A non-stationary mobile-to-mobile multipath fading channel model taking account of velocity variations of the mobile stations

In mobile-to-mobile (M2M) communication systems, both the transmitter and the receiver mobile stations are moving with a certain velocity which is usually assumed to be constant over time. However, in realistic propagation scenarios, the mobile velocity changes continuously resulting in a non-stationary fading process. In this paper, we focus on the analysis of a non-stationary M2M multipath fading channel model, where the transmitter and the receiver may experience changes in their velocities. For the proposed model, we derive expressions for the local autocorrelation function (ACF) and the local power spectral density (PSD). By relaxing the assumption of constant velocity, our study shows that the correlation properties of the M2M fading channel are significantly affected.