多中继混合转发协作传输策略研究

Performance Research of Multi-relay Hybrid-forwarding Cooperative Transmission Scheme

为了优化多中继协作通信系统的性能,提出了一种多中继混合转发协作传输策略(Multiple-Relay Hybrid-Forwarding Cooperative Transmission Scheme,MRHF-CTS)。该策略考虑多中继协作通信系统中的译码转发与放大转发以及两种转发方式带来的性能缺陷,根据协作中继节点接收信号的译码结果选择转发方式,同时引入协作中继节点之间数据来传输对系统性能的增益。对系统中断概率性能进行了推导与分析,结果表明,该策略在消除放大转发策略噪声累积的基础上,能够有效抑制协作中继节点错误检测译码转发给系统带来的不利影响,明显提升系统性能;在大信噪比情况下,可获得多中继译码转发协作通信系统的最佳性能。

In order to overcome the shortcomings of decode-and-forward and amplify-and-forward transmission, a multi- relay hybrid-forwarding cooperative transmission scheme （MRHF-CTS） was proposed to optimize the performance of cooperative communication system, which selects the style of forwarding according to the result of decoding at relay nodes and uses the broadcast channels among relay nodes to improve the transmission reliability of multi-relay wireless networks. The performance characterizations in terms of outage probabilities are developed. The results show that in contrast to decode-and-forward and amplify-and-forward scheme, MRHF-CTS offers a superior performance. And in the high signal-to-noise ratio （SNR） regime, the optimal performance of decode-and-forward transmission is gained.