中文摘要：

研究了在多径瑞利衰落环境中，多普勒频移对二进制相位调制时分双工（TDD）预均衡正交频分复用（OFDM）系统的误码率性能影响。给出了存在多普勒影响的幅度相位预均衡处理的误码率解析表达式，并进行了计算机仿真，仿真结果和理论分析相符。对于TDD预均衡OFDM系统，多普勒效应导致了信道的时变，并使预均衡处理产生误差，且随处理时延的增大，预均衡系数误差越大，由此影响了预均衡系统的性能。提出了采用维纳预测滤波器的方案以改善存在多普勒频移的预均衡OFDM系统的性能。

英文摘要：

The impact of Doppler on the receiver＇s BER performance of TDD pre-equalized OFDM systems is investigated. The analytic BPSK BER expressions of amplitude and phase pre-equalized OFDM systems in multi-path Rayleigh fading environment are given, which undergoes Doppler frequency shift. The computer simulations verify theoretical results. In TDD pre-equalization OFDM systems, the Doppler frequency shift would make channel time-variant, degrade system performance. A new structure adopting Wiener predictor filter is proposed in such systems to improve system performance greatly.