The effect of data modulation format on intermodulation power in nonlinear amplifiers

Author

Cavers, James K.

Author_Institution

Sch. of Eng. Sci., Simon Fraser Univ., Burnaby, BC, Canada

fYear

1994

fDate

8-10 Jun 1994

Firstpage

489

Abstract

The paper presents a quick and accurate method for calculating the total intermodulation (IM) power at an amplifier output as a function of the modulation format and the amplifier nonlinearity. Although it does not give the spectral distribution, it does not require lengthy simulations. First, each modulation is characterized by the probability density function (pdf) of its instantaneous power. Next the candidate amplifiers are represented by their measured AM/AM and AM/PM characteristics (low degree polynomials are not required). In an application of linear estimation principles, a simple numerical integration gives the IM power resulting from any combination of modulation and amplifier

Keywords

data communication equipment; integration; intermodulation distortion; power amplifiers; quadrature amplitude modulation; quadrature phase shift keying; radio transmitters; AM/AM characteristics; AM/PM characteristics; amplifier nonlinearity; amplifier output; data modulation format; instantaneous power; intermodulation power; linear estimation principles; low degree polynomials; modulation format; nonlinear amplifiers; numerical integration; probability density function; Data engineering; Density functional theory; Interference; Intermodulation distortion; Modulation; Nonlinear distortion; Polynomials; Power amplifiers; Power control; Power engineering and energy;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 1994 IEEE 44th

Conference_Location

Stockholm

ISSN

1090-3038

Print_ISBN

0-7803-1927-3

Type

conf

DOI

10.1109/VETEC.1994.345078

Filename

345078