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A Design of Predistortion Linearizer Controlling Modified Individual Order IM Signal  

김영 (금오공과대학교 전자공학부)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.41, no.10, 2004 , pp. 97-102 More about this Journal
Abstract
In this paper, a new predistorter controlling modified individual order jntermodulation distortion signals is proposed. The proposed predistorter generates and controls predistorted third and high order IM signals independently. Using predistorted signals, jntermodulation distortion signals of power amplifier are suppressed effectively. The predistortion linearizer has been implemented to operate in Korean PCS basestation transmitting band (1840～1870MHz). The test results show that IMD3 and IMD5 (C/I) of power amplifier are improved more than 40dB and 23dB for CW two tone signals, respectively. The predistorter improves the adjacent channel power ratio (ACPR) more than 10dB at 885KHz offset point for CDMA (IS-95) signals.
Keywords
Predistortion; lineariaer; individual order; power amplifier;
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