期刊名称：International Journal of Innovative Research in Computer and Communication Engineering
印刷版ISSN：2320-9798
电子版ISSN：2320-9801
出版年度：2017
卷号：5
期号：6
页码：12342
DOI：10.15680/IJIRCCE.2017.0506169
出版社：S&S Publications
摘要：The Cognitive radio network (CRN) is used to increase the spectrum utilization. The number ofapplications emergence which demands a bandwidth. This problem is solved using cognitive radio network in whichsecondary users use the spectrum of primary user opportunistically. This needs sensing of spectrum available fromprimary user. In the conventional spectrum sensing cooperative spectrum sensing is used to improve the secondaryusers detection accuracy. A set of secondary user cooperate by sharing their detected data with each other andcollectively decide the presence or absence of primary user. In a centralized cognitive radio network, on fusion centerthe decision is made by collecting the sensing data from all the secondary users in the network. When secondary usersenses the spectrum, it is possible that it does not identify the primary user because of deep shadow and this in turnsincreases the risk interference to primary user also gives the false detection. Distributed cooperative spectrum sensing ispreferred to a centralized technique because distributed technique is scalable, fault tolerant and efficient. This paperreviews the various techniques used for spectrum sensing. The performance of spectrum sensing is evaluated in termsof probability of false alarm and probability of missed detection.
关键词：Cognitive Radio Network; Distributed Cooperative Spectrum Sensing; Centralized Spectrum Sensing.
