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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。
Aiming at the situation that the total transmit power of the system is fixed and the Nakagami-m fading channel is independent and inconsistent between the source node, the relay node and the destination node, we deduce that the system uses the transcoding cooperative mode (including fixed decoding Forwarding (FDF), Selective Decode Forwarding (SDF). On this basis, the strategy of optimal power allocation that minimizes the system outage probability is further discussed. The simulation results show that the interrupt performance of SDF cooperative method is superior to the interrupt performance of FDF cooperative method, especially when the channel transmission quality is poor, such as the average signal-to-noise ratio of the channel is small or the fading coefficient is small. In addition, the use of cooperative communication can significantly improve the interrupt performance of the system when the quality of the direct channel transmission between the source node and the destination node is worse than that between the relay node and the destination node.