Propagation, Feedback and Belief
Conference: TURBO - CODING - 2006 - 4th International Symposium on Turbo Codes & Related Topics; 6th International ITG-Conference on Source and Channel Coding
04/03/2006 - 04/07/2006 at Munich, Germany
Proceedings: TURBO - CODING - 2006
Pages: 6Language: englishTyp: PDF
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Authors:
Caire, Giuseppe (University of Southern California, Los Angeles, California, USA)
Shamai, Shlomo (Technion, Haifa, Israel)
Sergio Verdú (Princeton University, Princeton, New Jersey, USA)
Abstract:
We demonstrate that feedback in discrete memoryless channels has the capability of greatly lowering the block error rate of codes designed for open-loop operation. First we show how to use full feedback of the channel output to turn any capacity achieving code into a reliability-function achieving code. Second, we propose a practical embodiment based on sparse-graph codes, belief propagation, and a variation of the closed-loop iterative doping algorithm. This scheme takes advantage of any available limited-rate feedback to bootstrap good block error rate from good bit error rate.