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:
Mar. 22, 2005
Filed:
Aug. 02, 1999
Yoshiharu Doi, Gifu, JP;
Toshinori Iinuma, Gifu, JP;
Yoshiharu Doi, Gifu, JP;
Toshinori Iinuma, Gifu, JP;
Sanyo Electric Co., Ltd., Moriguchi, JP;
Abstract
An adaptive array radio base station comprises at least three antenna elements (ANT(j=1, 2, . . . , n)) and a signal processing circuit (). In calibration, the difference in a phase rotation quantity and the difference in an amplitude fluctuation quantity between a transmission circuit and a receiving circuit in each transmission system are estimated on the basis of a known signal transmitted from each transmission system and a received signal measured in each transmission system. A phase rotation quantity of a phase shifter (PS) and an amplitude fluctuation quantity of an attenuator (ATT) are set on the basis of the results of the estimation. Thus provided are a radio apparatus and a calibration method capable of calibrating transmission characteristics of the transmission circuit and the receiving circuit in a simple structure at a low cost without providing a specific measuring circuit.