US 9,813,028 B2
Wireless device
Satoshi Matsubara, Kawasaki (JP); and Hideharu Shako, Yokohama (JP)
Assigned to FUJITSU LIMITED, Kawasaki (JP)
Filed by FUJITSU LIMITED, Kawasaki-shi, Kanagawa (JP)
Filed on Aug. 30, 2016, as Appl. No. 15/251,871.
Claims priority of application No. 2015-190414 (JP), filed on Sep. 28, 2015.
Prior Publication US 2017/0093346 A1, Mar. 30, 2017
Int. Cl. H03F 1/26 (2006.01); H03F 1/32 (2006.01); H03F 3/24 (2006.01); H04W 88/02 (2009.01)
CPC H03F 1/32 (2013.01) [H03F 3/245 (2013.01); H04W 88/02 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A wireless device comprising:
an amplifier that amplifies electrical power of a signal that is wirelessly transmitted;
a calculating unit that selects first samples and second samples, between which a difference in electrical power or phase is within a first range, in a predetermined number of first samples and the predetermined number of second samples corresponding to a first signal that is a signal before amplification in the amplifier and a second signal that is a signal after amplification in the amplifier, respectively, and that calculates a cumulative value for each of the selected first samples and the selected second samples, and that calculates a phase difference between the first signal and the second signal by using the cumulative value;
a correction unit that corrects the phase difference by using a correction amount calculated from the phase difference; and
an updating unit that updates, by using the first signal and the second signal of which the phase difference is corrected, a distortion compensation coefficient that is used to compensate nonlinear distortion generated in the amplifier.