Two base station configuration using an adaptive array at elevated locations for microcell systems

This paper proposes a novel configuration of an elevated base station using an adoptive array for TDMA systems, which can simultaneously decrease the CCI (co-channel interference) and form a circular cell. The proposed base s tation comprises two sets of transceivers and antenna arrays, and an adapti ve beam control unit. The transceivers work in different time slots. The ci rcular cell that suppresses the interference is achieved by integrating the pattern control of the two antenna arrays. The effectiveness of the propos ed base station configuration is evaluated by field measurements using an a daptive array testbed. We confirm that the proposed base station achieves a channel capacity that is approximately 30% greater than that of a base- st ation employing an omni-directional antenna and generates an omni-zone with reduced CCI in an actual microcell system. Furthermore, we confirm by comp uter simulation that the proposed base station establishes a communicable a rea that is approximately 1.8 times larger than that of a base station empl oying an omni-directional antenna.