Results from a Long Term Propagation Measurement Campaign

This paper describes the measurement results from a unique long-term microwave propagation experiment recently completed in the United Kingdom. The experiment aimed to provide data to improve the interference models used for channel assignment to allow more efficient packing of co- channel terrestrial microwave point-to-point links. The results form a database against which link joint attenuation models can be tested and improved. The deployment of 17 fixed microwave links at frequencies between 1.4 GHz and 18 GHz was completed in February 2005 and two years of data from March 2005 to February 2007 has now been processed and analysed. This paper presents the results of this analysis, standard cumulative distributions of the path loss for each link and the joint probability distributions of multiple entry interference are given. The cumulative distributions have been plotted to emphasise both ends of the distribution from 99.99% to 0.01%. This new data is required for developing 0- 100% time models. The measured single entry distributions are compared against ITU-R predictions.