The impact of timing error on the receiver's BER performance of TDD phase pre-equalized OFDM systems is investigated.The analytic BPSK BER expressions of ideally and nonideally pre-equalized OFDM systems in multi-path Rayleigh fading environments are obtained.The corresponding simulations verify the analytic expressions.Compared with the theoretical system performance bound of Rayleigh fading

the performances of ideal and nonideal pre-equalization entail loss of 1dB and 3dB respectively

when the normalized timing error is 1/8.When it is 1/4

both of the two systems' performances degrade severely.At the same time

the gap between them diminishes.In that case

timing error becomes dominant among those elements which would affect systems performance.