多用户OFDM系统中分组跳频算法及性能分析

Group Frequency Hopping Algorithm and Performance Analysis for Multi-User OFDM System

针对多用户OFDM系统,提出一种新的分组跳频算法,将多个处于深衰落子载波上的频域序列组合构成一个短OFDM帧,动态地分配到系统空闲子载波上进行传输,以解决深衰落所带来的系统性能恶化问题,同时优化系统的资源分配.仿真结果表明,这种分组跳频算法与传统算法相比,能明显改善系统的误码率性能.

In order to solve the problem of performance degradation caused by deep fading and optimize system resourec allocation, a novel group frequency hopping（FH） algorithm for multi- user orthogunal frequency-division muhiplexin g （OFDM） system is proposed. The proposed algorithm consists of frequency-domain sequences on deep fading sub-carriers of a short-OFDM frame, which is allocated dynamically to the idle sub-carriers to transmit. Simulation results indicate that the proposed algorithm has a better BER performance compared with conventional algorithms.