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WO2010130101A1 - Procédé, dispositif et système pour précodage de canal - Google Patents

Procédé, dispositif et système pour précodage de canal Download PDF

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Publication number
WO2010130101A1
WO2010130101A1 PCT/CN2009/071810 CN2009071810W WO2010130101A1 WO 2010130101 A1 WO2010130101 A1 WO 2010130101A1 CN 2009071810 W CN2009071810 W CN 2009071810W WO 2010130101 A1 WO2010130101 A1 WO 2010130101A1
Authority
WO
WIPO (PCT)
Prior art keywords
delay difference
cell
precoding
channel matrix
channel
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/CN2009/071810
Other languages
English (en)
Chinese (zh)
Inventor
吴涛
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huawei Technologies Co Ltd
Original Assignee
Huawei Technologies 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 Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Priority to CN200980123654.0A priority Critical patent/CN102077485B/zh
Priority to PCT/CN2009/071810 priority patent/WO2010130101A1/fr
Publication of WO2010130101A1 publication Critical patent/WO2010130101A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L25/03343—Arrangements at the transmitter end
    • 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
    • H04B7/0452—Multi-user MIMO systems

Definitions

  • the present invention relates to the field of mobile communication technologies, and in particular, to a channel precoding method, apparatus, and system.
  • wireless broadband or “broadband wireless”
  • WCDMA R99 peak rate close to 314kbps
  • WCDMA HSDPA peak rate close to 3Mbps
  • LTE Long Term Evolution
  • LTE-A Long Time Evolution Advanced
  • 3GPP believes that LTE itself can serve as the technical basis and core for meeting IMT-A requirements, but purely from the perspective of indicators, there is still a gap between LTE and IMT-A requirements. Therefore, when upgrading LTE to 4G, it is not necessary to change the core of the LTE standard, and only needs to be expanded, enhanced, and improved on the basis of LTE to meet the requirements of IMT-A. For this reason, LTE-A is for this reason. Been proposed.
  • CoMP Coordinatd Multiple Point Transmission and Reception
  • multi-user MIM ⁇ multiple input multiple output
  • at least two cells provide services to at least one UE (user equipment), and at this time, one exists
  • the problem is that the time at which each cell signal arrives at the UE may be inconsistent.
  • the channel matrix used in channel precoding currently does not take this into consideration, that is, the actual influence of the inconsistency of each cell signal on the UE on the channel matrix is not considered.
  • the performance of the multi-user MIMO CoMP is greatly affected, thereby reducing the throughput of the entire system. Summary of the invention
  • the solution provided by the present invention includes:
  • a channel precoding method for a multi-user MIMO communication system in CoMP, in which at least two cells in the system provide services to at least one UE, the method includes: acquiring a delay of each cell signal reaching each UE Poorly compensating a pre-obtained channel matrix by using a delay difference of each of the cell signals to each UE; selecting a precoding matrix according to the compensated channel matrix, and performing the compensated channel matrix by using the precoding matrix Precoding processing.
  • a channel precoding apparatus configured for a multi-user MIMO communication system in a CoMP, where at least two cells in the system provide services to at least one UE, the apparatus includes: a delay difference acquisition unit, configured to acquire each a channel matrix determining unit, configured to obtain a downlink channel of each UE in each cell, to form a channel matrix, and a channel compensation unit, configured to use the time delay difference acquiring unit to obtain each of the a delay difference of the cell signal to each UE, and a channel matrix determined by the channel matrix determining unit; a precoding unit, configured to select a precoding matrix according to the channel matrix compensated by the channel compensation unit, and use the pre The coding matrix performs precoding processing on the compensated channel matrix.
  • a channel precoding system the system is a multi-user MIMO communication system under CoMP, comprising at least one base station and at least two UEs, at least two cells in the system providing services to at least one UE, the UE, A delay difference for detecting the arrival of each cell signal, and providing a delay difference to the base station; the base station, using a delay difference of each cell signal provided by each UE to each UE to compensate a pre-obtained channel matrix And selecting a precoding matrix according to the compensated channel matrix, and performing precoding processing on the compensated channel matrix by using the precoding matrix.
  • a channel precoding system the system is a multi-user MIMO communication system under CoMP, in which at least two cells belonging to one base station control provide services to at least one UE, and the UE is used for
  • the base station sends an uplink signal; the base station estimates the delay difference of each cell signal to each UE according to the received uplink signal of each UE, and obtains the delay difference of each cell signal to each UE in advance.
  • the channel matrix is compensated and selected according to the compensated channel matrix And selecting a precoding matrix, and performing precoding processing on the compensated channel matrix by using the precoding matrix.
  • the embodiment of the present invention considers the influence of the delay difference of each cell signal on the UE, and compensates the channel matrix by using the delay difference, so that a more accurate channel precoding processing result can be obtained, and the system can be greatly improved. Throughput, improve system performance.
  • Figure 1 is a schematic diagram of a communication system of multi-user MIMO under CoMP
  • FIG. 2 is a flowchart of a channel precoding method according to an embodiment of the present invention.
  • FIG. 3 is a flowchart of a channel precoding method according to an embodiment of the present invention.
  • FIG. 4 is a flowchart of a channel precoding method according to Embodiment 2 of the present invention.
  • FIG. 5 is a flowchart of a three-channel precoding method according to an embodiment of the present invention.
  • FIG. 6 is a schematic structural diagram of a channel precoding apparatus according to an embodiment of the present invention.
  • Both UE1 and UE2 are located at the edge of the cell or the base station, where Cell A (cell A) is the serving cell of UE1, Cell B (cell B) is the serving cell of UE2, and Cell A and Cell B may belong to the same base station. Can also belong to different base stations;
  • the wireless network includes Cell A and Cell B) to obtain the downlink channels HH 2 , H 3 and H.
  • the channel matrix is
  • the downlink channel, H 2 , and H p H 4 can be obtained in the existing manner, for example, by using the reciprocity of the channel in the TDD mode, or obtained according to the channel characteristic information reported by the UE in the FDD mode.
  • the received signal can be expressed as .Formula 1
  • the selection of the precoding matrix is in accordance with the following principles: Ensure that the channel gain (H 3 w 2 + H 4 w 4 ) of the desired signal y is large enough to interfere with the gain of the signal X.
  • FIG. 2 it is a flowchart of a channel precoding method according to an embodiment of the present invention, including:
  • S203 Select a precoding matrix according to the compensated channel matrix, and perform precoding processing on the compensated channel matrix by using a precoding matrix.
  • precoding processing is performed on the compensated channel matrix by selecting an appropriate precoding matrix, wherein the principle of selecting the precoding matrix is to make the channel gain of the useful signal large enough, The gain of the interfering signal is small enough to be negligible.
  • the embodiment of the present invention takes into account the delay difference of each UE receiving different cell signals, and compensates the channel matrix by using the delay difference, and obtains the actual channel matrix as:
  • the delay can be expressed as a phase shift, which is the number of subcarriers, and N is the number of points of the FFT (Fast Fourier Transform).
  • the actual signal received by UE1 is: .Form 3
  • the precoding matrix selection principle is:
  • FIG. 3 is a flowchart of a channel precoding method according to an embodiment of the present invention, where the flowchart is based on a figure
  • the flow of steps in the system shown in 2 includes:
  • S301 UE1 and UE2 feed back the arrival delay difference and ⁇ 2 between the measured Cell A and Cell B signals to the network side.
  • S302 The network side compensates the two cells and the two UEs by using the delay difference, and obtains the compensated channel matrix.
  • the delay difference obtained by the UE measurement is provided to the network side, and the network side compensates the channel matrix by using the delay difference, and finally selects a suitable precoding according to the compensated channel matrix.
  • the matrix pre-codes the compensated channel matrix.
  • the scheme can obtain more accurate channel precoding processing results, which can greatly improve system throughput and improve system performance.
  • the UE provides the delay difference to the network side, so that the network side does not need to make too many changes, and the implementation is relatively simple. Referring to FIG.
  • Figure 4 it is a flowchart of a second channel precoding method according to an embodiment of the present invention, which is also a flow chart according to the system shown in FIG.
  • Figure 4 includes:
  • S401 The network side estimates, according to the received uplink signals of UE1 and UE2, a delay difference between the downlink signals of Cell A and Cell B and UE1, and a delay difference between UE2 and UE2.
  • S402 The network side compensates the transmission channel matrix between the two cells and the two UEs by using a delay difference, and obtains the compensated channel matrix e.
  • the main difference of the flow shown in FIG. 4 is that the delay difference is not provided by the UE, but the delay difference is estimated on the network side.
  • This scheme is particularly suitable for the Cell and the Cell.
  • the channel matrix is performed by using the delay difference.
  • compensating in addition to being compensated, it can also be compensated.
  • the subsequent accurate channel precoding results can also be implemented.
  • the above two embodiments are described by taking two cells and two UE multi-user systems under CoMP as an example.
  • the embodiment of the present invention may also extend to a system of multi-user MIMO under CoMP of M cells and L UEs, where M is greater than or equal to 2, and L is greater than or equal to 1.
  • multi-user MIMO has M cells serving L UEs simultaneously in the system under CoMP, and the signal transmitted by the k-th cell is ⁇ ⁇ , and the signal sent to the j-th user UEj is represented by ⁇ , indicating the k-th cell.
  • a precoding matrix used for the user UEj signal; a delay difference between the signal of the jth cell and the serving cell of the UEi (assumed to be the cell z) reaching the UE i, r 3 ⁇ 4 0, indicating that the sampling frequency is used The value obtained after the transformation.
  • FIG. 5 it is a flowchart of a method for three-channel precoding according to an embodiment of the present invention, including:
  • S502 The transmission channel matrix between the M cells and the L UEs on the network side is compensated by using the delay information fed back by the UE, to obtain a compensated new transmission channel matrix.
  • the channel matrix before compensation is:
  • the compensated channel matrix is:
  • the selected precoding matrix is:
  • the S501 can also use the S401-like manner to estimate the signal delay difference of each UE for each cell on the network side.
  • the embodiment shown in FIG. 5 introduces a channel precoding scheme of a multi-user MIMO communication system under CoMP including M cells and L UEs, which is a general embodiment.
  • the embodiment of the present invention further provides a channel precoding apparatus, where the apparatus is used for a multi-user MIMO communication system in a CoMP, where at least two cells provide services to at least one UE.
  • the device is a device located on the network side, for example, may be a base station device, or may be a functional entity located inside the base station device, and may be implemented by hardware, software, or a combination of hardware and software.
  • the device includes:
  • the channel compensation unit 603 is configured to compensate the channel matrix determined by the channel matrix determining unit 602 by using the delay difference of each cell signal acquired by the delay difference acquiring unit 601 to each UE; the precoding unit 604 is configured to The channel compensation unit 603 selects a precoding matrix by the compensated channel matrix, and performs precoding processing on the compensated channel matrix by using a precoding matrix.
  • the delay difference obtaining unit 601 has two implementation manners. Specifically, the delay difference obtaining unit 601 may include a delay difference receiving subunit or a delay difference estimating subunit. Wherein, the delay difference receiving subunit, a delay difference for receiving each cell signal from each UE to each UE; a delay difference estimation subunit, configured to estimate, according to an uplink signal of each UE received by each cell, each cell signal arrives at each UE The delay, wherein each cell belongs to the same base station control.
  • the delay difference between the two cells reaching the first UE is, and the two cells arrive at the second UE.
  • the delay difference is ⁇ 7
  • the pre-obtained channel matrix is
  • the communication system under CoMP includes at least one base station and at least two UEs, where at least two cells in the system provide services to at least one UE, where: the UE is configured to detect a delay difference of signal arrival of each cell Providing a delay difference to the base station; the base station compensating a pre-obtained channel matrix by using a delay difference of each cell signal provided by each UE to each UE, and precoding the compensated channel matrix deal with.

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

Abstract

L'invention concerne un procédé, un dispositif et un système pour précodage de canal, qui sont utilisés dans un système de communications à entrées multiples et sorties multiples (MIMO) à utilisateurs multiples avec réception et transmission de points multiples coordonnés (CoMP). Au moins deux cellules fournissent un service à au moins un équipement utilisateur (UE) du système. Le procédé consiste à : obtenir une différence de retard du signal pour chaque cellule arrivant sur chaque UE (S201); compenser une matrice de canal obtenue antérieurement par la différence de retard du signal pour chaque cellule arrivant sur chaque UE (S202); mettre en œuvre un traitement de précodage sur la matrice de canal compensée (S203).
PCT/CN2009/071810 2009-05-15 2009-05-15 Procédé, dispositif et système pour précodage de canal Ceased WO2010130101A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN200980123654.0A CN102077485B (zh) 2009-05-15 2009-05-15 信道预编码方法、装置及系统
PCT/CN2009/071810 WO2010130101A1 (fr) 2009-05-15 2009-05-15 Procédé, dispositif et système pour précodage de canal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2009/071810 WO2010130101A1 (fr) 2009-05-15 2009-05-15 Procédé, dispositif et système pour précodage de canal

Publications (1)

Publication Number Publication Date
WO2010130101A1 true WO2010130101A1 (fr) 2010-11-18

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CN (1) CN102077485B (fr)
WO (1) WO2010130101A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2479658A (en) * 2011-04-27 2011-10-19 Renesas Mobile Corp Compensating for propagation delays in coordinated multi-point transmission
CN102412933A (zh) * 2011-11-30 2012-04-11 北京邮电大学 协作多点多用户mimo系统的预编码方法及矩阵生成装置
WO2013120383A1 (fr) * 2012-02-17 2013-08-22 中兴通讯股份有限公司 Procédé de précodage de transmission multipoint coordonnée, terminal et station de base
WO2014012366A1 (fr) * 2012-07-19 2014-01-23 华为技术有限公司 Procédé de détermination de matrice de précodage, dispositif et système de communication associés
US8638867B2 (en) 2011-04-27 2014-01-28 Broadcom Corporation Methods and apparatus for compensating for propagation delays in coordinated multi-point transmission
US8731001B2 (en) 2011-05-31 2014-05-20 Broadcom Corporation Methods and apparatus for determining participants in coordinated multi-point transmission
WO2018126940A1 (fr) * 2017-01-06 2018-07-12 索尼公司 Dispositif électronique, appareil et procédé de radiocommunication

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US20070211816A1 (en) * 2006-02-28 2007-09-13 Samsung Electronics Co., Ltd. Apparatus and method for transmitting and receiving signals in a multi-antenna system
CN101123594A (zh) * 2006-08-08 2008-02-13 上海贝尔阿尔卡特股份有限公司 用于多入多出基带处理的系统、装置及方法
CN101325442A (zh) * 2007-06-14 2008-12-17 华为技术有限公司 多天线系统及其数据发送方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070211816A1 (en) * 2006-02-28 2007-09-13 Samsung Electronics Co., Ltd. Apparatus and method for transmitting and receiving signals in a multi-antenna system
CN101123594A (zh) * 2006-08-08 2008-02-13 上海贝尔阿尔卡特股份有限公司 用于多入多出基带处理的系统、装置及方法
CN101325442A (zh) * 2007-06-14 2008-12-17 华为技术有限公司 多天线系统及其数据发送方法

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2479658A (en) * 2011-04-27 2011-10-19 Renesas Mobile Corp Compensating for propagation delays in coordinated multi-point transmission
US8638867B2 (en) 2011-04-27 2014-01-28 Broadcom Corporation Methods and apparatus for compensating for propagation delays in coordinated multi-point transmission
US8731001B2 (en) 2011-05-31 2014-05-20 Broadcom Corporation Methods and apparatus for determining participants in coordinated multi-point transmission
CN102412933A (zh) * 2011-11-30 2012-04-11 北京邮电大学 协作多点多用户mimo系统的预编码方法及矩阵生成装置
CN102412933B (zh) * 2011-11-30 2014-10-15 北京邮电大学 协作多点多用户mimo系统的预编码方法及矩阵生成装置
WO2013120383A1 (fr) * 2012-02-17 2013-08-22 中兴通讯股份有限公司 Procédé de précodage de transmission multipoint coordonnée, terminal et station de base
WO2014012366A1 (fr) * 2012-07-19 2014-01-23 华为技术有限公司 Procédé de détermination de matrice de précodage, dispositif et système de communication associés
CN103580738A (zh) * 2012-07-19 2014-02-12 华为技术有限公司 预编码矩阵确定方法及相关设备和通信系统
CN103580738B (zh) * 2012-07-19 2017-09-29 华为技术有限公司 预编码矩阵确定方法及相关设备和通信系统
WO2018126940A1 (fr) * 2017-01-06 2018-07-12 索尼公司 Dispositif électronique, appareil et procédé de radiocommunication
CN110214423A (zh) * 2017-01-06 2019-09-06 索尼公司 电子装置、无线通信设备和无线通信方法
US10721023B2 (en) 2017-01-06 2020-07-21 Sony Corporation Electronic device, radio communication apparatus, and radio communication method

Also Published As

Publication number Publication date
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CN102077485A (zh) 2011-05-25

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