协作通信系统中能效优化的中继分配算法

Relay Assignment Algorithm Based on Energy Efficiency Optimization in Cooperative Communication Systems

在协作通信系统中,中继节点的合理分配对于系统性能提升具有重要的意义。然而,现有的方法往往只从系统容量最大化或者功率最小化单方面研究中继节点分配,缺乏对两者的综合考虑以致最终的中继分配结果不是最优。通过对基于能效(容量/发送功率)的中继分配进行研究,提出一种能效最大化为目标的中继分配算法(EERAA)。该算法首先优化各协作链路能效,然后通过最大权重匹配方法为各源移动终端进行中继节点的分配,从而有效地提高系统能效。经仿真验证,该算法跟现有的算法相比,能得到更高的系统能效。

In cooperative communications systems, allocating relay rationally is significant to promote the performance. However, the existing relay assignment methods only trend to maximize the capacity or the minimum transmission power, lack the comprehensive consideration of both capacity and transmission power so that the result of assignment is not the optimal. A relay allocation algorithm, called energy efficiency aware relay assignment algorithm （EERAA）, is proposed with the objective of maximizing energy efficiency （ratio of capacity and transmission power）. Firstly, EERAA algorithm optimizes the energy efficiency of collaboration link. Then, according to the result of maximum weight matching method. The base station allocates the optimal relay to source node, or source node communicating with base station directly. The simulation results verify that the energy efficiency of the proposed algorithm achieves a significant improvement compared with the existing methods.