Sensitivity of Low Density Parity Check Codes to Decoding Assumptions

David J C MacKay and C P Hesketh

Gallager's low density parity check codes give excellent performance when decoded by an iterative probabilistic decoding method known as belief propagation. In this paper we investigate how the performance of these codes is affected if the assumed noise level does not match the actual noise level.

postscript (Cambridge UK).

postscript (Canada mirror).

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