Amaro-Rivera, Yolian - University of Puerto Rico-Myaguez
Blanton, Benjamin - Virginia Tech
Cartagena Rivera, Wilfredo Omar - University of Puerto Rico-Myaguez
Gonzalez, Daniel Amaury - University of Puerto Rico-Myaguez
Hogan, Douglas Crockett - Virginia Tech
Rodriguez, Mario Jose - University of Puerto Rico-Myaguez
Solberg, Michael Jeffrey - Virginia Tech
Waugh, Justin Andrew - Virginia Tech
Wray, Nigel Devon - Virginia Tech
Abstract— In this paper, we discuss the implementation and results of a simple cognitive engine built for software defined radios. This engine will learn about the environment and be able to provide the modulation which should be used in order to, during the communication, optimize the signal for throughput and match a goal bit error rate for the transmission. The only input to the engine is a running average of the Bit Error Rate (BER) of previous transmissions and the expected signal-to-noise ratio (in dB) of the transmission.
Abstract— This research was conducted to test the method of using the signal strength received by three Universal Software Radio Peripherals (USRPs) from a handheld transmitter to locate the position of that transmitter. By assuming that signal strengths are linear in the dB scale, the characteristic equations found through testing to find the distance from each USRP receiver were used. Through Trilateration and some basic knowledge of the system a unique position of the transmitter can be located. Even though the accuracy of the system fell short of our expectations, we identified several physical and environmental errors that could be corrected in future work.
On August 7, 2009 the participants in the Reserch Experiences for Undergraduates (REU) program presented their final research results. As reported last month, the Research Experiences for Undergraduates (REU) program, sponsored by the National Science Foundation (NSF), supports active research participation by undergraduate students in any of the areas of research funded by the NSF. The Virginia Tech REU site is focused on cognitive communications, and hosts 10 undergraduate students for 10 weeks. This was the first of the three year project.
The event began with a poster session, followed by opening remarks by REU Site Diector, Dr. Tamal Bose. The research presentations included:
Adaptive Digital SDR Waveform got Demonstration of CROSS Architecture
Group Members: Mario J. Rodriguez-Melendez and Wilfredo Cartagena-Rivera
Interface Design for PSCR (Public Safety Cognitive Radios)
Group Members: Douglas Hogan, Nigel d. Wray, and Yolian Amaro-Rivera
Cognitive Engine for Adaptive Modulation
Group Members: Justin Waugh and Daniel Gonzalez-Perez
Signal Strength Geolocation Using USRPs
Group Members: Ben Blaton, Michael Solberg, and Warren Rogers
After the presentations, certificates were awarded to the participants. Dr. Tonya Smith-Jackson, Dr. Kay Thamvichai, Dr. Carl Dietrich, and Dr. Tamal Bose were student mentors, and each signed for their student. We look forward to continuing the REU program next year.