Amplifiers – Hum or noise or distortion bucking introduced into signal...
Reexamination Certificate
2005-10-18
2005-10-18
Jeanpierre, Peguy (Department: 2819)
Amplifiers
Hum or noise or distortion bucking introduced into signal...
C375S296000, C375S297000
Reexamination Certificate
active
06956433
ABSTRACT:
A polynomial predistorter and predistorting method for predistorting a complex modulated baseband signal are provided. In the polynomial predistorter, a first complex multiplier generates first complex predistortion gains, using a current input signal and complex polynomial coefficients modeled on the inverse non-linear distortion characteristic of the power amplifier, and multiplies them by I and Q signal components of the current input signal, respectively. At least one second complex multiplier generates second complex predistortion gains using the complex polynomial coefficients and previous predistorted signals and multiplies them by I and Q signal components of the previous predistorted signals, respectively. A summer sums the outputs of the first and second complex multipliers and outputs the sum as a predistorted signal to the power amplifier.
REFERENCES:
patent: 5886584 (1999-03-01), Tanai et al.
patent: 6075411 (2000-06-01), Briffa et al.
patent: 6141390 (2000-10-01), Cova
patent: 6252914 (2001-06-01), Yamamoto
patent: 6587513 (2003-07-01), Ichihara
Kim Dong-Hyun
Shin Dong-Won
Jeanpierre Peguy
Nguyen Khai
Roylance Abrams Berdo & Goodman LLP
Samsung Electronics Co,. Ltd.
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