6GHz Propagation Measurements over a 51 km Path in the UK,
BRITISH TELECOM RESEARCH LABS IPSWICH (ENGLAND)
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For several years British Telecom has operated an experimental 6 GHz digital link over a 51 km path in the worst multipath environment in the UK. The aims of the experiment are to obtain detailed information on the way in which propagation effects degrade the performance of digital systems, with the ultimate aim of developing a system outage model firmly based on practical experience, and secondly to provide test facilities for the performance comparison of a variety of equipments employing different modulation systems, within a reasonably severe propagation environment. Results from this link are discussed with particular emphasis being given to a previously unreported form of cross-polar-isolation XPI behaviour in which the XPI degrades with both frequency selective and flat components of fading. Such events occur only once or twice a year in the location of the experiment but emphasis the need for the development of interference cancellers if co-frequency cross-polar frequency plans are to become viable.
- Radiofrequency Wave Propagation