一种新型无线传感网络中继功率分配方案

摘要

文中针对的是无线传感网中，传感器节点处于瑞利衰落信道中，系统的模型是两跳型AF中继模型，并且在总功率受限的情况下，研究如何通过功率分配以获得最大的瞬时输出信噪比( SNR)，以及如何通过设置中继的位置，以获得最小的误符号率( SER)的问题。通过运用数学的最优化分析法给出了最优功率分配的数学闭合解，并通过Matlab仿真得出最佳中继位置应为两用户连线位置上的中点。结果表明采用最优功率分配方案和最佳的中继位置，系统可以获得最大的SNR和最小的SER。%Study sensors in Wireless Sensor Networks ( WSN) ,while the channel is Rayleigh fading channel and adopt two hop AF model to relay signals,how to obtain the biggest SNR through power allocation while the total power is restricted,and how to obtain the least SER through the relay sensor's position. Use optimization analysis method to get the optimal power allocation and solution,and the best relay position through Matlab simulation which is at the middle of the two nodes. Results show that the optimal power allocation and the best relay position can acquire the biggest SNR and least SER.