Effects of Rician Faded and Log-Normal Shadowed Signals on Spectrum Efficiency in Microcellular Radio

An assessment of spectrum efficiency for a microcellular land mobile radio system is presented by considering the desired signal as (fast) Rician fading with (slow) lognormal shadowing and co-channel interfering signals as uncorrelated (fast) Rayleigh fading superimposed over (slow) lognormal shadowing. Spectrum efficiency is defined in terms of reuse distance, Le., cluster size, traffic intensity, bandwidth of the system, and area of a cell by considering co-channel interference probability. The expression for co-channel interference probability is derived using appropriate path-loss law for microcells for four different cases, viz.: i) Rician plus lognormal desired signal and Rayleigh plus lognormal interfering signals; ii) Rician desired signal and Rayleigh fading plus log-nornial shadowing interfering signals; iii) Rician desired signal and Rayleigh interfering signals; and iv) both desired and interfering signals as Rician fading. Finally, the performance of a microcellular system is compared with that of a conventional macrocellular system.