Title:
RADIO COMMUNICATION APPARATUS AND CALIBRATION METHOD
Document Type and Number:
Japanese Patent JP2017152872
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To accurately correct phase errors of antennas.SOLUTION: Based on reception signals that are received from three or more terminals via multiple antennas 23, a channel estimation section 33 estimates a channel vector for each terminal. A phase difference calculation section 35 calculates a first phase difference between two channel vectors for each combination of the two channel vectors among the channel vectors that are estimated on a terminal basis. An arrival direction estimation section 34 estimates an arrival direction of the reception signal for each terminal based on the phase difference that is calculated by the phase difference calculation section 35. Based on the arrival direction of the reception signal that is estimated for each terminal by the arrival direction estimation section 34 and the channel vector that is estimated for each terminal by the channel estimation section 33, a phase error estimation section 32 estimates phase errors of the antennas 23. Based on the phase errors of the antennas 23 that are estimated by the phase error estimation section 32, a phase control section 31 corrects phases of signals to be transmitted/received via the antennas 23.SELECTED DRAWING: Figure 2
Inventors:
OZAKI KAZUYUKI
Application Number:
JP2016032493A
Publication Date:
August 31, 2017
Filing Date:
February 23, 2016
Export Citation:
Assignee:
FUJITSU LTD
International Classes:
H04B7/10; G01S3/48; H01Q3/34; H01Q21/06; H04J99/00; H04W16/28
Attorney, Agent or Firm:
Sakai International Patent Office