Turbo Source Compression with Jointly Optimized Inner Irregular and Outer Irregular Codes

Authors:

Schmalen, L. ,  Vary, P. ,  Clevorn, T. ,  Adrat, M.

Book Title:

Proceedings of IEEE Vehicular Technology Conference (VTC-Fall)

Organization:

IEEE

Address:

Ottawa, Canada

Date:

Sep. 2010

ISBN:

978-1-42443-573-9

ISSN:

1090-3038

DOI:

10.1109/VETECF.2010.5594217

Language:

English

Abstract

In this paper, we present a near-lossless compression scheme for scalar-quantized source codec parameters based on iterative source-channel decoding (ISCD). The scheme is comparable to a Turbo source coding approach and can inherently incorporate protection against transmission errors. In order to realize a close-to-capacity transmission/compression scheme, we employ irregular redundant bit mappings and irregular inner channel codes. The irregular inner code is composed of (pseudo) randomly punctured convolutional codes of rate > 1, i.e., the compression is performed by strong puncturing of the inner code. The optimization goal is a minimum number of transmitted bits given certain source and channel conditions. We show how the inner and outer component can be jointly optimized resulting in a constrained nonlinear programming problem. Simulation examples show the advantage over systems employing only a single irregular component.

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