On LDPC codes for Gaussian interference channels
Author
Sharifi, S.
Tanç, A. K.
Duman, Tolga M.
Date
2014Source Title
Proceedings of the International Symposium on Information Theory, IEEE 2014
Print ISSN
2157-8095
Publisher
IEEE
Pages
1992 - 1996
Language
English
Type
Conference PaperItem Usage Stats
142
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111
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Abstract
In this paper, we focus on the two-user Gaussian interference channel (GIC), and study the Han-Kobayashi (HK) coding/decoding strategy with the objective of designing low-density parity-check (LDPC) codes. A code optimization algorithm is proposed which adopts a random perturbation technique via tracking the average mutual information. The degree distribution optimization and convergence threshold computation are carried out for strong and weak interference channels, employing binary phase-shift keying (BPSK). Under strong interference, it is observed that optimized codes operate close to the capacity boundary. For the case of weak interference, it is shown that via the newly designed codes, a nontrivial rate pair is achievable, which is not attainable by single user codes with time-sharing. Performance of the designed LDPC codes are also studied for finite block lengths through simulations of specific codes picked from the optimized degree distributions.
Keywords
AlgorithmsForward error correction
Optimization
Random processes
Signal interference
Average mutual information
Code optimization
Degree distributions
Finite block length
Gaussian interference channels
Interference channels
Low-density parity-check (LDPC) codes
Strong interference
Codes (symbols)
Permalink
http://hdl.handle.net/11693/27175Published Version (Please cite this version)
http://dx.doi.org/10.1109/ISIT.2014.6875182Collections
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