Patent ID: 8824594
Filing Date: 2014-09-02
Classification: H04L

Abstract:
1. A digital transmitter comprising: a digital upconverter generating a radio-frequency (RF) output signal having a predetermined output frequency from a sequence of predistorted digital in-phase (I) and quadrature (Q) data words generated from respective input I and Q data words provided from respective I and Q data channels; a programmable local oscillator (PLO) that provides a local oscillator (LO) signal to the digital upconverter in accordance with which the predetermined output frequency is established, the phase and period of the LO signal being selectable in accordance with a control signal provided to the PLO; and a predistortion processor receiving the input I and Q data words from the respective I and Q data channels and generating the predistorted I and Q data words, the predistortion processor comprising: wherein the control signal is indicative of both the phase shift and the period change in the LO signal.