Multi-user MIMO transmission method in wireless communication system, base station and user terminal

A wireless communication system and multi-user technology, which is applied in the field of wireless communication, can solve the problems of solution 2, such as implementation obstacles, poor numerical stability, and high complexity of SVD decomposition, so as to reduce feedback overhead, improve spectrum efficiency, and facilitate engineering implementation.

Active Publication Date: 2011-06-22
NTT DOCOMO INC
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Problems solved by technology

However, the complexity of SVD decomposition is very high, and the numerical stability is poor, which makes the realization of the second scheme have certain obstacles
At the same time, scheme two requires that the uplink and downlink must use the same wireless channel for data transmission, which sometimes cannot be satisfied in the actual cellular system, and also limits the feasibility of uplink MU-MIMO in scheme two

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  • Multi-user MIMO transmission method in wireless communication system, base station and user terminal
  • Multi-user MIMO transmission method in wireless communication system, base station and user terminal
  • Multi-user MIMO transmission method in wireless communication system, base station and user terminal

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[0076] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and examples.

[0077] In one embodiment of the present invention, the system model of MU-MIMO transmission is as follows figure 1 As shown, this model considers the case of one base station (eNB) and two users (UE), and these two UEs are independent users selected through multi-user scheduling. The eNB has 4 antennas, and each UE has 2 antennas. It should be noted that since there may be many users in the cellular system, before MU-MIMO transmission, several users with independent spatial channels should be selected by means of multi-user scheduling algorithm to participate in MU-MIMO transmission. In the following description, only consider how to perform MU-MIMO transmission between independent users after multi-user scheduling is completed.

[0078] against figu...

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Abstract

The invention discloses a multi-user multiple input multiple output (MU-MIMO) transmission method in a wireless communication system, a base station and a user terminal. The method comprises the following steps that: the base station receives detection pilot frequency SRS of N users to perform channel estimation and acquires downlink channel information according to the channel estimation result and channel reciprocity of the system, wherein N is more than 1; the base station performs quick response (QR) decomposition on the downlink channel information, acquires a multi-user beamforming (MU-BF) matrix P (i) of the ith user from a Q matrix acquired through decomposition, and acquires a downlink single-user beamforming (SU-BF) matrix V (i) of the ith user further, wherein i=1, ...,N; and the base station performs beamforming processing on transmitting data of the ith user according to the MU-BF matrix P (i) and the SU-BF matrix V (i). The method and equipment acquire beamforming matrixes for uplink and downlink MU-MIMO transmission by means of the channel reciprocity of the system and the QR decomposition, and the MU-MIMO transmission performance can be improved.

Description

technical field [0001] The present invention relates to the field of wireless communication, in particular to a multi-user multiple-input multiple-output (MU-MIMO) transmission method in a wireless communication system (such as an LTE-A system), a base station and a user terminal for MU-MIMO transmission. Background technique [0002] Multiple Input Multiple Output (MIMO) technology has become one of the key technologies of broadband wireless communication systems including 3GPP Long Term Evolution (LTE) because it can effectively improve the spectrum efficiency of wireless links. According to whether multiple users can be supported simultaneously on the same time-frequency resource, MIMO technology can be further divided into single-user MIMO (SU-MIMO) and multi-user MIMO (MU-MIMO). Among them, MU-MIMO has more advantages, such as supporting more flexible user antenna configuration, stronger adaptability to channel conditions, and multi-user diversity gain. MU-MIMO is appl...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/04H04B7/26
Inventor 侯晓林张战加山英俊
Owner NTT DOCOMO INC
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