Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Modeling Nonlinear Power Amplifiers in OFDM Systems from Subsampled Data: A Comparative Study Using | EURASIP Journal onApplied Signal Processing 2003 12 1219-1228 2003 Hindawi Publishing Corporation Modeling Nonlinear Power Amplifiers in OFDM Systems from Subsampled Data A Comparative Study Using Real Measurements Ignacio Santamaria Communications Engineering Department DICOM University of Cantabria Avda. Los Castros s n 39005 Spain Email nacho@ Jesus Ibanez Communications Engineering Department DICOM University of Cantabria Avda. Los Castros s n 39005 Spain Email jesus@ Marcelino Lazaro Communications Engineering Department DICOM University of Cantabria Avda. Los Castros s n 39005 Spain Email marce@ Carlos Pantaleon Communications Engineering Department DICOM University of Cantabria Avda. Los Castros s n 39005 Spain Em ail carlos@ Luis Vielva Communications Engineering Department DICOM University of Cantabria Avda. Los Castros s n 39005 Spain Email luis@ Received 19 April 2002 and in revised form 20 February 2003 A comparative study among several nonlinear high-power amplifier HPA models using real measurements is carried out. The analysis is focused on specific models for wideband OFDM signals which are known to be very sensitive to nonlinear distortion. Moreover unlike conventional techniques which typically use a single-tone test signal and power measurements in this study the models are fitted using subsampled time-domain data. The in-band and out-of-band spectral regrowth performances of the following models are evaluated and compared Saleh s model envelope polynomial model EPM Volterra model the multilayer perceptron MLP model and the smoothed piecewise-linear SPWL model. The study shows that the SPWL model provides the best in-band characterization of the HPA. On the other hand the Volterra model provides a good trade-off between model complexity number of parameters and performance. Keywords and phrases nonlinear modeling high-power amplifiers OFDM signals
