Power Amplifier Linearization using Hybrid Optimization Techniques

Abstract

The Power amplifier is an indispensable component for the transmitter. Unfortunately, it is nonlinear, when the PA operates around its region of high power efficiency. The functioning of PA is needed to be at its saturation level,for the purpose of getting good energy-efficiency, which generates nonlinear outputs as their outcomes. HPAs are habitually deformed and however shows a tendency to produce the nonlinear outputs, thereby saturation level is forlorn failed to achieved. A new approach is used here in order to rectify the issues due to the non-linear effects in power amplifier operation. Linearization of power amplifier using predistortion technique is our new method. Linearization enables the PA to generate more output power and to operate at a higher efficiency level for the given input. Linearization is a systematic procedure that can be used to reduce the amplifier distortion. A pre-distorter is aptly designed and inserted in front of the PA, to oppose the non-linearization in PA. To model the PA Wiener model is considered and the Hammerstein model is considered to built pre-distorter. To solve the existing problems in the predistorter of power amplifier optimization algorithms such as ABC and PSO are used. Using MATLAB the new approach is simulated and the outputs achieved are analyzed.