Iterative Joint Video and Channel Decoding in a Trellis-Based Vector-Quantized Video Codec and Trellis-Coded Modulation Aided Wireless Videophone


Maunder, R. G., Kliewer, J., Ng, S. X., Wang, J., Yang, L-L. and Hanzo, L. (2005) Iterative Joint Video and Channel Decoding in a Trellis-Based Vector-Quantized Video Codec and Trellis-Coded Modulation Aided Wireless Videophone. In, IEEE VTC05 (Fall), Dallas, Texas, USA, 25 - 28 Sep 2005. IEEE, 922-926.

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Description/Abstract

We propose a Vector-Quantized (VQ) video codec that induces deliberately-introduced code constraints. The complete set of these code constraints are unambiguously described by a novel block-based modification of a symbol-based variable length coding trellis structure. This trellis is employed during VQ encoding to represent video information with a Minimum Mean Squared Error (MMSE) reconstruction. Additionally, the proposed trellis structure is employed in the video decoder to obtain a posteriori probability based MMSE estimates of the transmitted VQ tiles. Since the trellis structure unambiguously describes the code constraints induced by the video codec, its employment guarantees the automatic recovery of valid sets of VQ tiles. The proposed video codec is serially concatenated with a trellis-coded modulation scheme for transmission over a fast-fading Rayleigh fading channel. In the receiver, iterative-decoding convergence that eliminates all perceivable channel-induced video distortion is shown to be supported within 1.29 dB of the system's 2 bit/s/Hz channel-capacity limit of 3.96 dB.

Item Type: Conference or Workshop Item (Paper)
Additional Information: Event Dates: 25-28 September 2005
ISSNs: 1090-3038
Related URLs:
Keywords: video, vector quantization, VQ, variable length coding, VLC, iterative decoding, EXIT chart, serial concatenation, joint source and channel coding, trellis, BCJR, Viterbi, MMSE, soft
Divisions: Faculty of Physical Sciences and Engineering > Electronics and Computer Science > Comms, Signal Processing & Control
ePrint ID: 261669
Date Deposited: 15 Dec 2005
Last Modified: 27 Mar 2014 20:04
Publisher: IEEE
Further Information:Google Scholar
ISI Citation Count:0
URI: http://eprints.soton.ac.uk/id/eprint/261669

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