多普勒频移对预均衡OFDM系统的性能影响

刘大为; 唐友喜; 李少谦

多普勒频移对预均衡OFDM系统的性能影响

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出版历程
- 收稿日期: 2004-07-27
- 修回日期: 2004-12-10
- 刊出日期: 2006-03-19

Impact of Doppler on BER Performance in TDD Pre-equalization OFDM Systems

摘要

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。
- OFDM;预均衡;多普勒频移;信道估计;维纳预测滤波器
Abstract: The impact of Doppler on the receivers 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.

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