http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
A Novel Cooperative Spectrum Sensing Algorithm in Cognitive Radio Systems
Zheng, Xueqiang,Wang, Jinlong,Wu, Qihui,Shen, Liang The Korea Institute of Information and Commucation 2009 Journal of communications and networks Vol.11 No.2
In cognitive radio (CR) systems, cognitive users can use the frequency bands when the primary users are not present. Hence, reliable detection of available spectrum is foundation of cognitive radio technology. To ensure unimpaired operation of primary users, cooperative spectrum sensing is needed. To reduce the network overhead of cooperative spectrum sensing, a novel cooperative spectrum sensing algorithm based on credibility is proposed. In particular, the close-form expressions for probability of detection and false-alarm are derived for the novel algorithm, and expression for the average overhead used for cooperation is given. The thresholds design method for the algorithm is also discussed. The conclusion is proved by computer simulations.
A Novel Cooperative Spectrum Sensing Algorithm in Cognitive Radio Systems
Xueqiang Zheng,Jinlong Wang,Qihui Wu,Liang Shen 한국통신학회 2009 Journal of communications and networks Vol.11 No.2
In cognitive radio (CR) systems, cognitive users can use the frequency bands when the primary users are not present. Hence, reliable detection of available spectrum is foundation of cognitive radio technology. To ensure unimpaired operation of primary users, cooperative spectrum sensing is needed. To reduce the network overhead of cooperative spectrum sensing, a novel cooperative spectrum sensing algorithm based on credibility is proposed. In particular, the close-form expressions for probability of detection and false-alarm are derived for the novel algorithm, and expression for the average overhead used for cooperation is given. The thresholds design method for the algorithm is also discussed. The conclusion is proved by computer simulations.
Outage Analysis of CRNs with SC Diversity Over Nakagami-m Fading Environment
( Zongsheng Zhang ),( Qihui Wu ),( Xueqiang Zheng ),( Jinlong Wang ),( Lianbao Li ) 한국인터넷정보학회 2013 KSII Transactions on Internet and Information Syst Vol.7 No.12
In this paper, we investigate the outage performance of a cognitive relay network. We consider mutual interference in an independent, non-identically distributed Nakagmai-m fading environment. We first derive the close-form outage probability expression, which provides an efficient means to evaluate the effects of several parameters. This allows us to study the impact of several parameters on the network`s performance. We then derive the asymptotic expression and reveal that the diversity order is strictly determined by the fading severity of the cognitive system. It is not affected by the primary network. Moreover, the primary network only affects the coding gain of the cognitive system. Finally, Monte Carlo simulations are provided, which corroborate the analytical results.