Publications – Details
Iterative Source-Channel Decoding with Reduced Error Floors
- Authors:
- Laurent Schmalen and Peter Vary
- Journal:
- IEEE Journal of Selected Topics in Signal Processing
- Volume:
- 5
- Number:
- 8
- Date:
- Dec. 2011
- Pages:
- 1577–1587
- ISSN:
- 1932-4553
- URL:
- 10.1109/JSTSP.2011.2167216
- Language:
- English
Abstract
Audio-visual source encoders for digital mobile communications extract parameters that—due to delay and complexity constraints—exhibit some residual redundancy. This residual redundancy can be exploited by iterative source-channel decoding (ISCD) to improve the robustness against transmission noise by performing soft parameter detection as part of the decoding process. Systems employing ISCD at the receiving end often exhibit an observable error floor. While this error floor can be tolerated in some cases, it is often desirable to perfectly reconstruct the source codec parameters. In this paper, we explain the reasons for the error floor and propose two solutions for realizing ISCD systems with optimized error floor performance while maintaining the desired near-capacity waterfall behavior. All approaches aim at optimizing the distance properties of the (redundant) mapping of bit patterns to the source codec parameters. In some cases, especially if small quantizer code books are employed, good mappings cannot be found—in this case, the novel multi-dimensional bit mapping allows to reduce the error floor after decoding.
Download of Publication
Copyright Notice
This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder.
The following notice applies to all IEEE publications:
© IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.