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Turbo- and BCH-Coded Wide-Band Burst-by-Burst Adaptive H.263-Assisted Wireless Video Telephony

Cherriman, P.J., Wong, C.H. and Hanzo, L. (2000) Turbo- and BCH-Coded Wide-Band Burst-by-Burst Adaptive H.263-Assisted Wireless Video Telephony IEEE Transactions on Circuits and Systems for Video Technology, 10, (8), pp. 1355-1363.

Record type: Article


The video performance benefits of burst-by-burst adaptive modulation are studied, employing a higher-order modulation scheme when the channel is favorable, in order to increase the system’s bits per symbol capacity and conversely, invoking a more robust lower order modulation scheme when the channel exhibits inferior channel quality. It is shown that due to the proposed adaptive modem mode switching regime, a seamless video-quality versus channel quality relationship can be established, resulting in error-free video quality right across the operating channel signal-to-noise ratio (SNR) range. The main advantage of the proposed burst-by-burst adaptive transceiver technique is that irrespective of the prevailing channel conditions, the transceiver achieves always the best possible source-signal representation quality--such as video, speech, or audio quality--by automatically adjusting the achievable bitrate and the associated multimedia source-signal representation quality in order to match the channel quality experienced. This is achieved on a near-instantaneous basis under given propagation conditions in order to cater for the effects of path loss, fast-fading, slow-fading, dispersion, co-channel interference, etc. Furthermore, when the mobile is roaming in a hostile out-doors—or even hilly terrain—propagation environment, typically low-order low-rate modem modes are invoked, while in benign indoor environments, predominantly the high-rate high source-signal representation quality modes are employed. Index Terms—AQAM, burst-by-burst adaptive modems, H.263, modulation, video telephony, wireless video.

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Published date: December 2000
Organisations: Southampton Wireless Group


Local EPrints ID: 254455
PURE UUID: 151f7d86-31b4-4aec-a63e-c9d171207b6b

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Date deposited: 12 Jan 2004
Last modified: 18 Jul 2017 09:52

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Author: P.J. Cherriman
Author: C.H. Wong
Author: L. Hanzo

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