Performance of a robust inner receiver with frequency domain LMS equalizer for DSRC systems
Proceedings of the 2006 international conference on Wireless communications and mobile computing
Channel analysis and estimation for OFDM systems with Doppler effect
ICCOM'06 Proceedings of the 10th WSEAS international conference on Communications
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In this paper we present and analyze a nonparametric channel equalizer based on the moving average estimator. Since the OFDM system can be considered as a set of parallel Gaussian channels with different frequency gain for each subcarrier, we apply the theory of sample mean to each subcarrier by averaging the consecutive data symbols. Assuming the channel attenuations and the transmitted data symbols are constant while taking averages, this effectively removes noise and we can obtain the data symbols distorted only by the multipath channel. The proposed method does not require any a priori knowledge about the channel statistics. Furthermore, it has the performance improvement over conventional schemes even for slowly time-varying channels. We evaluate the equalizer through simulation using a 16 QAM OFDM system