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A Study on the Method to Satisfy the 2-Tone and CDMA Intermodulation Distortion Characteristics Simultaneously  

안효성 (금오공과대학교 전파통신공학과)
조숙희 (금오공과대학교 전파통신공학과)
황문수 (금오공과대학교 전파통신공학과)
서태환 (금오공과대학교 전파통신공학과)
김병철 (금오공과대학교 전파통신공학과)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.14, no.10, 2003 , pp. 1011-1016 More about this Journal
Abstract
In this paper, we investigate the relationship between the intermodulation signal of 2-tone and CDMA spurious emission of HPA. And confirm that the fifth IMD signal of HPA has more important effect upon CDMA ACPR characteristics than the third IMD signal. We present the method for the power amplifier to satisfy the 2-tone and CDMA specification simultaneously, and that is to use the predistorter for improving the third IMD signal of 2-tone for the power amplifier which is tuned to satisfy the CDMA specification and not to satisfy the 2-tone specification. The result by using the method which is presented from this paper shows that the ACPR is improved about 2 dB for CDMA 1FA(frequency allocation) signal and the third IMD signal is improved about 20 dB for CW 2-tone signals and we confirmed the specification is satisfied simultaneously.
Keywords
ACPR; Intermodulation Distortion; High Power Amplifier; Predistortion;
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