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Performance Analysis of Underlay Cognitive Radio System with Self-Sustainable Relay and Statistical CSI
Nadica Kozić1, Vesna Blagojević1, Predrag Ivaniš1
1School of Electrical Engineering, University of Belgrade, 11000 Belgrade, Serbia.
Sensors (Basel, Switzerland)
|June 2, 2021
Summary
This study analyzes a cooperative cognitive wireless system for devices with limited resources. It derives outage probability for energy-harvesting relays, offering insights into spectrum access strategies.
Area of Science:
- Wireless Communication Systems
- Cognitive Radio Networks
- Resource Management
Background:
- Increasing numbers of small devices with limited power and computation necessitate novel spectrum access methods.
- Coexistence of primary and cognitive networks in shared spectrum bands requires managing interference and outage.
Purpose of the Study:
- To analyze an underlay cooperative cognitive wireless system for resource-constrained devices.
- To derive closed-form expressions for outage probability in a self-sustainable relaying system.
- To investigate the impact of system parameters on cognitive network performance.
Main Methods:
- Utilizing statistical channel state information (CSI) for low-complexity analysis.
- Modeling a decode-and-forward (DF) relaying system with energy harvesting.
- Deriving closed-form outage probability expressions for time-switching (TSR) and power-splitting (PSR) protocols.
Main Results:
- Developed analytical expressions for cognitive network outage probability applicable to TSR and PSR.
- Evaluated the influence of primary and cognitive systems on outage performance.
- Confirmed analytical results through independent simulations.
Conclusions:
- The proposed system offers a viable solution for spectrum access in low-power cognitive networks.
- The derived expressions provide valuable tools for performance analysis and system design.
- Channel parameters significantly impact the outage performance of cognitive networks.
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