US 11,791,776 B2
Distortion compensation device, wireless communicator, predistorter, distortion compensation method, and computer program
Eiji Mochida, Osaka (JP)
Assigned to SUMITOMO ELECTRIC INDUSTRIES, LTD., Osaka (JP)
Appl. No. 17/271,008
Filed by SUMITOMO ELECTRIC INDUSTRIES, LTD., Osaka (JP)
PCT Filed Jul. 18, 2019, PCT No. PCT/JP2019/028200
§ 371(c)(1), (2) Date Feb. 24, 2021,
PCT Pub. No. WO2020/044831, PCT Pub. Date Mar. 5, 2020.
Claims priority of application No. 2018-160463 (JP), filed on Aug. 29, 2018.
Prior Publication US 2021/0328553 A1, Oct. 21, 2021
Int. Cl. H03F 1/32 (2006.01); H03F 3/24 (2006.01); H04B 1/04 (2006.01)
CPC H03F 1/32 (2013.01) [H03F 3/245 (2013.01); H04B 1/0475 (2013.01); H03F 2200/171 (2013.01); H03F 2200/451 (2013.01); H03F 2201/3209 (2013.01); H04B 2001/0425 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A distortion compensation device comprising:
a first distortion compensation circuit having a first distortion compensation characteristic for compensating for a first distortion occurring in an output of an amplifier, the first distortion compensation circuit being configured to compensate for the first distortion;
a second distortion compensation circuit having a second distortion compensation characteristic for compensating for a second distortion occurring in the output of the amplifier, the second distortion compensation circuit being configured to compensate for the second distortion; and
an update unit configured to update the second distortion compensation characteristic, wherein
the first distortion includes a non-linear distortion and a memory effect distortion,
the second distortion is a distortion whose temporal change is quicker than the first distortion, and
the update unit updates the second distortion compensation characteristic at a higher frequency than an update frequency of the first distortion compensation characteristic.