Performance Analysis of Hard Combing Schemes in Cooperative Spectrum Sensing for Cognitive Radio Networks
Tanuja S. Dhope Shendkar1, Sulakshana Patil2, Vijaya Rajeshwarkar3, Dina Simunicr4
1Tanuja S. Dhope  Shendkar, E & TC Department, Sinhgad Inst. of Technology, Lonavala, India.
2Sulakshana Patil, E & TC Department, Sinhgad Inst. of Technology, Lonavala, India.
3Vijaya Rajeshwarkar, E & TC Department, Sinhgad Inst. of Technology, Lonavala, India.
4Dina Simunic, FER, University of Zagreb, Croatia, India.
Manuscript received on January 20, 2013. | Revised Manuscript received on February 12, 2013. | Manuscript published on February 28, 2013. | PP: 170-175 | Volume-2 Issue-3, February 2013.  | Retrieval Number: C1037022313 /2013©BEIESP

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Abstract: The basic idea of cognitive radio is to reuse the spectrum whenever it finds the spectrum holes in wireless environment. However, detection performance in practice is often compromised with multipath fading, shadowing, receiver uncertainty and even hidden node problem due to primary users activity that is not spatially localized. To mitigate the impact of these issues, cooperative spectrum sensing has been shown to be an effective method to improve the probability of detection by exploiting spatial diversity by collaborating. This paper studies cooperative spectrum sensing and signal detection in cognitive radio system by implementing hard combining in data fusion centre using energy detector to observe the presence of primary user signal. In this paper, we analyzed the detector performance exploiting TV white space by employing OR and AND rules as decision combining under AWGN, Rayleigh time varying fading channel by setting probabilities of false alarm and measuring probability of detection. The simulation results show that cooperative spectrum sensing employing OR rule has better performance than non-cooperative. The performance of signal detection degrades in time varying fading Rayleigh channel compared to flat fading Rayleigh channel.
Keywords: IEEE 802.11af, Energy detection, Fading channels, Spectrum sensing, Cognitive radio, Cooperative Sensing, Hard decision.