Novel dynamic phase estimator for robust ICI self-cancellation OFDM receivers

OFDM has been widely applied in current wireless local-area networks and digital video broadcasting since it is robust in frequency-selective channels. However, there still exists a crucial intercarrier-interference (ICI) problem due to the Doppler effect, local frequency drift and multipath fading, in OFDM systems. ICI self-cancellation schemes have been proposed to significantly reduce the ICI and empirically they greatly outperform the convolutional coding schemes in the IEEE 802.11 standard. However, all current ICI self-cancellation receivers are still sensitive to the phase ambiguity due to the frequency offset, the local oscillator frequency drift and the multipath reflections. Therefore, in this paper, we propose a robust ICI self-cancellation receiver with a novel dynamic phase estimation mechanism. The proposed scheme can well solve the phase ambiguity problem and the Monte Carlo simulation results show that our phase estimator can greatly reduce the bit error rates for the final symbol detection.