Wantao Li received the Ph.D. degree in signal theory and telecommunication in Universitat Politècnica de Catalunya (UPC). His research interests include efficient amplifier and power supply systems, including PA linearization algorithms and the implementations. He is currently working on the RF front-end module (FEM) systems for handsets with the RFIC Department in Huawei Hisilicon.
Abstract:
Title: Energy-Efficient RF Frontend System for Handset Applications
The proliferation of frequency bands and the demand for wider bandwidth in modern wireless systems (5G/6G, Wi-Fi) impose severe challenges on the design of the Radio Frequency (RF) Front-End Module (FEM).
The talk focus on the transmitter (Tx) chain, particularly the PA design and its system-level implementation. We will review advanced PA architectures (e.g., Doherty, Envelope Tracking) and system-level power-saving techniques such as Average Power Tracking (APT) and ET. A critical discussion on PA linearization will be presented, emphasizing the development of low-complexity, resource-constrained models for mobile terminals, the impact of fixed-point arithmetic, and the need for online adaptive algorithms to cover all operational scenarios.
Finally, we provide an in-depth analysis of the Envelope Tracking PA (ETPA). This section covers its operational principles, practical application performance, and the primary challenges related to linearity, bandwidth limitations, and the effective efficiency range. This work aims to offer a comprehensive overview of the state-of-the-art in FEM and PA design for contemporary communication systems.
