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Analysis of Nonlinearity of RF Amplifier and Back-Off Operations on the Multichannel Wireless Transmission Systems.  

신동환 (경남대학교 정보통신공학과)
정인기 (경남대학교 정보통신공학과)
이영철 (경남대학교 정보통신공학과)
Publication Information
Journal of the Korea Institute of Information and Communication Engineering / v.8, no.1, 2004 , pp. 18-27 More about this Journal
Abstract
In this paper, we presents an analytical simulation procedure for evaluation in baseband digital modulated signals distortions in the present of RF power amplifier(SSPA) nonlinear behavior and backoff operations of OFDM wireless transmission system. we obtained the optimum nonlinear transfer function of designed SSPA with the SiGe HBT bias currents of OFDM multi-channel wireless transmission system and compared this transfer function to SSPA nonlinear modeling functions mathematically, we finds optimum bias conditions of designed SSPA. With the derived nonlinear modeling function of SSPA, We analysed the PSD characteristics of in-band and out-band output powers of SSPA EVM measurement results of distorted constellation signals with the input power levels of SSPA. The results of paper can be applied to find the SSPA linearly with optimum bias currents and determine the SSPA input backoff bias for AGC control circuits of SSPA.
Keywords
Power Amplifier; linearity; OFDM; Backoff; SSPA Nonlinearity;
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