非一致Nakagami-m信道下DF协同通信的中断性能  

Outage Performance of DF Relaying in Non-identical Nakagami-m Fading Channels

作　　者：钱涛[1] 辜方林[1] 李为[1] 魏急波[1] 

机构地区：[1]国防科学技术大学电子科学与工程学院,湖南长沙410073

出　　处：《军事通信技术》2015年第1期28-34,共7页Journal of Military Communications Technology

基　　金：国家自然科学基金资助项目(91338105)

摘　　要：针对系统发射总功率固定,同时源节点、中继节点和目的节点之间为独立且不一致的Nakagami-m衰落信道的情形,推导了该情形下系统采用译码转发协同通信方式(包括固定译码转发(FDF)、选择性译码转发(SDF))的中断概率。在此基础上,进一步讨论了使系统中断概率最小的最佳功率分配的策略。仿真分析结果表明,SDF协同方式的中断性能优于FDF协同方式的中断性能,特别是在信道传输质量较差的情况下,如信道的平均信噪比较小或衰落系数较小。此外,当源节点与目的节点之间的直传信道传输质量劣于中继节点与目的节点之间的信道时,使用协同通信才能明显改善系统的中断性能。In this paper, an exact expression was derived for outage probability of a relay net- work with Decode-and-Forward（DF） strategy when the total transmit power in the system is fixed and the channels between the source node, the relay node and the destination node are inde- pendent but non-identical Nakagami-m fading channel. Further investigation was made into the optimal power allocation strategy between the source node and the relay node based on the de- rived outage probability. The simulation results show that the Selection Decode-and-Forward （SDF） mode outperforms the Fixed Decode-and-Forward（FDF） mode in terms of outage behav- ior, especially when the S-D channel is poor, such as the average Signal-to-Noise Ratio（SNR） be- ing low or the fading coefficient being small. On the other hand, the advantage of the cooperative strategy is only distinct when the S-D channel is poorer than the R-D channel.

关 键 词：译码转发 中断概率 最佳功率分配 

分 类 号：TN911.2[电子电信—通信与信息系统]