A novel efficient cluster-based MLSE equalizer for satellite communication channels with M-QAM signaling

Authors:
Eleftherios Kofidis;Vassilis Dalakas;Yannis Kopsinis;Sergios Theodoridis
Affiliations:
Department of Statistics and Insurance Science, University of Piraeus, Piraeus, Greece;Department of Informatics and Telecommunications, University of Athens, Panepistimioupolis, Ilissia, Athens, Greece;Institute for Digital Communications, School of Engineering and Electronics, the University of Edinburgh, Edinburgh, UK;Department of Informatics and Telecommunications, University of Athens, Panepistimioupolis, Ilissia, Athens, Greece
Venue:
EURASIP Journal on Applied Signal Processing
Year:
2006

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Abstract

In satellites, nonlinear amplifiers used near saturation severely distort the transmitted signal and cause difficulties in its reception. Nevertheless, the nonlinearities introduced by memoryless bandpass amplifiers preserve the symmetries of the M-ary quadrature amplitude modulation (M-QAM) constellation. In this paper, a cluster-based sequence equalizer (CBSE) that takes advantage of these symmetries is presented. The proposed equalizer exhibits enhanced performance compared to other techniques, including the conventional linear transversal equalizer, Volterra equalizers, and RBF network equalizers. Moreover, this gain in performance is obtained at a substantially lower computational cost.