Polymer Expansions for Cycle LDPC Codes

Details Polymer Expansions for Cycle LDPC Codes Polymer Expansions for Cycle LDPC Codes

2012-02-13

arxiv.org/abs/1202.2778v1

Computer Science

Information Theory

Scientific paper

We prove that the Bethe expression for the conditional input-output entropy of cycle LDPC codes on binary symmetric channels above the MAP threshold is exact in the large block length limit. The analysis relies on methods from statistical physics. The finite size corrections to the Bethe expression are expressed through a polymer expansion which is controlled thanks to expander and counting arguments.

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