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Sharp Bounds on Generalized EXIT Functions

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1 Author(s)
Macris, N. ; Ecole Polytechnique Federale de Lausanne, Lausanne

We consider communication over binary-input memoryless symmetric channels with low-density parity-check (LDPC) codes. The relationship between maximum a posteriori and belief propagation decoding is investigated using a set of correlation inequalities that first appeared in statistical mechanics of Gaussian spin glasses. We prove bounds on generalized extrinsic information transfer (EXIT) functions, that are believed to be tight, and discuss their relationship with the ones obtained by the interpolation method.

Published in:

Information Theory, IEEE Transactions on  (Volume:53 ,  Issue: 7 )

Date of Publication:

July 2007

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