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Colloquium - Marshall

Quantifying Aspects of Cognitive Radio and Dynamic Spectrum Access Performance and Interference Tolerance as a Spectrum Principle
Preston Marshall
University of Southern California
9/8/2009
10:00am-11:00am

This talk will discuss the application of Cognitive Radio and Dynamic Spectrum Access to enhance the performance of wireless systems. While much of the dialog and research regarding Dynamic Spectrum Access has focused on questions of interference to other users, and in secondary access to spectrum, this talk will focus on the benefits of Dynamic Spectrum Access enabled adaptation in reducing requirements for receiver dynamic range and front-end inter-modulation resistance, increasing the density of wireless operation, and in initiating a transition to wireless systems that are inherently interference mitigating and tolerant. The quantitative analysis leads to the conclusion that DSA has fundamental advantages, even to primary users that are not in need of additional spectrum access. The quantitative analysis to be presented will include methods of characterizing spectrum environments in a closed form probability distribution, noise effects of front end overload, and density of wireless networks under an number of interference avoidance and mitigation regimes.

Based on this analysis, it will be argued that it is in the interests of both licensed primary users, as well as potential unlicensed, or secondary users to transition spectrum management from a principle of high confidence interference avoidance, to one that is a balanced responsibility for interference effects mitigation and tolerance. Such a regime could offer users assured spectrum access, greatly increased spectrum density or usage, potential reductions in component performance requirements and co-site desensitization, higher reliability, and more flexible deployment. At the same time, such a regime makes sharing of this spectrum by secondary users more practical, since it will not be necessary to provide such low interference probabilities that it practically constrains such usage to low density and low power.

Preston F. Marshall is a Director at the Information Sciences Institute of University of Southern California, with leadership for wireless networking research. Formerly he was Program Manager with the Defense Advanced Research Projects Agency (DARPA) Strategic Technology Office (STO), for many of the DARPA Wireless, Cognitive Radio, and networking programs. These programs include the XG Dynamic Spectrum Access development, Wireless Networking after Next (WNAN) cognitive radioprogram for low cost wireless networking and the Disruption and Delay Tolerant Networking Program (DTN). These programs collectively provided the technology base for high performance and affordable infrastructureless wireless networking. Mr. Marshall has written many articles, book chapters and conference presentations on the subject of DSA and cognitive radio. Marshall is Executive Chair of the IEEE DYSPAN conference. He holds a BSEE and MS Information Science from Lehigh University, and is also a Graduate student at Trinity College, Dublin.

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