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Information estimation and feedback method in multi-antenna relay system

A relay system, multi-antenna technology, applied in the field of precoding transmission, can solve the problems of channel estimation error, wireless relay system performance impact, and quantization error, etc.

Active Publication Date: 2014-05-28
SOUTHEAST UNIV
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AI Technical Summary

Problems solved by technology

[0004] In practical wireless communication systems, channel estimation and limited feedback techniques are usually used to obtain channel information, resulting in channel estimation errors and quantization errors, which will affect the performance of the wireless relay system and reduce the capacity of the relay system

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  • Information estimation and feedback method in multi-antenna relay system
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Embodiment Construction

[0026] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings.

[0027] Such as figure 1 As shown, an information estimation and feedback method in a multi-antenna relay system of the present invention includes the following steps:

[0028] Step 1) The base station has M antennas, the relay has N antennas, the user is a single antenna, and there are K users in total. The perfect channel information matrix from the base station to the relay is H, and the perfect channel vector from the relay to user k is g k , where M≥N=K, 1≤k≤K; M, N, K and k are all positive integers;

[0029] Step 2) Relay the N×β sent by the base station 1M orthogonal pilot signals, estimate the channel from the base station to the relay, and obtain the estimated channel matrix from the base station to the relay β sent by the kth user through the relay 2 N orthogonal pilot signals, estimate the channel relayed to the kth user, and o...

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Abstract

The invention discloses an information estimation and feedback method in a multi-antenna relay system. The method comprises the following steps that 1) a perfect channel information matrix from a base station to a relay is H, and a perfect channel vector quantity from the relay to a user k is gk; 2) the bit number needed by the relay for channel quantization and the bit number needed by the user for the channel quantization are calculated by the relay and the user; 3) the precoded matrix of downlink sent signals of a base station side is obtained by the relay; 4) the relay precoded matrix of relay side forwarded signals is obtained; 5) the base station obtains the precoded matrix, the sending signal vector quantity of the base station is a formula in the specification, relay received signal is a formula in the specification, the relay forwards the received signals, the relay sending signal vector quantity is a formula in the specification, and the user receives the signals sent by the relay. The transmission method can expand the coverage range of a cell of origin, and controllable speed losses can be obtained.

Description

technical field [0001] The invention belongs to the field of precoding transmission methods in a multi-user multi-antenna relay system, and specifically relates to an information estimation and feedback method in a multi-antenna relay system. Background technique [0002] Relay technology is considered to be a technology that can effectively solve the performance of edge cells in traditional wireless cellular communication systems. At the same time, the capacity of the wireless communication system can be improved by applying multiple-input multiple-output (multiple-input multiple-output: MIMO for short) technology. Combining relay technology and MIMO technology, the advantages of these two technologies can be fully utilized, while improving the edge rate of the cell and increasing the coverage of the cellular network. [0003] However, perfect channel information is required for MIMO technology to maximize system capacity. However, in actual wireless communication systems...

Claims

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Application Information

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IPC IPC(8): H04L25/02H04L25/03
Inventor 许威彭张节赵春明
Owner SOUTHEAST UNIV
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