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| Impact of Doppler on BER Performance in TDD Pre-equalization OFDM Systems |
| Liu Da-wei; Tang You-xi; Li Shao-qian |
| National Key Laboratory of Communication, UEST of China, Chengdu 610054, China |
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Abstract 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.
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Received: 27 July 2004
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2006, Vol. 28 
