WiSense Seminar #133, Understanding Small-Cell Wireless Backhaul, Dr. Abdellah Chehri

Title:  Understanding Small-Cell Wireless Backhaul

Abstract: Cellular backhaul has become a very hot topic – and a major focus of attention for mobile operators. The stunning growth in data traffic, coupled with the availability of high-throughput third-generation (3G) and fourth-generation (4G) radio access network (RAN) technologies, has brought backhaul to the fore as the crucial link that ensures that subscriber traffic reliably reaches the core network. Wireless mobile backhaul solutions have traditionally focused on the macro-cell use case scenario where point-to-point microwave links are placed above the urban clutter in a line-of-sight connectivity. Both vendors and mobile operators see small cells as a necessary complement to the macro layer, to provide additional capacity and to improve spectrum utilization. These small cells are placed within the urban clutter where fading (shadow and fast fading) plays a larger role in affecting performance. In this presentation, we provide an overview of the small-cell wireless backhaul and exploring related issues and challenges.

Biography: Dr Abdellah Chehri received his PhD in Electrical Engineering from Laval University, in June 2009. He joined the University of Ottawa as post-doc fellow in July 2009 working under the supervision of Pr Hussein. T. Mouftah. From 2012 to 2014, he was with BLiNQ Networks in Kanata, where he was involved in the development and testing of dual-carrier for NLOS backhaul for small-cell 4G/LTE mobile applications. From 2014 he is working as manager for the next-generation network (NGN)/VoIP & emerging technologies at BELL Canada and adjunct professor at the School of Electrical Engineering and Computer Science of the University of Ottawa. Dr Chehri has published  several research papers and a number of book chapters. He is a Senior Member of IEEE Communications Society, Member of the Order of Engineers of Quebec (OIQ) and IEEE Canadian Humanitarian Initiatives Committee (HIC).

Dr Chehri received a number of prestigious awards, including, Dean’s Scholarship Award, Postdoctoral Studies (University Ottawa), Scholarship Fund to Support Success (Laval University), JSPS, MITACS, NSERC Postdoctoral Fellowship.



WiSense Seminar #132, Medium Access Control for Dynamic Spectrum Sharing and QoS Provisioning in Cognitive Radio Networks, Le Thanh Tan

Title: Medium Access Control for Dynamic Spectrum Sharing and QoS Provisioning in Cognitive Radio Networks

Location: uOttawa, SITE Building (800 King Edward) Room 5084

Abstract: Efficient design of cognitive MAC (CMAC) protocol for cognitive radio networks (CRNs) imposes many new challenges that are not presented in the conventional wireless networks. Because a CMAC protocol must integrate the spectrum sensing function to identify spectrum holes before sharing the available spectrum through a spectrum access mechanism. In this talk, we aim to design, analyze, and optimize CMAC protocols for CRNs under different practically relevant scenarios. Specifically, the first part is related to the design of synchronous CMAC protocols for the half-duplex CRNs whilst the second part involves the engineering of an asynchronous CMAC protocol to full-duplex CRNs. In the former, we investigate the joint MAC and spectrum sensing design under different settings including parallel and sequential spectrum sensing, energy-detection based and cooperative spectrum sensing. In the later, the full-duplex CMAC protocol is designed for the CRNs where secondary users (SUs) can exploit the full-duplex radios to perform sensing and access simultaneously. Therefore, SUs are able to timely detect the primary users’ random reactivation during SUs’ transmissions.

Biography: Le Thanh Tan received the B.Eng. and M.Eng. Degrees from Ho Chi Minh City University of Technology, Ho Chi Minh City, Vietnam, in 2002 and 2004, respectively. He is currently a Ph.D candidate in the Institut National de la Recherche Scientifique-Énergie, Matériaux et Télécommunications, at the Université du Québec. From 2002 to 2010, he was a Lecturer with Ho Chi Minh City University of Technical Education. His research activities include internet of things, time series analysis and dynamic factor models, wireless communications and networking, cognitive radios, statistical signal processing, random matrix theory, compressed sensing, and compressed sampling.


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