Title :
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
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;
Conference_Titel :
Vehicular Technology Conference, 1994 IEEE 44th
Conference_Location :
Stockholm
Print_ISBN :
0-7803-1927-3
DOI :
10.1109/VETEC.1994.345078
