Received signal-level characteristics in a wide-band mobile radio channel

A mobile propagation model aimed at clarifying fundamental propagation characteristics in received signal-level variation for wide-band transmission is proposed. On the basis of this model, the author derives an expression for a received signal level in wide-band transmission and examines the fundamental signal-level characteristics by computer simulation and experiment. Both simulation and measurement results agree well and the results follow. For a received signal-level variation in wide-band transmission: first, received signal-level depth becomes shallower with increasing receiver bandwidth 2Δf, and the level has no Rayleigh distribution. In an urban area when 2Δf is 3 MHz, the level difference between the cumulative probability 50% and 1% values is about 5 dB. Second, received signal-level distribution depends on the number of arriving waves N and path length difference |ΔL _ij|. The level depth becomes shallower with increasing N and |ΔL_ij|. Third, received signal-level distribution is almost independent of radio frequency f_c. The author also derives expressions for the autocorrelation coefficient ρ(z) and frequency coefficient ρ(s) of the received signal level. ρ(z) is independent of 2Δf, and is about J₀(Z/λ_c )², which is known as narrow-band reception. The ρ(s) becomes higher with increasing 2Δf