The effect of nonlinear amplifiers on orthogonal-CDMA link and measures of performance, using a simplified amplifier model

Author

Silberger, Amnon

Author_Institution

Qualcomm Inc., San Diego, CA, USA

Volume

2

fYear

1997

fDate

12-16 Oct 1997

Firstpage

521

Abstract

Existing and forthcoming personal communication systems (PCS) like Globalstar, use orthogonal-CDMA (O-CDMA) modulation and solid state power amplifiers (PAs). These amplifiers are often operated near saturation to maximize user capacity. In this paper an ideal one carrier O-CDMA system and a simple cubic law PA are used to gain understanding on the performance degradation due to working near saturation of the PA. Three measures of performance are compared: noise power ratio (NPR), a suggested Walsh power ratio (WPR) measure and uncoded symbol error rate (SER). Results of all these measures, both analytical and numerical, are presented. It is concluded that WPR and SER are both acceptable, while NPR is too optimistic

Keywords

code division multiple access; mobile satellite communication; modulation; personal communication networks; power amplifiers; Globalstar; NPR; O-CDMA modulation; PCS; SER; WPR; Walsh power ratio; cubic law PA; ideal one carrier O-CDMA system; noise power ratio; nonlinear amplifiers; orthogonal-CDMA link; performance; personal communication systems; saturation; simplified amplifier model; solid state power amplifiers; uncoded symbol error rate; user capacity; Degradation; Error analysis; Gain measurement; Noise measurement; Performance gain; Personal communication networks; Power amplifiers; Power measurement; Signal to noise ratio; Solid state circuits;

fLanguage

English

Publisher

ieee

Conference_Titel

Universal Personal Communications Record, 1997. Conference Record., 1997 IEEE 6th International Conference on

Conference_Location

San Diego, CA

ISSN

1091-8442

Print_ISBN

0-7803-3777-8

Type

conf

DOI

10.1109/ICUPC.1997.627219

Filename

627219