Title :
An application of a digital predistortion linearizer to CDMA HPAs
Author :
Im, Sungbin ; Powers, Edward J.
Author_Institution :
Sch. of Electron. Eng., Soongsil Univ., Seoul, South Korea
fDate :
29 Nov.-3 Dec. 2004
Abstract :
The high power amplifier (HPA) is a key part of the transmit chain, but inherently nonlinear. Nonlinearity of the HPA causes intermodulation distortion (IMD). In order to compensate for the IMD, linearization techniques are required. Digital predistortion is one such technique. In this paper, we present an overview of the digital predistortion linearizer that we developed and the experimental results of applying this linearizer to an HPA for IS-95. The experimental results show that the developed linearizer effectively suppresses the IMD by 7 to 10 dB depending on the signal bandwidth.
Keywords :
UHF power amplifiers; code division multiple access; error compensation; linearisation techniques; 30 W; 885 MHz; CDMA HPA; IMD compensation; IMD suppression; digital predistortion linearizer; intermodulation distortion; linearization techniques; nonlinear high power amplifier; wide bandwidth linearity; Digital signal processing; Feedback; Field programmable gate arrays; High power amplifiers; Multiaccess communication; Power engineering and energy; Predistortion; Radio frequency; Signal processing; Table lookup;
Conference_Titel :
Global Telecommunications Conference, 2004. GLOBECOM '04. IEEE
Print_ISBN :
0-7803-8794-5
DOI :
10.1109/GLOCOM.2004.1379100
