Computer simulation of nonlinear effects of RF power amplifiers based on EVM and ACPR for digital wireless communications

Author

Lin, Fu-Ling ; Chen, Shin-Fu ; Chuang, Hucy-Ru

Author_Institution

Dept. of Electr. Eng., Nat. Cheng Kung Univ., Tainan, Taiwan

Volume

36

Issue

1

fYear

2000

fDate

1/6/2000 12:00:00 AM

Firstpage

77

Lastpage

79

Abstract

A computer simulation scheme of the error vector magnitude (EVM) and the adjacent channel power ratio (ACPR) of RF power amplifiers (PAs) for digital wireless communications is presented. By using digital signal processing techniques and a time-domain approach, the EVM and ACPR related to the input power can be accurately predicted. The nonlinear effects of the MMIC PA are modelled as the traditional nonlinearity parameter, the third-order intercept point (IP3), which is used to simulate the EVM and ACPR. A computer simulation based on π/4-DQPSK modulation with a square-root raised cosine (SRRC) filter was carried out for this study. A standard NADC modulated signal from an HP ESG-D E4433B signal generator was applied to the PA and the output signal analysed by an HP 89410A vector signal analyser. The measured data agree well with the simulation results

Keywords

MMIC power amplifiers; adjacent channel interference; digital radio; mobile radio; quadrature phase shift keying; time-domain analysis; π/4-DQPSK modulation; ACPR; EVM; MMIC PA; RF power amplifiers; adjacent channel power ratio; digital wireless communications; error vector magnitude; nonlinear effects; nonlinearity parameter; signal generator; square-root raised cosine filter; third-order intercept point; time-domain approach; vector signal analyser;

fLanguage

English

Journal_Title

Electronics Letters

Publisher

iet

ISSN

0013-5194

Type

jour

DOI

10.1049/el:20000048

Filename

830532