5th International ICST Conference on Wireless Internet

Research Article

Energy minimization approach for optimal cooperative spectrum sensing in sensor-aided cognitive radio networks

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  • @INPROCEEDINGS{10.4108/ICST.WICON2010.8531,
        author={Hai Ngoc Pham and Yan Zhang and Paal E. Engelstad and Tor Skeie and Frank Eliassen},
        title={Energy minimization approach for optimal cooperative spectrum sensing in sensor-aided cognitive radio networks},
        proceedings={5th International ICST Conference on Wireless Internet},
        publisher={IEEE},
        proceedings_a={WICON},
        year={2010},
        month={4},
        keywords={Chromium Cognitive radio Collaboration Energy consumption FCC Informatics Laboratories Measurement Polynomials Sensor fusion},
        doi={10.4108/ICST.WICON2010.8531}
    }
    
  • Hai Ngoc Pham
    Yan Zhang
    Paal E. Engelstad
    Tor Skeie
    Frank Eliassen
    Year: 2010
    Energy minimization approach for optimal cooperative spectrum sensing in sensor-aided cognitive radio networks
    WICON
    IEEE
    DOI: 10.4108/ICST.WICON2010.8531
Hai Ngoc Pham1,2,*, Yan Zhang2,*, Paal E. Engelstad1,2,3,*, Tor Skeie1,2,*, Frank Eliassen1,2,*
  • 1: Department of Informatics, University of Oslo, Norway
  • 2: Simula Research Laboratory, Oslo, Norway
  • 3: Telenor R&I, Oslo, Norway
*Contact email: hainp@ifi.uio.no, yanzhang@simula.no, paalee@ifi.uio.no, tskeie@ifi.uio.no, frank@ifi.uio.no

Abstract

In a sensor-aided cognitive radio network, collaborating battery-powered sensors are deployed to aid the network in cooperative spectrum sensing. These sensors consume energy for spectrum sensing and therefore deplete their life-time, thus we study the key issue in minimizing the sensing energy consumed by such group of collaborating sensors. The IEEE P802.22 standard specifies spectrum sensing accuracy by the detection and false alarm probabilities, hence we address the energy minimization problem under this detection accuracy constraint. Firstly, we derive the bounds for the number of sensors to simultaneously guarantee the thresholds for high detection probability and low false alarm probability. With these bounds, we then formulate the optimization problem to find the optimal sensing interval and the optimal number of sensor that minimize the energy consumption. Thirdly, the approximated analytical solutions are derived to solve the optimization accurately and efficiently in polynomial time. Finally, numerical results show that the minimized energy is significantly lower than the energy consumed by a group of randomly selected sensors. The mean absolute error of the approximated optimal sensing interval compared with the exact value is less than 4% and 8% under good and bad SNR conditions, respectively. The approximated optimal number of sensors is shown to be very close to the exact number.