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.
CN102104404AActive Publication Date: 2011-06-22NTT DOCOMO INC
3 Cites 46 Cited by

Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
NTT DOCOMO INC
Publication Date
2011-06-22

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

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.
Need to check novelty before this filing date? Find Prior Art

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...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More