Abstract :
The large area characterization of the UHF mobile radio channel over the band 869¿877 MHz for three different types of environment is presented. The results, representing the variations of the statistical parameters of the frequency coherence function and power delay profile, are particular to different locations in the city of Leeds, UK. The variations of the statistical parameters, which are coherence bandwidth, average delay, delay spread, excess delay, and number of discrete paths, are shown in their cumulative probability distribution forms. The worst and typical figures of these parameters are deduced from the corresponding distributions. The resulting figures indicate the limitation on maximum data rate for an optimum system performance, the required spacing for frequency diversity schemes, and the number of paths and their corresponding time delays for hardware and software simulation of the UHF mobile radio channel. Finally, variations of the shape of the power delay profiles and frequency coherence functions and their effects on the values of their corresponding statistical parameters over different blocks of frequencies are presented.
