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Energy-Efficient Sensing and Transmission for Multi-Hop Relay cognitive radio sensor networks

China Communications 2018年第9期15卷 106-117页

作者： Bin Han Min Zeng Qiumei Guo Hong Jiang Qiuyun Zhang Li Feng School of Information Engineering Southwest University of Science and Technology Engineering and Technology College Sichuan Radio and TV University

How to achieve transmissions in an energy-efficient way in multi-hop decode and forward(DF) relay cognitive radio sensor networks(CRSNs) is important since sensor nodes in CRSNs are usually battery powered. This paper aims to maximize energy efficiency(EE) by joint optimizing sensing time and power allocation in multi-channels & multihops DF relay CRSNs under constraints on outage probability and sensing performance. First, we design a channel selection scheme for sensing according to the available probabilities of multi channels. Second, we analyze the expected throughput and energy consumption and formulate the EE problem as a concave/concave fractional program. Third, coordinate ascent and Charnes-Cooper Transformation(CCT) methods are used to transform the nonlinear fractional problem into an equivalent concave problem. Subsequently, the closed form of outage probability is derived and the convergence rate of the iterative algorithm is analyzed. Finally, simulation results show that the proposed scheme can achieve effective EE.

关键词： energy efficiency cognitive radio sensor network outage probability fractional program

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Energy-efficient spectrum-aware clustering for cognitive radio sensor networks

引用

Science Bulletin 2012年第Z2期 3731-3739页

作者： ZHANG HuaZi 1,2,ZHANG ZhaoYang 1,2* & YUEN Chau 3 1 Department of Information Science and Electronic Engineering,Zhejiang University,Hangzhou 310027,China 2 Zhejiang Provincial Key Laboratory of Information network Technology,Hangzhou 310027,China 3 Singapore University of Technology and Design,Singapore

As a smart combination of cognitive radio networks and wireless sensor networks,recently introduced cognitive radio sensor network(CRSN) poses new challenges to the design of topology maintenance techniques for dynamic primary-user *** paper aims to provide a solution to the energy-efficient spectrum-aware CRSN clustering ***,we design the clustered structure,establish a network-wide energy consumption model and determine the optimal number of *** then employ the ideas from constrained clustering and propose both a centralized spectrum-aware clustering algorithm and a distributed spectrum-aware clustering(DSAC) *** extensive simulations,we demonstrate that DSAC can effectively form clusters under a dynamic spectrum-aware ***,DSAC exhibits preferable scalability and stability with its low complexity and quick convergence under dynamic spectrum variation.

关键词： cognitive radio sensor network constrained clustering energy efficient distributed spectrum-aware clustering

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