In this paper we present a modified model of solid state power amplifiers. Also using the mathematical concept of best approximation in Hilbert spaces, a predistorter structure is suggested to compensate both AM/AM and AM/PM conversion characteristics of a solid state power amplifier. To verify the effects of this linearization we generally consider it in a QAM signal transmission in an additive white Gaussian noise channel and the results are compared with the ideal linear case. It is shown that the presented method is able to compensate the nonlinearity up to a good extent. The performance of proposed method has been analyzed in frequency domain through spectrum simulations. To prove the validity of presented method we have made similar considerations on continuous spectrum.
This paper presents a novel polynomial expansion technique for solid state power amplifier (SSPA) linearization. We present a new nonlinear compensation method for AM/AM and AM/PM conversion characteristics which is applicable in other nonlinear systems. The effect of this linearization is considered in the performance of 64-and 256-level QAM signal transmission in an Additive White Gaussian Noise (AWGN) channel.
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