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Selection preprocess method for downlink link antenna of multi-user MIMO system

A technology for downlink and antenna selection, applied in diversity/multi-antenna systems, transmission systems, synchronization/start-stop systems, etc. Improve performance, improve performance, achieve the effect of multi-user transmission

Inactive Publication Date: 2007-10-03
HARBIN ENG UNIV
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Problems solved by technology

However, the disadvantage of this method is that it only considers how to remove the co-channel interference between users, and does not consider the influence of the received signal-to-noise ratio on demodulation, resulting in poor system performance

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  • Selection preprocess method for downlink link antenna of multi-user MIMO system
  • Selection preprocess method for downlink link antenna of multi-user MIMO system
  • Selection preprocess method for downlink link antenna of multi-user MIMO system

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with accompanying drawing and specific embodiment:

[0026] In conjunction with Figure 1, the working principle of the traditional multi-user MIMO system downlink is: 101 is the channel information source unit, which forms the channel transmission matrix from the obtained channel information between the base station and each user; 102 is the preprocessing matrix The calculation unit of basis utilizes the output of module 101 to obtain the basis of the preprocessing matrix of each user; 103 is the generating unit of any unitary matrix; 104 is a data source unit; 105 is a space-time coding unit, and the output of module 104 is obtained by Space-time orthogonal block code and space multiplexing are combined for coding; 106 is a transmitting antenna array unit; 107 is a receiving antenna array unit; 108 is a single user detection unit. h (1) , H (2) ,...,H (K) is the output signal of unit 101, V (1) , ...

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Abstract

An antenna-selection preprocessing method of multi-user MIMO system down link includes setting up model of multi-user MIMO system down link to confirm coding mode and channel transmission matrix, confirming base of preprocessing matrix of each user by channel transmission matrix between base station and each user, utilizing said channel transmission matrix and said base to confirm optimum unitary matrix of each user preprocessing matrix, converting said model to be equivalent vector form and using linear zero-approach means to realize signal detection.

Description

(1) Technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a downlink antenna selection preprocessing method. (2) Background technology [0002] The MIMO (Multiple Input Multiple Output) system is very simple in concept. Any wireless communication system that uses multiple antennas or antenna arrays at both ends of the wireless link constitutes a MIMO system. In a multipath environment, the MIMO system can double the capacity of the communication system without increasing the bandwidth, and the channel fading problem can be overcome by the method of space-time coding. [0003] But for a multi-user MIMO system, in addition to overcoming the problem of channel fading, the problem that needs to be solved is the problem of co-channel interference (CCI, Co-Channel Interference) between users. If the co-channel interference between users is not removed, It will have a great impact on the detection and estimation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/06H04B1/707H04L1/06H04L25/49
Inventor 张林波刘彤田园张曙田野赵旦峰
Owner HARBIN ENG UNIV
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