US 11,677,476 B2
Radio apparatus and system
Jinfeng Du, West Windsor, NJ (US); Qi Zhou, Matawan, NJ (US); and Di Che, Atlanta, GA (US)
Assigned to NOKIA SOLUTIONS AND NETWORKS OY, Espoo (FI)
Filed by NOKIA SOLUTIONS AND NETWORKS OY, Espoo (FI)
Filed on Jan. 26, 2022, as Appl. No. 17/584,864.
Claims priority of application No. 20215092 (FI), filed on Jan. 28, 2021.
Prior Publication US 2022/0239380 A1, Jul. 28, 2022
Int. Cl. H04B 10/58 (2013.01); H04B 10/2575 (2013.01)
CPC H04B 10/58 (2013.01) [H04B 10/2575 (2013.01)] 12 Claims
OG exemplary drawing
 
1. An apparatus, comprising:
at least one processor; and
at least one memory including computer program code, the at least one memory and computer program code being configured, with the at least one processor, to cause the apparatus to perform:
providing a digital signal;
performing, based on a pre-trained computational model, a predistortion operation on the digital signal to produce a predistorted digital signal;
converting the predistorted digital signal to an analogue signal;
modulating an optical signal based on the analogue signal;
transmitting, the optical signal via an optical channel connected to a remote radio unit for demodulation by an optical demodulator of the remote radio unit for transmission via one or more antennas of the remote radio unit;
wherein the computational model is pre-trained based on feedback data from a radio receiver in wireless signal communication with the remote radio unit, the feedback data indicative of one or more non-linearities introduced by the modulating, the optical channel, the optical demodulator of the remote radio and by one or more amplifiers of the remote radio unit and the radio receiver.