OFDM系统中的子载波分配策略

Subcarrier Allocation Scheme for OFDM-based Systems

正交频分复用(OFDM)技术是未来宽带无线通信中最流行的技术之一。研究了适用于多用户(OFDM)系统中的多业务间子载波自适应资源分配机制。考虑了每个用的不同业务需求,资源根据每个用户不同的服务质量要求来分配。提出了基于OFDM系统的自适应子载波重分配算法,该算法能够最大程度地灵活分配所有子载波。仿真表明,使用此算法能在很大程度上改善OFDM系统的性能。

Orthogonal frequency division multiplex （OFDM） is currently one of the most popular techniques for future broadband wireless communications.In this paper,we study the adaptive resource allocation for OFDM-based systems in a multi-user and multi-service scenario.The different types of service models for each user are considered,and the resources are adaptively allocated according to the different quality-of-service （QoS） requirement of each user.Furthermore,we propose an adaptive subcarrier re-allocation algorithm for the OFDM-based system.The algorithm could allocate all subcarriers flexibly by the greatest extent.Simulation results show that with the proposed algorithm,the performance of the OFDM-based multi-user and multi-service systems improves greatly.