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Details of Grant 

EPSRC Reference: GR/J89798/01
Principal Investigator: Beach, Professor M
Other Investigators:
Nix, Professor A
Researcher Co-Investigators:
Project Partners:
Department: Electrical and Electronic Engineering
Organisation: University of Bristol
Scheme: Standard Research (Pre-FEC)
Starts: 01 October 1994 Ends: 30 June 1997 Value (£): 168,613
EPSRC Research Topic Classifications:
RF & Microwave Technology
EPSRC Industrial Sector Classifications:
Related Grants:
Panel History:  
Summary on Grant Application Form
To provide a rigorous investigation of the suitability of frequency-hopping (FH)CDMA for use in future generation land mobile and personal communications systems by means of simulation and construction of an FH test bed. The programme of work will focus upon link quality and system capacity.Progress:The initial phase of the work has addressed the development of a wideband propagation model appropriate for FH analysis. The main focus of this work to date has been towards investigating fundamental channel parameters such as system performance in wideband fading and evaluating any data rate limitations. It is intended that the simulation tool will be used to facilitate evaluation of candidate FH air interface schemes. Furthermore, work will be undertaken to examine various aspects of the overall system, including error patterns, support of high data rates, optimum coding, and spectrum efficient multiple access. Based on the simulation results and those obtained from a simplified hardware FH modem previously constructed at Bristol, work will shortly commence on the design and construction of a flexible FH modem test bed. The modem will consist of a channel encoder, data modulator, hopping frequency synthesiser, IF up-converter and RF power amplifier at the transmitter, and a hopping frequency synthesiser, synchronisation modules, data demodulator and channel decoder at the receiver. Inclusion of vocoders to achieve a subjective measurement of the link quality is also under consideration. The system synchronisation and the acquisition and tracking of the received hopping sequence are amongst the main problems to be tackled if a successful operation is to be achieved. Various modulation formats including linear and trellis coded modulation schemes will be implemented to investigate their suitability under practical conditions. Effects of error coding and interleaving on the system performance are amongst other issues to be studied. Full on-bench and on-air tests will be performed on the completed modem in order to assess its performance under various practical conditions. Following the completion of the simplex modem construction, the implementation of a full demonstrator, including provision for investigating multi-user co-cell and co-channel interference, will be considered.
Key Findings
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Potential use in non-academic contexts
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Date Materialised
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Organisation Website: http://www.bris.ac.uk