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Digital Predistortion Technique Using Kernel Adaptive Algorithm for Nonlinear Power Amplifier

This paper proposes the kernel adaptive filtering algorithm for digital predistortion in nonlinear power amplifier. The Saleh’s PA model is considered to describe the AM/AM and AM/PM conversion. Three algorithms, i.e., complex least means squares algorithm (CLMS), complex recursive least squares algorithm (CRLS), and complex kernel least means squares (CKLMS) algorithms, are developed to achieve better performance in terms of convergence rate and quality of solution. The proposed techniques are verified using QPSK modulation. The power spectral density, mean square error (MSE) and constellation plot are simulated and compared to verify the performances.