Characteristics of antenna pattern diversity branches in urban mobile radio
Fumio Ikegami, Tsutomu T. Takeuchi, Susumu Yoshida · Electronics and Communications in Japan (Part I Communications) · 1988
Abstract The performance of mobile communication is greatly degraded by the multipath fading which is a large problem in future digital mobile communication. We made a detailed analysis of the urban propagation characteristics and found that use of a directive antenna in a mobile station reduces the fading by the effect of antenna pattern itself. We suggested that excellent diversity branches can be realized by combining more than one directive antenna. This paper discusses first the basic condition for the antenna pattern diversity branches. Correlation characteristics are examined by measurement of 2‐ and 4‐branches. The reduction of the fading is estimated by computer simulation based on the measured data. It is shown as a result that a 4‐branch antenna pattern diversity system has excellent characteristics compared with the space diversity system composed of omnidirectional antennas.