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. 09, 2021
Filed:
Jul. 30, 2018
Nec Corporation, Tokyo, JP;
Takuji Mochizuki, Tokyo, JP;
NEC CORPORATION, Tokyo, JP;
Abstract
An active antenna system includes: a plurality of antennas; a plurality of switches respectively connected to the antennas, the switches being configured to switch between transmission signal lines and reception signal lines to perform Time Division Duplex; a plurality of transmitter-receivers respectively connected to the transmission signal lines and the reception signal lines; a calibration transmitter connected to the transmission signal lines; a calibration receiver connected to the reception signal lines; and a control unit configured to carry out, during a receiving time of the Time Division Duplex, reception calibration of each of the transmitter-receivers based on a signal transmitted by the calibration transmitter and received by the transmitter-receivers, and, during a transition time from reception to transmission, carry out transmission calibration of each of the transmitter-receivers based on a signal transmitted by the transmitter-receivers and received by the calibration receiver.