Effects of RF-circuit nonlinear distortion on digitally modulated signals in wireless communications

Fu Ling Lin, Shin Fu Chen, Huey Ru Chuang

Research output: Contribution to specialist publicationArticle

4 Citations (Scopus)

Abstract

Computer simulation and measurement of the error vector magnitude (EVM) and adjacent-channel power ratio (ACPR) of a 2.4 GHz MMIC power amplifier (PA) and a 2.4 GHz transceiver RF front end for digital wireless communications are presented. A computer simulation based on π/4-differential quadrature phase-shift keying (DQPSK) modulation with a square-root raised cosine (SRRC) filter is established and EVM and ACPR related to the input power are accurately predicted. The nonlinear effects of the RF circuits are modeled as traditional nonlinearity parameters by which the EVM and ACPR are simulated. Measured results agree with the simulation curves demonstrating that the developed computer simulation program by MATLAB is useful in the design of power amplifiers for digital wireless communications.

Original languageEnglish
Pages126-138
Number of pages13
Volume43
No.9
Specialist publicationMicrowave Journal
Publication statusPublished - 2000 Sep 1

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering

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