Invention Grant
- Patent Title: Method and apparatus for digital pre-distortion with reduced oversampling output ratio
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Application No.: US15688766Application Date: 2017-08-28
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Publication No.: US10541657B2Publication Date: 2020-01-21
- Inventor: Igor Gutman , Ariel Sagi , Alecsander Eitan
- Applicant: QUALCOMM Incorporated
- Applicant Address: US CA San Diego
- Assignee: QUALCOMM Incorporated
- Current Assignee: QUALCOMM Incorporated
- Current Assignee Address: US CA San Diego
- Agency: Loza & Loza LLP
- Agent Steven R. Thiel
- Main IPC: H04L27/36
- IPC: H04L27/36 ; H03F1/32 ; H03M1/00 ; H04B1/00

Abstract:
Certain aspects of the present disclosure are directed to a digital predistortion (DPD) device for use within a wireless transmitter that permits the use of a downstream digital-to-analog converter that operates at a clock rate close to the bandwidth of a digital baseband input signal. In some examples, a sampling rate of a digital baseband input signal is increased using an upsampler to obtain an increased rate digital input signal. Predistortion is applied to the increased rate digital input signal using a DPD device to obtain a predistorted digital signal. The sampling rate of the predistorted digital signal is then decreased using a downsampler to obtain a lower-rate predistorted digital signal with a sampling rate below the increased rate of the upsampler (e.g. close to the bandwidth of a digital baseband input signal). A low pass filter may be provided to filter out-of-band signal components from the predistorted digital signal.
Public/Granted literature
- US20190068133A1 METHOD AND APPARATUS FOR DIGITAL PRE-DISTORTION WITH REDUCED OVERSAMPLING OUTPUT RATIO Public/Granted day:2019-02-28
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