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By Hussein Hijazi and Laurent Ros


In this paper, we consider the case of a high speed mobile receiver operating in an orthogonalfrequency-division-multiplexing (OFDM) communication system. We present an iterative algorithm for estimating multi-path complex gains with inter-sub-carrier-interference (ICI) mitigation (using comb-type pilots). Each complex gain variation is approximated by a polynomial representation, within several OFDM symbols. Assuming the knowledge of delay-related information, polynomial coefficients are obtained from the time-averaged gain values, which are estimated using the LS criterion. The channel matrix is easily computed and the ICI is reduced by using successive interference suppression (SIS) during data symbol detection. The algorithm’s performance is further enhanced by an iterative procedure, performing channel estimation and ICI mitigation at each iteration. Theoretical analysis and simulation results for a Rayleigh fading channel show that the proposed algorithm has low computational complexity and good performance in the presence of high normalised Doppler spread

Year: 2008
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