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Title:
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LDPC Code-Design for the Relay Channel |
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Author:
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Chakrabarti, Arnab; de Baynast, Alexandre; Sabharwal, Ashutosh; Aazhang, Behnaam
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Type:
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Journal Paper |
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Keywords:
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LDPC; Relay; User-Cooperation; Coding theory |
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Citation:
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A. Chakrabarti, A. de Baynast, A. Sabharwal and B. Aazhang, "LDPC Code-Design for the Relay Channel," IEEE Journal in Selected Areas in Communication, 2006. |
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Abstract:
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We propose LDPC code designs for the half-duplex relay
channel. Our designs are derived from 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. The optimization of relay LDPC
code profiles presents unique challenges, which are met by
modifying the density evolution algorithm by introducing
additional constraints for relaying. To speed up 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 a fraction of a dB from the
achievable lower bound for decode-and-forward relaying. |
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Date Published:
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2006-02-01 |
