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Sensors 2016, 16(4), 445;

A Sensitive Secondary Users Selection Algorithm for Cognitive Radio Ad Hoc Networks

Department of Information and Communication System, Hohai University, Changzhou 213022, China
Department of Signal and Information Processing, Heilongjiang Univetsity, Harbin 15006, China
Guangdong Petrochemical Equipment Fault Diagnosis Key Laboratory, Guangdong University of Petrochemical Technology, Maoming 525000, China
Author to whom correspondence should be addressed.
Academic Editor: Yunchuan Sun
Received: 21 February 2016 / Revised: 18 March 2016 / Accepted: 22 March 2016 / Published: 26 March 2016
(This article belongs to the Special Issue Identification, Information & Knowledge in the Internet of Things)
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Secondary Users (SUs) are allowed to use the temporarily unused licensed spectrum without disturbing Primary Users (PUs) in Cognitive Radio Ad Hoc Networks (CRAHNs). Existing architectures for CRAHNs impose energy-consuming Cognitive Radios (CRs) on SUs. However, the advanced CRs will increase energy cost for their cognitive functionalities, which is undesirable for the battery powered devices. A new architecture referred to as spectral Requirement-based CRAHN (RCRAHN) is proposed to enhance energy efficiency for CRAHNs in this paper. In RCRAHNs, only parts of SUs are equipped with CRs. SUs equipped with CRs are referred to as Cognitive Radio Users (CRUs). To further enhance energy efficiency of CRAHNs, we aim to select minimum CRUs to sense available spectrum. A non-linear programming problem is mathematically formulated under the constraints of energy efficiency and real-time. Considering the NP-hardness of the problem, a framework of a heuristic algorithm referred to as Sensitive Secondary Users Selection (SSUS) was designed to compute the near-optimal solutions. The simulation results demonstrate that SSUS not only improves the energy efficiency, but also achieves satisfied performances in end-to-end delay and communication reliability. View Full-Text
Keywords: SSUS; CRAHNs; network architecture; energy efficiency; real-time SSUS; CRAHNs; network architecture; energy efficiency; real-time

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Li, A.; Han, G.; Wan, L.; Shu, L. A Sensitive Secondary Users Selection Algorithm for Cognitive Radio Ad Hoc Networks. Sensors 2016, 16, 445.

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