文章基本信息

标题：COOPERATIVE SPECTRUM SENSING FOR OFDM BASED COGNITIVE RADIO NETWORKS
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作者：MONA.SHOKAIR ; SAHAR.SAID ; RANA. GHALLAB 等
期刊名称：Journal of Theoretical and Applied Information Technology
印刷版ISSN：1992-8645
电子版ISSN：1817-3195
出版年度：2012
卷号：39
期号：1
页码：071-076
出版社：Journal of Theoretical and Applied
摘要：Due to the increase in the usage of wireless devices and the consequent spectrum allocation radio spectrum is becoming scarce. However, studies have shown that most of the allotted spectrum is not used for large periods of time. Cognitive radio (CR) has been proposed to exploit the presence of the spectrum holes. To use the unused spectrum, spectrum sensing is need to know if the primary user (licensed user) exist or not where the spectrum sensing problem has gained new aspects with cognitive radio and opportunistic spectrum access concepts. It is one of the most important operations of cognitive radio, determines the efficiency with which the secondary users or cognitive users (CU) can use the primary spectrum, without causing appreciable interference to the primary users. Severals factors like fading and shadowing affects the ability of the cognitive radio to detect the primary user. In this paper, the performance of cooperation based spectrum sensing scheme will be studied for OFDM (orthogonal frequency division multiplexing) based cognitive users using the energy detector method .The effect of variable channel gain on the cooperation between secondary users will be investigated which is not clarified until now. Moreover, the effect of fusion rules will be made. AWGN will be assumed. Simulation results show that improvement using OR rule with cooperative scheme is better than using AND rule .This is because OR rule is very conservative for CRs to access licensed band.
关键词：Wireless; Cognitive Radio; Cognitive Users; OFDM; AWGN