保证公平的最大化中继OFDMA系统容量策略

基于正交频分多址(OFDMA)解码-转发中继的系统资源分配方法不能兼顾系统容量与用户公平度。针对该问题,提出一种新的子载波与功率资源分配算法,其中包括子载波分配与配对以及功率分配2个过程。在子载波分配与配对过程中,设计新的同步子载波差值最小配对方法,以最大程度匹配两跳链路配对的子载波。在功率分配过程中,通过拉格朗日方法调整每个子载波对的功率,进一步提高系统传输速率。仿真结果表明,将该策略运用于不同的OFDMA子载波分配算法中能够较好地兼顾系统容量与用户间公平度。

Strategy of Maximizing Relay OFDMA System Capacity Guaranteeing Fairness

Aiming at the problem that the resource allocation methods of Orthogonal Frequency Division Multiple Access(OFDMA)based Decode-Forward(DF)relay system can not take account of both system capacity and user fairness,a new subcarrier and power resource allocation algorithm is proposed.This algorithm is composed of subcarrier allocation and matching and power allocation.In the process of subcarrier allocation and matching,a new synchronous subcarrier difference minimum matching method is designed,which can match the subcarriers of two-hop link pairing to the greatest extent.In the process of power allocation,the power of each subcarrier pair is adjusted by Lagrange method to further improve the transmission rate of the system.Simulation results show that the proposed strategy can give better consideration to both system capacity and user fairness when applied to different OFDMA subcarrier allocation algorithms.