Energy detection for Cognitive Radio
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![Page 1: Energy detection for Cognitive Radio](https://reader035.fdocuments.in/reader035/viewer/2022062308/5681308d550346895d9669e5/html5/thumbnails/1.jpg)
Energy detectionfor Cognitive Radio
A discussion on channel sensing techniques
By James Xu
![Page 2: Energy detection for Cognitive Radio](https://reader035.fdocuments.in/reader035/viewer/2022062308/5681308d550346895d9669e5/html5/thumbnails/2.jpg)
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
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Wireless communications
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What is Cognitive Radio (CR) Able to sense spectral environment Able to provide opportunistic access
Find gaps in the spectrumAdjust system parameters to utilize it
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Why do we need CR?
Unlicensed spectrum is scarce Almost none available under 3GHz
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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)
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Energy detection
The first step in CR is to identify free spectrum
Energy detection is being used
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What is energy detection? All radio transmission have energy
Based on hypothesis testing
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Our CR workbench
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Energy detector
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Energy detector
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Problems with the detector Misdetection on Narrowband signals
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Problems with the detector Misdetection on partial signals
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Adaptive energy detection We proposed an
improvement Introduced adaptive
detection
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Improved detection
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Adaptive ED characteristics
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Adaptive ED characteristics
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Thank you for listening
Any questions?