DocumentCode :
1676888
Title :
Hybrid digital analog transform coding
Author :
Rungeler, Matthias ; Vary, Peter
Author_Institution :
Inst. of Commun. Syst. & Data Process., RWTH Aachen Univ., Aachen, Germany
fYear :
2013
Firstpage :
5109
Lastpage :
5113
Abstract :
One problem of conventional digital transmission systems is that the transmission fidelity always saturates at the design channel quality (worst-case channel condition); this saturation is due to the irreversible quantization error introduced by the source coder. Hybrid digital analog (HDA) codes address this problem by additionally transmitting the inherent quantization error by pseudo-analog methods. However, the design and the decoding of these HDA codes is complex or even impossible for long block lengths (look-up table decoding). In this study we propose an HDA transmission system for sources with correlation supporting long block lengths. This is achieved by combining transform coding with HDA transmission using well-known digital channel codes. For the evaluation Monte Carlo simulations are used with a normalized discrete cosine transform (DCTN) and Turbo codes as the digital part and LMMSE estimation in the pseudo-analog part of the HDA system. The proposed HDA system with transform coding outperforms the purely digital transmission system at all channel qualities and exploits the expected gain due to source correlation.
Keywords :
Monte Carlo methods; decoding; discrete cosine transforms; quantisation (signal); table lookup; transform coding; turbo codes; DCTN; HDA codes; HDA system; HDA transmission; LMMSE estimation; Monte Carlo simulations; Turbo codes; conventional digital transmission systems; design channel quality; digital channel codes; discrete cosine transform; hybrid digital analog transform coding; inherent quantization error; irreversible quantization error; long block lengths; look-up table decoding; pseudo-analog methods; pseudo-analog part; source coder; transmission fidelity; worst-case channel condition; Correlation; Decoding; Digital systems; Quantization (signal); Transform coding; Transforms; Vectors; Hybrid Digital Analog (HDA); LMMSE estimator; Turbo code; transform coding;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Acoustics, Speech and Signal Processing (ICASSP), 2013 IEEE International Conference on
Conference_Location :
Vancouver, BC
ISSN :
1520-6149
Type :
conf
DOI :
10.1109/ICASSP.2013.6638635
Filename :
6638635
Link To Document :
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