Channel estimation based on divergence minimization for OFDM sytems with co-channel interference

Authors:
Carles Navarro Manchón;Bernard Fleury;Gunvor E. Kirkelund;Preben Mogensen;Luc Deneire;Troels B. Sørensen;Christian Rom
Affiliations:
Department of Electronic Systems, Aalborg University, Aalborg East;Department of Electronic Systems, Aalborg University, Aalborg East and Forschungszentrum Telekommunikation Wien, Vienna, Austria;Department of Electronic Systems, Aalborg University, Aalborg East;Department of Electronic Systems, Aalborg University, Aalborg East;Department of Electronic Systems, Aalborg University, Aalborg East and Université de Nice, Sophia Antipolis, France;Department of Electronic Systems, Aalborg University, Aalborg East;Infineon Technologies Denmark A/S, Aalborg, Denmark
Venue:
ICC'09 Proceedings of the 2009 IEEE international conference on Communications
Year:
2009

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Abstract

In this paper, we present a novel approach for pilot-aided channel estimation in OFDM systems with synchronous co-channel interference. The estimator is derived based on the Kullback-Leibler divergence minimization framework. The obtained solution iteratively updates both the desired user's and the interferer's channels, using a combination of linear minimum mean squared-error (LMMSE) filtering and interference cancellation, avoiding the complex matrix inversions involved in the full LMMSE channel estimation approach. Estimation of the noise variance is also included in the iterative algorithm, accounting for Gaussian noise and residual interference after each iteration. The estimates of both channels are used at the equalizer to reject the interfering signal, thus mitigating the degradation due to co-channel interference. Simulation results show that the receiver using the proposed estimator performs as good as the one employing the full LMMSE estimator and very closely to a receiver having perfect knowledge of the channel coefficients.