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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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relay; LDPC; decode-and-forward |
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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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2006-06-01 |
