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1. (WO2015127162) SYSTEMS AND METHODS OF LINEAR IMPAIRMENT MODELLING TO IMPROVE DIGITAL PRE-DISTORTION ADAPTATION PERFORMANCE

Pub. No.:    WO/2015/127162    International Application No.:    PCT/US2015/016746
Publication Date: Fri Aug 28 01:59:59 CEST 2015 International Filing Date: Sat Feb 21 00:59:59 CET 2015
IPC: H03G 1/04
H03F 3/189
Applicants: TEXAS INSTRUMENTS INCORPORATED
TEXAS INSTRUMENTS JAPAN LIMITED
Inventors: ZHAO, Hongzhi
CHEN, Xiaohan
YANG, Zigang
Title: SYSTEMS AND METHODS OF LINEAR IMPAIRMENT MODELLING TO IMPROVE DIGITAL PRE-DISTORTION ADAPTATION PERFORMANCE
Abstract:
Example embodiment of the systems and methods of linear impairment modeling to improve digital pre-distortion adaptation performance includes a DPD module (610) that is modified during each sample by a DPD adaptation engine (620). A linear impairment modeling module (660) separates the linear and non-linear errors introduced in a power amplifier. The linear impairment model is adjusted during each sample using inputs from the input signal and from an FB post processing module (630). The linear impairment modeling module (660) removes the linear errors, such that the DPD adaptation engine (620) only adapts the DPD module (610) based on the non-linear errors. This increases system stability and allows for the correction of IQ imbalance inside the linear impairment modeling, simplifying the feedback post-processing.