Linearization of power amplifiers in wide band communication systems by digital baseband predistortion technique

Abstract : Today, new applications of radio frequencies are designed and proposed to provide more services to users. Spectrum resource becomes increasingly scarce due to an explosion of applications for new services. To achieve higher spectral efficiency, different non constant-envelop modulation techniques have been adopted in modern communication systems. The resulted signals become more sensitive to the nonlinearity presented in the transmission channel, particularly that of the power amplifier (PA). Moreover, in modern communication system, the bandwidth being more and more wider, the memory effects of PAs can no longer be ignored. To achieve higher efficiency, we need to work with average input power close to the compression zone by using additional devices to linearize PAs. The purpose of linearization techniques is to obtain a linear characteristic up to the saturation zone of the PA. One of the most promising techniques is the baseband digital predistortion technique due to its simplicity, flexibility, and reconfigurability. This technique inverts digitally the nonlinearity of the PA in baseband before the PA to get an overall linearized system. The objective of this thesis is to find some efficient baseband predistortion based linearization techniques (fast and simple to implement on digital cards), for the power amplifier with nonlinear memory effects.
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Feng Li. Linearization of power amplifiers in wide band communication systems by digital baseband predistortion technique . Electronics. UNIVERSITE DE NANTES, 2012. English. ⟨NNT : ED503-171⟩. ⟨tel-01104963⟩

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