Network-coded SIR-based relay selection for multiple-relay TWRC

Slim Chaoui ()
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Slim Chaoui: University of Carthage

Telecommunication Systems: Modelling, Analysis, Design and Management, 2016, vol. 63, issue 4, No 7, 579-591

Abstract: Abstract This paper considers a two-way relay channel (TWRC) that operates in a multiple-relay context with network-coded soft information relaying. During the relaying process, the log likelihood ratio sequence resulting from the network coding of the two soft-in soft-out decoders output sequences is supplied to a soft encoder. In order to mitigate the error-propagation due to the erroneous decoding at the relay, a method is proposed for modelling the soft estimated symbols at the output of the soft encoder which is mathematically convenient to work with. The signal-to-noise ratios of the equivalent one-hop channels towards each end-node are derived. Accordingly, the study proposes two relay selection (RS) schemes based on the network-coded soft information relaying, a sub-optimal Max–Min-based single RS scheme, and a double-side RS scheme. Closed-form expressions for the bit error rate performances and asymptotic pairwise error probabilities of the multiple-relay TWRC with the proposed RS schemes are derived. Monte-Carlo simulations are carried out to verify the accuracy of the analytical results.

Keywords: Network coding; Decode and forward; Error-propagation; Soft information relaying; Relay selection (search for similar items in EconPapers)
Date: 2016
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DOI: 10.1007/s11235-016-0143-9

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