多小区放大转发系统基于用户公平性的分布式资源分配

摘要

Inter-cell interference is a major problem in multi-cell, full-reuse OFDMA systems, and can severely degrade the system throughput, particularly for cell-edge users. This paper considers jointly the resource allocation of power, subcarriers and time scheduling in the downlink of a multi-cell, amplified-and-forward cellular system. This paper proposes a novel, two-stage and distributed algorithm in which the allocation is performed independently in each cell, by maximizing the cell rate subject to power con-straint and user QoS. In the first stage, the joint subcarrier allocation and scheduling is conducted. In the second stage, the power control is performed. The algorithm only requires few coordination between base stations. Simulation results shows that the proposed algorithm has better performance than existing conven-tional schemes.%全频率复用的OFDMA系统中，小区间干扰严重降低了整个系统，特别是小区边缘的频谱效率。文中考虑了多小区放大转发系统下行链路的资源管理，须联合优化用户调度、载波和功率的分配，并设计了一个分布式的资源分配算法，算法基于本小区局部信息分步完成用户调度和功率控制，小区之间只需要较少的交互信息。仿真结果表明，文中算法较传统算法具有更好的系统性能。