一种新型的多用户OFDM系统资源分配策略

A Novel Resource Allocation Algorithm in Multiuser OFDM System

在多用户正交频分复用(Orthogonal Frequency Division Multiplexing,OFDM)系统中,系统容量和用户公平性不能同时兼顾,本文提出了一种综合考虑系统容量和用户公平性的资源分配算法.该算法利用多用户的分集增益,根据用户的实时信道状态和传输速率要求,合理的选择用户接入的时刻,既保证了用户公平性又提高了系统容量,达到时频二维空间优化系统的效果.仿真结果表明,本算法在不增加算法复杂度和不损失用户公平性的前提下,有效的提高了系统容量.

In the multiuser orthogonal frequency division multiplexing（ OFDM） system, system capacity and fairness can not be simultaneously achieved in general. A novel resource allocation algorithm, which jointly considers the system capacity and fairhess,is proposed in this paper.Based on each user＇s real-time channel state information（ CSI）and required data rate, the proposed algorithm makes full use of multiuser diversity to maximize the system capacity and guarantee the fairness by choosing suitable access time, and achieved the purpose of optimizing system in both time and frequency domains. Simulation results indicate that the proposed algorithm can effectively increase the system capacity without increasing the algorithm complexity and losing the fairness among users.