Polar modulator arrangement, polar modulation method, filter arrangement and filtering method

摘要

A polar modulator arrangement includes a first and a second node to receive a signal having a first and a second component corresponding to an amplitude component and a phase component. A frequency separation device separates the first component into a low-frequency portion and a high-frequency portion depending on a cut-off frequency. The high-frequency portion is nonlinearly filtered and combined with the low-frequency portion to a first processed component. A combination element generates a polar modulated radio frequency signal as a function of the first processed component and the second component.

主权项

1. A polar modulator arrangement, comprising:
a first and a second node configured to receive a signal comprising a first and a second component corresponding to an amplitude component and a phase, respectively; a first frequency separation device configured to separate the first component into a first low-frequency portion and a first high-frequency portion depending on a first cut-off frequency; a first nonlinear filter device configured to filter the first high-frequency portion to a filtered first high frequency portion, wherein the filtered first high-frequency portion corresponds to the first high-frequency portion if a value of the first high-frequency portion is less than a first threshold value, and wherein the filtered first high-frequency portion corresponds to a scaled version of the first high-frequency portion of the value if the first high-frequency portion is greater than the first threshold value and less than a second threshold value; a first summation element configured to combine the filtered first high-frequency portion and the first low-frequency portion to form a first processed component; and a combination element configured to generate a polar modulated radio frequency signal as a function of the first processed component and the second component; and comprising at least one of the following two elements:
a notch filter element configured to perform a notch filtering of the first processed component and the second component prior to submission to the combination element, ora low-pass filter element configured to perform a low-pass filtering of the first processed component and the second component, wherein the low-pass filter element comprises filters configured to perform low-pass filtering at different cut-off frequencies for the first and the second component.