Performance Analysis of Cellular Mobile Communications under Multipath Interference

In a radio communication environment, no matter whether signal is transmitted outdoors or indoors, the phenomenon of multipath interference is unavoidable. Therefore, it is necessary for us to thoroughly study the effect of multipath interference on cellular mobile systems. In this paper, we first investigate the effect of multipath interference on the performance of a single cell system with finite users. In order to use the Markov chain method, a system model with 2-dimensional state vector is presented. With his model, the system performance under multipath interference has been successfully derived. Next, an extended-slot method to reduce the multipath interference triggered by LOS packets occurring in the previous slot is proposed. Numerical results show that this method can remarkably enhance the system performance. Finally, we further analyze the combined effect of co-channel interference and multipath interference on the performance of multicell systems. Numerical results show that the system performance suffers some degradation compared to the single cell environment. However, the degradation under typical environments with path-loss exponent around 4 is insignificant.