Two Base Station Configuration Using an Adaptive Array at Elevated Locations for Microcell Systems

Kentaro NISHIMORI  Keizo CHO  Yasushi TAKATORI  Toshikazu HORI  

Publication
IEICE TRANSACTIONS on Communications   Vol.E83-B   No.8   pp.1688-1696
Publication Date: 2000/08/25
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Personal, Indoor and Mobile Radio Communications)
Category: 
Keyword: 
adaptive array,  elevated base station,  co-channel interference,  microcell,  element spacing,  

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