The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 08, 2009
Filed:
Mar. 09, 2007
Mikio Kuwahara, Kokubunji, JP;
Nobukazu Doi, Hachioji, JP;
Toshiro Suzuki, Tama, JP;
Yuji Ishida, Fujisawa, JP;
Takashi Inoue, Irima, JP;
Sumaru Niida, Irima, JP;
Mikio Kuwahara, Kokubunji, JP;
Nobukazu Doi, Hachioji, JP;
Toshiro Suzuki, Tama, JP;
Yuji Ishida, Fujisawa, JP;
Takashi Inoue, Irima, JP;
Sumaru Niida, Irima, JP;
Hitachi, Ltd., Tokyo, JP;
KDDI Corporation, Tokyo, JP;
Abstract
A radio base station apparatus provided with an array antenna having a plurality of antenna elements for calibrating a phase difference among the array antenna elements. The base station has a probe signal adding unit which divides one probe signal and adds the divided probe signals to each receive signals received by the plurality of antenna elements. A probe data extracting unit extracts the probe data from the receive signals added with the probe signal. A phase calibration calculation unit calculates correlating phase calibration values required for calibrating a phase of each receive signal based on the probe data extracted by the probe signal extracting unit. A phase calibration unit calibrates a phase difference among the array antenna elements by calibrating the phase of the each receive signal based on the phase calibration from the phase calibration calculation unit.