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ECE Public Research Lecture
Thursday, September 28, 2017
1:00 PM - 2:00 PM

TEB 234

Ping Wang, PhD

Nanyang Technological University




Thursday September 28, 2017

1:00 p.m.

Room 234, Thompson Engineering Building

Western University


Ambient Backscatter: A New Approach to Improve Network Performance for RF-Powered Cognitive Radio Networks”




Cognitive radio is an intelligent radio network which aims to utilize spectrum more efficiently. With the development of radio frequency (RF) energy harvesting techniques, a new type of network has been introduced, i.e., an RF-powered cognitive radio network (CRN). However, the performance of RF- powered CRNs depends largely on the amount of harvested energy and the primary channel activity.  Recently, ambient backscatter communication has been introduced, which enables users to transmit data by backscattering ambient signals. In this talk, we will introduce a novel concept of integrating ambient backscatter communication into RF-powered CRNs with the aim of improving the performance of the secondary system in terms of the overall data transmission rate. An important question to answer is how to choose the best mode, i.e., the harvest-then-transmit mode or backscatter mode, given the current radio conditions. To this end, we formulate and solve optimization problems to find an optimal transmission policy for the secondary system. Moreover, we analyze and evaluate the performance of the secondary system under different scenarios. Through the numerical results, we demonstrate that by integrating ambient backscatter communication into the RF-powered CRN, the performance of the secondary system can be significantly enhanced. Additionally, we reveal some insights which can be used as a benchmark for implementing such two transmission techniques (i.e., harvest-then-transmit and ambient backscatter) for secondary systems.


Ping Wang (M’08, SM’15) received the B.Sc. and M.Sc. degrees in electrical and information engineering from Huazhong University of Science and Technology, China, in 1994 and 1997, respectively, and the PhD degree in electrical and computer engineering from University of Waterloo, Canada, in 2008.  Since June 2008, she has been with the School of Computer Science and Engineering, Nanyang Technological University, Singapore, where she is currently an Associate Professor. Her research  interests span several areas including wireless communications and networking, cloud computing, and smart grid. She received the Best Paper Awards from IEEE Wireless Communications and Networking Conference (WCNC) 2012 and IEEE International Conference on Communications (ICC) 2007. She has served as an Associate Editor of IEEE Transactions on Wireless Communications, EURASIP Journal on Wireless Communications and Networking, International Journal of Communication Systems, and International Journal of Ultra Wideband Communications and Systems, a Guest Editor of Springer Encyclopedia of Wireless Network, Springer Handbook of Cognitive Radio, and Transactions on emerging telecommunications technologies, a TPC symposium co-chair of several conferences including the IEEE flagship conference ICC, and a TPC member of numerous conferences including IEEE INFOCOM, GLOBECOM and ICC.  Her publications have received high citations. According to Google Scholar, her H- index is 40 and citation is 5900+.


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