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QUANTIFYING AND CANCELLATION MEMORY EFFECT IN HIGH POWER AMPLIFIER FOR OFDM SYSTEMS

By H. Karkhane, A. Ghorbani, and H. R. Amin Davar

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Abstract:
This paper is concerned with a new time-domain modeling topology for signals which is appliedto OFDM systems. This model is a more accurate based on Wiener approach. Also the memory effect will be shown using two-tone intermodulation distortion (IMD) measurement with different tone frequency spacing and power levels. Next adaptive predistorter to counterbalance the AM/AM andAM/PM nonlinear effects of the transmitter power amplifier is proposedb y Hammerstein approach. Finally we consider the effectiveness of proposedmetho don performance of OFDM signal as the wideband system by reduction of distortion. It is confirmed by computer simulation that proposedapproac h produces a faster convergence speed than the previous adaptive predistortion technique.

Citation:
H. Karkhane, A. Ghorbani, and H. R. Amin Davar, "Quantifying and Cancellation Memory Effect in High Power Amplifier for OFDM Systems," Progress In Electromagnetics Research C, Vol. 3, 183-194, 2008.
doi:10.2528/PIERC08041201

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