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Bounds on the performance of belief propagation decoding

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2 Author(s)
Burshtein, D. ; Dept. of Electr. Engineering-Systems, Tel Aviv Univ., Israel ; Miller, G.

We consider Gallager's (1963) soft-decoding (belief propagation) algorithm for decoding low-density parity-check (LDPC) codes, when applied to an arbitrary binary-input symmetric-output channel. By considering the expected values of the messages, we derive both lower and upper bounds on the performance of the algorithm. We also derive various properties of the decoding algorithm, such as a certain robustness to the details of the channel noise. Our results apply both to regular and irregular LDPC codes

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Information Theory, IEEE Transactions on  (Volume:48 ,  Issue: 1 )