WO2011147333A1 - Procédé de traitement de précodage, dispositif de traitement de précodage et station de base - Google Patents

Procédé de traitement de précodage, dispositif de traitement de précodage et station de base Download PDF

Info

Publication number
WO2011147333A1
WO2011147333A1 PCT/CN2011/075207 CN2011075207W WO2011147333A1 WO 2011147333 A1 WO2011147333 A1 WO 2011147333A1 CN 2011075207 W CN2011075207 W CN 2011075207W WO 2011147333 A1 WO2011147333 A1 WO 2011147333A1
Authority
WO
WIPO (PCT)
Prior art keywords
base station
precoding matrix
interference
precoding
parameter
Prior art date
Application number
PCT/CN2011/075207
Other languages
English (en)
Chinese (zh)
Inventor
阮亮中
刘坚能
杜颖钢
刘晟
Original Assignee
华为技术有限公司
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
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Publication of WO2011147333A1 publication Critical patent/WO2011147333A1/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
    • H04B7/0413—MIMO systems

Definitions

  • Precoding processing method, precoding processing device and base station The present application is filed on October 29, 2010, the Chinese Patent Office, the application number is 201010530342. 6 , and the invention name is "precoding processing method, precoding processing device and base station" Priority of Chinese Patent Application, the entire contents of which is incorporated herein by reference.
  • the embodiments of the present invention relate to a multiple input multiple output technology, and in particular, to a precoding processing method, a precoding processing apparatus, and a base station, and belong to the field of communication technologies. Background technique
  • the interference problem between signals is a key bottleneck affecting its development.
  • an idea to solve the interference problem is to share the channel information between the signal transmitters instead of sharing the data to be transmitted, and then use the Interference Alignment (IA) method to automatically
  • the interference from the transmitter is summed to the signal space that the corresponding receiver can handle, thereby achieving interference cancellation.
  • the existing interference alignment method assumes an arbitrary Gaussian symbol, the interference is random, and the interference space can be regarded as unstructured.
  • the interference alignment is to align the desired interference to a space of a smaller dimension, and utilize the remaining "clean" "Dimensions to transmit useful signals.
  • An important assumption of the interference alignment method is that when the transmitter has multiple transmit antennas, the corresponding channels of each antenna are independently and equally distributed.
  • the embodiments of the present invention provide a precoding processing method, a precoding processing apparatus, and a base station, which can effectively reduce interference and improve a transmission rate.
  • the present invention provides a precoding processing method, including:
  • the data stream is precoded according to the precoding matrix.
  • the present invention also provides a precoding processing apparatus, including:
  • a parameter obtaining module configured to acquire a spatial channel correlation parameter of a communication system where the base station is located, and obtain an interference avoidance parameter according to the spatial channel correlation parameter;
  • a first calculating module configured to acquire an element value of a fixed element of the precoding matrix to be constructed according to the interference avoidance parameter
  • a second calculating module configured to obtain, according to the interference alignment algorithm, an element value of other elements except the fixed element in the precoding matrix to be constructed
  • a building block configured to construct a precoding matrix according to the obtained element value of the precoding matrix fixed element to be constructed and the element value of the element other than the fixed element in the precoding matrix to be constructed;
  • an encoding processing module configured to perform precoding processing on the data stream according to the precoding matrix.
  • the present invention also provides a base station including the above-described precoding processing apparatus.
  • the precoding processing method, the precoding processing device, and the base station provided by the embodiments of the present invention Obtaining the spatial channel correlation parameter of the communication system where the base station is located, and further obtaining the interference avoidance parameter, calculating the element value of the fixed element of the precoding matrix, and performing interference avoidance; and then calculating and acquiring other elements in the precoding matrix according to the interference
  • the element value is pre-coded by using the pre-encoding matrix obtained above, and the interference avoidance and interference alignment are extracted, which can effectively suppress the interference.
  • Embodiment 1 is a schematic flowchart of Embodiment 1 of a precoding processing method according to the present invention
  • 2A is a schematic diagram of interference alignment
  • 2B is a schematic diagram of interference avoidance
  • 2C is a schematic diagram of interference avoidance coordination interference alignment
  • Embodiment 3 is a schematic flowchart of Embodiment 2 of a precoding processing method according to the present invention.
  • Embodiment 4 is a schematic flowchart of Embodiment 3 of a precoding processing method according to the present invention.
  • FIG. 5 is a schematic structural diagram of Embodiment 1 of a precoding processing apparatus according to the present invention.
  • FIG. 6 is a schematic structural diagram of Embodiment 2 of a precoding processing apparatus according to the present invention. detailed description
  • FIG. 1 is a schematic flowchart of Embodiment 1 of a precoding processing method according to the present invention. As shown in FIG. 1, the method includes the following steps:
  • Step 101 Obtain a spatial channel correlation parameter of a communication system where the base station is located, and obtain an interference avoidance parameter according to the spatial channel correlation parameter.
  • each transmission is considered.
  • Step 102 Acquire an element value of a fixed element of a precoding matrix to be constructed according to the interference avoidance parameter.
  • Step 102 perform interference avoidance calculation according to the interference avoidance parameter to obtain precoding.
  • the data of the fixed element part of the matrix that is, the base station service user set, the effective virtual transmission angle position set corresponding to the base station, the effective transmit signal position set corresponding to the base station, and the avoidance user set may be considered, and the calculation is performed according to the principle of interference avoidance;
  • Step 103 Obtain an element value of the element other than the fixed element in the precoding matrix to be constructed according to the interference alignment algorithm.
  • the interference space that can be processed obtains the element values of the elements other than the above fixed elements in the precoding matrix, so that the precoding matrix obtained in the method considers two factors of interference avoidance and interference alignment;
  • Step 104 Construct a precoding matrix according to the obtained element value of the fixed element and element values of other elements except the fixed element, and further perform precoding processing on the data stream according to the precoding matrix.
  • the precoding processing method provided by the foregoing embodiment of the present invention obtains the spatial channel correlation parameter of the communication system where the base station is located, and further acquires the interference avoidance parameter, to calculate the element value of the fixed element of the precoding matrix, and performs interference avoidance;
  • the element values of other elements in the precoding matrix are calculated according to the interference, and the precoding of the data stream by using the precoding matrix obtained above can suppress the interference.
  • the interference avoidance parameter in the foregoing embodiment of the present invention may specifically include a base station service user set, an effective virtual transmission angle location set corresponding to the base station, an effective transmit signal location set corresponding to the base station, and a evasive user set.
  • the interference avoidance set at this time may further include a change set of the effective virtual transmission angle position corresponding to the base station, and the base station, based on the foregoing four parameters. A set of changes in the position of the corresponding effective transmitted signal, and the like.
  • the spatial channel correlation parameter in the foregoing embodiment is relatively fixed. Therefore, the interference avoidance parameter can be obtained in an offline manner according to the spatial channel correlation parameter, and stored in the storage module, where the precoding matrix is obtained according to the interference avoidance parameter.
  • the element value of the fixed element may be an interference avoidance parameter obtained from the storage module; or may be calculated in real time according to the performance coefficient of the communication system to obtain the interference avoidance parameter of the communication system where the base station is located.
  • the user of the evasive user group may be further obtained for the data receiving end to receive the data.
  • the equalizer for causing the data receiving end to perform interference cancellation on the received data stream may specifically calculate the equalizer of the other user by using the minimum interference leakage criterion, and may further include sending the acquired equalizer to The step corresponding to the user's user device.
  • the use of the above equalizer can take into account the processing of the data receiving end.
  • the data transmitting end can iteratively update the equalizer and the precoder with each other; for the determined equalization vector, after the quantization
  • the data receiving end is notified, and the data receiving end can perform interference cancellation processing on the received data stream according to the equalizer.
  • the spatial correlation of the channel matrix is considered, and the pre-coding matrix is obtained by using the interference avoidance and the interference alignment method.
  • the pre-coding may be further performed according to the zero-forcing algorithm and/or the minimum mean square error algorithm. The element values of the elements in the matrix are corrected.
  • the environment in which the user is located usually has a relatively rich scatterer, and the user's terminal device receives a signal refracted or reflected by a plurality of surrounding scatterers, resulting in correlation in the channel fading process.
  • the user's terminal device receives a signal refracted or reflected by a plurality of surrounding scatterers, resulting in correlation in the channel fading process.
  • not all transmitting antennas contribute to or interfere with the terminal equipment, that is, for a specific user, under certain channel conditions, through corresponding processing, it is possible to make a certain transmitting antenna
  • the user has no influence at all, and the transmitting antenna can transmit signals of other users without being interfered by the specific user, and does not cause interference to the user, that is, the principle of interference avoidance.
  • each base station has N t transmit antennas, and each base station has K ( K ⁇ N t ) users, each user has N r antennas, and the base station And the user distribution is expressed as and M mk , where
  • the channel of the kth user is ⁇ , and each base station selects a part of its K users to provide services, that is, SDMA in the traditional sense, and the degree of freedom that each selected user can obtain is (d f ⁇ N r , that is, processing at most independent data streams) ⁇
  • the selected set of service users is The " ⁇ cron I" operation here is the operation of finding the total number of elements in the "A" set.
  • the available dimension for each user is 4 spaces.
  • FIG. 2A, FIG. 2B and FIG. 2C are interference processing methods from the base station B 2 and the base station B 3 for the user M
  • FIG. 2A, FIG. 2B and FIG. 2C are interference processing methods from the base station B 2 and the base station B 3 for the user M
  • FIG. 2A, FIG. 2B and FIG. 2C are interference processing methods from the base station B 2 and the base station B 3 for the user M
  • FIG. 2A, FIG. 2B is a schematic diagram of interference avoidance, and FIG. 2C is a schematic diagram of interference avoidance coordination interference alignment. As shown in FIG.
  • a channel matrix H from base station B 2 and base station B 3 to user Mu 2 - u and 3 ⁇ 4 - u are mutually uncorrelated, and the signals of the base station B 2 and the base station B 3 can be aligned in the interference alignment manner at the receiving end of the user B 1 into a dimension of two spaces, so that the user M can smoothly transmit 2 Signal of dimensions; as shown in Figure 2B, Is the idea of interference avoidance, and the equivalent channel is not full rank (if the equivalent channel is full rank, then since the base station B 2 and the base station B 3 have already filled the 4D space, the base station will not be able to transmit signals),
  • the spatial presentation correlation, the base station B 2 to the user's equivalent channel matrix 3 ⁇ 4—the zero position appears in the upper right corner, and its rank becomes 3, that is, the base station ⁇ can use the position without interference to the user Mu (ie, corresponding Spatial dimension) transmission, similarly, B 3 to the equivalent channel matrix of the user M
  • Figure 2C Synthesis in both cases above, according to the principle of first interference avoidance and spatial relevance 3 ⁇ 4- "and 3 ⁇ 4-" empty out the right two dimensional grid, i.e., using the principle of interference avoidance selecting u 22 and u 32 U 2 respectively and The second column of U 3 , and then according to the idea of interference alignment, the interference from the base station B 2 in the upper left corner is aligned with the interference of the base station B 3 , that is, 3 ⁇ 4 - u *! ⁇ : !
  • Figure 2B above uses the idea of interference avoidance, where the equivalent channel is not full rank. If the equivalent channel is full rank, then the base station B 2 and the base station B 3 have already filled the 4-dimensional space, and the base station will not be able to transmit. signal.
  • the idea of the embodiment of the present invention shown in FIG. 2C firstly performs interference avoidance according to the spatial correlation of the channel matrix, and then aligns the interference signal to the interference space that the user can process according to the principle of interference alignment, and cannot perform interference.
  • the interference alignment is directly performed, that is, the steps of acquiring the elements in the precoding matrix corresponding to steps 102 and 103 in the embodiment shown in FIG. 3 above.
  • the set is ⁇
  • the step of obtaining the interference avoidance parameter according to the above parameters can be performed offline, and the precoding and equalizer calculation based on the instantaneous channel state calculation can only pass through the online The operation is performed, so the process can be divided into two parts: an offline part and an online part.
  • FIG. 3 shows a calculation flow of the offline part and the online part, that is, the step of acquiring the interference avoidance parameter corresponding to step 101 in the implementation shown in FIG.
  • T T ⁇ E sub , where is given by:
  • Step 403 For each selected user Mma k , according to whether the avoidance condition is established, whether it should belong to the avoidable user set M, the avoidance condition can be expressed as:
  • Step 404 Determine whether all selected users can use interference avoidance, that is, determine
  • Step 405 Update ⁇ ⁇ , that is, including determining whether all users can be processed by interference alignment, and determining whether all virtual transmission dimensions have been used for alignment, as shown in FIG. 4, where ⁇ is a base station set , Proceed as follows:
  • Step 4054 determining whether all virtual angles have been used for interference alignment, that is,
  • T n z ⁇ ,2,..., N , V «e ⁇ l,2,... G ⁇ is true, if yes, exit the algorithm and output the same result as the last calculation ⁇ ⁇ 7 ⁇ 7 ⁇ M , that is, all the base stations have been updated, then the iteration is stopped and the output is output. Otherwise, perform step 4 0 55 ;
  • ⁇ , remove any elements in ⁇ nE Economics-, otherwise, update ⁇ ⁇ — m , and from ⁇ Remove any kl -KnE,
  • Step 40 59 store ( , , 2 2 ⁇ , M me , and return to step 4 0 2 .
  • step 102 the calculation of the online part corresponds to step 102 and the steps in the embodiment shown in FIG.
  • the step of obtaining the value of each element in the precoding matrix may include the following steps: Step 501: Calculate an element value of the fixed element in the precoding matrix according to the ⁇ ⁇ 7 ⁇ 7 ⁇ outputted by the offline part. : n ⁇ J °ifp ⁇ &p ⁇ t n ( q )
  • H m E ak Q mak UR where ⁇ ⁇ is an orthogonal matrix and R k is an upper triangular matrix.
  • Step 503 Calculate the remaining part of the precoder and the equalizer of other users by using the principle of interference alignment
  • Step 504 Perform interference suppression by using a zero-forcing or MMSE algorithm in the intra-cell SDMA, that is, correct the element values of each element in the pre-coding matrix according to the zero-forcing algorithm and/or the minimum mean square error algorithm.
  • the precoding processing method provided by the foregoing embodiment of the present invention first performs interference avoidance according to the spatial correlation of the channel matrix, and then aligns the interference signal to the interference space that the user can process according to the principle of interference alignment, and can effectively suppress multiple transmissions. Interference between signals in an antenna communication system.
  • the embodiment of the present invention further provides a precoding processing apparatus, which is capable of performing the precoding processing method in the foregoing embodiment
  • FIG. 5 is a schematic structural diagram of an embodiment of the precoding processing apparatus according to the present invention.
  • the device includes a parameter acquisition module 11, a first calculation module 12, a second calculation module 13, a construction module 14, and an encoding processing module 15, and a parameter acquisition module.
  • the method for obtaining the spatial channel correlation parameter of the communication system where the base station is located, and obtaining the interference avoidance parameter according to the spatial channel correlation parameter; the first calculating module 12 is configured to obtain the precoding matrix to be constructed according to the interference avoidance parameter.
  • the precoding processing apparatus obtained by the foregoing embodiment of the present invention obtains the spatial channel correlation parameter of the communication system where the base station is located, and further acquires the interference avoidance parameter, to calculate the element value of the fixed element of the precoding matrix, and performs interference avoidance;
  • the element values of other elements in the precoding matrix are calculated according to the interference, and the precoding of the data stream by using the precoding matrix obtained above can suppress the interference.
  • the interference avoidance parameter in the foregoing embodiment of the present invention may specifically include a base station service user set, an effective virtual transmit angle location set corresponding to the base station, an effective transmit signal location set corresponding to the base station, and a evasive user set, and refer to a valid virtual angle class parameter.
  • the change in the communication system is relatively slow, and thus can be obtained and stored in a pre-calculated manner.
  • the pre-coding processing apparatus provided in the foregoing embodiment may further include a storage module 19, the storage module 19 For storing the interference avoidance parameter obtained in an offline manner according to the spatial channel correlation parameter, the parameter acquisition module 11 described above may obtain the interference avoidance parameter from the storage module 19.
  • the first equalizer acquisition module 16 and the second equalizer acquisition module 17 are further included, and the first equalizer acquisition module 16 is configured to acquire the user concentration in the communication system where the base station is located.
  • the second equalizer acquiring module 17 is configured to acquire, in the communication system where the base station is located, other users except the users in the centralized user group, An equalizer for causing the data receiving end to perform interference cancellation on the received data stream.
  • the data correction module 18 may be further configured to modify the element values of the elements in the precoding matrix according to the zero forcing algorithm and/or the minimum mean square error algorithm.
  • the embodiment of the invention further provides a base station, which comprises the precoding processing device provided in the above embodiment.
  • the base station can obtain the spatial channel correlation parameter of the communication system where the base station is located, obtain the interference avoidance parameter according to the spatial channel correlation parameter, and calculate the element value of the fixed element of the precoding matrix to implement the interference avoidance;
  • the element values of other elements in the precoding matrix are calculated and pre-coded by using the precoding matrix obtained above, which can suppress the interference.

Abstract

La présente invention se rapporte à un procédé de traitement de précodage, à un dispositif de traitement de précodage et à une station de base. Ledit procédé de traitement de précodage consiste à : acquérir les paramètres de corrélation des canaux spatiaux du système de communication dans lequel se trouve la station de base, et acquérir des paramètres d'évitement des interférences selon les paramètres de corrélation des canaux spatiaux (101) ; acquérir des valeurs d'élément des éléments fixes d'une matrice de précodage qui doit être construite selon les paramètres d'évitement des interférences (102) ; acquérir les valeurs d'élément des autres éléments à l'exception des éléments fixes de la matrice de précodage qui doit être construite selon un algorithme d'alignement des interférences (103) ; construire la matrice de précodage selon les valeurs d'élément acquises des éléments fixes de la matrice ce précodage qui doit être construite, et les valeurs d'élément des autres éléments à l'exception des éléments fixes dans la matrice de précodage qui doit être construite ; précoder les flux de données au moyen de la matrice de précodage (104). Le procédé de traitement de précodage, le dispositif de traitement de précodage et la station de base proposés dans la présente invention permettent de supprimer de façon efficace les interférences.
PCT/CN2011/075207 2010-10-29 2011-06-02 Procédé de traitement de précodage, dispositif de traitement de précodage et station de base WO2011147333A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201010530342.6 2010-10-29
CN201010530342.6A CN102457360B (zh) 2010-10-29 2010-10-29 预编码处理方法、预编码处理装置以及基站

Publications (1)

Publication Number Publication Date
WO2011147333A1 true WO2011147333A1 (fr) 2011-12-01

Family

ID=45003330

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2011/075207 WO2011147333A1 (fr) 2010-10-29 2011-06-02 Procédé de traitement de précodage, dispositif de traitement de précodage et station de base

Country Status (2)

Country Link
CN (1) CN102457360B (fr)
WO (1) WO2011147333A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103476125A (zh) * 2013-09-03 2013-12-25 郑州大学 一种机会干扰对齐中用户调度的优化方法和系统

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106817704A (zh) * 2015-11-27 2017-06-09 索尼公司 频谱接入方法以及使用该方法的设备
TWI608710B (zh) * 2016-12-06 2017-12-11 財團法人工業技術研究院 通道預編碼的方法及應用其的基地台與伺服器
CN111869139B (zh) * 2018-11-26 2022-05-20 Oppo广东移动通信有限公司 一种数据处理方法、设备及存储介质
CN116388813A (zh) * 2021-12-22 2023-07-04 中兴通讯股份有限公司 预编码矩阵获取方法、装置、电子设备和存储介质
CN114826837B (zh) * 2022-05-05 2023-05-12 中山大学 一种信道估计方法、装置、设备及存储介质

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101765119A (zh) * 2009-12-10 2010-06-30 华中科技大学 一种基于ofdma无线蜂窝网络的动态分数频率复用方法
US20100227613A1 (en) * 2009-03-03 2010-09-09 Young-Doo Kim Communication system of selectively feeding back information about interference channels for interference alignment and method for operating the system
US20100265813A1 (en) * 2009-04-20 2010-10-21 Pereira Stephanie F Wireless network and method for adaptive opportunistic clustering for interference alignment in wireless networks

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1832387A (zh) * 2005-03-10 2006-09-13 松下电器产业株式会社 多输入多输出无线通信系统中的多输入多输出检测方法和装置
KR101639240B1 (ko) * 2009-03-03 2016-07-13 삼성전자주식회사 랜덤 빔포밍 기술을 이용하여 간섭 제어를 수행하는 통신 시스템 및 통신 방법

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100227613A1 (en) * 2009-03-03 2010-09-09 Young-Doo Kim Communication system of selectively feeding back information about interference channels for interference alignment and method for operating the system
US20100265813A1 (en) * 2009-04-20 2010-10-21 Pereira Stephanie F Wireless network and method for adaptive opportunistic clustering for interference alignment in wireless networks
CN101765119A (zh) * 2009-12-10 2010-06-30 华中科技大学 一种基于ofdma无线蜂窝网络的动态分数频率复用方法

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103476125A (zh) * 2013-09-03 2013-12-25 郑州大学 一种机会干扰对齐中用户调度的优化方法和系统
CN103476125B (zh) * 2013-09-03 2016-07-13 郑州大学 一种机会干扰对齐中用户调度的优化方法和系统

Also Published As

Publication number Publication date
CN102457360B (zh) 2014-08-13
CN102457360A (zh) 2012-05-16

Similar Documents

Publication Publication Date Title
CN107438957B (zh) 用于指示无线通信网络中的预编码器参数的方法和设备
Wang et al. Outage constrained robust transmit optimization for multiuser MISO downlinks: Tractable approximations by conic optimization
Chalise et al. Optimization of MIMO relays for multipoint-to-multipoint communications: Nonrobust and robust designs
WO2011147333A1 (fr) Procédé de traitement de précodage, dispositif de traitement de précodage et station de base
JP6388710B2 (ja) 空間干渉アライメントを用いたマルチセルネットワークでの無線全２重スケーリング
WO2009030102A1 (fr) Procédé de codage à l'avance et de planification pour utilisateurs multiples et station de base pour mettre en œuvre le procédé
JP5204255B2 (ja) 多重受信アンテナ受信機での線形マルチユーザプリコーディング
US20200366341A1 (en) Software-defined massive multi-input multi-output (mimo)
WO2015101017A1 (fr) Procédé et appareil de formation de faisceau coordonnée basée sur un alignement de brouillage partiel
JP2009141957A (ja) Ｍｉｍｏシステムのプレコーディング伝送方法
WO2011137829A1 (fr) Procédé et dispositif d'alignement d'interférences et système de communication multicanal
Vu et al. Joint resource allocation to minimize execution time of federated learning in cell-free massive MIMO
WO2011137753A1 (fr) Procédé et dispositif pour l'acquisition d'une matrice de précodage
WO2010130085A1 (fr) Procédé d'élimination d'interférences et dispositif de transmission de données
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
Kwon et al. Limited feedback hybrid beamforming for multi-mode transmission in wideband millimeter wave channel
WO2014166285A1 (fr) Méthode assurant la continuité de phase de canal entre des groupes de rb après précodage, station de base, et support de stockage lisible par ordinateur
Reifert et al. Rate-splitting multiple access in cache-aided cloud-radio access networks
WO2016037477A1 (fr) Procédé de traitement d'appariement d'utilisateur, dispositif et station de base
US8391390B2 (en) Methods and apparatus for determining beamforming transformations for each of a plurality of subcarriers in a MIMO communications channel
JP6641506B2 (ja) データの送信を行う方法及びデバイス
Jiang et al. Joint transmit precoding and reflect beamforming for IRS-assisted MIMO-OFDM secure communications
TW201145875A (en) Optimizing a receiver for multiple antenna configurations
KR102118389B1 (ko) 기지국장치 및 기지국장치의 동작 방법
CN108370286A (zh) 用于高级接收机的信道状态信息框架

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 11786105

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 11786105

Country of ref document: EP

Kind code of ref document: A1