学　术

　　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张蔺、郭承军、李溯琪、杜晓林和Shaddrack Yaw Nusenu分享其研究成果，诚挚邀请感兴趣的师生参加。

　　一、时　间：2018年11月22日（周四）14：00

　　二、地　点：清水河校区经管楼宾诺咖啡

　　三、活动安排：

　　报告一    

　　（1）主题：Deep Reinforcement Learning for Intelligent Modulation and  Coding Scheme Selection in Cognitive Heterogeneous Networks

　　（2）主讲人：张蔺（通信抗干扰技术国家级重点实验室）

　　（3）交流内容：

　　We study a cognitive heterogeneous network (HetNet), in which multiple pairs of secondary users coexist with a pair of primary users on a certain spectrum band. To protect primary transmissions, secondary transmitters (STs) adopt a sensing-based approach to access the spectrum band. Nevertheless, STs may cause uncertain interference to the primary receiver (PR) due to imperfect spectrum sensing, which is particularly significant when the wireless links between the primary transmitter (PT) and STs are extremely weak and the wireless links between STs and the PR are non-ignorable. This makes it difficult for the PR to select a proper modulation and/or coding scheme (MCS). To deal with the issue, we propose an intelligent deep reinforcement learning (DRL) based MCS selection algorithm for the primary transmission. With the proposed algorithm, the DRL agent at the PR is able to learn the pattern of the interference from the STs and predict the interference in the future. Simulation results show that the proposed algorithm can achieve $85\%\sim 100\%$ average transmission rate of the optimal MCS selection scheme, which assumes that the interference from the STs is perfectly known at the PR as prior information. Meanwhile, the achieved average transmission rate of the proposed algorithm is around $100\%$ higher than that of the benchmark algorithm, which selects the MCS without the information about interference.

　　（4）主讲人简介：

　　Lin Zhang received the Bachelor degree in communication engineering from Sichuan University, Chengdu, China, in 2011, and received the Ph.D. degree with the National Key Laboratory of Science and Technology on Communications, in the University of Electronic Science and Technology of China (UESTC), Chengdu, China, in 2017. He is currently a Postdoc in the UESTC. From Oct. 2014 to Apr. 2016, he worked as a Visiting Student with the school of electrical engineering, Royal Institute of Technology (KTH), Sweden. His research interests include cognitive radio, D2D communication, content caching, non-orthogonal multiple access, and short packet communications. He won the IEEE GLOBECOM 2012 Best Paper Award and Travel Grant Award. He received IEEE Region 10 Distinguished Student Paper Award in 2016.

　　报告二

　　（1）主题： 时空一体化背景下的通导遥一体化天基信息实时服务系统

　　（2）主讲人： 郭承军（通信抗干扰技术国家级重点实验室）

　　（3）交流内容：

　　随着国民经济转型发展，中国对导航、遥感等天基信息的需求覆盖范围已从国内拓展到全球；在速度上，对空间信息的获取－传输－处理的响应速度趋向实时化，对海量天基信息的传输－处理－分发的时效性提出了新的要求。但是，目前中国现有的通信、导航、遥感卫星系统自成体系，系统孤立，信息分离，服务滞后，已难以满足用户全球范围及近实时的要求，天基信息服务距市场化和国际化尚有较大差距。要实现天基信息全天时、全天候、全地域服务于每个人的目标，根本上解决现有天基信息系统覆盖能力有限、响应速度慢、体系协同能力弱的问题，亟需构建卫星通信、导航、遥感一体（简称为通导遥一体）的天基信息实时服务系统，即同时提供定位、导航、授时、遥感、通信服务的天基信息实时服务系统。

　　（4）主讲人简介：

　　郭承军，2018年6月获得电子科技大学博士学位，现为电子科技大学通信抗干扰技术国家级重点实验室博士后。主要展开卫星通信、导航、遥感一体的天基信息实施服务系统的研究工作，愿景是在遥感信息精度上，空间分辨率要达到分米级，时间分辨率要达到小时级甚至分钟级；在实时导航定位精度上，要达到分米级；在覆盖范围和通信能力上，要达到覆盖全球的语言、视频和图像通信；在服务能力上，要达到为各类军民用户提供快速、准确、智能化的PNTRC服务，实现各类卫星的系统联通、时空融合、服务畅通的目标。博士后进站之前发表论文120余篇，项目经费过千万。

　　报告三

　　（1）主题：Multi-sensor multi-object tracking with different fields-of-view  

　　（2）主讲人： 李溯琪（信息与通信工程学院 博士后）

　　（3）交流内容：

　　The multi-sensor surveillance system has become increasingly important in a variety of applications ranging from traffic monitoring to battlefield surveillance. A key issue in multi-sensor surveillance is the capability to surveil a much larger region than the field-of view (FoV) of any individual sensor by exploiting cooperation among sensor nodes. Whenever a centralized or distributed information fusion approach is undertaken, this goal cannot be achieved unless a suitable fusion approach is devised. In this talk, a novel approach for dealing with different FoVs within the context of Generalized Covariance Intersection (GCI) fusion will be presented. The approach can be used to perform multi-object tracking on both a centralized and a distributed peer-to-peer sensor network.

　　（4）主讲人简介：

　　李溯琪，电子科技大学，信息与通信工程学院，全职博士后，导师为孔令讲教授。担任IEEE T-SP等国际期刊审稿人。已发表学术论文20余篇，其中第一作者发表信号处理领域顶级国际期刊IEEE transactions on signal processing 3 篇。申请国家发明专利20余项，已授权11项。 2018年度博士后创新人才计划获得者。ISIF 2018 Tammy Blair Best student paper award （国际信息融合协会2018年度最佳学生论文奖）获得者。

　　报告四

　　（1）主题：高多普勒容忍性的波形设计

　　（2）主讲人：杜晓林（信息与通信工程学院 博士后）

　　（3）交流内容：

　　相位编码波形具有形式灵活、自由度高等优点，对于静止目标具有很高的距离和多普勒分辨率。然而对于运动目标具有多普勒敏感性，较小的多普勒频移就会引入较高的距离旁瓣，从而降低了系统的信噪比，不利于目标检测。针对该问题，提出一种局部模糊函数赋形的方法。通过建立合理的优化模型，并逐步将其转化为可求解的问题，提出一种加速迭代序列优化算法。所得波形具有较高的多普勒容忍性。

　　（4）主讲人简介：

　　杜晓林博士毕业于西安电子科技大学，博士期间主要从事MIMO雷达波形优化设计的工作。现为电子科技大学信息与通信工程学院博士后，合作导师为崔国龙教授。目前研究方向是具有高多普勒容忍性的波形设计。

　　报告五

　　（1）主题：Frequency Diverse Array (FDA) Signal Processing: Application in Co-Design Radar-Communication Systems

　　（2）主讲人： SHADDRACK YAW NUSENU（信息与通信工程学院 博士后）

　　（3）交流内容：

　　Recently, the concept of co-design radar and communication has been investigated and several design criteria are considered. Up to date, most of the design criteria of radar and communication integration has so far mainly relied on phased-array or MIMO radar. Both MIMO and phased-array radar achieves high effectiveness in directional steering, but its steering direction is independent of the range parameter. Certainly, the ability to control range-dependent steering also is beneficial for co-design radar and communication applications. Frequency diverse array (FDA) radar is a new array technology and is proposed for radar systems which provides range and angle dependent beampattern as a result of a small frequency increment across the array elements. The range-angle dependent beamforming allows the FDA radar to transmit energy along a specified range or angle dimension. This characteristic can be used to suppress range-dependent clutter and interference which is not accessible for both conventional phased-array radar and MIMO radar systems.

　　（4）主讲人简介：

　　Shaddrack Yaw Nusenu received his Ph.D. in information and communication engineering from University of Electronic Science and Technology of China (UESTC), China, in 2018. He obtained his M. Tech and B. Eng., degrees in Communication Systems and Electronic and Communication Engineering, respectively, in 2011 and 2009 from SRM Institute of Science and Technology, India and All Nations University College, Ghana. He also obtained Higher National Diploma (HND) in Electrical/Electronic Engineering from Cape Coast Technical University in 2004. He has been with Faculty of Engineering, i.e., Electrical/Electronic Department, Koforidua Technical University (KTU), Ghana, as a Lecturer. His area of interests includes frequency array diverse signal processing, undetected radar and wireless communications, wireless physical layer security, antenna array signal processing, spectrum sharing signal processing, cognitive radar techniques, spatial modulation techniques, etc.

　　四、主办单位：电子科技大学博士后管理办公室

　　五、承办单位：信息与通信工程学院

　　　　　　　　　电子科技大学博士后联谊会

　　　　　　　　　　　　　　　　　　　　电子科技大学博士后管理办公室

　　　　　　　　　　　　　　　　　　　　　　　2018年11月19日