wireless comm ppt1

Time division energy efficient sensing technique for Cognitive radio

May 3, 2023IIITDM KANCHEEPURAM

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Efficient Spectrum Discovery with Energy Constraints in Cognitive Radio Networks

Submitted By – Submitted to- Chetan soni(CDS14M002) Dr. K Premkumar Prabhu prasad(CDS14M005)



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Contents

Cognitive Radio Spectrum sensing scheme

• Non cooperative • Cooperative

TDEE



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Cognitive radio-• Cognitive Radio (CR) is being considered as a highly promising technique for

addressing spectrum scarcity and improving spectrum efficiency.

• Main objective of cognitive radio is fast spectrum band discovery by using low power.

• Primary users (PU).

• Secondary users (SU).

• Spectrum holes.

• Spectrum sensing.

Basis points in cognitive radio technology-



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A brief of working scenario-

Primary user



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Spectrum sensing schemes

• Non cooperative • Cooperative • Time division energy efficient technique

Non cooperative – a single SU is used for obtaining the activity of two channels. In one sensing slot, the SU can sense only one channel.

Cooperative – In this scheme two SUs can sense two different channel at the same time.



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1.Non cooperative-

2.Cooperative sensing-



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3.Time division energy efficient sensing- In this sensing scheme the sensing period is divided into an optimal number of timeslots and each Secondary User (SU) is assigned to detect a different channel in one time-slot.

• After sensing all SUs shall send the sensing results to the fusion center tomake the final decision based on a fusion rule.

Advantage of TDEE sensing- Energy saved because no need to share control message to all secondary users.



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References -

Efficient Spectrum Discovery with EnergyConstraints in Cognitive Radio Networks• Yi Liu, Rong Yu, Shengli XieSchool of Elect.&Inform. Engineering,• Yan ZhangSimula Research Laboratory, Norway;Department of Informatics,University of Oslo, NorwayEmail: [email protected]• Victor C.M. LeungDepartment of Elect.&Comput. Engineering,University of British Columbia, Canada



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THANK YOU