Joint optimization of VQ codebooks and QAM signal constellations for AWGN channels

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A joint design scheme has been proposed to optimize the source encoder and the modulation signal constellation based on the minimization of the end-to-end distortion including both the quantization error and channel distortion. The proposed scheme first optimizes the vector quantization (VQ) codebook for a fixed modulation signal set, and then the modulation signals for the fixed VQ codebook, These two steps are iteratively repeated until they reach a local optimum solution, It has been shown that the performance of the proposed system fan be enhanced by employing a new efficient mapping scheme between codevectors and modulation signals. Simulation results show that a jointly optimized system based on the proposed algorithms outperforms the conventional system based on a conventional quadrature amplitude modulation signal set and the VQ codebook designed for a noiseless channel.
Publisher
Institute of Electrical and Electronics Engineers
Issue Date
2001-05
Language
English
Article Type
Article
Keywords

VECTOR QUANTIZATION; NOISY CHANNELS; DESIGN

Citation

IEEE TRANSACTIONS ON COMMUNICATIONS, v.49, no.5, pp.816 - 825

ISSN
0090-6778
URI
http://hdl.handle.net/10203/12354
Appears in Collection
EE-Journal Papers(저널논문)
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