【摘要】 高速移动的Rayleigh信道会使得传输信号的频谱发生Doppler扩展。本文对存在Doppler扩展的OFDM统进行子载波干扰的理论分析,并针对高速Rayleigh信道对误码率造成的影响进行了基带仿真。仿真结果证实,相位调制OFDM系统在存在Doppler扩展的Rayleigh信道条件下的性能可以用单载波相位调制系统在慢衰落条件下的误码率理论值来近似;即使在移动台高速移动的情况下,实际中的Doppler扩展并不会使相位调制OFDM系统的误码率出现地板效应,所以相位调制OFDM系统比较适合高速移动的Rayleigh信道条件下的高速数据传输。更多还原

【Abstract】 The Doppler spread of signal spectrum could be caused by fast moving Rayleigh channel. The interference is analyzed for OFDM system over Doppler spread channel. And the BER of BPSK-OFDM system is simulated. It is concluded that the Rayleigh channel is slow fading in reality. The BER of PSK-OFDM system approximates to that of single carrier system, and there are no floor effects for the BER of PSK-OFDM system over the Doppler spread Rayleigh channel. Therefore, PSK-OFDM is suitable for the high-rate data communication over Rayleigh channel.更多还原