Zolghadr, Farshid (1989) Embedded coding algorithms applicable to time variable channels. PhD thesis, University of Warwick.

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Abstract

This thesis investigates new design and implementation techniques applicable to modern communication systems operating over time variable channels. Three areas of interest are investigated. These include, source coding in conjunction with real-time channel evaluation, channel coding and modem design.
An investigation of source coding methods has led to the development of a new embedded real time channel evaluation, based on statistical techniques. The performance of this technique is examined using simulation techniques for channels with and without memory.
Existing channel coding schemes applicable to time variable channels have been examined. This led to the formulation of a new coding technique, termed embedded encoding. Two implementations of such codes, embedded array codes and embedded convolutional codes, were developed. The theoretical and practical performance of these codes has been investigated.
The final area of investigation has been the development of a 4-tone multi-frequency shift keying modem. In keeping with the intention of totally digital system design, the demodulator has been im­plemented on a single digital signal processing card. The demodulation method developed employs an embedded synchronisation technique, termed Code-Assisted Bit Synchronisation.
The demodulator performs symbol synchronisation by utilising the convolutional code used for the purpose of channel coding. It thus performs the combined functions of the demodulator, decoder and symbol timing recovery, which are normally found as separate sub­systems. In combining these subsystems a more efficient modem has been developed.

Item Type:	Thesis (PhD)
Subjects:	T Technology > TK Electrical engineering. Electronics Nuclear engineering
Library of Congress Subject Headings (LCSH):	Telecommunication systems, Communication and technology, Signal processing, Information theory, Coding theory, Signal theory (Telecommunication), Digital communications
Official Date:	November 1989
Dates:	Date Event November 1989 Submitted
Institution:	University of Warwick
Theses Department:	Department of Engineering
Thesis Type:	PhD
Publication Status:	Unpublished
Supervisor(s)/Advisor:	Honary, Bahram
Extent:	xiv, 208 leaves: illuistrations
Language:	eng

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