Impulse response modeling of radio channels using a harmonic decomposition technique

In mobile communications the signal received by a moving vehicle is usually strongly affected by the surrounding environment. Based on a harmonic decomposition of stochastic processes, a new approach for approximating the time variant radio channel impulse response, given an arbitrary Doppler power density spectrum is presented. The basic idea is to use a Fourier expansion with uncorrelated coefficients to approximate the actual radio fading process. An upper bound on the mean square error between the actual and approximated fading as a function of the number of terms in the expansion is also given. The proposed method is particularly adequate for the simulation of broadband radio channels