ECE Graduate Seminar
<p> </p> <p> You are cordially invited to attend the following seminar:</p> <p> </p> <p> Department of Electrical & Computer Engineering</p> <p> Opportunistic Access to the</p> <p> Radio Frequency Spectrum</p> <p> by</p> <p> Ms. Sara MacDonald</p> <p> Ph.D. Graduate Student</p> <p> Electrical and Computer Engineering Dept.</p> <p> Old Dominion University</p> <p> </p> <p> Friday, March 21, 2014</p> <p> 3:00 p.m. KH 224</p> <p> Host: Dr. Popescu</p> <p> Opportunistic spectrum access (OSA) is a mechanism by which RF spectrum can be utilized by both a primary and secondary user. OSA requires that a secondary user senses the spectrum to determine if the primary user is present prior to transmitting. Therefore, in order for the secondary user to not cause interference to the primary user, it must first successfully detect its presence. Sensing accuracies are often provided as probabilities of detection and probabilities of false alarm and in the case of energy detection are associated with well known theoretical equations. However, these theoretical equations do not prove to be a good fit for pulsed transmitters such as a radar. An alternate theoretical equation which is better suited to intermittent primary transmitters will be presented. A discussion on how these theoretical results are being used to shape sharing between federal radar systems and commercial broadband providers will also be provided. </p> <p> Bio: Sara MacDonald is a lead communications engineer for MITRE, a federally funded research and development center. She has been employed in the area of wireless communications for 14 years, spending most of the this time developing and analyzing mobile ad hoc radios for the Department of Defense. Currently Sara is supporting the Defense Spectrum Organization in their efforts to share federally held spectrum with commercial broadband providers. In addition to her role at MITRE, Sara is a first year PhD student at Old Dominion University. </p>
Posted By: Linda Marshall
Date: Tue Mar 18 10:27:59 EDT 2014