Cognitive radio: some security issues
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This document discusses security issues in cognitive radio networks. It introduces cognitive radio and describes its ability to sense available spectrum and adapt to optimize usage. The document outlines techniques for spectrum sensing, including matched filtering, cyclostationary feature detection, and energy detection. It also discusses the problem of primary user emulation attacks, where secondary users pretend to be primary users to prevent other secondary users from accessing idle spectrum. Simulation results are presented showing the effects of these malicious users. An altered system model is then proposed to help counteract primary user emulation attacks.
Cognitive radio: some security issues
- 2. OVERVIEW Introduction What is Cognitive Radio? Spectrum Sensing Primary User Emulation Simulation & Results
- 3. INTRODUCTION Evolution of numerous wireless applications. Limited Public Bandwidth or Spectrum Inefficient use of Licensed Spectrum What if one could use the licensed spectrum when no primary users are using it?
- 5. WHAT IS COGNITIVE RADIO? Intelligent Radio. Senses Environment and Spectrum(Cognitive capability). Analyzes it(Self-organized capability). Adapts to it(Reconfigurable capability). Learns from the results.
- 6. General Architecture of Cognitive Radio
- 7. SPECTRUM SENSING Dynamic Spectrum Access (DSA) Distributed Spectrum Sensing (DSS) Common Control Channel (CCC)
- 9. SPECTRUM SENSING Dynamic Spectrum Access (DSA) Distributed Spectrum Sensing (DSS) Common Control Channel (CCC)
- 10. SPECTRUM SENSING Dynamic Spectrum Access (DSA) Distributed Spectrum Sensing (DSS) Common Control Channel (CCC)
- 12. SPECTRUM SENSING TECHNIQUES Matched Filter Cyclo-Stationary Feature Energy Detection
- 13. SPECTRUM SENSING TECHNIQUES Matched Filter Cyclo-Stationary Feature Energy Detection
- 14. SPECTRUM SENSING TECHNIQUES Matched Filter Cyclo-Stationary Feature Energy Detection
- 15. PRIMARY USER EMULATION Idle spectrum can be used by secondary users without causing disturbance to the primary user. But these secondary users must co-operate and use the spectrum fairly. Some secondary users prevent others from using this idle spectrum by transmitting unrecognizable signals. i.e. they emulate (imitate) the primary users and hence prevent secondary users from utilizing it. They are of two types: Selfish PUE attackers Malicious PUE attackers
- 16. SYSTEM MODEL FOR CRNs
- 17. Received power due to Primary Transmitter, Pr_p PDF of Pr_p Received power due to Malicious users, Pr_m PDF of Pr_m
- 18. SIMULATION & RESULTS The following slides contain the simulated results of the PDFs of signals received by the secondary receiver due to primary transmitter and malicious users.
- 22. SYSTEM MODEL FOR CRNs
- 23. SYSTEM MODEL ALTERATION As it can be seen, the results of the previous system model are not desirable. So, another system model is presented to counteract the PUE.
- 24. PROPOSED MODEL