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:
Apr. 10, 2007
Filed:
Sep. 29, 2003
Mikio Kuwahara, Chlyoda-ku, Tokyo 100-8220, JP;
Nobukazu Doi, Chlyoda-ku, Tokyo 100-8220, JP;
Toshiro Suzuki, Chlyoda-ku, Tokyo 100-8220, JP;
Yuji Ishida, Chlyoda-ku, Tokyo 100-8220, JP;
Takashi Inoue, Shinjuku-ku, Tokyo 163-8003, JP;
Sumaru Niida, Shinjuku-ku, Tokyo 163-8003, JP;
Mikio Kuwahara, Chlyoda-ku, Tokyo 100-8220, JP;
Nobukazu Doi, Chlyoda-ku, Tokyo 100-8220, JP;
Toshiro Suzuki, Chlyoda-ku, Tokyo 100-8220, JP;
Yuji Ishida, Chlyoda-ku, Tokyo 100-8220, JP;
Takashi Inoue, Shinjuku-ku, Tokyo 163-8003, JP;
Sumaru Niida, Shinjuku-ku, Tokyo 163-8003, JP;
Other;
Abstract
Phase and amplitude deviations, which are generated, for example, by cables connecting an array antenna of a CDMA base station and the base station, are calibrated in the baseband. The base station comprises: an antenna apparatus; couplers; an RF unitthat converts a receive signal to a baseband signal, converts a transmit signal to a radio frequency, and performs power control; an A/D converterfor converting a receive signal to a digital signal; a receive beam form unitthat multiplies the receive signal by semi-fixed weight; a despreaderfor this signal input; a time-space demodulatorfor demodulating user data; a despreaderfor probe signal; a space modulatorfor user data; a spreaderfor user signal; a channel combiner; a Tx calibraterfor controlling calibration of a signal; a D/A converter; a unitfor calculation of correlation matrix for generating a probe signal used for controlling an Rx calibration system and a TX calibration system; a spreaderfor probe signal; a power control unit; a D/A converter; an RF unitfor probe signal; an A/D converterfor signal from the couplers; and a despreader