The growing interest in wireless communications leads to take into account new techniques for capacity enhancement and quality improvement in multipath propagation environments. Smart antennas, are able to increase the capacity by rejecting co-channel interference, and to combat the intersymbol interference by reducing incorrelated multipath contributions. Here, we describe a software simulation system of smart antennas for base stations. Two topics have been considered: the operation of the adaptive array configuration, and the characterization of the indoor mobile radio channel with ray launching techniques.