The Impact of Long Term Memory Effects in Wireless QPSK Modulated Signals

Author

Santos, Rui Estanqueiro ; Carvalho, Nuno Borges ; Gard, Kevin

Author_Institution

Univ. de Aveiro, Aveiro

fYear

2007

fDate

3-8 June 2007

Firstpage

961

Lastpage

964

Abstract

This paper studies the impact of power amplifiers, PA, long term memory effects in QPSK modulated signals. To quantify the memory effects an expansion of the nonlinear distortion behavior of the PA is obtained. Both the co-channel and adjacent distortion are calculated. It is then showed that the co-channel and adjacent channel distortion are significantly affected by the long term memory effects, which implies a rise in the EVM figures. The theoretical results are further compared with CAD/CAE simulations and measurements.

Keywords

power amplifiers; quadrature phase shift keying; radio access networks; CAD/CAE simulations; EVM figures; adjacent channel distortion; co-channel channel distortion; long term memory effects; nonlinear distortion; power amplifiers; wireless QPSK modulated signals; Bandwidth; Degradation; Distortion measurement; Memoryless systems; Multiaccess communication; Nonlinear distortion; Nonlinear systems; Power amplifiers; Quadrature phase shift keying; Signal to noise ratio; Long term memory; Nonlinear systems; Power Amplifiers;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Symposium, 2007. IEEE/MTT-S International

Conference_Location

Honolulu, HI

ISSN

0149-645X

Print_ISBN

1-4244-0688-9

Electronic_ISBN

0149-645X

Type

conf

DOI

10.1109/MWSYM.2007.380178

Filename

4263984