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胡少华、谭腾、赵毅哲分享其研究成果，诚挚邀请感兴趣的师生参加。

　　一、时　间：2022年11月4日（周五）14：15

　　二、地　点：清水河校区科研1号楼 科B302

　　三、主办单位：电子科技大学博士后管理办公室

　　四、承办单位：信息与通信工程学院

　　五、活动安排：

　　报告一：

　　（1）主　题：C波段高速IM/DD光纤传输系统场恢复技术

　　（2）主讲人：胡少华  信息与通信工程学院博士后

　　（3）交流内容：

　　For optical field recovery and linear dispersion compensation, this talk shows a performance-enhanced linearization algorithm, termed adaptive hybrid multi-constraint iteration algorithm (MCIA), which does not require any physical modifications to standard configurations of intensity-modulation and direct-detection (IM/DD) transmission systems. To improve the sensitivity to the residual inter-symbol interference (ISI) effect, we introduce, after fiber backward-propagation, a linear feed-forward equalizer (FFE) pair into the proposed algorithm. To improve the sensitivity to fiber dispersion estimation errors, we utilize a two-stage dispersion estimator coupled with the G-S iteration. After 100-Gb/s PAM-4 signal transmissions over 400-km fibers, the simulation results show that the MCIA offers an 1.5-dB optical signal-to-noise ratio (OSNR) gain and an 1-dB optical power budget improvement compared with the decision-directed data-aided iterative algorithm (DD-DIA), for highly dispersive IM/DD transmissions. By performing adaptive dispersion estimation, the MCIA has higher tolerance to estimation errors in fiber length. Moreover, for cases subject to large dispersion, the usage of the embedded FFE pair not only desensitizes the MCIA on the limited bandwidth effect, but also accelerates the convergence performance for reaching lower BERs. We experimentally demonstrate that the proposed algorithm can support 150-Gb/s PAM-4 transmissions over 25-km standard single mode fibers (SSMF), where just a 7-tap FFE-pair is required. For 150 Gb/s transmissions, the tolerance to fiber length estimation error is increased from 0.9 km to 20 km.    

　　（4）主讲人简介：

　　Shaohua Hu is a post-doc majored in signal processing. She obtained bachelor’s degree in communication engineering in UESTC, then performed PhD research in communication and information systems and advised by Prof. Kun Qiu in UESTC. Her research interests include High speed optical transmission system design&analysis and communication signal processing.  

　　报告二：

　　（1）主　题：功能化孤子光频梳器件

　　（2）主讲人： 谭腾  信息与通信工程学院博士后 

　　（3）交流内容：

　　光学频率梳是一种宽谱的相干光源，由一系列等频率间隔的离散谱线组成，具有超高的时频精度，是人类迄今为止研发的最精密光源，荣获2005年诺贝尔物理学奖。自诞生以来，光学频率梳为精密光谱学、光学测量、相干光通信、光时钟、微波光子学等多个领域的发展带来了革命性的变化，具有巨大的应用前景。随着应用范围的拓展和需求的提升，频梳的功能化实现是未来频梳器件走向应用的重要发展方向。本报告将从光频梳的特性与应用出发，重点介绍报告人在功能化孤子光频梳器件方向的研究成果。

　　（4）主讲人简介：

　　谭腾，电子科技大学信息与通信工程学院师资博士后，2022年国家“博新计划”入选者。2017获西南交通大学通信工程专业学士学位，2022年获电子科技大学通信与信息系统专业博士学位。作为第一作者或通讯作者在《自然通讯》、《光：科学与应用》等期刊以及CLEO、OFS等会议发表学术论文17篇；作为核心成员参与科技部重点研发课题、自然基金项目、国家实验室重点项目等7项。主要研究方向为光纤传感核心器件。

　　报告三：

　　（1）主　题：Joint Interleaver and Modulation Design For Multi-User SWIPT-NOMA

　　（2）主讲人：赵毅哲  信息与通信工程学院博士后

　　（3）交流内容：

　　Radio frequency (RF) signals can be relied upon for conventional wireless information transfer (WIT) and for challenging wireless power transfer (WPT), which triggers the significant research interest in the topic of simultaneous wireless information and power transfer (SWIPT). By further exploiting the advanced non-orthogonal-multiple-access (NOMA) technique, we are capable of improving the spectrum efficiency of the resource-limited SWIPT system. In our SWIPT system, a hybrid access point (H-AP) superimposes the modulated symbols destined to multiple WIT users by exploiting the power-domain NOMA, while WPT users are capable of harvesting the energy carried by the superposition symbols. In order to maximise the amount of energy transferred to the WPT users, we propose a joint design of the energy interleaver and the constellation rotation based modulator in the symbol-block level by constructively superimposing the symbols destined to the WIT users in the power domain. Furthermore, a transmit power allocation scheme is proposed to guarantee the symbol-error-ratio (SER) of all the WIT users. By considering the sensitivity of practical energy harvesters, the simulation results demonstrate that our scheme is capable of substantially increasing the WPT performance without any remarkable degradation of the WIT performance.

　　（4）主讲人简介：

　　Yizhe Zhao received the Ph.D. degree from School of Information and Communication Engineering in University of Electronic Science and Technology of China (UESTC), where he won the most outstanding student award. He holds a post-doctoral position with UESTC. He has also been a Visiting Researcher with the Department of Electrical and Computer Engineering, University of California, Davis, USA. He serves for China Communications as the guest editor of the special issue ``Energy Self-Sustainability in 6G''. He is also a TPC member of several prestigious IEEE conferences, such as IEEE ICC. His research interests include wireless communications and resource management for B5G and 6G, wireless information and energy provision, joint communication and control.

                                                                                   电子科技大学博士后管理办公室

                                                                                               2022年10月31日