中文摘要：

Jing Li, is currently working toward the Ph.D. degree in electronic engineering at Tsinghua University. Her current research interests include high efficiency P,F PA design and linearity of RF PA. The corresponding author, email： chenwh@tsinghua.edu.cn.Wenhua Chen, associate professor with the Department of Electronic Engineering, Tsinghua University His current research interests include power-efficiency enhancement for wireless transmitters, PA predis- tortion and smart antennas. Qian Zhang. is currently working toward the M.S. degree in electronic engineering from Tsinghua University. His research interests include linearity of RF PA and 5G transmitting system