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Enabling Technologies for Cognitive Radio-based Spectrum Sharing

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  • Faculty Lecture Series
When Oct 02, 2013
from 10:00 AM to 12:00 PM
Where Engr. IV Bldg, Shannon Room 54-134
Contact Name
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Professor Danijela Cabric

UCLA, Electrical Engineering



A major shift in wireless communications is now emerging with the development of cognitive radios, which attempt to share spectrum in a fundamentally new way. These radios are addressing the fact that spectrum is actually poorly utilized in many bands, in spite of the increasing demand for wireless connectivity. On a conceptual level, cognitive radio networks sense the spectral environment and adapt transmission parameters to dynamically reuse available spectrum. The realization of this concept could provide up to 100 times increase in throughput and network capacity and a new frontier of opportunities for radio designers and wireless application developers. However, the novelty of this approach requires new mechanisms for using radio frequencies through sharing rather than fixed allocations.

In this talk, I will discuss our progress towards theoretical understanding and implementation of the key enabling technologies for cognitive radios based spectrum sharing. Starting with the radio design for spectrum sensing, I will describe main challenges in realizing wideband cognitive radios and present our novel architectural and DSP solutions that provide high sensitivity under large dynamic range, circuits impairments and energy constraints. Spectrum sharing also requires co-existence and cognitive interference management among heterogeneous networks which is the central problem addressed by our design framework for spatio-temporal spectrum sensing, and traffic and location aware spectrum sharing protocols. While cognitive radio paradigm enables more flexible and efficient usage of spectrum, it also opens possibilities for new types of security attacks and greedy access strategies. I will introduce our learning based approach for detecting and counteracting a few classes of misbehaving radios.   At the end, I will discuss future directions in the design of cognitive radios and spectrum sharing networking and highlight a few emerging applications. 



Danijela Cabric received the Dipl. Ing. degree from the University of Belgrade, Serbia, in 1998, M.S. degree in electrical engineering from the University of California, Los Angeles, in 2001 and Ph.D. degree in electrical engineering from the University of California, Berkeley, in 2007. In 2008, she joined the faculty of the Electrical Engineering Department at the University of California, Los Angeles as an Assistant Professor. Prof. Cabric is the director of the Cognitive Reconfigurable Embedded Systems Lab, which focuses on all modern radio technologies, with an emphasis on systems that enable more efficient utilization of the spectrum. She was awarded Samueli Fellowship in 2008, Okawa Foundation research grant in 2009, Hellman Fellowship in 2012 and NSF CAREER award in 2012.

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