US 12,224,779 B2
Transmitter, receiver, transmission method, reception method, and non-transitory computer readable storage medium for performing beamforming in wireless transmission
Mikihiro Ouchi, Osaka (JP); Tomohiro Kimura, Osaka (JP); Yusuke Chinda, Miyagi (JP); and Kazuhiko Kikuchi, Miyagi (JP)
Assigned to Panasonic Holdings Corporation, Osaka (JP)
Filed by Panasonic Holdings Corporation, Osaka (JP)
Filed on Dec. 14, 2022, as Appl. No. 18/066,210.
Claims priority of application No. 2021-205966 (JP), filed on Dec. 20, 2021.
Prior Publication US 2023/0198552 A1, Jun. 22, 2023
Int. Cl. H04B 1/00 (2006.01); H04B 17/11 (2015.01)
CPC H04B 1/0007 (2013.01) [H04B 17/11 (2015.01)] 18 Claims
OG exemplary drawing
 
1. A transmitter comprising:
a plurality of antenna elements;
a calibration signal generator which, in operation, generates a digital calibration signal;
a transmission processing execution unit which, in operation, performs transmission processing including digital-to-analog conversion on second digital signals to generate first analog signals, the second digital signals being obtained by adding the digital calibration signal to each of a plurality of first digital signals, the first digital signals each corresponding to respective one of the antenna elements;
a reception processing execution unit which, in operation, performs reception processing including analog-to-digital conversion on the first analog signals to generate third digital signals each corresponding to respective one of the antenna elements, the first analog signals each passing through respective one of the antenna elements;
a transmission characteristics calculator which, in operation, performs correlation calculation between the digital calibration signal and each of the third digital signals to calculate transmission delay characteristics each corresponding to respective one of the antenna elements and which, in operation, calculates transmission delay correction amounts based on the transmission delay characteristics, each of the transmission delay correction amounts corresponding to respective one of the antenna elements; and
a transmission characteristics corrector which, in operation, corrects the transmission delay characteristics based on the transmission delay correction amounts.