Title: Physical Layer Aspects of Ultra-Reliable and Low-Latency Communication in 5G Applications and Beyond
Abstract: Massive machine type and low-latency communications are already indispensable use cases of fifth Generation (5G) networks. Low-latency in the order of less than 1ms represents one of the cornerstone prerequisites of the latter cases with applications ranging from remote surgery to virtual reality. Unlike conventional communication realized with large
packets approaching Shannon’s infinite blocklength assumption, the 5G low-latency applications can only be realized in the finite blocklength regime (few hundreds of channel uses, e.g., 100-300 for vehicle-to-vehicle communication). Motivated by the lack of analytical investigation on the impact of practical channel state information (CSI) estimation schemes on the performance of finite blocklength communication, finite blocklength transmission under imperfect CSI will be presented. In this talk, we will highlight the impact of non-ideal CSI on point-to-point wireless data link transmisions and distributed multiple-input multiple outpur (MIMO) communication systems.
Short Bio: Theodoros Tsiftsis was born in Lamia, Greece, in 1970. He received the B.Sc. degree in physics from the Aristotle University of Thessaloniki, Greece, in 1993, the M.Sc. degree in digital systems engineering from the Heriot-Watt University, Edinburgh, U.K., in 1995, the M.Sc. degree in decision sciences from the Athens University of Economics and Business, in 2000, and the Ph.D. degree in electrical engineering from the University of Patras, Greece, in 2006. He is currently a Professor in the School of Intelligent Systems Science & Engineering at Jinan University, Zhuhai Campus, Zhuhai, China. He is also Honorary Professor at Shandong Jiaotong University, Jinan, China. His research interests include the broad areas of cognitive radio, communication theory, wireless powered communication systems, optical wireless communication, and ultra-reliable low-latency communication. Prof. Tsiftsis has been appointed to a 2-year term as an IEEE Vehicular Technology Society Distinguished Lecturer (IEEE VTS DL), Class 2018. Dr. Tsiftsis acts as a Reviewer for several international journals and conferences. He has served as Senior or Associate Editor in the Editorial Boards of IEEE Transactions on Vehicular Technology, IEEE Communications Letters, IET Communications, and IEICE Transactions on Communications. He is currently an Area Editor for Wireless Communications II of the IEEE Transactions on Communications and an Associate Editor of the IEEE Transactions on Mobile Computing.
Title: Array processing and beamforming with Kronecker products
Abstract: The focus of this talk is on array processing and beamforming with Kronecker products. We consider a large family of sensor arrays that enable the decomposition of the steering vector as a Kronecker product of two steering vectors of smaller virtual arrays. Instead of directly designing a global beamformer for the original array, we break it down following the decomposition of the steering vector, and design smaller virtual beamformers separately optimized for each virtual array. This implies smaller matrices to invert, which increases the robustness of the beamformers, and less observations to estimate the statistics when necessary.
We explain how to perform beamforming with Kronecker product filters differently from the well-known and studied conventional approach. We show how to derive fixed, adaptive, and differential beamformers with remarkable flexibility thanks to the Kronecker product formulation. Furthermore, fixed and adaptive beamformers can be combined very intelligently, so that the better of each one of these two approaches is emphasized for performance enhancement. We also address the problem of spatiotemporal signal enhancement, and explain how to perform Kronecker product filtering in this context.
Short Bio: Israel Cohen is a Professor of electrical engineering at the Technion - Israel Institute of Technology, Haifa, Israel. He is also a Visiting Professor at Northwestern Polytechnical University, Xi’an, China. He is an IEEE Fellow "for contributions to the theory and application of speech enhancement", and Distinguished Lecturer of the IEEE Signal Processing Society.
He received the B.Sc. (Summa Cum Laude), M.Sc. and Ph.D. degrees in electrical engineering from the Technion - Israel Institute of Technology, in 1990, 1993 and 1998, respectively. From 1998 to 2001, he was a Postdoctoral Research Associate with the Computer Science Department, Yale University, New Haven, CT, USA. In 2001 he joined the Electrical Engineering Department of the Technion.
He is a coeditor of the Multichannel Speech Processing Section of the Springer Handbook of Speech Processing (Springer, 2008), and a coauthor of Fundamentals of Signal Enhancement and Array Signal Processing (Wiley-IEEE Press, 2018).
He was awarded the Norman Seiden Prize for Academic Excellence (2017), the SPS Signal Processing Letters Best Paper Award (2014), the Alexander Goldberg Prize for Excellence in Research (2010), and the Muriel and David Jacknow Award for Excellence in Teaching (2009).
He served as Associate Editor, IEEE Transactions on Audio, Speech, and Language Processing (2004-2007); Associate Editor, IEEE Signal Processing Letters (2004-2008); Member, Audio and Acoustic Signal Processing Technical Committee (2012-2017); and Member, Speech and Language Processing Technical Committee (2013-2015).
His research interests are array processing, statistical signal processing, deep learning, analysis and modeling of acoustic signals, speech enhancement, noise estimation, microphone arrays, source localization, blind source separation, system identification and adaptive filtering.
Title: Spectrum Modeling of Concurrent Dual-Band Power Amplifier for 5G OFDM-based Signals
Abstract: Dual-band power amplifiers play increasingly important roles in next-generation mobile communication systems, including 5G, but the cross-modulation and out-of-band intermodulation products will introduce more unwanted interference within the passband channels as well as the adjacent channels. Thus, these issues increase the difficulties for engineers in designing concurrent dual-band RF PAs. In our recent research, the nonlinear effects of amplified dual-band orthogonal frequency-division multiplexing (OFDM) signals are analyzed. Furthermore, a spectrum model of the intermodulation, cross-modulation, and out-of-band intermodulation for dual-band OFDM signals in terms of amplifier parameters (such as gain and third-order intercept points [IP3]) is derived. The experimental measurements match the analytical predictions, which is useful to the design and test of concurrent dual-band RF transmitters for RF engineers.
Short Bio: Prof. Fu Li received his B.S. and M.S. degrees in (optical) physics from Sichuan University (China) in 1982 and 1985, respectively, and his Ph.D. degree in electrical engineering from the University of Rhode Island (USA) in 1990. Since then, he has been with Portland State University where he is currently a tenured full professor of Electrical and Computer Engineering.
Prof. Li was an associate editor of the IEEE Transactions on Signal Processing (1993-96) and a column associate editor of the IEEE Signal Processing Magazine (2002). He served on various committees or chapter of IEEE societies either as a member or as the chair. He was also the general chair of the 9th IEEE-SP Workshop on Statistical Signal and Array Processing (SSAP-1998), while he served on numerous conferences as committee member, session chair, and reviewer. He was a guest professor of Sichuan University, Chinese University of Electronic Science and Technology, Beijing Jiaotong University, Shanghai Jiaotong University, Beijing University of Posts and Telecoms.
Prof. Li’s research interests include signal, image, and video processing, as well as wireless, network, and multimedia communications. He has published over one hundred articles in the refereed journals and international conferences. His research work array signal processing and mobile spectrum modeling received hundreds of citations each.
Prof. Li is a Professional Engineer licensed in the State of Oregon. He is a senior member of IEEE and a member of the ETA KAPPA NU (the honor society of electrical engineering). He is a recipient of a number of awards for his technical and professional contributions, which include a Pew Teaching Leadership Award at the Second (US) National Conference on Training and Employment of Teaching Assistants in 1989, and several IEEE awards.