Use this URL to cite or link to this record in EThOS: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.494687
Title: Wavelet video compression for iterative wireless transceivers
Author: Pham, Anh Quang
ISNI:       0000 0001 3486 8914
Awarding Body: University of Southampton
Current Institution: University of Southampton
Date of Award: 2008
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Abstract:
For the sake of exploring the feasibility of providing video services for mobile users, this thesis investigates the design of wireless video communication systems using the British Broadcasting Corporation's recent proprietary wavelet-based video codec referred to as the Dirac codec. The Dirac video-encoded bitstream is subjected to a rigorous error sensitivity investigation for the scale of assisting us in contriving various joint source-channel coding (JSCC) and decoding schemes for wireless videophones. Unequal Error Protection (UEP) is an attractive technique of implementing JSCC. Based on the Dirac video codec's bit sensitivity studies, an Unequal Error Protection (UEP) scheme using turbo-equalized Irregular Convolutional Codes (IRCCs) was designed. Furthermore, an Iterative Source-Channel Decoding (ISCD) scheme, which exploits the residual redundancy left in the source encoded bitstream for the sake of improving the attainable system performance was investigated. Hence, a novel ISCD scheme employing a specific bit-to-symbol mapping scheme referred to as Over-Complete Mapping (OCM) was proposed. This allows us to design an attractive video transmission scheme having a high error resilience at a reasonable complexity and a low delay. The research reported in this thesis was concluded with the design of unequal error protection irregular over-complete mapping for wavelet video telephony using iterative source and channel decoding. The philosophy of this video telephone scheme is that we exploit as much redundancy inherent in the Dirac-encoded bitstream as possible for improving the system's BER performance, while protecting the more sensitive portions of the Dirac video-encoded sequence with a lower OCM rate. Finally, a near-instantaneous adaptive transreceiver for wireless video telephony was designed.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.494687  DOI: Not available
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