Analysis of Inter-Modulation Products and Nonlinear Distortion in RF OFDM Transmitter Systems

Author

Droma, Máirtín O. ; Lei, Yiming ; Bertran, Eduard ; Gilabert, Pere

Author_Institution

Dept. of Electron. & Comput. Eng., Univ. of Limerick, Limerick

fYear

2009

fDate

26-29 April 2009

Firstpage

1

Lastpage

5

Abstract

Orthogonal frequency division multiplexing (OFDM) systems are significantly sensitive to the nonlinear distortion caused by RF power amplifiers. Generally, nonlinear distortion of OFDM signals, which generates a huge number of inter-modulation products (IMPs), is treated as a macro phenomenon. In this paper, low order IMPs are classified into various categories by their composition and the characteristics of IMPs in each category is presented. Relationships between single IMP and nonlinear distortion are also explored. The popular Bessel-Fourier (BF) envelope model with associated three signal representation approaches are used as analysis tools. An IEEE 802.11a signal is used and the nonlinear envelope is measured from a GaN power amplifier.

Keywords

Bessel functions; III-V semiconductors; OFDM modulation; gallium compounds; intermodulation distortion; power amplifiers; radio transmitters; radiofrequency amplifiers; wide band gap semiconductors; Bessel-Fourier envelope model; GaN; IEEE 802.11a signal; RF OFDM transmitter system; RF power amplifier; inter-modulation product analysis; macro phenomenon; nonlinear distortion; orthogonal frequency division multiplexing system; signal representation approach; Distortion measurement; Nonlinear distortion; OFDM; Power amplifiers; Radio frequency; Radiofrequency amplifiers; Signal analysis; Signal generators; Signal representations; Transmitters;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 2009. VTC Spring 2009. IEEE 69th

Conference_Location

Barcelona

ISSN

1550-2252

Print_ISBN

978-1-4244-2517-4

Electronic_ISBN

1550-2252

Type

conf

DOI

10.1109/VETECS.2009.5073392

Filename

5073392