Patent
Multi-user precoding method and device combining non-code book and code book
Lihua Li,Ping Zhang,Qi Sun,Wang Xin,Gang Sun +4 more
- 07 Nov 2012
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TL;DR: In this paper, a multi-user precoding method and a device combining a non-code book and a code book are presented, where users are grouped according to the reciprocity degree through measuring the channel reciprocity.
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Abstract: The invention relates to the technical field of wireless mobile communication and discloses a multi-user precoding method and a device combining a non-code book and a code book. According to the method, the channel reciprocity characteristic of a TDD system is fully utilized, users are grouped according to the reciprocity degree through measuring the channel reciprocity, the users with better reciprocity are coded on basis of the non-code book, and the users with worse reciprocity are coded on basis of the code book, as a result, the code book-based multi-user MIMO (Multiple Input Multiple Output) precoding performance is effectively improved.
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Citations
Patent
Method and device in user equipment and base station used for wireless communication
Zhang Xiaobo
- 06 Aug 2019
TL;DR: In this article, a method and device in user equipment and a base station used for wireless communication is presented, in which user equipment monitors first-class signaling and second-class signalling in first time-frequency sub-resources and second time frequency sub-sub-resources, respectively, and the first information set is used for indicating whether the first signaling is correctly received.
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Patent
Method and apparatus used in user equipment for wireless communication, and method and apparatus used in base station for wireless communication
Wu Keying,Zhang Xiaobo +1 more
- 28 May 2020
TL;DR: In this article, a method and apparatus used in a user equipment for wireless communication, and a method used in the base station for wireless communications, are presented, where the first signaling comprises scheduling information of a first wireless signal, and the first index is used for determining a transmitting antenna port of the first signal.
References
Patent
Down and up multi-user multi-input multi-output pre-coding method and codebook thereof
Yang Guo
- 25 Feb 2009
TL;DR: In this article, the uplink/downlink multiuser multiple-input multiple-output (MU-MIMO) precoding method of a system and a codebook thereof are presented.
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Patent
Pre-coding method and system in MIMO system with multiple users
Xiaofeng Tao,Shu Fang,Ping Wu,Lihua Li,Ping Zhang,Zhou Hua +5 more
- 13 Apr 2011
TL;DR: In this paper, a precoding method consisting of a first codebook and a second codebook are arranged at a base station and a user terminal, and the second code book is a set of unitary matrices generated by vectors in the first book and by making use of channel matrices, vectors that ensure that the user terminal obtains the maximum coding gain are respectively selected for every user terminal in the book and corresponding CQI values are calculated.
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Patent
Pre-coding method for multi-user MIMO system
Lihua Li,Ping Zhang,Xiangchuan Gao,Lei Song,Hualei Wang,Chaowei Wang +5 more
- 09 Mar 2011
TL;DR: In this article, the authors proposed a pre-coding method for a multi-user MIMO (multi-input multi-output) system, which comprises the following steps of: acquiring a channel matrix of each user of the system by feedback or TDD (time division duplex) system channel reciprocity; acquiring an orthogonal vector base matrix according to a channel pseudo-inverse sentence of each UEs; acquiring a precoding merging matrix of UEs according to the channel matrixof each UE and the optimal merging matrix.
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Patent
User choosing method, device and system
Ping Gong,Jingyang Lu,Xuehong Lin,Liang Fang,Zhenshan Zhao,Xu Lei,Wei Hu +6 more
- 12 Jan 2011
TL;DR: In this article, the authors present a user choosing method, a device and a system consisting of a user terminal and a base station. And the system comprises a storing module, a user grouping module, and a user group choosing module.
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Patent
Non-codebook-precoding-based transmission method for multi-input multi-output (MIMO) system
Lihua Li,Ping Zhang,Xiangchuan Gao,Qi Sun,Lei Song,Xiaoliang Xu +5 more
- 13 Jul 2011
TL;DR: In this paper, a non-codebook-precoding-based transmission method for a multi-input multi-output (MIMO) system is proposed, which comprises the following steps that: a transmitting end acquires the channel information of the previous time by using feedback or specific channel reciprocity of a time division duplexing (TDD) system, acquires a unitary matrix Q and a lower triangular matrix L in which elements on a diagonal are arranged in a descending order of the probability by performing sequential LQ decoding (SLQD) operation on the
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