A preload cooperative sensing scheme with low overhead in cognitive radio networks

A preload cooperative sensing scheme with low overhead in cognitive radio networks
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认知无线电网络中低开销的预加载协同感知方案

DOI:
10.1002/wcm.2587
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发表时间:
2016-06
影响因子:
--
通讯作者:
Lu yang
Lu yang
中科院分区:
计算机科学4区
文献类型:
--
作者:
Liu lizheng;Liu fangai;Lu yang

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在认知无线电网络CRN中,用户可以通过协作来提高频谱感知的准确性,但是大量的次用户报告他们的本地感知结果可能会产生显著的开销。本文提出了一种新的预感知方案,称为预感知协作感知PCS,它不仅能达到给定的感知精度,而且减少了整个感知时间T。为了减少感知开销,该方案采用了两个关键技术:选择性报告技术和感知前顺序检测技术。选择性报告技术意味着只有那些检测到主用户存在的用户才需要报告结果,而预感知顺序检测技术是一种异步并行方案,它设置了一个阈值来确定主用户的存在。在考虑预加载检测时隙的情况下,推导出了总体检测失败概率的表达式,并在给定服务质量QoS值的情况下,分析了瑞利衰落信道下PCS的检测开销。此外,我们考虑在PCS的开销最小化问题。仿真结果表明了PCS方案的优越性和有效性。版权所有© 2015约翰威利父子有限公司
In cognitive radio networks CRNs, users can collaborate to improve the accuracy of spectrum sensing, but a large number of secondary users reporting their local sensing results may create significant overhead. In this paper, we propose a new pre-sensing scheme, called preload cooperative sensing PCS, which not only attains the given sensing accuracy for CRNs but also reduces the whole sensing time T. In order to reduce the sensing overhead in CRNs, the proposed scheme adopts two key technologies: selective reporting technology and pre-sensing sequential detection technology. Selective reporting technology implies that only those users, which detect the presence of primary users, need to report the results, while pre-sensing sequential detection technology is an asynchronous parallel scheme, which sets a threshold to determine the presence of primary users. Considering the preload sensing slots, we derive a formula to express the overall miss detection probability, and at a given Quality of Service QoS value, the sensing overheads of PCS are analyzed over Rayleigh fading channel. Also, we consider the overhead minimization problems in PCS. Simulation results show the superiority and efficiency of the PCS scheme. Copyright © 2015John Wiley & Sons, Ltd.
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发表时间: 2014-12
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