LDPC Code-Design for the Relay Channel

Abstract

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.

Description
Journal Paper
Advisor
Degree
Type
Journal article
Keywords
relay, LDPC, decode-and-forward
Citation

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.

Has part(s)
Forms part of
Published Version
Rights
Link to license
Citable link to this page
Collections