A selection method for multi-input and multi-output space multiplexing pre-coding matrix

A precoding matrix and spatial multiplexing technology, applied in the field of precoding spatial multiplexing, can solve the problem of non-reciprocity of channels, and achieve the effect of improving communication performance

Inactive Publication Date: 2008-03-19
ZTE CORP
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Problems solved by technology

[0004] Most of the research on precoding is based on the assumption that the channel state information is completely known at the transmitter. However, in many MIMO systems, the uplink and downlink channels do not have recipr

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  • A selection method for multi-input and multi-output space multiplexing pre-coding matrix
  • A selection method for multi-input and multi-output space multiplexing pre-coding matrix
  • A selection method for multi-input and multi-output space multiplexing pre-coding matrix

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[0022] The present invention intends to provide a method for selecting a multi-input multi-output spatial multiplexing precoding matrix, which is used in a wireless communication system using closed-loop MIMO precoding method to improve communication performance by using a limited number of feedback bits, which mainly includes the following steps :

[0023] (101) Based on the principle of maximizing the two-norm minimum distance of the projection of the subspace, a set of precoding codebooks known to both the transmitter and the receiver are defined in advance;

[0024] (102) Store the precoding codebook in the transmitter and receiver;

[0025] (103) The receiver obtains the current channel information according to the pilot estimation, including the channel state information and the signal-to-noise ratio information of the current channel, and minimizes or maximizes the capacity or minimizes the determinant of the mean square error matrix. In principle, select a precoding matrix...

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Abstract

The invention discloses a selection method of MIMO spatial multiplexing precoding matrix, which mainly includes the following steps: firstly, pre-define a set of precoding codebook with known transmitter and a receiver; store the precoding codebook in the transmitter and the receiver; the receiver selects a precoding matrix from the pre-defined precoding codebook, according to the prior channel information by estimation. The receiver feedbacks selected precoding matrix index to the transmitter by a feedback channel in channel coherence time. The transmitter determines the prior selected precoding matrix, according to the received precoding matrix index. The invention utilizes limited feedback bit number to improve communication performance.

Description

technical field [0001] The present invention relates to the field of multi-antenna technology in wireless communication, and in particular to a precoding spatial multiplexing technology in a wireless communication system using Multiple Input Multiple Output (MIMO). Background technique [0002] A prominent feature of MIMO technology in the field of wireless communication is that it can greatly improve the spectrum efficiency (or system capacity) of the system and the reliability of the wireless link. Based on information theory, it can be deduced that if the total transmit power of each transmit antenna is the same (that is, assuming that the transmit end has no prior knowledge of the channel matrix), the capacity of the MIMO communication system increases linearly with min{Mt, Mr}, where Mt and Nr are respectively is the number of transmitting and receiving antennas. At the same time, some scholars have proposed that if the channel matrix is ​​fully or partially known at t...

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Application Information

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IPC IPC(8): H04L27/26H04B7/04
Inventor 沈晖辛雨朱晓光
Owner ZTE CORP
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