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LLR approximation for fading channels using a Bayesian approach

Ortega Espluga, Lorenzo and Aubault-Roudier, Marion and Poulliat, Charly and Boucheret, Marie-Laure and Al Bitar, Hanaa and Closas, Pau LLR approximation for fading channels using a Bayesian approach. (2020) IEEE Communications letters, 24 (6). 1244-1248. ISSN 1089-7798

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Official URL: https://doi.org/10.1109/LCOMM.2020.2978832

Abstract

This letter investigates on the derivation of good log likelihood ratio (LLR) approximations under uncorrelated fading channels with partial statistical channel state information (CSI) at the receiver. While previous works focused mainly on solutions exploiting full statistical CSI over the normalized Rayleigh fading channel, in this letter, a Bayesian approach based on conjugate prior analysis is proposed to derive LLR values that only uses moments of order one and two associated with the random fading coefficients. The proposed approach is shown to be a more robust method compared to the best existing approximations, since it can be performed independently of the fading channel distribution and, in most cases, at a lower complexity. Results are validated for both binary and M -ary modulations over different uncorrelated fading channels.

Item Type:Article
Additional Information:Thanks to IEEE editor. The definitive version is available at http://ieeexplore.ieee.org The original PDF can be found at IEEE Communications letters (ISSN: 1089-7798) website : https://ieeexplore.ieee.org/document/9026748 Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National d'Études Spatiales - CNES (FRANCE)
French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Other partners > Thales (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Université de Toulouse > Université Toulouse - Jean Jaurès - UT2J (FRANCE)
Université de Toulouse > Université Toulouse 1 Capitole - UT1 (FRANCE)
Other partners > Northeastern University (USA)
Laboratory name:
Funders:
NSF: National Science Foundation (US) - Association TéSA : Laboratoire de recherche coopératif des Télécommunications spatiales et aéronautiques (France)
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Deposited On:21 Sep 2020 14:22

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