Rice University

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Electrical and Computer Engineering
Center for Multimedia Communication

Speaker: Kannan Srinivasan
Assistant Professor
Communications Systems and Networking Research Group (CoSyNe)
Computer Science and Engineering
The Ohio State University

Taming The Interference-Limited Wireless Networks

Thursday, February 20, 2014
4:00 PM  to 5:00 PM

1064  George R. Brown Hall
Rice University
6100 Main St
Houston, Texas, USA

By 2020, there will be billions of devices connecting to the Internet. These devices will be ubiquitous and will generate large amounts of sensing and monitoring data that will enable a multitude of applications to improve human life. The key enabler of this vision is the underlying wireless communication technology. However, current wireless networks are notoriously interference-limited. With the number of devices increasing to the billions in the future, current solutions will be crippled to support the amount of data that needs to be communicated.

In the first part of my talk, I will present a way to address a special kind of interference called self-interference, an interference from a node to itself. Specifically, the self-interference that arises from making multi-antenna radios fully flexible. Existing multiple antenna techniques are inflexible; they use all of their antennas for either transmission or reception, as in multiple input multiple output (MIMO) and interference alignment techniques. I will first motivate the need to make wireless nodes flexible. If a wireless node can allocate some of its antennas for transmission and the remaining for reception, then it can improve its efficiency. The exact allocation changes based on link quality, network topology and traffic demand. We call this design FlexRadio. Then, I will present a self-interference cancellation mechanism to deal with the interference from FelxRadio's transmitting antennas at its receiving antennas. I will show that FlexRadio can outperform any existing multiple antenna technology; MIMO, full duplex, multi-user MIMO (MU-MIMO) and interference alignment. I will also present a way to design FlexRadio and show preliminary results from our prototype.

In the second part of my talk, I will motivate the need to have powerful nodes in a network to help out low power and mobile devices cope with interference. Existing interference mitigating techniques such as interference alignment assume all nodes to be equi-capable and stationary. I will present RobinHood, which enables powerful access points to help out less powerful and mobile devices. RobinHood can achieve 6X throughput gain over perfect time division multiple access (TDMA) and 24X gain over WiFi.

Host: Ashutosh Sabharwal

Biography of Kannan Srinivasan:
Kannan Srinivasan is an Assistant Professor in the department of Computer Science and Engineering at the Ohio State University (OSU). He graduated with a Ph.D from Stanford University in 2010 and was a post doctoral researcher at the University of Texas at Austin for a year before joining OSU. He has won multiple awards; Excellent performance award from OSU-CSE, NSF CAREER Award in 2013, Best Paper Runner-Up at IPSN 2013,Best Paper Award at MobiCom 2010, Best Paper Runner-Up at MobiCom 2013, Best Demo Award at MobiCom 2010, Fellowship from Stanford-ECE and a Presidential Award from Oklahoma State University. His work on wireless in-band full duplex broke a century-old belief that a wireless cannot send and receive on the same frequency simultaneously. This work got significant media attention and had both the theory and systems communities revisit the first principles. It's being commercialized by a Stanford start-up company.

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