+

WO2007036139A1 - Pluralite de procedes de multiplexage de canaux d’antennes - Google Patents

Pluralite de procedes de multiplexage de canaux d’antennes Download PDF

Info

Publication number
WO2007036139A1
WO2007036139A1 PCT/CN2006/002415 CN2006002415W WO2007036139A1 WO 2007036139 A1 WO2007036139 A1 WO 2007036139A1 CN 2006002415 W CN2006002415 W CN 2006002415W WO 2007036139 A1 WO2007036139 A1 WO 2007036139A1
Authority
WO
WIPO (PCT)
Prior art keywords
antenna
user
channel
antenna group
matrix
Prior art date
Application number
PCT/CN2006/002415
Other languages
English (en)
Chinese (zh)
Inventor
Changguo Sun
Shiqiang Suo
Original Assignee
Shanghai Ultimate Power Communications Technology Co., Ltd.
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
Application filed by Shanghai Ultimate Power Communications Technology Co., Ltd. filed Critical Shanghai Ultimate Power Communications Technology Co., Ltd.
Publication of WO2007036139A1 publication Critical patent/WO2007036139A1/fr

Links

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
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0697—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using spatial multiplexing
    • 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
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
    • H04B7/0691—Hybrid systems, i.e. switching and simultaneous transmission using subgroups of transmit antennas

Definitions

  • the present invention relates to a channel multiplexing technique for multiple antennas, and in particular to a channel multiplexing method for an antenna. Background technique
  • a method of channel multiplexing using multiple antennas is classified into a spatial multiplexing method and a beamforming method.
  • the space division multiplexing technology of the MIMO (Multiple Input Multiple Output) system can be used as the hotspot area.
  • MIMO Multiple Input Multiple Output
  • Providing high-speed data services, using this technology can greatly increase the rate of data transmission, but also requires a higher signal-to-noise ratio.
  • MIMO spatial multiplexing technology transmits multiple parallel data streams through multiple antennas at the transmitting end. Since the channel is uncorrelated or related, the channels experienced by each data stream are independent of each other, so each can pass each The channel characteristics experienced by the data stream distinguish the data content contained in the different streams. MIMO spatial multiplexing technology effectively increases data transmission rate and frequency efficiency compared to single antenna systems by transmitting different data streams in parallel on the same time and frequency resources.
  • MIMO spatial multiplexing technology is used at this time, which will cause interference between the data streams.
  • beamforming technology can be adopted. Improve system anti-interference and anti-fading performance.
  • the so-called beamforming technology sends the same data stream through multiple antennas at the transmitting end.
  • the K user signals are respectively modulated onto the Ka antenna. For each user signal, there are different weights on different antennas, and the weighted signals are transmitted in a certain shape. As shown in Figure 1, it is assumed that the transmitting end transmits the same data stream to User 1, User 2, and User 3 through 9 antennas. Since the weights of the 9 antennas are different for different users, the receiving end is separated according to the weighting signal. Out different users. Different from the spatial multiplexing technology, the channel is required to have sufficient correlation, so that the data streams weighted by different antennas can form beams in the same direction, thereby providing anti-interference and fading capability.
  • the spatial multiplexing method cannot provide independent channels, so the channel cannot be multiplexed and transmitted.
  • the beamforming method cannot effectively suppress the channel interference between different users due to the small correlation of the channels. .
  • the technical problem to be solved by the present invention is to provide a method for multi-antenna channel multiplexing, which can adapt to changes in the channel environment and can be used when channel correlation is small and channel correlation is large.
  • the present invention provides a multi-antenna channel multiplexing method for a transceiver that uses one or more antenna units to communicate with a plurality of remote users, including the steps:
  • Each antenna group performs weighting processing on the transmitted data stream according to its corresponding weighting coefficient of each user, and then transmits.
  • the predetermined rule is that the number of antenna units included in each antenna group is greater than or equal to the number of groups of antenna groups.
  • the antenna elements in the antenna group are adjacently arranged.
  • Each antenna unit in each antenna group performs channel estimation on each of the users multiplexed with the channel by using the received data
  • the shaping weight coefficient is obtained according to the receiving power of the user corresponding to the antenna group and the receiving power of the user corresponding to the other antenna group.
  • the method further includes acquiring a spatial covariance matrix of each antenna group with respect to each user, and the covariance matrix is calculated according to the following formula: : where R ( "i ,” 2 ) is the spatial covariance matrix of the antenna group 77 7 to the user, and the dimension is
  • w ( n ) is the matrix of the shape weight coefficients of the user n, representing the conjugate transposed matrix, which is a unit matrix of dimensions (Miller, M Limit), and ⁇ is a scale factor.
  • ⁇ is a scale factor.
  • the present invention groups the antennas according to the number of users multiplexing the channels, and discloses a method for obtaining the shaping weight coefficients between the antenna elements of the antenna group, each The antenna group transmits parallel data to different users, spatial multiplexing between the antenna groups, and beamforming between the antenna elements of the antenna group.
  • each antenna unit performs beamforming to separate channels between different users, so that the parallel data transmitted by the antenna group can still distinguish different users, and is not limited to environmental changes; meanwhile, when the scatterers are rich
  • the independence between the antenna groups can be ensured, and the data can be transmitted by spatial multiplexing.
  • the present invention divides the adjacent antenna elements into one antenna group when grouping the antenna elements, the requirement that the space multiplexing between the antenna groups is greater than half a wavelength is ensured.
  • the present invention since the present invention includes a plurality of antenna elements in each antenna group, it is suitable for the expansion of the existing smart antenna system.
  • 1 is a relationship diagram between a beam forming technology antenna unit and a user in the prior art.
  • FIG. 2 is a flow chart of a method of channel multiplexing according to the present invention.
  • FIG. 3 is a diagram showing relationship between an antenna unit and a user in a beamforming technique in a specific embodiment; and FIG. 4 is an explanatory view of an antenna unit in a specific embodiment.
  • one MIMO channel can be viewed as multiple parallel subchannels, providing for the transmission of parallel data streams. If different data streams are transmitted on these parallel subchannels, it is called spatial multiplexing.
  • the spatial multiplexing technique divides the data stream into a plurality of sub-data streams, and simultaneously transmits the sub-data streams to different mobile stations through different antenna units. Therefore, the capacity of the MIMO channel is linearly increased with the number of subchannels. Multiple antennas are used simultaneously at the transmitter and receiver, and MIMO can greatly increase the capacity of the channel in a rich scatterer environment.
  • the core idea of the present invention is to group each antenna unit, each antenna group transmits a different data stream to a corresponding mobile station, and realizes spatial multiplexing of the antenna group; at the same time, each antenna unit of each antenna group transmits the same data stream. Beamforming.
  • the traditional beamforming technology is that all antenna units send the same data stream to different users, and different users are separated at the receiving end by different shaping coefficient of different users, in order to enable the antenna to use spatial multiplexing technology.
  • the beamforming method provided by the present invention firstly groups the antenna elements according to a predetermined rule, and adopts a specific process of beamforming of the antenna groups for each antenna group. It is well known that beamforming of a plurality of antenna elements requires obtaining a shaping weight coefficient.
  • the method for acquiring beamforming coefficients provided by the present invention firstly performs channel selection for each user multiplexed with each channel in each antenna group. Estimating; then obtaining a weighting coefficient based on the channel estimate.
  • the present invention modulates a user signal corresponding to each antenna group to each antenna unit of the antenna group, and performs weighting on each antenna group according to the weighting coefficient of each antenna group, and then transmits the data to the corresponding user.
  • Antenna units rather than all antenna groups, send the same data stream to different users.
  • H ( nl ' n2 ) is the channel estimation matrix of the antenna group pair user “ 2 ; the dimension of the channel estimation matrix is ( ⁇ , ), and W is a channel sampled in units of chip periods
  • the number of impulse response taps, ⁇ ⁇ 1 is the number of antenna elements included in the antenna group
  • h ( '"'" 2) represents the channel estimation matrix of the mth antenna in the antenna group n1 to the user ⁇ 2, and the dimension is (W, l ), 1 ⁇ ⁇ ⁇ ⁇ 1 .
  • the present invention obtains a method commonly used by those skilled in the art through channel estimation.
  • the spatial covariance matrix of each antenna group with respect to each user, the shape weight coefficient is obtained by the spatial covariance matrix and the channel estimation.
  • the covariance matrix is calculated according to the following formula:
  • R( "' , n2) is the antenna group corresponding to the user's spatial covariance matrix, dimension The number is ( ⁇ ', ⁇ "' ), ( ⁇ )" indicates the conjugate transposed matrix.
  • the shaping weight coefficient is obtained according to the received power of the user corresponding to the antenna group and the received power of the user corresponding to the other antenna group.
  • the present invention provides a specific implementation method that is implemented according to the following formula:
  • the method of obtaining the shaping weight coefficient can also realize the shaping coefficient of the interference suppression by the Schmidt orthogonalization method and the ⁇ transformation method, and obtain the weighting coefficient of the interference suppression in the Schmidt orthogonalization method.
  • the Schmitt orthogonalization matrix of each antenna group relative to each user is orthogonally transformed to form a weight coefficient orthogonal to other interference channels and in the same direction as the desired channel.
  • interference suppression beamforming can also be achieved by estimating the direction of arrival of the desired user and the interfering user.
  • the present invention provides a channel multiplexing method, which is applied to a transceiver that uses one or more antenna units to communicate with a plurality of remote users.
  • the antenna units are first grouped according to a predetermined rule, and the antenna groups are required to correspond to one user respectively (S1); then the data to be transmitted is spatially multiplexed to form a corresponding antenna group.
  • the data stream (S2); and each antenna group performs weighting processing on the transmitted data stream according to its corresponding weighting coefficient of each user (S3).
  • the data stream that is channel-multiplexed by the present invention is a data stream that is weighted by beamforming, and does not need to change the original receiving mode when receiving at the receiving end, and is difficult to design.
  • the method for obtaining the shape weight coefficient is the same as above, and will not be described again.
  • the predetermined rule for grouping antenna groups according to the present invention is that each antenna group is required to include more than or equal to the number of antenna groups in order to utilize the beamforming algorithm. Since the spacing between antenna groups for spatial multiplexing requires at least half a wavelength, in order to achieve the object, the present invention divides adjacently arranged antenna elements into one antenna group.
  • the number of users multiplexing a certain channel is such that the number of antenna units required by the base station is M ⁇ N 2 .
  • the M antenna elements are divided into N antenna groups, which are called antenna sub-arrays.
  • Each antenna group contains at least two antenna elements, and the antenna elements in the group are adjacently arranged to beamform the antennas in the group.
  • the user "," 1, L, N, which is at the " ⁇ 1, L ' ⁇ ” antenna
  • the channel impulse response on the cell is denoted by h — ⁇ j / 3 ⁇ 4 ' L ”.
  • the method for channel estimation of all antenna units in an antenna sub-array for N users sharing the same channel is:
  • any user other than the user nl corresponding to the antenna sub-array The channel estimation matrix of ⁇ is shown by the formula ( L 1 ), and the dimension is ( ⁇ ' ), wherein the antenna element included in the antenna sub-array is '
  • Each antenna sub-array corresponds to a user sharing the same channel to perform shaped reception or shaped transmission data.
  • the criterion for shaping is to suppress interference of other users sharing the same channel.
  • the shaping coefficient is as follows. Obtained:
  • beamforming can be performed on the antenna elements in the respective antenna sub-arrays.
  • each antenna unit in each antenna sub-array is weighted according to a respective shaping weight coefficient w and transmitted to each corresponding user.
  • each antenna unit is divided into three antenna sub-groups, and each antenna group is called an antenna sub-array, that is, the antenna sub-array shown in the figure. 1.
  • the antenna sub-array 2 and the antenna sub-array 3, and each antenna sub-array includes three antenna units for beamforming each user, for example, three antenna units 11 of the antenna sub-array 1.
  • the antenna elements 11, 12, and 13 of the antenna sub-array 1 transmit the data stream of the user 1 to the user 1 according to the beamforming coefficient, and the antenna elements 21 and 22 of the antenna sub-array 2 are also transmitted.
  • the user 2 data stream is weighted according to the beamforming coefficient and transmitted to the user 2; the antenna unit 31, 32, 33 of the antenna sub-array 3 weights the data stream of the user 3 according to the beamforming coefficient and transmits the data to the user.
  • the data stream segment of user 1 is first allocated to different antennas. Groups, the transmission data streams constituting the antenna group, and then each antenna group obtains the transmission weighting coefficients of the respective groups to the user 1. At this time, there is no interference with the user, and the interference term in the denominator in equation (1.3) is 0. According to the data stream transmitted in the above manner, due to the sufficient spacing between the antenna sub-arrays, the antenna sub-arrays are independent of each other. Therefore, when the channel correlation is small, spatial multiplexing between the antenna sub-arrays is adopted.
  • Figure 4 shows the day when the channel correlation is large.
  • the terminal is also unable to demodulate different data streams transmitted on multiple antennas.
  • the shaped beams of each antenna group form a main lobe in the user direction served by the antenna group, while in the other antenna groups, although the example of FIG. 3 is only one for each antenna group.
  • the spreading code distinguishes the data streams of different users, and the principle is the same as that of the conventional code division multiple access communication system using beamforming, and is not repeated here.
  • the user here can also be understood as multiple data streams sent from the same user terminal.

Landscapes

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

Abstract

La présente invention concerne un procédé de multiplexage d'une pluralité de canaux d'antennes, utilisé dans un transmetteur-récepteur adoptant une pluralité d'unités d'antenne pour communiquer avec une pluralité d'utilisateurs, qui comprend: - la séparation d'unités d'antenne en groupes basés sur des règles prédéterminées (S1), - la construction de données de transmission en attente dans les flux de données de transmission pour les groupes d'antennes correspondants en fonction d'un multiplexage de division spatiale (S2), - la transmission des flux de données après que chaque groupe d'antennes a pondéré les flux de données de transmission basés sur le facteur de pondération de formation de faisceau correspondant à chaque utilisateur (S3). Chaque groupe d'antennes transmet les données parallèles aux différents utilisateurs, adoptant ainsi un multiplexage par division spatiale entre chaque groupe d'antenne et utilise la forme de formation de faisceau pour transmettre les données parmi les unités d'antenne des groupes d'antennes, de manière à s'adapter à l'environnement différent des canaux.
PCT/CN2006/002415 2005-09-30 2006-09-15 Pluralite de procedes de multiplexage de canaux d’antennes WO2007036139A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN200510107985.9 2005-09-30
CN2005101079859A CN1941663B (zh) 2005-09-30 2005-09-30 多天线信道复用的方法及波束赋形的方法

Publications (1)

Publication Number Publication Date
WO2007036139A1 true WO2007036139A1 (fr) 2007-04-05

Family

ID=37899373

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2006/002415 WO2007036139A1 (fr) 2005-09-30 2006-09-15 Pluralite de procedes de multiplexage de canaux d’antennes

Country Status (2)

Country Link
CN (1) CN1941663B (fr)
WO (1) WO2007036139A1 (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101459457B (zh) * 2007-12-12 2013-01-16 鼎桥通信技术有限公司 一种波束赋形方法
CN101494488B (zh) * 2008-01-23 2013-06-05 电信科学技术研究院 一种通过极化天线传输数据的方法及装置
CN101771452B (zh) * 2008-12-26 2013-12-04 电信科学技术研究院 波束赋形颗粒度的指示方法、系统及设备
CN103259580B (zh) * 2012-02-15 2015-12-02 电信科学技术研究院 一种多数据流波束赋形向量确定方法及装置
CN103326766B (zh) * 2012-03-20 2016-12-28 电信科学技术研究院 一种双流波束赋形方法及装置
CN103491621B (zh) * 2012-06-12 2017-04-12 华为技术有限公司 多天线系统功率分配及波束赋形方法、基站及多天线系统
CN105591683A (zh) * 2014-10-23 2016-05-18 中兴通讯股份有限公司 数据接收方法、发送方法、接收装置及发送装置
CN106559361B (zh) * 2015-09-17 2019-08-09 清华大学 大规模多输入多输出天线系统的信道估计方法及装置
CN106992805A (zh) * 2016-01-21 2017-07-28 株式会社Ntt都科摩 多天线传输方法、基站和用户终端
CN106253957A (zh) * 2016-09-06 2016-12-21 北京北方烽火科技有限公司 波束赋形方法、装置及基站
CN109698715A (zh) * 2019-01-02 2019-04-30 华南理工大学 一种基于动态波束赋形的分布式天线系统及方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004051903A1 (fr) * 2002-12-05 2004-06-17 Matsushita Electric Industrial Co., Ltd. Systeme de radiocommunication, procede de radiocommunication, et dispositif de radiocommunication
CN1614905A (zh) * 2003-11-05 2005-05-11 索尼株式会社 无线通信系统、无线通信设备、无线通信方法和无线通信的计算机程序
CN1671076A (zh) * 2004-03-15 2005-09-21 株式会社东芝 具有发射机和发射天线的无线电发射设备

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004051903A1 (fr) * 2002-12-05 2004-06-17 Matsushita Electric Industrial Co., Ltd. Systeme de radiocommunication, procede de radiocommunication, et dispositif de radiocommunication
CN1614905A (zh) * 2003-11-05 2005-05-11 索尼株式会社 无线通信系统、无线通信设备、无线通信方法和无线通信的计算机程序
CN1671076A (zh) * 2004-03-15 2005-09-21 株式会社东芝 具有发射机和发射天线的无线电发射设备

Also Published As

Publication number Publication date
CN1941663B (zh) 2011-11-30
CN1941663A (zh) 2007-04-04

Similar Documents

Publication Publication Date Title
WO2007036139A1 (fr) Pluralite de procedes de multiplexage de canaux d’antennes
EP3504854B1 (fr) Système et procédé de transmission d'une sélection d'un sous-espace
Park et al. SPACE-MAC: Enabling spatial reuse using MIMO channel-aware MAC
US7020490B2 (en) Radio communication system
JP4369128B2 (ja) 無線通信システム
US20160105226A1 (en) Methods for Opportunistic Multi-User Beamforming in Collaborative MIMO-SDMA
US10103790B2 (en) Cooperative transmission system and cooperative transmission method for multiple access points in a wireless local area
JP5391335B2 (ja) 多入力多出力ビーム形成のデータ送信方法及び装置
CN110677178A (zh) 大规模mimo-noma系统中短包传输时延分析方法
WO2003009492A1 (fr) Procede et dispositif de transmission par multiples antennes avec retroaction descendante dans un systeme de communication sans fil
CN102404035B (zh) 一种短距通信中基于信道矩阵的干扰抑制波束形成方法
JP2001505723A (ja) 空間サブチャネルを用いた大容量無線通信
CN109474317B (zh) Mr预处理下硬件损伤大规模mimo双向中继系统功率分配方法
CN102624432B (zh) 多层波束成形方法及实现多层波束成形的终端
JP2013513331A (ja) 無線ネットワークにおけるダウンリンク・マルチユーザーｍｉｍｏ送信のための方法および装置
CN101237264A (zh) 基于无线传感网的虚拟mimo功率分配传输方案
JP2009153139A (ja) Ｍｉｍｏ下りリンクにおけるプリコーディング処理方法、装置及び基地局
CN101807979B (zh) 一种无线通信中基于单天线功率约束的多用户预编码方法
CN107959520B (zh) 一种全双工基站蜂窝网络的时隙干扰对齐方法
JP4040585B2 (ja) 適応アレーアンテナによる通信システムおよび通信方法
CN101771448B (zh) 空分复用与多输入多输出的结合方法及基站
JP2008236066A (ja) 空間多重伝送用送信方法および装置
CN101783699B (zh) 多用户mimo系统中下行链路的信号发射方法和装置
JP4765336B2 (ja) 無線通信装置及び無線通信方法
US20070297576A1 (en) Method and device for controlling channel state information transferred by a first telecommunication device to a second telecommunication device

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application
NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 06775667

Country of ref document: EP

Kind code of ref document: A1

点击 这是indexloc提供的php浏览器服务，不要输入任何密码和下载