Digital I/Q modulator having a predistortion

Details Digital I/Q modulator having a predistortion Digital I/Q modulator having a predistortion

2007-01-02

2007-01-02

Ghayour, Mohammed (Department: 2611)

Pulse or digital communications

Transmitters

Antinoise or distortion

C455S114300, C398S193000, C375S278000, C375S284000, C375S285000

Reexamination Certificate

active

10221636

ABSTRACT:
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.

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James Cavers; Amplifier Linearization Using a Digital Predistorter with Fast Adaptation and Low Memory Requirements; Nov. 1990; IEEE Transactions on Vehicular Technology, vol. 39; pp. 374-382.
International Preliminary Examination Report, dated Aug. 19, 2002.

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