Automatic selection of fixed receiving stations in mobile radio systems

In mobile radio systems, especially in urban mobile service, one fixed transmitting station is located at the center part of the area, while several fixed receiving stations are installed at different location. In such systems the receiving station with the highest signal-to-noise ratio should be selected at all times. This paper presents two methods to select the best receiving station. One is an analog processed switching system. The other is a digital processed system. The design objectives, circuit diagrams and characteristics are described in detail. The performance of these two systems were compared in a field test. It became clear that there were no essential differences in the performance. The analog system was adopted in the actual mobile system taking into consideration the advantage in cost.