Iterative Source-Channel Decoding: Design of Redundant Index Assignments

Konferenz: Sprachkommunikation 2008 - 8. ITG-Fachtagung
08.10.2008 - 10.10.2008 in Aachen, Germany

Tagungsband: Sprachkommunikation 2008

Seiten: 4Sprache: EnglischTyp: PDF

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Clevorn, Thorsten (COM Development Center NRW, Infineon Technologies AG, 47259 Duisburg, Germany)
Schmalen, Laurent; Vary, Peter (Institute for Communication Systems and Data Processing (IND), RWTH Aachen, 52056 Aachen, Germany)
Adrat, Marc (FKIE/KOM, Research Establishment for Applied Science (FGAN), 53343 Wachtberg, Germany)

The exploitation of the residual redundancy of source codec parameters by using the Turbo principle is known as iterative source-channel decoding (ISCD). The concept of redundant index assignments was proposed as a powerful improvement for ISCD. In this contribution design and optimization guidelines for such redundant index assignments are presented. Commonly, the redundant index assignment is based on a simple block code. Using extrinsic information transfer (EXIT) chart we demonstrate that weak block codes such as a repetition code should be preferred. Simulation results show significant performance improvements with redundant index assignments based on this guideline.