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Title: Implementation strategy for single-frequency duplex radio telephone
Author: Negrat, A.
Awarding Body: University of Wales Swansea
Current Institution: Swansea University
Date of Award: 1997
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A two-way link is a very desirable requirement for conversational communications. The design of such link should account for any restraints to avoid interruption, during information exchange between two parties. In this thesis, a single carrier frequency scheme is introduced to provide a concurrent two-way communication. The system uses an analogue mode (single-frequency duplex), receiving of f1 whilst also transmitting on the same frequency. In this method, both the transmitter and receiver operate in such a manner that their signal appears to all intents and purposes simultaneously, permitting a normal two-way conversation to take place. This technique is a potential step forward towards an alternative form for point-to-point communication systems. The main contributions of this thesis are outlined below: • the concept of single-frequency duplex system has been introduced. The demonstration of this concept has been achieved by implementing a new system. • Mathematical analysis is introduced as a way of understanding the gating waveform of FM signal, and to investigate the effect of bandwidth and distortion on the quality of the signal. An FM signal with high modulation index, theoretically has infinite bandwidth; on the one hand, any band limiting will cause distortion; on the other hand, putting two FM signals next to each other in the frequency band, and not band limiting them will cause mutual interference. Gating the FM signal ON/OFF was demonstrated by experiment in this work. • A comparative study of cordless telephones world-wide was made. This study gives an overview of major system elements, and to show clear understanding of concurrent two-way communication, either of Frequency Division Duplex (FDD) or Time Division Duplex (TDD).
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available