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Communication method of multi-input multi-output system assisted by relay

A communication method and multi-output technology, applied in the field of distributed limited feedback precoding, can solve the problem of not being able to obtain the transmission diversity gain of the direct link, and achieve the effects of reducing feedback overhead, reducing feedback delay, and high spectral efficiency

Inactive Publication Date: 2011-04-27
SOUTHEAST UNIV
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  • Claims
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AI Technical Summary

Problems solved by technology

When the direct link is good, the algorithm cannot obtain the transmit diversity gain of the direct link

Method used

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  • Communication method of multi-input multi-output system assisted by relay
  • Communication method of multi-input multi-output system assisted by relay
  • Communication method of multi-input multi-output system assisted by relay

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Embodiment Construction

[0049] The present invention will be further described below in conjunction with the accompanying drawings.

[0050] A communication method for a relay-assisted multiple-input multiple-output system, wherein the relay-assisted multiple-input multiple-output system in the communication method is such as figure 1 As shown, it includes a transmitting end with M antennas, a relay station with L antennas, and a mobile receiving end with N antennas. The relay-assisted MIMO system transmits K channels at a time Data flow, wherein K is the minimum value among M, L, and N, and the transmitting end and the relay forwarding station, the relay forwarding station and the mobile receiving end need to store the same codebook respectively, and the codebook contains at least A precoding matrix; the communication method first judges whether the mobile receiving end needs to utilize the transmission diversity of the direct link, and then proceeds as follows:

[0051] (1) The mobile receiving en...

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Abstract

The invention discloses a communication method of a multi-input multi-output system assisted by a relay. The multi-input multi-output system assisted by a relay in the communication method comprises a transmitting end with M antennas, a relay transferring station with L antennas and a mobile receiving end with N antennas, wherein K paths of data streams are transmitted by the multi-input multi-output system assisted by the relay every time, and K is the minimum value of M, L and N. The communication method of the multi-input multi-output system assisted by the relay can remarkably improve thereceiving end frequency spectrum efficiency by adaptively utilizing the cooperative diversity gain of a through chain under the premise of low complexity and low feedback cost; and compared with the limited feedback precoding technology of the common relay assisted communication system, the adaptive selection cooperative diversity scheme is optimal.

Description

technical field [0001] The present invention relates to a wireless communication system, in particular to a distributed limited feedback precoding method of a relay-assisted multiple-input multiple-output wireless communication system. Background technique [0002] The relay wireless communication system has the advantages of expanding the coverage of the cell, overcoming the "dead zone" effect, improving the channel quality at the receiving end of the cell boundary, and overcoming the shadow effect. The idea of ​​relay communication was proposed more than 30 years ago. This idea is the simplest three-point communication, which includes a transmitter, a relay station and a receiver, and these three nodes have only one antenna. In recent years, researchers have studied relay communication from the perspectives of relay protocol, information theory, and specific algorithms. For example, for a wireless relay communication system with single input and single output, there are th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/06H04L1/00
Inventor 杨绿溪余辉黄永明
Owner SOUTHEAST UNIV
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