Title :
Complex gain and fixed-point digital predistorters for CDMA power amplifiers
Author :
Wustenberg, John W. ; Xing, Helen J. ; Cruz, J.R.
fDate :
3/1/2004 12:00:00 AM
Abstract :
Two digital baseband predistortion techniques, one based on the complex gain digital predistorter (CGDP) approach and the other based on the fixed-point predistorter (FPPD) approach, are used to compensate a nonlinear high-power amplifier (HPA) in an IS-2000 system. Forward-link performance for a perfectly linear HPA, nonlinear HPA, and compensated HPA using both a CGDP and an FPPD are compared using an IS-2000 forward-link simulator. Both predistortion techniques are shown to provide similar forward-link performance and reduction in spectral regrowth of the sidebands for the wide-band compensated HPAs utilized by IS-2000 systems.
Keywords :
UHF power amplifiers; cellular radio; code division multiple access; nonlinear distortion; CDMA systems; IS-2000 system; cellular systems; code division multiple access; complex gain digital predistorter; digital baseband predistortion techniques; fixed-point predistorter; forward-link simulator; nonlinear high-power amplifier; spectral regrowth reduction; wide-band compensated amplifier; Amplitude modulation; Baseband; Digital modulation; High power amplifiers; Multiaccess communication; Phase modulation; Power amplifiers; Predistortion; Quadrature amplitude modulation; Wideband;
Journal_Title :
Vehicular Technology, IEEE Transactions on
DOI :
10.1109/TVT.2004.823547
