公开(公告)号：US20240022273A1

公开(公告)日：2024-01-18

申请号：US18222413

申请日：2023-07-14

Applicant: NOKIA SOLUTIONS AND NETWORKS OY

Inventor： Tian HE

IPC: H04B1/04

CPC classification number: H04B1/0475 ,  H04B2001/0425

Abstract: Systems, methods, apparatuses, and computer program products for an enhanced polyphase digital pre-distortion (DPD) structure in a radio transmitter. A method may include creating a combined pre-distorted component by combining each of the pre-distorted polyphase components. Each of the plurality of pre-distorted polyphase components are single phase dependent. Further, the method may include feeding the combined pre-distorted component to an output filter to form a pre-distorted transmission signal. The method may also include generating an output signal by applying the pre-distorted transmission signal to the power amplifier to generate an output signal.

公开(公告)号：US20220173704A1

公开(公告)日：2022-06-02

申请号：US17455278

申请日：2021-11-17

Applicant: Nokia Solutions and Networks Oy

Inventor： Tian HE ,  Chad YOUNG ,  Shavantha KULARATNA ,  Peter NOVAK ,  Jacob Edward LONGWELL

IPC: H03F1/32 ,  H03F3/21

Abstract: This specification relates to digital pre-distortion of signals before power amplification during the transmission of a signal. A method comprising: receiving an input signal 1st and 2nd subband signals associated with 1st and 2nd centre frequencies; applying a pre-distortion to the input signal to generate a pre-distorted signal, the pre-distortion applying an inverse to a power amplification model associated with a power amplifier; and outputting the pre-distorted signal for power amplification. The power amplification model or the inverse to the power amplification model comprises a first plurality of terms and a second plurality of terms. Each of the 1st and 2nd plurality of terms comprising a product of a complex coefficient, a power factor, and other factors depending on if it is 1st or 2nd plurality of terms.

公开(公告)号：US20220140858A1

公开(公告)日：2022-05-05

申请号：US17511191

申请日：2021-10-26

Applicant: Nokia Solutions and Networks Oy

Inventor： Tian HE ,  Chad YOUNG ,  Shavantha KULARATNA

IPC: H04B1/62 ,  H04B1/00 ,  H04B1/04

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.

公开(公告)号：US20240022217A1

公开(公告)日：2024-01-18

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: H03F1/32

CPC classification number: H03F1/3247 ,  H03F2200/451

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).