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Sensors 2013, 13(4), 5251-5272; doi:10.3390/s130405251

Optimal Periodic Cooperative Spectrum Sensing Based on Weight Fusion in Cognitive Radio Networks

1,2,3,* , 1,* , 1,* and 1
1
Communication Research Center, Harbin Institute of Technology, Harbin 150080, Heilongjiang, China
2
College of Astronautics, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, Jiangsu, China
3
School of Electrical and Electronic Engineering, Nanyang Technological University, 637553, Singapore
*
Authors to whom correspondence should be addressed.
Received: 29 January 2013 / Revised: 5 April 2013 / Accepted: 11 April 2013 / Published: 19 April 2013
(This article belongs to the Section Sensor Networks)
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Abstract

The performance of cooperative spectrum sensing in cognitive radio (CR) networks depends on the sensing mode, the sensing time and the number of cooperative users. In order to improve the sensing performance and reduce the interference to the primary user (PU), a periodic cooperative spectrum sensing model based on weight fusion is proposed in this paper. Moreover, the sensing period, the sensing time and the searching time are optimized, respectively. Firstly the sensing period is optimized to improve the spectrum utilization and reduce the interference, then the joint optimization algorithm of the local sensing time and the number of cooperative users, is proposed to obtain the optimal sensing time for improving the throughput of the cognitive radio user (CRU) during each period, and finally the water-filling principle is applied to optimize the searching time in order to make the CRU find an idle channel within the shortest time. The simulation results show that compared with the previous algorithms, the optimal sensing period can improve the spectrum utilization of the CRU and decrease the interference to the PU significantly, the optimal sensing time can make the CRU achieve the largest throughput, and the optimal searching time can make the CRU find an idle channel with the least time.
Keywords: cognitive radio; energy sensing; cooperative spectrum sensing; sensing period; throughput cognitive radio; energy sensing; cooperative spectrum sensing; sensing period; throughput
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This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Liu, X.; Jia, M.; Gu, X.; Tan, X. Optimal Periodic Cooperative Spectrum Sensing Based on Weight Fusion in Cognitive Radio Networks. Sensors 2013, 13, 5251-5272.

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