Polynomial Estimation of Time-varying Multi-path Gains with ICI Mitigation in OFDM SystemsReport as inadecuate




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1 GIPSA-C2S - C2S GIPSA-DIS - Département Images et Signal

Abstract : In this paper, we consider the case of a high speed mobile receiver operating in an orthogonal-frequency-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 normalized Doppler spread.

Keywords : time-varying channels. channel estimation ICI SIS time-varying channels OFDM





Author: Hussein Hijazi - Laurent Ros -

Source: https://hal.archives-ouvertes.fr/



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