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  • Date and Time: Thursday, 26th Nov 2015    16:00 hrs - 17:15 hrs

    Venue: Department of Computer Science, COMSATS Institute of Information Technology, 1.5 KM Defence Road ,Off Raiwind Road, Lahore

    (Focal Person: Dr. Farooq Ahmad)

    Speaker: Dr. Omer Waqar (Assistant Professor, Electrical Engineering Department, UET and KICS, Lahore.)



    It is generally considered that the multi-hop relay networks can overcome the pathloss and hence has the ability to achieve higher energy efficiency. However, this conjecture is not completely true when the circuit power consumption and/or delay constraints are considered. In this talk, certain scenarios will be presented under which multi-hop relay networks are more energy efficient in comparison with the single-hop networks. Apart from these scenarios, it will be better to employ single-hop networks in order to achieve the higher energy efficiency. Moreover, it will be shown that the joint optimization of the number of relays and the constellation size (when the error probability is the desired performance metric) results in more energy savings. As an example, up to 55% energy savings are possible when the optimized relay networks will be deployed.

    Harvesting energy from the ambient RF signals can increase the battery-life of relay networks (e.g. in sensor networks). Therefore, the battery-free relay networks may be possible to deploy in future (e.g. for 5G systems) if the efficiency of wireless harvesting technique will be increased. In the last part of the talk, state-of-the art methods will be described which can be used potentially for wireless energy harvesting. The work which is being carried out by the researchers all over the world related to this field will be discussed. The talk will be ended with some conclusions and follow-up discussion about the future work.

    Speaker’s Biography:

    Dr. Omer Waqar received the B.Sc. degree in Electrical Engineering from the University of Engineering and Technology (UET), Lahore in 2007 and the Ph.D. degree in Electrical and Electronic Engineering from the University of Leeds, Leeds, U.K. in November 2011 respectively. From January 2012 to July 2013, he was a Research Fellow with the Center for Communications Systems Research (CCSR) and 5G Innovation Center (5GIC), University of Surrey, Guildford, U.K. He currently serves as an Assistant Professor at the Department of Electrical Engineering and Al-Khawarizmi Institute of Computer Science (KICS), UET, Lahore. His current research interests include energy-efficient design of fifth-generation (5G) wireless access networks, performance analysis of multihop relay networks, and cooperative communication systems, particularly base-station cooperation or coordinated multipoint communications. He has published various IEEE research papers including IEEE transactions and is a member of IEEE.