Title :
Power amplifier linearization using cubic spline interpolation
Author :
Lohtia, Anit ; Goud, Paul A. ; Englefield, Colin G.
Author_Institution :
TR Labs., Edmonton, Alta., Canada
Abstract :
An adaptive RF power amplifier linearization technique is presented. The demodulated amplifier output is compared with the baseband input signal to estimate the amplifier´s AM-AM and AM-PM characteristics, using cubic spline interpolation. The input signal is predistorted using these estimated characteristics to compensate for the amplifier´s nonlinearity. The proposed technique has nearly 14 dB better suppression of the intermodulation products than the complex gain predistortion technique. The out-of-band power emission is about 12 dB lower in the first two adjacent RF channels than is obtained using the Cartesian coordinate negative feedback technique
Keywords :
adaptive signal detection; adjacent channel interference; interference suppression; intermodulation; interpolation; linearisation techniques; power amplifiers; radiofrequency amplifiers; splines (mathematics); AM-AM characteristics; AM-PM characteristics; adaptive RF power amplifier linearization; cubic spline interpolation; intermodulation products; out-of-band power emission; predistortion; High power amplifiers; Interpolation; Linearity; Nonlinear distortion; Power amplifiers; Predistortion; RF signals; Radio frequency; Radiofrequency amplifiers; Spline;
Conference_Titel :
Vehicular Technology Conference, 1993., 43rd IEEE
Conference_Location :
Secaucus, NJ
Print_ISBN :
0-7803-1267-8
DOI :
10.1109/VETEC.1993.508782
