自适应OFDM系统的仿真研究

Simulation Research of Adaptive OFDM Sytem

OFDM(正交频分复用)是一种无线环境下的高速传输技术,适合在多径传播和多普勒频移的无线移动信道中传输高速数据。他能有效对抗多径效应,消除符号间干扰,对抗频率选择性衰落,而且信道利用率高。本文介绍了OFDM技术特点,讨论了自适应OFDM系统,并运用Matlab/Simulnk软件,对自适应OFDM系统进行了仿真。通过仿真结果的对比得出结论,在相同的信道信噪比(SNR)下,自适应的OFDM系统比传统的OFDM系统有更低的误比特率(BER)。

OFDM is a kind of high speed transmission technology in wireless communication,which is suit for wireless mobile channels with mutipath and Doppler Shift to transmit high speed data. It can effectively deal with mutipath interference,intersymbol interference,frequency selective fade,and has high channel utility. This paper introduces the characters of OFDM,and discusses the adaptive OFDM system based on traditional OFDM system,and making simulations of traditional OFDM system and adaptive OFDM system in Matlab/Simulink. By some contrasts between two simulation results ,the conclusion is that in the same SNR of channels ,the adaptive OFDM system has low BER compared to the traditional OFDM system.