Resources Contact Us Home
Digital I/Q modulator having a predistortion

Image Number 9 for United States Patent #7158582.

An I/Q modulator processes a time-discrete I/Q signal comprising an I component and a Q component. The I/Q signal is based on a sampling frequency which is equal to four times a carrier frequency of a carrier signal onto which the I/Q signal is modulated. A predistorter of the modulator predistort the I and components with a predistortion signal, which depends on the I and Q components, so as to form a predistorted I component and, in temporal alternation therewith, a predistorted Q components. An adjuster of the modulator adjusts the signs of the predistorted I and Q components so that two temporally successive predistorted components have a first sign and two additional successive predistorted components, which follow the first-mentioned components in time, have a second sign which is the inverse of the first sign, so as to produce therefrom an output signal at an output of the modulator.

  Recently Added Patents
Bezel-less electronic display
Voltage regulator structure that is operationally stable for both low and high capacitive loads
Bit error mitigation
Managing deduplication density
Mobility management in a communications system
Flexible lighting devices
Signal processing apparatus and methods
  Randomly Featured Patents
Display screen with a color icon
Tube cutting device
Electronic apparatus and program for controlling computer
Ink-jet printing method
Method for measuring the wave aberrations of the eye
Thermal transfer recording material and thermal transfer recording method
Dynamic rate control method and apparatus for electronically played games and gaming machines
Remote guidance system for medical devices for use in environments having electromagnetic interference
Method and apparatus for treating fibrous material
Analog phase-locked loop including voltage regulator