01 2012-05-10 中兴通讯股份有限公司 Downlink multi-path beamforming method and apparatus for single user in frequency division duplexing system
WO2012083683A1 (en) * 2010-12-20 2012-06-28 东南大学 Feedback method of mimo wireless communication system for downlink
CN102571181B (en) * 2010-12-27 2014-11-05 中兴通讯股份有限公司 Method, device and base station for downlink beam forming
WO2012088971A1 (en) * 2010-12-27 2012-07-05 中兴通讯股份有限公司 Method, device and base station for downlink beam-forming
CN102571181A (en) * 2010-12-27 2012-07-11 中兴通讯股份有限公司 Method, device and base station for downlink beam forming
WO2012103812A1 (en) * 2011-02-01 2012-08-09 华为技术有限公司 Method and system for scheduling channel resources, and base station
CN102149204B (en) 2011-02-01 2013-10-02 华为技术有限公司 Method and system for scheduling channel resources and base station
CN102149204A (en) * 2011-02-01 2011-08-10 华为技术有限公司 Method and system for scheduling channel resources and base station
WO2014107888A1 (en) * 2013-01-11 2014-07-17 华为技术有限公司 Transmission method and base station for downlink multiple-input multiple-output
CN104185956A (en) * 2013-01-11 2014-12-03 华为技术有限公司 Transmission method and base station for downlink multiple-input multiple-output
CN104185956B (en) * 2013-01-11 2017-04-12 华为技术有限公司 Downlink MIMO transmission method and a base station
CN105229934A (en) * 2013-06-28 2016-01-06 英特尔公司 Method for selecting at least one parameter for downlink data transmission with a mobile user equipment
CN105229934B (en) * 2013-06-28 2018-10-16 英特尔公司 Selecting at least one parameter for the downlink data transmission with the mobile user equipment and a base station Method
CN104378146A (en) * 2013-08-16 2015-02-25 普天信息技术研究院有限公司 Method for pairing user equipment in uplink MU-MIMO system
CN105940618A (en) * 2014-01-21 2016-09-14 高通股份有限公司 Pilot mapping for MU-MIMO
CN105790815A (en) * 2014-12-23 2016-07-20 华为技术有限公司 Open loop multi-stream transmission method based on directional beam and base station

Also Published As

Publication number Publication date Type
WO2010088828A1 (en) 2010-08-12 application

Similar Documents

Publication Publication Date Title
Alkhateeb et al. Limited feedback hybrid precoding for multi-user millimeter wave systems
Adhikary et al. Joint spatial division and multiplexing—The large-scale array regime
US7884763B2 (en) Orthogonal/partial orthogonal beamforming weight generation for MIMO wireless communication
US20130230081A1 (en) Radio Base Station and Method Therein for Transforming a Data Transmission Signal
US20140177745A1 (en) Method and apparatus for antenna array channel feedback
US20140177683A1 (en) Method and apparatus for antenna array channel feedback
US6718184B1 (en) Method and system for adaptive signal processing for an antenna array
US20140177744A1 (en) Method and apparatus for antenna array channel feedback
US20130242773A1 (en) Node and method for generating beamformed for downlink communications
US20090080560A1 (en) Closed-loop beamforming weight estimation in frequency division duplex systems
US20110206154A1 (en) Wireless communications system and precoding method
US20140064109A1 (en) Method and apparatus for mitigating downlink interference
US8134503B2 (en) Open-loop beamforming MIMO communications in frequency division duplex systems
US20090252251A1 (en) Transform-domain feedback signaling for mimo communication
US20150078472A1 (en) Feedback Methodology for Per-User Elevation MIMO
Barriac et al. Space-time communication for OFDM with implicit channel feedback
US20140254517A1 (en) Method for multi-input multi-output communication in large-scale antenna system
US20130329772A1 (en) Data transmission in a multiple antenna system
US20130257655A1 (en) Beamforming method, apparatus for polarized antenna array and radio communication device and system thereof
US20130267266A1 (en) Method of communicating between base station and terminal based on interference alignment in multi-cell multi-user multiple-input multiple-output (mimo) interference channel and method and apparatus of communication using interference alignment and block successive interference pre-cancellation in multi-user multiple-input multiple-output interference channel
US20120281781A1 (en) Method and System for Transmitting Data Using Collaborative Multiple Input Multiple Output Beamforming
CN101425832A (en) Adaptive multiuser wave beam forming method based on wide nulling
Lee et al. Antenna grouping based feedback compression for FDD-based massive MIMO systems
WO2010006845A2 (en) Method of assigning precoding vectors in a mobile cellular network
US20160080052A1 (en) Method and apparatus for channel state information based on antenna mapping and subsampling

Legal Events

Date Code Title Description
C06 Publication
C10 Request of examination as to substance
C12 Rejection of an application for a patent