A novel distortion elimination method of power amplifier in wideband OFDM system

Power Amplifier Modeling and Power Amplifier Predistortion in Ofdm System

This paper presents a baseband predistorter to be used in OFDM systems operating with a nonlinear high power amplifier (HPA). Key features of the predistorter reside in the use of the HPA inverse structure as nonlinear distortion compensator. The performance of the compensated system is analyzed by simulations in an AWGN environment. The receiver also needs furthermore an equalizer in order to ...

Wideband Low Distortion, High Gain Operational Amplifier

The OPA643 provides a level of speed and dynamic range previously unattainable in a monolithic op amp. Using a de-compensated voltage feedback architecture with two internal gain stages, the OPA643 achieves exceptionally low harmonic distortion over a wide frequency range. The "classic" differential input provides all the familiar benefits of precision op amps, such as bias current cancellation...

Hyper-wideband Ofdm System

A novel wideband 140 GHz gyrotron amplifier

The theory, design and experimental results of a wideband 140 GHz, 1 kW pulsed gyro-traveling wave amplifier are presented. The gyro-TWA operates in the HE(0,6) mode of a novel cylindrical confocal waveguide using a gyrating electron beam. The electromagnetic theory, interaction theory, design processes and experimental procedures have been described in detail. The experiment has produced over ...

High Power Amplifier Effects Analysis for OFDM System

1119 All Rights Reserved © 2013 IJSETR  Abstract— In wireless communication systems, the design and analysis of an orthogonal frequency division multiplexing (OFDM) system signal is highly affected by the nonlinear effects of high power amplifier (HPA). The nonlinear effects of HPA on the OFDM system are the most critical because it is not only reducing the system performance but also creates ...