过时信道状态下译码转发中继选择的优化

Optimization of decode-and-forward relay selection under outdated channel state

针对实际通信系统中反馈延迟这一非理想因素,进行了译码转发方式下的中继选择优化研究。针对机会中继选择(ORS)通过选择合适的协作节点参与协作来减少系统功耗和降低成本,但反馈延迟会影响最佳协作中继的选择从而导致协作通信系统性能变差的情况,提出了一种在过时信道下优化机会中继选择方法,以选出最佳中继节点参与协作过程。仿真结果表明,优化机会中继选择降低了译码转发方式下协作通信系统的平均误码率,改善了系统的信道容量,提高整个通信系统性能。

Aiming at the feedback delay factor in a practical communication system, the relay selection optimization under decode-and-forward was studied. In view of the fact that opportunistic relay selection （ORS） can lower the system＇s power consumption and cost by selecting suitable nodes for their participation, while feedback delay deteriorates the performance of the cooperative communication system due to its influence on the selection of optimal cooperative re- lay, a method for optimal opportunistic relay selection under the outdated channel state was proposed to chose opti- mal relay nodes to cooperate in the communication system. The simulation results showed that the optimal relay se- lection reduced the average bit error rate of a cooperative communication system under the mode of decode-and-for- ward, increased the channel capacity of the system, and improved the performance of the whole system.