What is Software Defined Radio?

1. Secure Spectrum Access Using Software Defined Radio Dr. Tulin Mangir , Mukul Khairatkar, Juan Chaves, Ali Sener Department of Electrical Engineering California State University Long Beach Objective Research and Development with Software Defined Radio Result and Conclusion • To Monitor unwanted signal sources in specific frequency band • To alleviate Excessive use of Spectrum • To introduce Intrusion Detection at the Physical Layer of Wireless Device. Setup • Simple installation using General Purpose Computer and Linux OS • GNU Radio Library • Python Scripts • Signal Flow Graph • What is Software Defined Radio? • A Software-Defined Radio (SDR) is system where components implemented in hardware are instead implemented using software on a personal computer or other embedded computing devices. • A basic SDR may consist of a computer (PC) equipped with a sound card, or other analog-to-digital converter, preceded by some form of RF front end. Fig. 1 Software Defined Radio Setup Experiment • Different Wireless Access points are identified • Power Density and Channel number • Type of Security and Encryption used • Location of Access point. Fig. 6 Different signals received and analyzed during experiments • What are the benefits of SDR? • Reconfigurable • Standard Hardware requirement for entire spectrum • Access to all layers of network • Simple Architecture • Robust Conclusion • With Software Defined Radio we can monitor unwanted signal source and detect them. • We can identify access point s in ISM band and map them to unused frequency band to alleviate excessive use of spectrum. • Sense−Learn−Adapt System can be developed which will prevent intrusion in wireless networks. • SDR can be used as a Signal Jamming Device for certain frequency range. Fig. 2 Wireless Access Point Identification Find out Who is doing What with SDR? Juan’s Wireless USB • Where we can use SDR? • Military Communication Systems • Government and Dept. of Homeland Security • Transportation Communication System • Satellite Communication • Amateur and HAM radio • Home and Office Wireless Network Robin’s Cordless phone Acknowledgements Jim’s Bluetooth Module Lilly's Wireless camera We are thankful to PROVOST for providing Graduate Research Fellowship to conduct this research. We are grateful to National Science Foundation (NSF Project # 0417283) for their partial support . We are also thankful to College of Engineering for their support with facilities and instruments. Barbara’s Home Router Adam’s cell phone • Software Defined Radio or Cognitive Radio • Software Defined Radio is a software representation of a fixed radio. • Cognitive Radio is a advanced form of SDR which senses for empty band (white space) across specified spectrum and then transfer communication from old band to new band. For more information Dr. Tulin Mangir1250 Bellflower Blvd. Dept. of Electrical Engineering ET-106 (Wireless Network Research Lab ET-111)Long Beach, CA, 90840.Tel: 562-985-5774Email: temangir@csulb.edu Fig. 4 Barbara’s Wireless Access Point and Transmitted Power Fig. 5 Robin’s Cordless Phone Use Fig. 3 Spectrum Analyzer showing different Signal Strength