Vector-quantised Cordless Videophone Transceivers


Streit, J and Hanzo, L (1996) Vector-quantised Cordless Videophone Transceivers. of Globecom'96, QE II Conf. Centre, London, UK, 18 - 22 Nov 1996. , 808-812.

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Description/Abstract

A variety of adaptively re-configurable wireless videophone transceivers are proposed and their video quality, bit rate, robustness and complexity issues are analysed. A suite of fixed but arbitrarily programmable low-rate, percepturall weighted vector quantised (VQ) codecs with and without run-length compression (RLC) are contrived for quarter common intermediate format (QCIF) videophone sequences. The 11.36 kbps Codec 1 is BCH(127,71,9) coded to a rate of 20.32 kbps and this arrangement is comparatively studied along with the 8 kbps Codec 2 and BCH(127,50,13) scheme, which has the same 20.32 kbps overall rate. The source-sensitivity matched Systems 1-6 characterised in Table 3 were contrived to comparatively study the range of system design options. For example, using Codec 1 in System 1 and coherent pilot symbol assisted 16-level quadrature amplitude modulation (16-PSQAM), an overall signalling rate of 9kBd was yielded. Over lower quality channels the 4QAM mode of operation had to be invoked, which required twice as many time slots to accommodate the resulting 18kBd stream. The robustness of Systems 2,3,4 and 6 was increased using Automatic Repeat Requests (ARQ), inevitably reducing the number of users supported, which was between 6 and 16. In a band-width of 200kHz, similarly to the Pan European GSM mobile radio systems's speech channel, using Systems 1, 3, 4 or 5 for example, 16 and 8 videophone users can be supported in the 16QAM and 4QAM modes, respectively. The basic system characteristics are highlighted in Table 3.

Item Type: Conference or Workshop Item (UNSPECIFIED)
Additional Information: Event Dates: 18-22 November 1996 Organisation: Globecom Address: Queen Elizabeth II Conference Centre, London
Divisions: Faculty of Physical Sciences and Engineering > Electronics and Computer Science > Comms, Signal Processing & Control
ePrint ID: 257067
Date Deposited: 11 Dec 2002
Last Modified: 27 Mar 2014 19:59
Further Information:Google Scholar
ISI Citation Count:0
URI: http://eprints.soton.ac.uk/id/eprint/257067

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