Quadtree-Decomposed Cordless Videophones
Quadtree-Decomposed Cordless Videophones
Arbitrarily programmable, but fixed-rate quad-tree (QT) decomposed, parametrically enhanced videophone codecs using quarter common intermediate format (QCIF) video sequences are proposed as a direct replacement for mobile radio voice codecs in second generation systems, such as the Pan-European GSM, the American IS-54 and IS-95 as well as the Japanese systems. The proposed 11.36 kbps Codec 1 and the 11 kbps Codec 2 are embedded in the adaptively re-configurable wireless videophone Systems 1-4 featured in Table 3 and their video quality, bit rate, robustness and complexity issues are investigated. Coherent re-configurable 16 or 4-level pilot symbol assisted quadrature amplitude modulation (PSAQAM) is used and the system's robustness is improved by a combination of diversity and Automatic Repeat Request (ARQ) techniques. When using a bandwidth of 200 kHz, as in the PanEuropean GSM mobile radio system, the number of videophone users supported varies between 3 and 16, while the minimum required channel Signal to Noise Ratio over Gaussian and Rayleigh channels is in excess of 6 and 8 dB, respectively. The salient system features are summarised in Table 3.
218-222
Streit, J.
49bf5c3e-e995-4441-ac68-7feecb6a6f1d
Hanzo, L.
66e7266f-3066-4fc0-8391-e000acce71a1
April 1996
Streit, J.
49bf5c3e-e995-4441-ac68-7feecb6a6f1d
Hanzo, L.
66e7266f-3066-4fc0-8391-e000acce71a1
Streit, J. and Hanzo, L.
(1996)
Quadtree-Decomposed Cordless Videophones.
of VTC'96, Atlanta, USA, Georgia.
28 Apr - 01 May 1996.
.
Record type:
Conference or Workshop Item
(Other)
Abstract
Arbitrarily programmable, but fixed-rate quad-tree (QT) decomposed, parametrically enhanced videophone codecs using quarter common intermediate format (QCIF) video sequences are proposed as a direct replacement for mobile radio voice codecs in second generation systems, such as the Pan-European GSM, the American IS-54 and IS-95 as well as the Japanese systems. The proposed 11.36 kbps Codec 1 and the 11 kbps Codec 2 are embedded in the adaptively re-configurable wireless videophone Systems 1-4 featured in Table 3 and their video quality, bit rate, robustness and complexity issues are investigated. Coherent re-configurable 16 or 4-level pilot symbol assisted quadrature amplitude modulation (PSAQAM) is used and the system's robustness is improved by a combination of diversity and Automatic Repeat Request (ARQ) techniques. When using a bandwidth of 200 kHz, as in the PanEuropean GSM mobile radio system, the number of videophone users supported varies between 3 and 16, while the minimum required channel Signal to Noise Ratio over Gaussian and Rayleigh channels is in excess of 6 and 8 dB, respectively. The salient system features are summarised in Table 3.
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js-lh-vtc-1996.pdf
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Published date: April 1996
Additional Information:
Event Dates: 28 April - 1 May 1996 Organisation: IEEE Address: Atlanta, Georgia, USA
Venue - Dates:
of VTC'96, Atlanta, USA, Georgia, 1996-04-28 - 1996-05-01
Organisations:
Southampton Wireless Group
Identifiers
Local EPrints ID: 258134
URI: http://eprints.soton.ac.uk/id/eprint/258134
PURE UUID: 703b5e58-1e27-438e-a011-7e6c9a00fd78
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Date deposited: 31 Jul 2003
Last modified: 18 Mar 2024 02:33
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Contributors
Author:
J. Streit
Author:
L. Hanzo
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