Title :
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
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;
Conference_Titel :
Vehicular Technology Conference, 2009. VTC Spring 2009. IEEE 69th
Conference_Location :
Barcelona
Print_ISBN :
978-1-4244-2517-4
Electronic_ISBN :
1550-2252
DOI :
10.1109/VETECS.2009.5073392
