System and method for predistorting a signal to reduce...

Details System and method for predistorting a signal to reduce... System and method for predistorting a signal to reduce...

2007-03-20

2007-03-20

Tse, Young T. (Department: 2611)

Pulse or digital communications

Transmitters

Antinoise or distortion

C330S149000

Reexamination Certificate

active

10159657

ABSTRACT:
A predistortion system uses spectral regrowth filtering in a feedback path thereof to reduce out-of-band error. An illustrative embodiment of the system includes a predistortion circuit which generates a predistorted signal, one or more signal processing elements configured to process the predistorted signal, and a feedback processing circuit coupled between an output of the one or more signal processing elements and a control input of the predistortion circuit. Associated with the feedback processing circuit is at least one spectral regrowth filter. The spectral regrowth filter is configured to pass an out-of-band portion of a feedback signal while attenuating an in-band portion of the feedback signal, and operates in conjunction with the feedback processing circuit to control one or more characteristics of the predistortion circuit.

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U.S. Appl. No. 09/915,042, filed Jul. 25, 2001, C.R. Giardina et al., “System and Method for Predistorting a Signal Using Current and Past Signal Samples.”
U.S. Appl. No. 09/928,628, Aug. 13, 2001, C.R. Giardina et al., “Multiple Stage and/or Nested Predistortion System and Method.”

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