Iterative Joint Video and Channel Decoding in a Trellis-Based Vector-Quantized Video Codec and Trellis-Coded Modulation Aided Wireless Videophone
Iterative Joint Video and Channel Decoding in a Trellis-Based Vector-Quantized Video Codec and Trellis-Coded Modulation Aided Wireless Videophone
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.
video, vector quantization, VQ, variable length coding, VLC, iterative decoding, EXIT chart, serial concatenation, joint source and channel coding, trellis, BCJR, Viterbi, MMSE, soft
922-926
Maunder, R. G.
76099323-7d58-4732-a98f-22a662ccba6c
Kliewer, J.
e500e56d-f2d2-45df-8962-56274e41a1a1
Ng, S. X.
e19a63b0-0f12-4591-ab5f-554820d5f78c
Wang, J.
53d8d8bd-3c17-406e-9acf-961cc86b9a00
Yang, L-L.
ae425648-d9a3-4b7d-8abd-b3cfea375bc7
Hanzo, L.
66e7266f-3066-4fc0-8391-e000acce71a1
25 September 2005
Maunder, R. G.
76099323-7d58-4732-a98f-22a662ccba6c
Kliewer, J.
e500e56d-f2d2-45df-8962-56274e41a1a1
Ng, S. X.
e19a63b0-0f12-4591-ab5f-554820d5f78c
Wang, J.
53d8d8bd-3c17-406e-9acf-961cc86b9a00
Yang, L-L.
ae425648-d9a3-4b7d-8abd-b3cfea375bc7
Hanzo, L.
66e7266f-3066-4fc0-8391-e000acce71a1
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.
IEEE VTC05 (Fall), Dallas, Texas, United States.
25 - 28 Sep 2005.
.
(doi:10.1109/VETECF.2005.1558060).
Record type:
Conference or Workshop Item
(Paper)
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.
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Published date: 25 September 2005
Additional Information:
Event Dates: 25-28 September 2005
Venue - Dates:
IEEE VTC05 (Fall), Dallas, Texas, United States, 2005-09-25 - 2005-09-28
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
Organisations:
Southampton Wireless Group
Identifiers
Local EPrints ID: 261669
URI: http://eprints.soton.ac.uk/id/eprint/261669
PURE UUID: 29a07b98-8e5a-47fb-952e-cba1b0f15bb1
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Date deposited: 15 Dec 2005
Last modified: 18 Mar 2024 03:09
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