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The binning/syndrome approach and the parity approach together constitute the primary methodologies for practical distributed source coding, whereas the former is known for its (proven) optimality and the latter for its operational simplicity. Since the practice of the former in an general channel code has not been popular, except low density parity check (LDPC) codes, and since a good theoretic understanding...
Iterative analysis for low-density parity-check (LDPC) codes uses the prevailing assumption that messages exchanged between the variable nodes and the check nodes follow a Gaussian distribution. However, the justification is largely pragmatic rather than being based on any rigorous theory. This paper provides a theoretic support by investigating when and how well the Gaussian distribution approximates...
Nonsystematic channel codes are superior to systematic codes in the presence of source redundancy. We study the performance of split-LDPC codes (we recently proposed), which are based on splitting redundant data bits into coded bits. We propose a novel method to build extrinsic information transfer (EXIT) chart to approximate the thresholds of such codes. EXIT charts provide a fast and close to accurate...
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