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P.Cherriman, L. Hanzo
Department of Electronics and Computer Science,
Univerity of Southampton, SO17 1BJ, UK.
Tel: +44 703 593125, Fax: +44 703 593045
Email:
lh@ecs.soton.ac.uk
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Accepted for publication in IEEE transactions on Circuits and Systems for Video Technology Journal.
In order to exploit the non-uniformly distributed channel capacity over the cell area, the intelligent 7.3 kBaud programable videophone transceiver of Table ? is proposed, which is capable of exploiting the higher channel capacity of un-interfered, high channel-quality cell areas, while supporting more robust, but lower bitrate operation in more interfered areas. The system employed an enhanced H.263-compatible video codec. Since most existing wireless systems exhibit a constant bitrate, the video codec's bitrate fluctuation was smoothed by a novel adaptive packetisation algorithm, which is capable of supporting Automatic Repeat Request (ARQ) assisted operation in wireless distributive video transmissions, although in the proposed low-latency interactive videophone transceiver we refrained from using ARQ. Instead, corrupted packets are dropped by both the local and remote decoders, in order to prevent error propagation. The minimum required channel signal to interference-plus-noise ratio (SINR) was in the range of 8-28 dB for the various transmission scenarios of Table ?, while the corresponding video peak signal-to-noise ratio (PSNR) was in the range of 32-39 dB. The main system features are summarised in Table ?.
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