System and method for performing predistortion at intermediate frequency
OwnerMunawar Hussein Kermalliinventor
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Abstract
A predistortion system predistorts a signal to be amplified at an intermediate frequency (IF). In certain embodiments, the IF predistortion system frequency downconverts the radio frequency (RF) signal to be amplified to an IF frequency. The IF signal is predistorted and frequency upconverted back to RF prior to amplification. For example, the IF signal can be analog to digitally converted, and the digital IF signal is predistorted. The predistorted digital IF signal is converted back to an analog IF signal, and the analog IF signal is then upconverted to RF prior to amplification.
Claims20
A method of predistorting a signal, said method comprising the steps of:
- converting a radio frequency (RF) signal to an intermediate frequency (IF) signal;
- predistorting said IF signal;
- and
- converting said predistorted IF signal to RF to produce a predistorted RF signal.
A predistortion system comprising:
- predistortion circuitry adapted to convert a radio frequency (RF) signal to an intermediate frequency (IF) signal and to predistort said IF signal and to convert said predistorted IF signal to RF to produce a predistorted RF signal.
A method of predistorting a signal, said method comprising the steps of:
- converting a radio frequency (RF) analog signal to an RF digital signal;
- predistorting said RF digital signal;
- and
- converting to analog said predistorted RF digital signal to produce a predistorted RF analog signal.
A predistortion system comprising:
- predistortion circuitry adapted to convert a radio frequency (RF) analog signal to an RF digital signal, to predistort said RF digital signal, and to convert to analog said predistorted RF digital signal to produce a predistorted RF analog signal.
Dependencies are inferred from the claim text.