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The EXIT-Characteristic of Softbit-Source Decoders

Authors:

Marc Adrat, Johannes Brauers, Thorsten Clevorn, and Peter Vary

Journal:

IEEE Communications Letters

Volume:

9

Number:

6

Date:

June 2005

Pages:

540–542

Language:

English

Abstract

We outline a new technique to compute the EXITcharacteristic of softbit-source decoders analytically without extensive histogram measurements. Based on the analytic considerations it is straightforward to derive a compact determination rule for the maximum value of attainable extrinsic information. We also show that the area under the EXIT-characteristic grows almost logarithmically with the prediction gain which is utilizable due to the residual redundancy in the source data.

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