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Nonlinear effects of a power amplifier (PA) in communications systems include spectral spreading, which causes adjacent channel interference. For predistorter design, it is crucial to employ a model that can sufficiently model the intermodulation distortion (IMD) caused by the PA. The order of IMD generated by a polynomial is determined by its highest order basis. For a piecewise linear function,...
The majority of the nonlinearity in a communication system is attributed to the power amplifier (PA) present at the final stage of the transmitter chain. In this paper, we consider Gaussian distributed input signals (such as OFDM), and PAs that can be modeled by memoryless or memory polynomials. We derive closed-form expressions of the PA output power spectral density, for an arbitrary nonlinear order,...
Polyspectral techniques are applied to model certain types of nonlinear systems frequently encountered in satellite communications. The power amplifier in such systems is usually operated close to saturation for best efficiency. Current practice is to model the amplifier as a memoryless nonlinearity. Such a model is inadequate if the transponder bandwidth is large. The RF sandwich model is considered...
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