Propagation, Feedback and Belief

Konferenz: TURBO - CODING - 2006 - 4th International Symposium on Turbo Codes & Related Topics; 6th International ITG-Conference on Source and Channel Coding
03.04.2006 - 07.04.2006 in Munich, Germany

Tagungsband: TURBO - CODING - 2006

Seiten: 6Sprache: EnglischTyp: PDF

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Caire, Giuseppe (University of Southern California, Los Angeles, California, USA)
Shamai, Shlomo (Technion, Haifa, Israel)
Sergio Verdú (Princeton University, Princeton, New Jersey, USA)

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.