EXIT-Optimized Quantizer Design for Iterative Source-Channel Decoding

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: 5Language: englishTyp: PDF

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Adrat, Marc; Antweiler, Markus (Research Establishment for Applied Sciences (FGAN), Dept. FKIE/KOM, Wachtberg, Germany)
Clevorn, Thorsten; Korall, Bjoern; Vary, Peter (Institute of Communication Systems and Data Processing (IND), RWTH Aachen University, Germany)

In digital mobile communications the input speech, audio, or video signal has to be quantized before transmission. In this paper, we propose a novel quantizer design strategy which is optimized for the case that iterative source-channel decoding (ISCD) is applied at the receiver site. The combination of the new quantizer with the ISCD scheme reveals a substantially increased error robustness in bad channel conditions at the cost of a tolerable loss of baseline performance in almost error-free situations. This trade-off can smoothly be adjusted.