多跳合作网络中非再生协议的性能分析与比较

Analysis and Comparison of Non-Regenerative Protocols for Multi-Hop Cooperative Networks

根据不同的多跳合作网络结构,研究了单节点中继时的5种合作发送协议.在瑞利衰落环境下,从系统容量和分集的观点分析和比较了这些协议非再生时的性能,并考虑了中继节点移动时对性能的影响.理论和仿真分析表明,合作系统在一定条件下可实现2阶全分集,如VMISO(virtual multiple input single output)系统仅在中继节点靠近源节点时为2阶分集,而靠近目的节点时却退化为1阶分集.因合作系统需2倍的时隙资源,其容量要低于单跳传输的情况.

Based on different multi-hop cooperative network configurations, five single-relaying cooperative transmitted protocols were investigated. Their non-regenerative performances were analyzed and compared from a capacity and a diversity point-of-view over Rayleigh fading environments. And some impacts of the mobility of the relaying nodes on the performances were considered. The simulated resuits and theoretic analysis show that the cooperative systems can offer the two-order full diversity at some given manners, e.g. virtual multiple input single output （VMISO） system achieves two-order diversity if the relaying node is close to the source node. However, it will degrade to one-order diversity if the relaying node is close to the destination node. Since these cooperative systems need two times time-slot resources corresponding to the single-hop systems, the capacity of the former is smaller than that of the latter.