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Compensation of the Nonlinearity of the High-Power Amplifiers with Memory Using a Digital Feedforward Scheme  

Kim, Min (Chungnam National University)
Shin, Ha-Yeon (ARTECH)
Eun, Chang-Soo (Chungnam National University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.49, no.4, 2012 , pp. 9-17 More about this Journal
Abstract
In this paper, we show the memory effect of the high-power amplifiers for wied-band signals, present a compensation method for the nonlinearity combined with memory effect, and analyze its performance. For the modeling and the compensation of the nonlinear high-power amplifier with memory effect, we investigate the Volterra series model, the Wiener model, and the Hammerstein model. As a compensator scheme, we propose a digital feedforward technique. Compared to analog feed-forward scheme, the proposed scheme has better stability and adaptability to the environmental changes. It has a simpler structure than the conventional digital nonlinear compensation schemes. The result of computer simulations using ADS of the Agilent shows that spectral re-growth is suppressed by more than 20 dB, which amounts to at least 10 dB back-off. Considering the compensation performance, implementation complexity, and convergence rate, we could conclude the Wiener model is most suitable for the proposed scheme.
Keywords
feedforward; compensation; Volterra series model; Wiener model; Hammerstein model;
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