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为搭建我校博士后之间的学术交流平台，促进学术水平提升，学校博士后管理办公室组织开展博士后学术沙龙活动。本次沙龙由我校博士后刘颖、刘婧和杨海宁分享其研究成果，诚挚邀请感兴趣的师生参加。
一、时 间：2016年10月31日（周一）14：30
二、地 点：清水河校区经管楼宾诺咖啡
三、主办单位：电子科技大学博士后管理办公室
四、承办单位：电子工程学院
电子科技大学博士后联谊会
五、活动安排：
报告一：
（1）主题：Digital Predistortion Technique for Wireless Communication System of Wide Bandwidth
（2）主讲人：刘 颖 电子工程学院博士后
（3）交流内容：
Abstract-Digital predistortion (DPD) is one of the most effective techniques to mitigate the power amplifier (PA) nonlinear distortion. The DPD feedback bandwidth is often restricted by the nonideal electronic components, e.g., the anti-aliasing filter, which introduces bandwidth mismatch between model basis function and feedback signal thus degrades the linearization performance. This paper presents a new DPD solution for wideband PA systems with constrained feedback bandwidth. By including a linear operation into the PA identification, the PA model can be accurately estimated. Subsequently, the DPD parameters are extracted using the PA model estimated output and PA input signal by applying indirect learning algorithm. Experiments demonstrate a 23-dB adjacent channel leakage ratio improvement is acquired on a 100-MHz Long Term Evolution-advanced signal with the feedback bandwidth reduced from 500 MHz to 140 MHz
（4）主讲人简介：
Ying Liu received the B.E. and the M.S. degrees in communication engineering, and the Ph.D. degree in communication and information system from the University of Electronic Science and Technology of China (UESTC) in 2008, 2011, and 2016 respectively. He had also worked as a visiting scholar in the department of Electrical and Computer Engineering at Ohio State University (OSU), Columbus, U.S. He is currently a postdoctoral researcher at the school of electronic engineering of UESTC. His research interests include nonlinear modeling, digital predistortion, full duplex communications, and signal processing in wireless communications.
报告二：
（1）主 题：空间等离子与航天器相互租用
（2）主讲人：刘 婧 物理电子工程学院博士后
（3）交流内容：
空间同步轨道上多能电子辐照聚合物充电过程及其充电特性的研究是空间技术、空间功能材料科学、空间辐照防护技术、通信卫星故障机理和航天器安全运行方面的一个重要研究课题。空间中几乎到处存在着等离子体，空间中的电子辐照航天器聚合物形成电荷积累到一定程度引起的静电放电(Electrostatic Discharge, ESD)是导致航天器故障的重要成因之一。另一方面，多能电子辐照聚合物引起静电放电可导致聚合物材料性能退化和通过电磁脉冲干扰电子系统从而危害航天器安全。
（4）主讲人简介：
Jing Liu received the Bachelor Degree and Ph.D degrees from xidian University and Xi`an Jiaotong University, china, in 2005 and 2014, respectively. She currently works as a Postdoctoral Fellow in the School of Institute of physical electronics, UESTC. Her research interests include Monte Carlo modeling, the research of polymer, Spatial interaction between plasma and spacecraft.
报告三：
（1）主 题：Subsurface Target Imaging with Borehole Radar
（2）主讲人：杨海宁 电子工程学院博士后
（3）交流内容：
As a novel and promising geophysical detection technique, borehole radar systems have been widely used in many areas of human production and life, which has arisen the attention all over the world. Different from conventional ground penetrating radar systems, borehole radar systems have their unique working modes and environments. In the practical borehole surveys, there are problems such as the oversized sample set using impulse signals, the bistatic borehole radar imaging that do not follow the exploding reflector model assumption, the low efficiency of imaging with nonuniform samples and poor precision of target imaging in nonuniform layered media. In this exchange, I will introduce some borehole radar imaging techniques. That is,
1. A novel efficient imaging method of bistatic borehole radar.
2. A novel borehole radar imaging method based on nonuniform-fast-Fourier-transform.
3. A time-gating-based reverse time migration method for borehole radar imaging.
（4）主讲人简介：
Haining Yang is a post-doc majored in signal processing. He obtained his PhD degree in signal processing at UESTC. He is now doing post-doc research at School of Electronic Engineering in UESTC. His research interests include radar signal processing, radar system, digital communication.
电子科技大学博士后管理办公室
2016年10月21日
编辑：林坤 / 审核：林坤 / 发布：一戈
