UHF Propagation Measurements in Space Diversity (Five Channels) of Mobile Radio Channel and Combining Techniques: Criteria MSE, CMA

This paper describes the design of a space diversity microwave combiner which is used to measure different parameters of mobile radio channels and to test algorithms in diversity. The transmission equipment uses a carrier at 890.2 MHz in a 6 Watt amplifier. The receiver and measuring equipments are mounted in a mobile van. Source test measurement results are presented to study and to analyze the different problems of mobile communication in rural and suburban areas (from the viewpoint of the short term signal, the fading caused by the multipaths). After a study of the elements position on the roof van using simulation, different array geometry are tried. The received signal envelope and phase characteristics are measured and discussed. The signals correlation is analyzed. To counter the effects of multipaths fading, modulation scheme in space diversity are presented. The performance study, using experimental measures, shows improvements obtained with different algorithms (LMS, CMA) compared to reception without diversity.