协同DF-OFDM系统中基于MRC的机会中继研究

针对机会中继译码转发协同系统中未考虑直传链路的问题,提出一种由目的节点根据系统中断概率进行中继选择的方案,研究了将机会中继信号与直传信号在目的节点进行最大比合并时的系统性能,推导了采用最大比合并时的系统中断概率。研究结果表明,当直传链路存在时,通过目的节点的中继选择,可使系统性能得到进一步提高,其性能优于不考虑直传链路时的机会中继系统。

Opportunistic Relay in Cooperative DF-OFDM Networks based on MRC

As the direct link is often ignored in opportunistic relay selection of transmission cooperative system, this paper proposes a relay selection strategy carried by destination node based on outage probability criterion. Moreover, system performance of MRC (Maximal-Ratio-Combine) method to combine opportunistic relay signals and direct-link signals in destination node is studied, and the system outage probability under MRC also analyzed. Research results indicate that when a direct link exists, the system is further enhanced in performance by relay selection of destination node and it outperforms opportunistic relay selection scheme without direct link.