Patent ID: 11936343
Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 7:
8. A Multiple-Input Multiple-Output, MIMO, transmitter, comprising:
a plurality of antenna branches comprising a respective plurality of power amplifiers coupled to a respective plurality of antenna elements; and
a plurality of Iterative Learning Control, ILC, Digital Predistortion, DPD, systems operable to predistort a plurality of input signals for the plurality of antenna branches, respectively, using an ILC per branch MIMO DPD scheme with kernel regression;
wherein each ILC DPD system of the plurality of ILC DPD systems is further operable to:
obtain a number, N, of samples of a respective one of the plurality of input signals;
determine a desired input signal, Ul, for a respective one of the plurality of antenna branches;
generate a kernel regression matrix, θl, for the respective one of the plurality of antenna branches based on the number, N, of samples of the respective one of the plurality of input signals; and
compute one or more model parameters for a DPD model utilized by the ILC DPD system to predistort the respective one of the plurality of input signals based on the kernel regression matrix, θl, and the desired input signal, Ul, for the respective one of the plurality of antenna branches.