基于效用公平的多用户下行OFDM系统机会调度

Utility-Based Fairness Opportunistic Scheduling Scheme in Multiuser Downlink OFDM System

基于对单信道系统中效用公平机会调度的研究,提出了一种多用户下行OFDM多载波系统中的调度方案。该方案充分利用信道的时变和频率选择特性,由参数更新和调度决策两个模块组成:参数更新模块根据调度结果更新控制参数;调度决策模块根据所有用户的信道信息和参数更新模块输出的公平性控制参数决定该时隙每个用户使用哪些子载波。仿真结果表明,参数选取合适时,所提的简单调度方案能够在保证效用公平性的前提下,达到比复杂的Max-Min子载波分配算法更好的系统性能。

Based on the research of utility fairness opportunistic scheduling in single channel system,this paper presents a scheme to manage the parallel subcarriers in downlink orthogonal frequency division multiplexing（OFDM） system. The scheme utilizes the time varying and frequency selectivity in the wireless channels. The proposed scheme consists of a parameter updating module and a scheduling decision module. The parameter updating module updates parameters according to the scheduling results;the scheduling decision module is responsible for deciding that each user should use subcarriers ,according to the current channel state information and the output of the parameter updating module. Simulation results demonstrate that with proper parameter selection, the scheduling scheme can achieve better system performance than the complicated Max-Min subcarrier allocation algorithm under the constraint of utility fairness.