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

Claim 14:
15. A method of performing Digital Predistortion, DPD, in 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, the method comprising:
determining one or more model parameters for each antenna branch of the plurality of antenna branches for an Iterative Learning Control, ILC, per branch MIMO DPD scheme with kernel regression; and
predistorting a plurality of input signals for the plurality of antenna branches, respectively, to provide a respective plurality of predistorted input signals for the plurality of antenna branches based on the determined one or more model parameters in accordance with the ILC per branch MIMO DPD scheme with kernel regression; wherein predistorting the plurality of input signals for the plurality of antenna branches comprises:
obtaining a number, N, of samples of a respective one of the plurality of input signals;
determining a desired input signal, Ul, for a respective one of the plurality of antenna branches;
generating 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
computing 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.