A Comparative Analysis of Power Amplifier Types in Massive MIMO Systems for 5G Networks.
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Date
2025-03
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Addis Ababa University
Abstract
Class AB, Doherty, and Envelope Tracking Power Amplifiers (ETPA) are the three types of
power amplifiers that are thoroughly compared in this thesis in the context of 5G networks.
Current communication standards require power amplifiers to achieve high efficiency over increasingly
larger dynamic ranges and bandwidths while maintaining strict linearity criteria.
The study uses key criteria like power-added efficiency, linearity, gain, and output power to
evaluate their performance. Simulations were conducted using MATLAB and the Advanced
Design System to evaluate amplifier properties under various settings, including the use of
Digital Pre-Distortion to improve nonlinearity. The results showed that Class AB amplifiers
achieved PAE of 51.090 % and improved AMAM Conversion. Excellent back-off efficiency and
significant advantages in high-power scenarios are exhibited by Doherty amplifiers, especially
when DPD integration is employed for enhanced linearity. Despite achieving 70% PAE and
demonstrating superior efficiency over a broad dynamic range, envelope tracking amplifiers
require complex design due to their reliance on dynamic voltage control. By balancing the
trade-offs between linearity and efficiency, this study determines the optimal amplifier topologies
for 5G networks that are both high-performance and energy-efficient. These discoveries
contribute to the advancement of the technology by revealing the future applications of power
amplifiers in wireless communication systems.
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Keywords
Envelope Tracking PA, Doherty PA, Fifth generation, efficiency, Gain, linearity, Output Power, Digital Pre-Distortion, massive MIMO, Power Amplifiers