公开(公告)号：US12212353B2

公开(公告)日：2025-01-28

申请号：US18351623

申请日：2023-07-13

Applicant: Nokia Solutions and Networks Oy

Inventor： Chad Young ,  Tian He ,  Shavantha Kularatna ,  Peter Novak ,  Jacob Edward Longwell

IPC: H04B1/04 ,  H03F1/32

Abstract: As solution for predistorting a signal is presented. The solution comprises receiving (600) as an input a signal comprising at least two signal components on a different band, sampling (602) the input signal comprising linear terms, composite non-linear terms causing intermodulation outside Nyquist band of the input signal and further non-linear terms causing intermodulation inside the Nyquist band, the further non-linear terms comprising multi-band terms. Oversampling (604) by a given factor is applied to the signal in a first predistortion circuit for processing the linear terms and composite non-linear terms causing intermodulation outside Nyquist band; processing (606) the input signal without oversampling in a second predistortion circuit in parallel with the first predistortion circuit for the further non-linear terms. The rates of the output signals of the predistortion circuits are matched (608), combined and filtered (610).

公开(公告)号：US11057063B1

公开(公告)日：2021-07-06

申请号：US17166165

申请日：2021-02-03

Applicant: NOKIA SOLUTIONS AND NETWORKS OY

Inventor： Tian He

IPC: H04B1/04 ,  H03F1/32

Abstract: A model structure modeling a power amplifier is based on at least a binomial expansion, a first building block, a second building block, and a third building block. The first building block is a first complex sub-band signal with a first delay, the second building block is a multiplication of the first complex sub-band signal with a second delay and a complex conjugate of the first complex sub-band signal with a third delay, and the third building block is a multiplication of a second complex sub-band signal with a fourth delay and a complex conjugate of the second complex sub-band signal with a fifth delay. The sum of the first complex sub-band signal and the second complex sub-band signal is a baseband signal. Terms are obtained by optimizing delay combinations for the model structure. The model structure is used to dual-band digital pre-distortion of the baseband signal.

公开(公告)号：US12034470B2

公开(公告)日：2024-07-09

申请号：US17511191

申请日：2021-10-26

Applicant: Nokia Solutions and Networks Oy

Inventor： Tian He ,  Chad Young ,  Shavantha Kularatna

IPC: H04B1/04 ,  H03F1/32 ,  H03F3/24 ,  H04B1/00 ,  H04B1/62 ,  H04L27/36

CPC classification number: H04B1/62 ,  H04B1/0078 ,  H04B1/0458 ,  H04B2001/0408

Abstract: An apparatus is disclosed, comprising means for providing two or more amplifiers for amplifying signals in two or more respective frequency bands, receiving a composite signal comprising first and second predistorted input signals in first and second frequency bands and filtering the composite signal to provide (i) the first predistorted signal for input to a first amplifier of the two or more amplifiers for producing an amplified first output signal and (ii) the second predistorted signal for input to a second amplifier of the two or more amplifiers for producing an amplified second output signal. The apparatus may also comprise means for routing, at non-overlapping times, the first and second output signals to a common feedback path and for linearizing received first and second input signals based on the respective first and second output signals received on the common feedback path.