Details of Grant 

EPSRC Reference:	GR/K82697/01
Title:	OPTIMISATION TECHNIQUES FOR DSP-BASED SYNCHRONISERS
Principal Investigator:	Darnell, Professor M
Other Investigators:	Grayson, Dr M
Researcher Co-Investigators:
Project Partners:
Department:	Electronic and Electrical Engineering
Organisation:	University of Leeds
Scheme:	Standard Research (Pre-FEC)
Starts:	01 September 1995	Ends:	31 October 1996	Value (£):	28,383
EPSRC Research Topic Classifications:	Digital Signal Processing
EPSRC Industrial Sector Classifications:
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Panel History:
Summary on Grant Application Form
The proposed research programme follows on from the work carried out under grant GR/F29035.Having established that the DSP implementation of the parallel maximum-likelihood synchroniser is asymptotically efficient, the investigation will concentrate on the problem of synchronisation slips, where a symbol is either inserted or deleted in the received data stream. Data integrity requires that the receiver knows the precise position of the received symbols relative to each other. Therefore, a single synchronisation slip can cause all data received after the slip to be spurious. The proposed investigation will use information available within the DSP implementation of the synchroniser to predict when slips occur and these statistics will be compared with a theoretical study of slipping performance. Techniques will be developed for coalescing the information from the symbol synchroniser and word synchroniser, incorporating the slip information within the error decoder, thus allowing the receiver to automatically recover from slips in the symbol synchronisation algorithm. The programme will also develop further the initial work carried out under GF/F20935 into the optimisation of the estimator parameters. It has been demonstrated that the synchroniser memory length and weighting function should be altered in accordance with the prevailing channel conditions. The programme will develop rules which, given channel characteristics, can produce optimised estimator parameters leading to an ideal estimate of the symbol synchronisation epoch.
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Organisation Website:	http://www.leeds.ac.uk