Wireless comm ppt1
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This document discusses spectrum sensing techniques for cognitive radio networks. It describes cognitive radio as allowing secondary users to opportunistically access spectrum holes not being used by primary users. It outlines non-cooperative and cooperative spectrum sensing schemes, and introduces a new Time Division Energy Efficient (TDEE) sensing technique. TDEE divides the sensing period into timeslots, with each secondary user detecting a different channel, allowing more efficient sensing than non-cooperative methods while sharing less control messages than cooperative schemes. The document provides an overview of these sensing methods and their advantages for cognitive radio networks operating with energy constraints.
Wireless comm ppt1
- 1. Time division energy efficient sensing technique for Cognitive radio Efficient Spectrum Discovery with Energy Constraints in Cognitive Radio Networks Submitted By – Submitted to- Chetan soni(CDS14M002) Dr. K Premkumar Prabhu prasad(CDS14M005) IIITDM KANCHEEPURAM 1 May 15
- 2. Time division energy efficient sensing technique for Cognitive radio IIITDM KANCHEEPURAM 2 Contents Cognitive Radio Spectrum sensing scheme • Non cooperative • Cooperative TDEE May 15
- 3. Time division energy efficient sensing technique for Cognitive radio May 15IIITDM KANCHEEPURAM 3 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-
- 4. Time division energy efficient sensing technique for Cognitive radio May 15IIITDM KANCHEEPURAM 4 A brief of working scenario- Primary user
- 5. Time division energy efficient sensing technique for Cognitive radio May 15IIITDM KANCHEEPURAM 5 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.
- 6. Time division energy efficient sensing technique for Cognitive radio May 15IIITDM KANCHEEPURAM 6 1.Non cooperative- 2.Cooperative sensing-
- 7. Time division energy efficient sensing technique for Cognitive radio May 15IIITDM KANCHEEPURAM 7 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 to make 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.
- 8. Time division energy efficient sensing technique for Cognitive radio May 15IIITDM KANCHEEPURAM 8 References - Efficient Spectrum Discovery with Energy Constraints in Cognitive Radio Networks • Yi Liu, Rong Yu, Shengli Xie School of Elect.&Inform. Engineering, • Yan Zhang Simula Research Laboratory, Norway; Department of Informatics, University of Oslo, Norway Email: yanzhang@simula.no • Victor C.M. Leung Department of Elect.&Comput. Engineering, University of British Columbia, Canada
- 9. Time division energy efficient sensing technique for Cognitive radio May 15IIITDM KANCHEEPURAM 9 THANK YOU