Frame synchronisation of differentially encoded binary and quaternary PSK digital communications systems
Frame synchronisation of differentially encoded binary and quaternary PSK digital communications systems
In this thesis a frame synchronisation system is proposed and studied for binary and quaternary differential PSK modulation schemes. A frame synchronisation algorithm has been proposed as well as optimum Frame Alignment Words (FAWs) for use by the algorithm.
The Rural Telecommunication Network, that is being developed jointly by the Universities of Southampton, Warwick and Dar-Es-Salaam, aims to provide low cost tele-communications to sparsely populated areas. It is based on intelligent nodes that use packet radio to establish synchronous conversation channels with neighbouring nodes. Frame synchronisation for the conversation channel is studied in this thesis.
The RTN poses the constraints of fast and robust frame synchronisation using a FAW of 4 bits in π/4-QPSK. The above constraints pose severe demands on conventional frame synchronisation systems that use one FAW. The author proposes a frame synchronisation system that uses two FAWs that provide the required performance with the required reduced overhead. This system uses an initial long FAW for the acquisition of frame synchronisation at call set-up, and then, uses a short 4 bit FAW for maintaining synchronisation. The long FAW is also transmitted during silence frames for acquiring synchronisation in case of loss during a call, the effect of which has been studied.
Apart from the algorithm frame synchronisation also requires optimum FAWs for the modulation scheme. This thesis describes a method for deriving optimum FAWs for use in systems with differentially encoded PSK modulation schemes. In particular optimum FAWs have been found for DEBPSK, DBPSK and π/4-QPSK for use in frame synchronisation systems.
University of Southampton
Christodoulides, Loizos M
1997
Christodoulides, Loizos M
Christodoulides, Loizos M
(1997)
Frame synchronisation of differentially encoded binary and quaternary PSK digital communications systems.
University of Southampton, Doctoral Thesis.
Record type:
Thesis
(Doctoral)
Abstract
In this thesis a frame synchronisation system is proposed and studied for binary and quaternary differential PSK modulation schemes. A frame synchronisation algorithm has been proposed as well as optimum Frame Alignment Words (FAWs) for use by the algorithm.
The Rural Telecommunication Network, that is being developed jointly by the Universities of Southampton, Warwick and Dar-Es-Salaam, aims to provide low cost tele-communications to sparsely populated areas. It is based on intelligent nodes that use packet radio to establish synchronous conversation channels with neighbouring nodes. Frame synchronisation for the conversation channel is studied in this thesis.
The RTN poses the constraints of fast and robust frame synchronisation using a FAW of 4 bits in π/4-QPSK. The above constraints pose severe demands on conventional frame synchronisation systems that use one FAW. The author proposes a frame synchronisation system that uses two FAWs that provide the required performance with the required reduced overhead. This system uses an initial long FAW for the acquisition of frame synchronisation at call set-up, and then, uses a short 4 bit FAW for maintaining synchronisation. The long FAW is also transmitted during silence frames for acquiring synchronisation in case of loss during a call, the effect of which has been studied.
Apart from the algorithm frame synchronisation also requires optimum FAWs for the modulation scheme. This thesis describes a method for deriving optimum FAWs for use in systems with differentially encoded PSK modulation schemes. In particular optimum FAWs have been found for DEBPSK, DBPSK and π/4-QPSK for use in frame synchronisation systems.
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Published date: 1997
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Local EPrints ID: 463049
URI: http://eprints.soton.ac.uk/id/eprint/463049
PURE UUID: 79e88595-7e9b-4df8-a13d-416faa8f3dd0
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Date deposited: 04 Jul 2022 20:41
Last modified: 04 Jul 2022 20:41
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Author:
Loizos M Christodoulides
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