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Optimized Bit Rate Allocation for Iterative Source-Channel Decoding and its Extension towards Multi-Mode Transmission
- Authors:
- Marc Adrat, Peter Vary, and Thorsten Clevorn
- Book Title:
- Proceedings of IST Mobile and Wireless Communications Summit
- Venue:
- Dresden, Germany
- Event Date:
- 0.-0.6.2005
- Organization:
- n.n.
- Date:
- June 2005
- Language:
- English
Abstract
Recent advancements in iterative source-channel decoding (ISCD) focus on the optimization of a single processing step of source coding (like the index assignment) or of channel coding. In this paper, we propose a new design guideline for a more general optimization of the overall ISCD scheme. In particular, we discuss how to allocate a given gross bit rate to source and channel coding.
The new bit rate allocation reveals (at least) two benefits: Firstly, the proposed ISCD scheme using a rate r* = 1 channel encoder yields improved error concealing/correcting capabilities if compared to the prior ISCD approaches. Secondly, the new scheme can easily be extended to a flexible multi-mode system. While all modes use the same r* = 1 channel code, the joint adaptation of quantizer resolution and index assignment allows to manage the trade-off between quantization noise and error robustness.
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