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

Claim 15:
16. 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 single Digital Predistortion, DPD, system operable to, for a single group of antenna branches comprising at least two of the plurality of antenna branches:
determine one or more model parameters for a combined MIMO DPD scheme for the group of antenna branches, the combined MIMO DPD scheme being an Iterative Learning Control, ILC, combined MIMO DPD scheme with kernel regression by being operable to:
obtain a number, N, of samples of each of a plurality of input signals;
determine a desired combined input signal, U, for the plurality of antenna branches;
generate a kernel regression matrix, θ, for the plurality of antenna branches based on the number, N, of samples of each of the plurality of input signals; and
compute one or more model parameters for a DPD model utilized by the single DPD system to predistort the plurality of input signals based on the kernel regression matrix, θ, and the desired combined input signal, U; and

predistort the plurality of input signals for the group of antenna branches to provide a plurality of predistorted input signals for the plurality of antenna branches based on the determined one or more model parameters in accordance with the combined MIMO DPD scheme for the group of antenna branches.