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Time-Variant Bitrate Turbo-Coded Near-Instantaneously Adaptive OFDM-Based Interactive Videophony

Time-Variant Bitrate Turbo-Coded Near-Instantaneously Adaptive OFDM-Based Interactive Videophony
Time-Variant Bitrate Turbo-Coded Near-Instantaneously Adaptive OFDM-Based Interactive Videophony
A range of Adaptive Orthogonal Frequency Division Multiplex (AOFDM) video systems are proposed for interactive communications over wireless channels. The proposed constant target bitrate subband adaptive OFDM (CTBR-AOFDM) modems can provide a lower BER, than a corresponding conventional OFDM modem. The slightly more complex switched or Time-Variant Target Bit Rate (TVTBR) AOFDM modems can provide a balanced video quality performance, across a wider range of channel SNRs, maintaining the best video performance. Upon invoking the technique advocated - irrespective ofthechannel conditions experienced - the transceiver achieves always the best possible video quality by automatically adjusting the achievable bitrate and the associated video 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 pathloss, fast-fading, slow-fading, dispersion, etc. Furthermore, when the mobile is roaming in a hostile outdoor 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.
245-251
Hanzo, L
66e7266f-3066-4fc0-8391-e000acce71a1
Cherriman, P J
ac4b6a79-840e-4ea5-b4d0-352e0f36ae24
Keller, T
37669062-6be4-4881-b3ff-6354288f9493
Hanzo, L
66e7266f-3066-4fc0-8391-e000acce71a1
Cherriman, P J
ac4b6a79-840e-4ea5-b4d0-352e0f36ae24
Keller, T
37669062-6be4-4881-b3ff-6354288f9493

Hanzo, L, Cherriman, P J and Keller, T (2002) Time-Variant Bitrate Turbo-Coded Near-Instantaneously Adaptive OFDM-Based Interactive Videophony. Proceedings of the 4th ITG Colloquium on Source and Channel Coding. pp. 245-251 .

Record type: Conference or Workshop Item (Other)

Abstract

A range of Adaptive Orthogonal Frequency Division Multiplex (AOFDM) video systems are proposed for interactive communications over wireless channels. The proposed constant target bitrate subband adaptive OFDM (CTBR-AOFDM) modems can provide a lower BER, than a corresponding conventional OFDM modem. The slightly more complex switched or Time-Variant Target Bit Rate (TVTBR) AOFDM modems can provide a balanced video quality performance, across a wider range of channel SNRs, maintaining the best video performance. Upon invoking the technique advocated - irrespective ofthechannel conditions experienced - the transceiver achieves always the best possible video quality by automatically adjusting the achievable bitrate and the associated video 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 pathloss, fast-fading, slow-fading, dispersion, etc. Furthermore, when the mobile is roaming in a hostile outdoor 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.

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More information

Published date: January 2002
Additional Information: Address: Berlin, Germany
Venue - Dates: Proceedings of the 4th ITG Colloquium on Source and Channel Coding, 2002-01-01
Organisations: Southampton Wireless Group

Identifiers

Local EPrints ID: 256379
URI: http://eprints.soton.ac.uk/id/eprint/256379
PURE UUID: a3239d1d-331d-4856-b63f-eabd9df2b298
ORCID for L Hanzo: ORCID iD orcid.org/0000-0002-2636-5214

Catalogue record

Date deposited: 14 Mar 2002
Last modified: 20 Jul 2019 01:26

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