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In this paper, two-user Gaussian interference channel(GIC) is revisited withthe objective of developing implementable (explicit) channel codes.Specifically, low density parity check (LDPC) codes are adopted for use overthese channels, and their benefits are studied. Different scenarios on thelevel of interference are considered. In particular, for strong interferencechannel examples with binary phase shift keying (BPSK), it is demonstrated thatrates better than those offered by single user codes with time sharing areachievable. Promising results are also observed with quadrature-shift-keying(QPSK). Under general interference a Han-Kobayashi coding based scheme isemployed splitting the information into public and private parts, and utilizingappropriate iterative decoders at the receivers. Using QPSK modulation at thetwo transmitters, it is shown that rate points higher than those achievable bytime sharing are obtained.

On the Performance of Low Density Parity Check Codes for Gaussian Interference Channels