Title :
Demystifying Envelope Tracking: Use for High-Efficiency Power Amplifiers for 4G and Beyond
Author_Institution :
Microsoft Mobile (China) Investment Co., Ltd., Beijing, China
Abstract :
The efficiency of a radio-frequency (RF) power amplifier (PA) is generally defined as the ratio between the desired transmitted radio power and the total power from a power supply, which is rather low in average with modern high peak-to-average-power-ratio (PAPR) signals, as illustrated in Figure 1(a). Consequently, a small improvement in the efficiency of the RF PA can have substantial benefits for a wireless system and cut the overall costs of system operations.
Keywords :
4G mobile communication; radiofrequency power amplifiers; 4G-and-beyond wireless system; PAPR signal; RF PA efficiency; desired transmitted radio power; envelope tracking; high-efficiency power amplifiers; peak-to-average-power-ratio signal; power supply; radio-frequency power amplifier; 4G mobile communication; Bandwidth; Heating; Hybrid power systems; Modulation; Peak to average power ratio; Power amplifiers; Radio frequency; Transmitters;
Journal_Title :
Microwave Magazine, IEEE
DOI :
10.1109/MMM.2014.2385351
