放大转发协作通信中继位置对SER性能的影响

针对放大转发协作网络多跳中继节点位置对系统性能的影响，分析了端到端链路的误码率. 根据误码率并通过设定不同节点间距离来确定最优中继位置. 针对多跳中继网络，提出了基于信道状态信息的节点选择算法，在不同的选取准则下以最小值最大化为目标. 为了考虑中继位置，进而提出基于节点位置信息的中继节点选择算法，确保选择一个最低误码率的节点为协作节点. 仿真结果表明，多跳中继最优位置处于源节点和目的节点的中点处. 与已有放大转发模式下的单跳中继相比，多跳中继在系统具有较低的总传输功率时具有更好的性能.

Impact of Relay Location on SER for Amplify-and-Forward Cooperative Communications

In this paper, we analyze the symbol error rate (SER) for end-to-end link in amplify-and-forward (AF) cooperative networks. An optimal relay position is made by setting the distance between nodes. A multihop relay selection algorithm based on channel state information (CSI) is proposed, which is the expansion of single-hop relay selection to ensure the lowest SER of the cooperative node. A multi-hop relay selection algorithm based on node position is then investigated according to the impact of node position on system performance. Simulation results indicate that the optimal multi-relay position is at the midpoint between the source and destination nodes, and the multi-hop method provides significant performance gain in terms of total energy over the exiting AF relay selection algorithms.