Asymptotic performance of hybrid-selection/maximal-ratio combining over fading channels

被引：28
作者：
Ma, Yao [1 ]
Wang, Zhengdao
Pasupathy, Subbarayan
机构：
[1] Iowa State Univ, Dept Elect & Comp Engn, Ames, IA 50011 USA
[2] Univ Toronto, Commun Grp, Dept Elect & Comp Engn, Toronto, ON M5S 3G4, Canada
来源：
IEEE TRANSACTIONS ON COMMUNICATIONS | 2006年 / 54卷 / 05期
基金：
美国国家科学基金会;
关键词：
coding gain; diversity gain; error and outage probabilities; generalized selection combining (GSC); hybrid-selection/maximal-ratio combining (HS/MRC);
D O I：
10.1109/TCOMM.2006.874013
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
In this letter, we study the asymptotic performance of hybrid-selection/maximal-ratio combining (HS/MRC) and post-detection HS/equal-gain combining (HS/EGC) over generalized fading channels for large average signal-to-noise ratios (ASNRs). By evaluating the asymptotic moment generating function of the HS/MRC output SNR at high ASNR, we derive the diversity and coding gains for HS/MRC for a large class of modulation formats and versatile fading conditions, including different types of fading channels and nonidentical SNR statistics across diversity branches. Our analytical results reveal that the diversity gains of HS/MRC and HS/EGC are equivalent to that of MRC, and the difference in the coding gains for different modulation formats is manifested in terms of a modulation factor defined in this letter. Some new analytical results about effects of the number of combined branches for HS/MRC and noncoherent combining loss of HS/EGC are also provided.
引用
收藏
页码：770 / 777
页数：8
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