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OFDM具有高频谱利用率和抗多径衰落的优点,已被公认为第三代移动通信系统长期演进标准以及第四代移动通信系统的核心技术。OFDMA是基于OFDM的一种多用户接入技术,在OFDMA系统中,各用户在不同的子载波上同时传输数据。主要研究了OFDMA系统中的跨层资源分配算法。详细分析了保证速率比例公平的非实时业务跨层资源分配算法,仿真结果说明该算法能够较好地保证用户之间的公平性,并能够获得较大的系统吞吐量和较小的业务延时。
OFDM has the advantages of high spectrum efficiency and anti-multipath fading. It has been recognized as the third generation mobile communication system long-term evolution standard and the core technology of the fourth generation mobile communication system. OFDMA is a multi-user access technology based on OFDM. In an OFDMA system, each user transmits data simultaneously on different subcarriers. Mainly studied cross-layer resource allocation algorithm in OFDMA system. The cross-layer resource allocation algorithm for non-real-time services with fair proportion of guaranteed rates is analyzed in detail. The simulation results show that the algorithm can better ensure the fairness between users and obtain larger system throughput and smaller service delay .