Title :
A fixed point approach to wideband amplifier compensation for IS-2000
Author :
Wustenberg, John W. ; Xing, Helen J. ; Cruz, J.R.
Author_Institution :
Oklahoma Univ., Norman, OK, USA
Abstract :
A digital baseband predistorter based on the “fixed point” approach (FPPD) is developed to compensate a nonlinear high power amplifier (HPA) in an IS-2000 system. The FPPD incorporates a memoryless nonlinear HPA model derived from samples of the HPA´s input and output signals to overcome shortcomings in previous FPPDs. Link performance for a perfectly linear HPA, nonlinear HPA, and compensated HPA are compared using an IS-2000 forward link simulator. The FPPD reduces spectral regrowth of the sidebands caused by using a nonlinear HPA by about 7 dB within 1.5 MHz of the carrier frequency
Keywords :
cellular radio; digital radio; digital simulation; radio links; radiofrequency amplifiers; wideband amplifiers; IS-2000; IS-2000 forward link simulator; carrier frequency; cellular radio; digital baseband predistorter; fixed point approach; input signals; link performance; memoryless nonlinear HPA model; nonlinear HPA; nonlinear high power amplifier; output signals; sideband spectral regrowth reduction; wideband amplifier compensation; Baseband; Broadband amplifiers; High power amplifiers; Mobile communication; Modulation; Multiaccess communication; Power amplifiers; Quadrature phase shift keying; Radio frequency; Radiofrequency amplifiers;
Conference_Titel :
Vehicular Technology Conference, 2000. IEEE-VTS Fall VTC 2000. 52nd
Conference_Location :
Boston, MA
Print_ISBN :
0-7803-6507-0
DOI :
10.1109/VETECF.2000.883270
