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

Volume

6

fYear

2004

fDate

29 Nov.-3 Dec. 2004

Firstpage

3907

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Global Telecommunications Conference, 2004. GLOBECOM '04. IEEE

Print_ISBN

0-7803-8794-5

Type

conf

DOI

10.1109/GLOCOM.2004.1379100

Filename

1379100