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      On LDPC codes for Gaussian interference channels

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      Author
      Sharifi, S.
      Tanç, A. K.
      Duman, Tolga M.
      Date
      2014
      Source Title
      Proceedings of the International Symposium on Information Theory, IEEE 2014
      Print ISSN
      2157-8095
      Publisher
      IEEE
      Pages
      1992 - 1996
      Language
      English
      Type
      Conference Paper
      Item Usage Stats
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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
      Algorithms
      Forward 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/11693/27175
      Published Version (Please cite this version)
      http://dx.doi.org/10.1109/ISIT.2014.6875182
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      • Department of Electrical and Electronics Engineering 3524
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