[2019-04-15] Prof. Lin Cai, University of Victoria, "Multi-hop wireless pipeline powering Internet of Things"

Poster:Post date:2019-03-08
Title: Multi-hop wireless pipeline powering Internet of Things
Date: 2019-04-15 2:20pm-4:00pm
Location: R210, CSIE
Speaker: Prof. Lin Cai, University of Victoria, CA.
Hosted by: Prof. Phone Lin


Connecting more than half of world population, the Internet changes how we acquire, generate and exchange information and knowledge, and how we work, live, and relate to one another, forever. Enabled by advanced wireless technologies, the Internet will connect billions to trillions of devices in the coming decades, leading to a new era, Internet-of-Things (IoT). Wireless transmission between two devices is a mature technology. However, long-distance wireless transmission for IoT is technically challenging. Wireless communication is broadcast in nature, so signals are propagated and decayed over distance and interfere with each other. To enable long-distance information exchange, it is sensible to construct a multi-hop bidirectional wireless pipeline, so wireless devices can use low power with less interference to relay for each other, to/from the Internet, achieving a higher spatial capacity. However, multi-hop wireless transmission has suffered from the curse that the throughput and reliability degrade quickly when the number of hops increases, due to mutual interference and inefficient resource management. Realizing that the layered Internet architecture designed for wired networks does not fit well for wireless ones, we abandoned the traditional approach that the physical (PHY) layer deals with point-to-point transmission only, and intentionally let the PHY layer be adaptive to network topology and traffic. Following this line of breakthrough, we proposed a multi-hop physical-layer network coding (MPNC) solution to create a wirelessbidirectional pipeline that can maintain an end-to-end (e2e) scalable throughput regardless of the distance, i.e., the throughput of an any-hop path is the same as that of a one-hop transmission if the per-hop distance remains the same, while the e2e bit-error-rate increases merely linearly w.r.t. hop count using an effective error cancellation design. To prove the concept of this non-traditional approach, we have built a software-defined radio testbed to implement the MPNC solution. The test results confirm that, in a static environment, MPNC is feasible to achieve the best possible performance for multi-hop wireless transmissions, a major breakthrough towards the holy grail in wireless networking.
Lin Cai received her M.A.Sc. and PhD degrees (awarded Outstanding Achievement in Graduate Studies) in electrical and computer engineering from the University of Waterloo, Waterloo, Canada, in 2002 and 2005, respectively. Since 2005, she has been with the Department of Electrical & Computer Engineering at the University of Victoria, and she is currently a Professor. Her research interests span several areas in communications and networking, with a focus on network protocol and architecture design supporting emerging multimedia traffic and Internet of Things.
She was a recipient of the NSERC Discovery Accelerator Supplement (DAS) Grants in 2010 and 2015, respectively, and the Best Paper Awards of IEEE ICC 2008 and IEEE WCNC 2011. She has founded and chaired IEEE Victoria Section Vehicular Technology and Communications Joint Societies Chapter. She has been elected to serve the IEEE Vehicular Technology Society Board of Governors, 2019-2021. She has served as an area editor for IEEE Transactions on Vehicular Technology, a member of the Steering
Committee of the IEEE Transactions on Big Data (TBD) and IEEE Transactions on Cloud Computing (TCC), an Associate Editor of the IEEE Internet of Things Journal, IEEE Transactions on Wireless Communications, IEEE Transactions on Vehicular Technology, EURASIP Journal on Wireless Communications and Networking, International Journal of Sensor Networks, and Journal of Communications and Networks (JCN), and as the Distinguished Lecturer of the IEEE VTS Society. She has served as a TPC symposium co-chair for IEEE Globecom'10 and Globecom'13. She is a registered professional engineer of British Columbia, Canada.
Last modification time:2019-03-08 AM 10:27

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