US 12,074,736 B2
Radio transmitter and method therefor
Yunji Zheng, Beijing (CN); and Haiying Krishna Cao, Beijing (CN)
Assigned to TELEFONAKTIEBOLAGET LM ERICSSON (PUBL), Stockholm (SE)
Appl. No. 18/006,126
Filed by Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)
PCT Filed Jul. 20, 2020, PCT No. PCT/CN2020/103103
§ 371(c)(1), (2) Date Jan. 19, 2023,
PCT Pub. No. WO2022/016336, PCT Pub. Date Jan. 27, 2022.
Prior Publication US 2023/0291619 A1, Sep. 14, 2023
Int. Cl. H04L 25/03 (2006.01); H04B 1/04 (2006.01); H04L 27/36 (2006.01)
CPC H04L 25/03343 (2013.01) [H04B 1/04 (2013.01); H04L 27/36 (2013.01); H04B 2001/0425 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A radio transmitter comprising:
a first power amplifier (PA) corresponding to a first antenna port;
an observation receiver configured to process an output from the first PA to feed back an observation signal;
a first determination module configured to determine a first function reflecting a nonlinearity of the first PA, based on a first input signal to the first PA, the observation signal and a first set of parameters characterizing the first PA;
a first pre-distortion module configured to determine a first pre-distortion and apply the first pre-distortion to a first baseband signal for the first antenna port;
one or more second PA each corresponding to a second antenna port;
one or more second determination module each configured to determine a second function reflecting a nonlinearity of the second PA, based on the first function and a difference between a second set of parameters characterizing the second PA and the first set of parameters; and
one or more second pre-distortion module each configured to determine a second pre-distortion based on the second function and apply the second pre-distortion to a second baseband signal for the second antenna port.