Design of joint network-low density parity check codes based on the EXIT charts

Authors:
Ying Li;Guanghui Song;Lili Wang
Affiliations:
State Key Lab of ISN, Xidian University, Xi'an, P. R. China;State Key Lab of ISN, Xidian University, Xi'an, P. R. China;State Key Lab of ISN, Xidian University, Xi'an, P. R. China
Venue:
IEEE Communications Letters
Year:
2009

Citing 3
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Abstract

For the multiple-access relay network where two sources communicate with one destination in the presence of one relay, a practical joint network-low density parity check code is designed to help the relay jointly re-encode the messages from both sources. A bilayer Extrinsic Information Transfer Chart is developed based on which a design methodology is proposed to iteratively improve the degree distribution of the proposed code. Simulations illustrate that the gap between the convergence threshold and the performance of the coding scheme is less than 0.6dB at BER=10-5.