Open AccessPredicting the Power Spectrum of Amplified OFDM Signals Using Higher‐Order Intercept Points
Author(s) -
YAN Siyuan,
YANG Xianzhen,
WANG Xiaoru,
LI Fu
Publication year - 2022
Publication title -
chinese journal of electronics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.267
H-Index - 25
eISSN - 2075-5597
pISSN - 1022-4653
DOI - 10.1049/cje.2020.00.299
Subject(s) - orthogonal frequency division multiplexing , amplifier , passband , wireless , electronic engineering , rf power amplifier , computer science , nonlinear distortion , modulation (music) , radio frequency , transmission (telecommunications) , telecommunications , channel (broadcasting) , engineering , bandwidth (computing) , physics , band pass filter , acoustics
Orthogonal frequency‐division multiplexing (OFDM) has been developed into a popular modulation scheme for wireless communication systems, used in applications such as LTE and 5G. In wireless communication systems, nonlinearity caused by radio frequency (RF) amplifiers will generate distortions to both passband and adjacent channels such that the transmission quality is degraded. The study of this article aims to predict the power spectrum for OFDM based signals at the output of an RF amplifier due to the nonlinearity. In this article, based on Taylor polynomial coefficients, a power spectrum expression for amplified OFDM signals in terms of intercept points (up to n th‐order) is derived. This model is useful to RF engineers in choosing and testing RF amplifiers with appropriate specifications, such as intercept points and gain, to meet the requirements of wireless standards. Measurements are carried out to confirm the results of the proposed model.