| EPSRC Reference: |
GR/J52761/01 |
| Title: |
MULTI-RATE SOURCE AND CHANNEL CODING; A STRATEGY FOR COMBATING CHANNEL ERRORS IN PCS |
| Principal Investigator: |
Evans, Professor B |
| Other Investigators: |
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| Researcher Co-Investigators: |
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| Project Partners: |
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| Department: |
Satellite Engineering Research |
| Organisation: |
University of Surrey |
| Scheme: |
Standard Research (Pre-FEC) |
| Starts: |
22 February 1994 |
Ends: |
21 February 1997 |
Value (£): |
122,379
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| EPSRC Research Topic Classifications: |
| Digital Signal Processing |
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Summary on Grant Application Form |
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1.Develop a multirate speech and channel coding strategy for PCS.2.Optimise low delay source and channel coders for use in (1).3. Simulating and implementing in real-time and realistic PCS channel model.4. Producing efficient inband signalling protocols for (1) and then integrating and testing the whole system in real-time. Progress:A basic channel model based on the Gilbert-Elliot channel has been used to prove the basic concept of an MR CDMA-based system. This work was published in 2 papers:1. Multirate Source and Channel Coding for Mobile Communication Systems, EUROSPEECH'93.2. Multirate Coding Strategy for Error Control in Mobile Communication Systems, IEE Colloquium.These 2 papers were based on a bit-rate system operating at 6.4 and 4.8kb/s with a gross bit-rate of 11.4kb/s. Both convolutional and RS codes were used.A Pulsed Residual Excited (PRELP) codec has been extensively reconfigured for MR operation for a four rate system in the line of the ATDMA project. The net bit-rates being 9.6, 8, 6.4 and 4.8kb/s for a target gross bit-rate of 13kb/s. Error control strategies are currently being designed for this system. The building of a CDMA simulated testbed that will be used for further experiments of the MR concept is almost complete. The simulation will enable us to evaluate capacity and power control improvements from shadowing that can be derived from MR operation. A paper on this part of the work has been submitted to the International Conference on Wireless Communications, 1995.
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Key Findings |
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This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
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Potential use in non-academic contexts |
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This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
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Impacts |
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| Description |
This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk |
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Sectors submitted by the Researcher |
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This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
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| Project URL: |
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| Further Information: |
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| Organisation Website: |
http://www.surrey.ac.uk |