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Turbo source compression with jointly optimized inner irregular and outer irregular codes

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


Institute of Electrical and Electronics Engineers -IEEE-; IEEE Vehicular Technology Society -VTS-:
IEEE 72nd Vehicular Technology Conference - Fall, VTC 2010. Proceedings. Vol.2 : Ottawa, Ontario, Canada, 6 - 9 September 2010
New York, NY: IEEE, 2010
ISBN: 978-1-4244-3573-9
ISBN: 978-1-4244-3574-6
Vehicular Technology Conference (VTC Fall) <72, 2010, Ottawa>
Fraunhofer FKIE

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 encoder 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. An additional successive approximation based on linear programming is also presented. Simulation examples show the advantage over systems employin g only a single irregular component.