Outage analysis of opportunistic multi-antenna relay selection in decode-and-forward relay networks

doi:10.1016/S1005-8885(09)60480-5

中国邮电高校学报(英文) ›› 2010, Vol. 17 ›› Issue (4): 6-12.doi: 10.1016/S1005-8885(09)60480-5

Outage analysis of opportunistic multi-antenna relay selection in decode-and-forward relay networks

王晓湘郑子云

1. 北京邮电大学电信工程学院
2. 北京邮电大学信息与通信工程学院
3. 北邮信通院

收稿日期:2009-07-13 修回日期:2010-01-22 出版日期:2010-08-30 发布日期:2010-08-31
通讯作者: 郑子云 E-mail:zzyun_bupt@foxmail.com
基金资助:
国家863计划“2007AA01Z265”“2009AA01Z247”

Outage analysis of opportunistic multi-antenna relay selection in decode-and-forward relay networks

WANG Xiao-xiang ZHENG Zi-yun

Key Laboratory of Universal Wireless Communications, Ministry of Education, Beijing University of Posts and Telecommunications, Beijing 100876, China

Received:2009-07-13 Revised:2010-01-22 Online:2010-08-30 Published:2010-08-31
Supported by:
This work was supported by the Hi-Tech Research and Development Program of China (2009AA01Z247, 2007AA01Z265), and the National Natural Science Foundation of China (60972076).

摘要/Abstract

摘要：

This article studies the closed-form expressions of outage performance for opportunistic relay under aggregate power constraint in decode-and-forward (DF) relay networks over Rayleigh fading channels, assuming that multiple antennas are available at the relay node. According to whether instantaneous signal-to-noise ratio (SNR) or average SNR can be utilized for relay selection, two opportunistic relay schemes, opportunistic multi-antenna relay selection (OMRS) and average best relay selection (ABRS) are proposed. The performances of both two schemes are evaluated by means of theoretical analysis and simulation. It is observed that OMRS is outage-optimal among multi-antenna relay selection schemes and closely approaches the beamforming (BF) scheme known as theoretical outage-optimal. Compared with previous single-antenna opportunistic relaying (OR) scheme, OMRS brings remarkable performance improvement, which is obtained from maximum ratio combining (MRC) and beamforming techniques. It is also shown that the performance of ABRS in asymmetric channels is close to OMRS in the low and median SNR range.

关键词:

relay selection, multiple antennas multiple relays, decode and forward, cooperative networks

Abstract:

Key words:

relay selection, multiple antennas multiple relays, decode and forward, cooperative networks

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Outage analysis of opportunistic multi-antenna relay selection in decode-and-forward relay networks

Outage analysis of opportunistic multi-antenna relay selection in decode-and-forward relay networks

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