SUMMARYAssuming the PHS channel, the transmission characteristics of a system in which adaptive arrays are installed only at the base stations are studied. In order to handle co-channel interference and fading at the same time, the effect of the adaptive array is studied when the antenna element spacing is increased. A computer simulation shows that the bit error rate is improved because a sufficient space diversity effect is obtained and the interference suppression characteristics are not degraded. Improvement of the characteristics is achieved when the weights determined in the uplink are used in the downlink.

Adaptive array antenna is receiving attention because it can suppress interference waves coming from other cells. In this paper, we investigate performance of adaptive array antenna with widely spaced antenna elements. We show that at a base station the adaptive array antenna with wide element spacing has better bit error rate performance due to space diversity effect than the one with narrow element spacing under co-channel interference and multi-path fading environment.