Outage analysis of opportunistic relay and beamforming in DF relay networks over Nakagami-m fading channels  

作　　者：刘臻 

机构地区：[1]School of Information and Communication Engineering,Beijing University of Posts and Telecommunications

出　　处：《High Technology Letters》2010年第4期422-427,共6页高技术通讯（英文版）

基　　金：Supported by the High Technology Research and Development Programme of China (No. 2007AA01Z265;2009AA01Z247);the National Natural Science Foundation of China (No. 60972076)

摘　　要：In this paper, the outage performance of opportunistic relay （OR） and equal gain transmissionbeamfomaing （EGT-BF） are studied in decode-and-ibrward （DF） relay networks over Nakagami-m fading channels, assuming multiple relays are available in the networks. We derive the moment generation function （MGF） of the received signal-to-noise ratio （SNR） at the destination, then obtain the exact closedform solution of OR and the approximate closed form expression of EGT-BF in terms of outage probability respectively through numerical inversion of Laplace transform. Simulation results are given to verify the correctness of theoretical analysis. We also compare the outage performance of OR and EGT-BF with oth- er transmission strategies and find that when decoding results of relays are available at the destination, OR achieves high performance and is the optimal scheme to achieve the tradeoff between performance and overheads. When relay decoding information is unachievable, the performance of OR degrades significant- ly, and the EGT-BF is a more preferred scheme.In this paper,the outage performance of opportunistic relay ( OR) and equal gain transmissionbeamforming(EGT-BF) are studied in decode-and-forward (DF) relay networks over Nakagami-m fadingchannels,assuming multiple relays are available in the networks.We derive the moment generation function(MGF) of the received signal-to-noise ratio (SNR) at the destination,then obtain the exact closedformsolution of OR and the approximate closed form expression of EGT-BF in terms of outage probabilityrespectively through numerical inversion of Laplace transform.Simulation results are given to verify thecorrectness of theoretical analysis.We also compare the outage performance of OR and EGT-BF with othertransmission strategies and find that when decoding results of relays are available at the destination,OR achieves high performance and is the optimal scheme to achieve the tradeoff between performance andoverheads.When relay decoding information is unachievable,the performance of OR degrades significantly,and the EGT-BF is a more preferred scheme.

关 键 词：cooperative conuuunication opportunistic relay （OR） BEAMFORMING outage probability Nakagami-m 

分 类 号：TN92[电子电信—通信与信息系统]