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.

Secure Spectrum Access Secure Spectrum Access Using Software Defined RadioUsing Software Defined Radio

Dr. Tulin Mangir , Mukul Khairatkar, Juan Chaves, Ali Sener

Department of Electrical Engineering

California State University Long Beach

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.

Objective Research and Development with Software Defined Radio

Acknowledgements

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

What are the benefits of SDR?

• Reconfigurable• Standard Hardware requirement for entire spectrum

• Access to all layers of network

• Simple Architecture

• RobustFind out Who is doing What with SDR?

Jim’s Bluetooth Module

Robin’s Cordless phone

Lilly's Wireless camera

Adam’s cell phone

Juan’s Wireless USB

Barbara’s Home Router

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.

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.

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

Fig. 1 Software Defined Radio Setup

•Simple installation using General Purpose Computer and Linux OS

•GNU Radio Library

•Python Scripts

•Signal Flow Graph

Fig. 2 Wireless Access Point Identification

• Different Wireless Access points are identified

• Power Density and Channel number

• Type of Security and Encryption used

• Location of Access point.

Fig. 5 Robin’s Cordless Phone Use

Fig. 4 Barbara’s Wireless Access Point and Transmitted PowerFig. 3 Spectrum Analyzer

showing different Signal Strength

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. 6 Different signals received and analyzed during experiments

Setup

Experiment

Conclusion