Communications: directive radio wave systems and devices (e.g. – Directive – Including directive communication system
Patent
1999-04-12
2000-10-31
Tarcza, Thomas H.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including directive communication system
455434, H01Q 2124
Patent
active
061409618
ABSTRACT:
Circuitry for controlling the directivity of an adaptive antenna including a plurality of antenna elements and forming the directivity by varying signals fed to the antenna elements such that a gain in a preselected direction increases is disclosed. The circuitry includes a transmitting section for transmitting a scanning pilot channel for scanning on a downlink while causing the pilot channel to move in a propagation range covered by the adaptive antenna. A receiving section receives a signal representative of the intensity of the scanning pilot channel received by a mobile station. A controller detects a transmission direction in which the mobile station receives the scanning pilot channel with the highest quality, and applies the directivity parameter of the detected direction to the directivity of a downlink. The circuitry improves the directivity of the downlink in mobile communication.
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patent: 5583852 (1996-12-01), Ikeda et al.
patent: 5625885 (1997-04-01), Nakazawa et al.
patent: 5815116 (1998-09-01), Dunbridge et al.
patent: 5893033 (1999-04-01), Keskitalo et al.
Foreign Search Report.
NEC Corporation
Phan Dao L.
Tarcza Thomas H.
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