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LDPC Code Design for Half-Duplex Decode-and-Forward Relaying

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Title: LDPC Code Design for Half-Duplex Decode-and-Forward Relaying
Author: Chakrabarti, Arnab; de Baynast, Alexandre; Sabharwal, Ashutosh; Aazhang, Behnaam
Type: Conference Paper
Keywords: relay; LDPC; decode-and-forward
Citation: A. Chakrabarti, A. de Baynast, A. Sabharwal and B. Aazhang,"LDPC Code Design for Half-Duplex Decode-and-Forward Relaying," in Allerton Conference on Communication, Control and Computing,
Abstract: We propose LDPC code designs for the half-duplex relay channel. Our designs mimic the information theoretic random coding scheme for decode-and-forward relaying. An important advantage of our scheme is that it is built entirely of single-user codes that can be decoded by belief propagation. The optimization of relay LDPC code profiles presents unique challenges, which are met by using the density evolution algorithm with additional constraints for relaying. To speed up our optimization, we use a Gaussian approximation of density evolution that converts the infinite dimensional code profile optimization into a simple linear programming problem. The thresholds of the discovered relay code profiles are within 0.4 dB of the achievable lower bound for decode-and-forward relaying.
Date Published: 2005-09-01

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  • ECE Publications [1082 items]
    Publications by Rice University Electrical and Computer Engineering faculty and graduate students