Linear MMSE estimation of time-frequency variant channels for MIMO-OFDM systems

Authors:
Pierluigi Salvo Rossi;Ralf R. MüLler;Ove Edfors
Affiliations:
Department of Information Engineering, Second University of Naples, Via Roma 29, 81031 Aversa (CE), Italy;Department of Electronics and Telecommunications, Norwegian University of Science and Technology, O.S. Bragstads plass 2B, 7491 Trondheim, Norway;Department of Electrical and Information Technology, Lund University, O. Römers väg 3, 223 63 Lund, Sweden
Venue:
Signal Processing
Year:
2011

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Abstract

This paper proposes two low-complexity two-dimensional channel estimators for MIMO-OFDM systems derived from a joint time-frequency channel estimator. The estimators exploit both time and frequency correlations of the wireless channel via use of Slepian-basis expansions. The computational saving comes from replacing a two-dimensional Slepian-basis expansion with two serially concatenated one-dimensional Slepian-basis expansions. Performance in terms of normalized mean square error (NMSE) vs. signal-to-noise ratio (SNR) is analyzed via numerical simulations and compared with the original estimator. The analysis of the performance takes into account the impact of both system and channel parameters. The estimators are finally tested when used within the loop of an iterative receiver for MIMO-OFDM systems.