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1. (WO2018057215) CLOSED LOOP DIGITAL PRE-DISTORTION

Pub. No.:    WO/2018/057215    International Application No.:    PCT/US2017/048282
Publication Date: Fri Mar 30 01:59:59 CEST 2018 International Filing Date: Thu Aug 24 01:59:59 CEST 2017
IPC: H03F 1/32
H03F 3/24
H03F 3/189
H04B 1/04
H04L 27/36
Applicants: QUALCOMM INCORPORATED
Inventors: BUTLER, Paul Brandon
GARDNER, James
TALWALKAR, Niranjan
BAYTEKIN, Burcin
Title: CLOSED LOOP DIGITAL PRE-DISTORTION
Abstract:
A system and method for calibrating digital pre-distortion in a wireless device (400). A pre-distortion circuit (410) may output a first training signal while a power amplifier (420) of the wireless device (400) is on, to generate a first feedback signal. The first feedback signal may be fed back to the pre-distortion circuit (410) via a receive path (402) of the wireless device (400). The pre-distortion circuit (410) may output a second training signal while the power amplifier (420) is off, to generate a second feedback signal. The second feedback signal may be fed back to the pre-distortion circuit (410) via the receive path (402). The pre-distortion circuit (410) may then determine one or more pre-distortion coefficients based on the first and second feedback signals.