| EPSRC Reference: |
GR/J16268/01 |
| Title: |
ANTENNA SECTORISATION AND DIVERSITY TECHNIQUES FOR MICROWAVE AND MILLIMETRE-WAVE COMMUNICATIONS. |
| Principal Investigator: |
Robertson, Professor I |
| Other Investigators: |
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| Project Partners: |
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| Department: |
Electronic Engineering |
| Organisation: |
Kings College London |
| Scheme: |
Standard Research (Pre-FEC) |
| Starts: |
01 January 1994 |
Ends: |
31 December 1996 |
Value (£): |
108,455
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| EPSRC Research Topic Classifications: |
| RF & Microwave Technology |
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Summary on Grant Application Form |
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The aim of this research programme is to investigate advanced concepts in diversity and sectored antennas, for applications in microwave and millimetre-wave communications. Antenna sectorisation and space diversity is found to be of vital importance in overcoming the propagation problems caused by ray-like propagation and high attenuation by intervening media. The techniques are being investigated using new simulation techniques able to incorporate multiple and sectored antennas, along with practical measurements and the construction of a sectored antenna demonstrator.Progress:1) Indoor radio channel characterisation has been carried out using a ray tracing model. Through the study, the RMS delay spread has been investigated as a function of the number of sectors as well as the directivity of the antenna.2) Indoor propagation measurements have been performed at 60 GHz to provide verification data for the ray tracing modelling.3) Using system-level computer simulation, sectored antennas using MMIC technology have been investigated as a solution to the multipath problem. We have shown that the optimum combiner is an ideal technique to combat these problems without sacrifice of bandwidth and that it can cope with local scattering and short phase delay. In order to make the optimum combiner practical, we investigated a method of generating the reference signal. With a proposed system of 4 sectors with an optimum combiner, only 15.9 dBm Tx power is required to reach the minimum 30 Mbps data rate at 10-4 uncoded BER in 100 ft office (30 ns rms delay).4) For the sectored antenna demonstrator, the MMIC RF unit is under development. The transceiver is being designed in two different schemes; single and double conversion. The LNA, oscillator, BPF, mixers and power amplifiers have already been designed on the computer and are now being integrated together ready for fabrication through GEC-Marconi. The demonstrator is targeted at 17 GHz, which is proposed for HIPERLAN (European standards for Highs Performance Radio LAN)Publications so far:2 papers at an IEE Colloquium on Smart Antennas. One at the IEE International Conference on Telecommunications.
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Potential use in non-academic contexts |
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Impacts |
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| Description |
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Sectors submitted by the Researcher |
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