Abstract
Orthogonal frequency division multiplexed OFDM signals have high peak-to-average power ratio PAPR which results in excessive nonlinear distortion when amplified by power amplifiers PA and hence, reduction in system signal-to-noise SNR and spectral efficiency. Clipping has been one of the most popular and low-cost technique for reducing the PAPR of OFDM signals. The overall spectral efficiency of an OFDM system that involves clipping depends on the combined response of the cascade of clipper-amplifier and not only on the response of the clipper. In this article, the performance of clipped and nonlinearly amplified OFDM signals is studied. The combined response of a clipper-amplifier cascade is obtained using an orthogonalized behavioral model which enables in-band and out-of-band nonlinear distortions to be accurately predicted without using the Gaussian assumption of signal statistics. Furthermore, different clipping characteristics are studied where it is shown that the overall nonlinear distortion, and hence the overall SNR, is highly dependent on the type of clipping characteristics and the clipping ratio. Simulation results are verified by Simulink measurement model which uses measured amplifier characteristics in a General Amplifier block. © 2014 Wiley Periodicals, Inc. Int J RF and Microwave CAE 24:656-664, 2014.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: International Journal of RF and Microwave Computer-Aided Engineering
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
