OFDM中继系统中能效优化的资源联合分配算法

摘要

在协作正交频分复用系统中，合理的资源分配对于提高系统性能具有重要的意义。针对中继、子载波和功率的联合分配，对最大化系统能效为目标的分配算法进行研究，提出了一个最低容量限制下的最大能效次优化资源联合分配算法(JRAA, joint resource allocation algorithm)。该算法使用冲突图表示系统资源冲突关系，根据冲突图的最大独立集结果进行资源分配。经过仿真验证，该资源分配算法实现了中继—子载波和功率的联合分配，在能效性能方面优于现有的算法。%In cooperative orthogonal frequency division multiplexing (OFDM) systems, the resource allocation rationally is significant to enhance the system performance. Aiming at maximizing the total system energy efficiency, the joint as-signment problem of relay, sub-carrier and power among users is modeled. Since the joint assignment issue subject to each user’s maximal energy efficiency under minimal capacity constraints can be modeled as a NP-hard problem, a suboptimal algorithm is proposed to solve this problem. The proposed algorithm uses the conflict graph (CG) to denote the possible resource conflict relations. Then, the resource is assigned using maximal weight independent set (MWIS) algorithm. Numerical results demonstrate that the proposed algorithm (JRAA) can improve the system energy efficiency by joint assignment of relay,sub-carrier and power.