IQ PHASE IMBALANCE CORRECTION METHOD IN CARTESIAN LINEARIZATION FEEDBACK PATH WITH DUAL PHASE SHIFTERS

摘要

A communication device, transmitter, and system containing dual quadrature phase shifters and method of training the transmitter are provided. During training, a phase training module determines the phase imbalance in each of in-phase and quadrature Cartesian feedback paths. The phase training module provides control signals to each of in-phase and quadrature dual phase shifters to provide separate and independent phase corrections for the paths. During one training cycle, individual sessions are used to train the in-phase and quadrature dual phase shifters. The latter session uses the results of the former session to provide an initial value for the phase shift to be provided as a result of the latter session, thereby reducing the overall time used to train both the in-phase and quadrature dual phase shifters.