Method and apparatus for wideband predistortion linearization
First Claim
Patent Images
1. An apparatus for compensating for distortion over a wideband, the apparatus comprising:
- means for receiving an input wideband radio frequency signal;
predistortion circuitry which includes means for generating a wideband predistortion signal which is a low order polynomial and which compensates for third order and higher order intermodulation distortion products; and
a circuit for applying the wideband predistortion signal to the input wideband radio frequency signal.
1 Assignment
0 Petitions
Accused Products
Abstract
A predistortion signal is generated which compensates for third order and higher order intermodulation distortion over a wideband. The predistortion signal is applied to an input radio frequency signal, for example a multi-tone radio frequency signal. The predistortion signal is a low order polynomial having adjustable coefficients. The predistortion signal can compensate for intermodulation products produced a nonlinear amplifier, and the polynomial coefficients can be adjusted based on the difference between the amplifier output and the input radio frequency signal.
136 Citations
20 Claims
-
1. An apparatus for compensating for distortion over a wideband, the apparatus comprising:
-
means for receiving an input wideband radio frequency signal; predistortion circuitry which includes means for generating a wideband predistortion signal which is a low order polynomial and which compensates for third order and higher order intermodulation distortion products; and a circuit for applying the wideband predistortion signal to the input wideband radio frequency signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 14)
-
-
12. A method of compensating for distortion over a wideband, the method comprising the steps of:
-
receiving an input wideband radio frequency signal; generating a wideband predistortion signal, which is a low order polynomial; and applying the wideband, low order polynomial predistortion signal to the input wideband radio frequency signal, wherein the wideband, low order polynomial predistortion signal contains terms that compensate for third order and higher order intermodulation distortion products. - View Dependent Claims (13, 15, 16, 17, 18, 19, 20)
-
Specification