采用ORS与MRC的协同SDF分集增益研究  

Opportunistic Relay in Cooperative SDF Networks Based on MRC

作　　者：李俊杰[1] 王欣[1] 魏急波[1] 吴世奇[2] 赵萌[3] 

机构地区：[1]国防科技大学电子科学与工程学院,长沙410073 [2]中国西南电子技术研究所,成都610036 [3]西昌卫星发射中心,西昌615000

出　　处：《信息化研究》2015年第4期48-53,61,共7页INFORMATIZATION RESEARCH

摘　　要：针对传统的机会中继系统中未考虑直传路径的问题,论文研究了在接收端将直传信号与机会中继信号进行最大比合并时的系统性能,分析了三种选择译码转发中继选择实现方案的性能优劣,推导了系统的中断概率并且巧妙地利用夹逼定理得到系统的分集增益。理论推导和仿真结果都表明,对于存在直传链路的中继系统,以最大比合并的方式在接收端将中继转发信号和直传信号进行合并可以进一步提高系统性能;中继结点采用选择译码转发方式的系统性能明显优于固定译码转发方式。Considering that the direct link is often neglected in traditional opportunistic relay system,in this paper we analyze the performance of the relay network which utilizes maximal-ratio-combine（MRC）method to combine signals from the direct link and the opportunistic relay and investigate three selective decode and forward（SDF）relay selection strategies.The system outage probability is analyzed and diversity order is obtained using Squeeze Theorem skillfully.Study results confirms that for a relay system with a direct link,its performance is enhanced by MRC and it performs better with SDF than with fixed decode and forward（FDF）.

关 键 词：中继选择 中断概率 最大比合并 选择译码转发 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]