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An Enhanced Energy Detector for WRAN Systems Using Maximum-to-Mean Power Ratio
정관파,한저,손성환,김재명,Zheng, Guanbo,Han, Ning,Sohn, Sung-Hwan,Kim, Jae-Moung The Korea Institute of Information and Commucation 2008 韓國通信學會論文誌 Vol.33 No.4A
Spectrum sensing is the key challenge in implementing cognitive radio system, which enables unlicensed users to identify "white holes" in the spectrum allocated to primary users and utilize them efficiently. Recent studies have proposed three major sensing methods for WRAN systems, including matched filter, energy and feature detector. However, there are some drawbacks along with them. In this paper, we propose an enhanced energy detector that extends the ability of conventional one, which can differentiate the primary users from each other as well as the noise with different maximum-to-mean power ratio. Furthermore, a novel structure of cognitive radio detector employing the proposed algorithm is also analyzed to implement spectrum sensing. The simulation result shows that our proposed scheme performs well in the individual sensing environment and can satisfy the requirement with high detection probability.
An Enhanced Energy Detector for WRAN Systems Using Maximum-to-Mean Power Ratio
Guanbo Zheng(정관파),Ning Han(한저),Sunghwan Sohn(손성환),Jaemoung Kim(김재명) 한국통신학회 2008 韓國通信學會論文誌 Vol.33 No.4A
Spectrum sensing is the key challenge in implementing cognitive radio system, which enables unlicensed users to identify “white holes” in the spectrum allocated to primary users and utilize them efficiently. Recent studies have proposed three major sensing methods for WRAN systems, including matched filter, energy and feature detector. However, there are some drawbacks along with them. In this paper, we propose an enhanced energy detector that extends the ability of conventional one, which can differentiate the primary users from each other as well as the noise with different maximum-to-mean power ratio. Furthermore, a novel structure of cognitive radio detector employing the proposed algorithm is also analyzed to implement spectrum sensing. The simulation result shows that our proposed scheme performs well in the individual sensing environment and can satisfy the requirement with high detection probability.
An Efficient Weighted-Collaborative Sensing Scheme in Cognitive Radio
황효가,한저,정관파,손성환,김재명,Huang, Xiaoge,Han, Ning,Zheng, Guanbo,Sohn, Sung-Hwan,Kim, Jae-Moung The Korea Institute of Information and Commucation 2007 韓國通信學會論文誌 Vol.32 No.10A
Cognitive Radio is an advanced enabling techlology for efficient utilization of under-utilized spectrum since it is able to sense the temporally available spectrum and adapt its parameters to fully utilize the frequency band. Recent investigation suggests that spectrum sensing is compromised when a cognitive radio user suffers from the environment with fading or shadowing. In order to combat the effect, collaborative sensing is considered to be a promising way, which combines the sensing result of each user to achieve good performance. However, the conventional collaborative sensing is not efficient when users suffer different fading environments. In this paper, we propose a weighted-collaborative scheme that considers using the weights of each collaborative CR user, which can achieve better sensing performance under both fast and slow fading environments. The analysis of the simulation resultsproves that the weighted-collaborative scheme improves sensing performance obviously and outperforms the conventional method.