无线并行放大转发中继传输中基于信噪比的功率分配研究

SNR-Based Power Allocation in Wireless Parallel Amplify-and-Forward Relay Transmissions

在无线通信网中,高效的功率分配可显著降低资源消耗、获得更好的服务质量、并减少网络内干扰.本文以无线并行中继协作通信系统为背景,在目的节点目标信噪比的约束条件下,对如何最小化中继链路中各通信节点的发射功率进行了研究.文章首先建立了无线中继协作通信系统模型,推导出了无线中继协作通信系统中信噪比的表达式.接着,文章将功率分配问题建模为一个组合优化问题.运用凸优化理论,文章进一步提出一种计算时间复杂度较低的次最优功率分配算法.仿真结果表明,本文提出的算法计算复杂度低而且性能稳定,能够很好地解决无线中继通信系统中的功率分配问题.

In wireless communications,efficient power allocation has the advantage of reducing resource consumption,achieving better quality-of-service（QoS）,and reducing network interference.This paper is focus on the power allocation problem in wireless parallel amplify-and-forward relay transmissions.Particularly,the objective is set to minimize the transmit power of the communication nodes while guaranteeing the signal-to-noise ratio（SNR） requirement at the destination node.Firstly,based on the established channel model of wireless relay cooperative communication system,the expression of SNR is derived.Following that,the power allocation problem is modeled as a combinatorial optimization problem.Moreover,using convex optimization theory,this paper proposes a suboptimal power allocation algorithm with low complexity.The simulation results show that the method proposed in this paper is capable of resolving the power allocation problem in wireless relay communication systems with low computational complexity as well as stable performance.