Rice衰落信道下选择中继的性能分析与功率分配算法  

Performance Analysis and Power Allocation Algorithm for Selective Relay Systems over Rice Fading Channels

作　　者：陈贤明[1] 蔡跃明 蔡春晓[1,2] 杨炜伟[1,2] 

机构地区：[1]解放军理工大学通信工程学院,南京210007 [2]东南大学移动通信国家重点实验室,南京210096

出　　处：《信号处理》2011年第3期381-386,共6页Journal of Signal Processing

基　　金：国家自然科学基金(60972051;61001107);国家科技重大专项(2010ZX03006-002-04);东南大学移动通信国家重点实验室开放研究基金(2010D09)资助课题

摘　　要：本文针对无线传感器网络,研究了Rice衰落信道下基于选择中继的两跳译码转发系统的协同中继传输性能与功率分配算法。文中利用概率密度函数推导了选择中继协同传输的中断概率、误符号率的闭式表达式,并给出了高信噪比时的渐近性表达式;然后根据渐近性能进行源与中继节点间的功每优化,进一步提升系统传输性能;最后用蒙特卡洛仿真验证了结果的有效性。仿真结果显示,理论值与仿真结果基本一致,优化功率分配后的传输性能接近于搜索法得到的传输性能,但计算复杂度明显降低。In this paper,we research on the transmission performance and power allocation algorithm for selective relay dual-hop decode-and-forward cooperative relaying systems over Rice fading channels in wireless sensor networks（WSNs）.Firstly,we derive the closed-form expressions of the outage probability and average symbol error probability,and asymptotic expressions in the high Signal-Noise -Ratio regime.Kor increasing the transmission performance,then we propose an optimizing power allocation algorithm between the source node and the relay node according to the asymptotic performance.At last the Monte Carlo simulations are given to validate our analysis. The results show that the theoretical value is identical to the simulation value and the power allocation algorithm is close to the transmission performance of power searching method,but our algorithm can reduce the complexity of calculation obviously.

关 键 词：无线传感器网络 Rice衰落信道 译码转发 协同中继 功率分配 

分 类 号：TN911.2[电子电信—通信与信息系统]