A discussion on channel sensing techniques By James Xu.

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Presentation transcript:

A discussion on channel sensing techniques By James Xu

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

Wireless communications

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

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

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)

Energy detection  The first step in CR is to identify free spectrum  Energy detection is being used

What is energy detection?  All radio transmission have energy  Based on hypothesis testing

Our CR workbench

Energy detector

Problems with the detector  Misdetection on Narrowband signals

Problems with the detector  Misdetection on partial signals

Adaptive energy detection  We proposed an improvement  Introduced adaptive detection

 Improved detection

Adaptive ED characteristics

Thank you for listening  Any questions?

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