中文说明：该MATLAB程序可用于模拟OFDM系统中ISI随保护间隔长度变化的影响。研究了在多径瑞利衰落信道中，在AWGN存在下，采用64点FFT、16个虚载波的OFDM系统对16-QAM信令的误码率性能。
English Description：
This MATLAB program can be used to simulate the effect of ISI in OFDM system as the length of a guard interval varies. It considers the BER performance of an OFDM system with 64-point FFT, 16 virtual carriers , for 16-QAM signaling in the presence of AWGN for a multipath Rayleigh fading channel.