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Energy detection for Cognitive Radio

A discussion on channel sensing techniques. By James Xu. Energy detection for Cognitive Radio. Presentation overview. Introduction to wireless communications What is Cognitive Radio (CR)? Why do we need CR? What is energy detection Our workbench Standard energy detector

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Energy detection for Cognitive Radio

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  1. A discussion on channel sensing techniques By James Xu Energy detectionfor Cognitive Radio

  2. Presentation overview • Introduction to wireless communications • What is Cognitive Radio (CR)? • Why do we need CR? • What is energy detection • Our workbench • Standard energy detector • Problem with the detector • Our improved detection model

  3. Wireless communications

  4. What is Cognitive Radio (CR) • Able to sense spectral environment • Able to provide opportunistic access • Find gaps in the spectrum • Adjust system parameters to utilize it

  5. Why do we need CR? • Unlicensed spectrum is scarce • Almost none available under 3GHz

  6. Why do we need CR? • Licensed to primary user only (Incumbent) • We are running out of space, and higher frequency has problems • We are under utilizing licensed space • CR is allowed usage (guarantee interference free)

  7. Energy detection • The first step in CR is to identify free spectrum • Energy detection is being used

  8. What is energy detection? • All radio transmission have energy • Based on hypothesis testing

  9. Our CR workbench

  10. Energy detector

  11. Energy detector

  12. Problems with the detector • Misdetection on Narrowband signals

  13. Problems with the detector • Misdetection on partial signals

  14. Adaptive energy detection • We proposed an improvement • Introduced adaptive detection

  15. Improved detection

  16. Adaptive ED characteristics

  17. Adaptive ED characteristics

  18. Thank you for listening • Any questions?

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