Exact solution for the conditional entropy of Poissonian LDPC codes over the Binary Erasure Channel
Exact solution for the conditional entropy of Poissonian LDPC codes over the Binary Erasure Channel
复制标题
二进制擦除通道上泊松LDPC码条件熵的精确解
DOI:
10.1109/isit.2007.4557357
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发表时间:
2007
期刊:
影响因子:
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通讯作者:
N. Macris
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文献类型:
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作者:
Satish Babu Korada;S. Kudekar;N. Macris
We consider communication over a binary erasure channel with low density parity check codes and optimal maximum a posteriori decoding. It is known that the problem of computing the average conditional entropy, over such code ensembles, in the asymptotic limit of large block length is closely related to computing the free energy of a mean field spin glass in the thermodynamic limit. Tentative, but explicit, formulas for these quantities have been derived thanks to the replica method (of spin glass theory) and are generally conjectured to be exact. In this contribution we show that the replica formulas are indeed exact in the case of Poissonian low density parity check ensembles. Our methods use ideas coming from the recent progress in the rigorous analysis of the Sherrington-Kirkpatrick model and their applications to the theory of error correcting codes.
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