Analysis of BER performance in presence of nonlinear distortion due to PD-HPA in downlink DS-CDMA signals

Author

Helaly, Tarek K. ; Dansereau, Richard M. ; El-Tanany, Mohamed

Author_Institution

Dept. of Syst. & Comput. Eng., Carleton Univ., Ottawa, ON, Canada

Volume

14

Issue

4

fYear

2010

fDate

4/1/2010 12:00:00 AM

Firstpage

273

Lastpage

275

Abstract

A predistorter-high power amplifier (PD-HPA) pair has become a common practice in wireless communication to compensate for nonlinear distortion due to HPA. However, the PD-HPA pair still produces severe signal distortion when the input signal exceeds the PD-HPA´s saturation level. The effects of such distortion on bit error rate (BER) degradation in downlink direct sequence-code division multiple access signals (DS-CDMA) are analyzed. We establish which signal characteristics at the HPA input are the factors contributing to BER. Assuming that the baseband CDMA signal is characterized as a complex Gaussian process, we develop analytic expressions for the BER and the contributing factors to BER.

Keywords

Gaussian processes; code division multiple access; error statistics; nonlinear distortion; power amplifiers; spread spectrum communication; Gaussian process; bit error rate degradation; downlink direct sequence-code division multiple access; nonlinear distortion; predistorter-high power amplifier; signal distortion; Baseband; Bit error rate; Degradation; Downlink; Multiaccess communication; Nonlinear distortion; Performance analysis; Power amplifiers; Signal analysis; Wireless communication; CDMA, nonlinear distortion, predistortion.;

fLanguage

English

Journal_Title

Communications Letters, IEEE

Publisher

ieee

ISSN

1089-7798

Type

jour

DOI

10.1109/LCOMM.2010.04.092086

Filename

5439336