Cyclostationary Feature Detection Based Spectrum Sensing Algorithm under Complicated Electromagnetic Environment in Cognitive Radio Networks  

作　　者：Yang Mingchuan Li Yuan Liu Xiaofeng Tang Wenyan 

机构地区：[1]Communication Research Center, Harbin Institute of Technology [2]Key Lab.for Spacecraft TT&C and Communication under the Ministry of Education [3]Instrument Science and Technology Postdoctoral Station, Harbin Institute of Technology

出　　处：《China Communications》2015年第9期35-44,共10页中国通信（英文版）

基　　金：sponsored by National Basic Research Program of China (973 Program, No. 2013CB329003);National Natural Science Foundation of China (No. 91438205);China Postdoctoral Science Foundation (No. 2011M500664);Open Research fund Program of Key Lab. for Spacecraft TT&C and Communication, Ministry of Education, China (No.CTTC-FX201305)

摘　　要：This paper focuses on improving the detection performance of spectrum sensing in cognitive radio(CR) networks under complicated electromagnetic environment. Some existing fast spectrum sensing algorithms cannot get specific features of the licensed users'(LUs') signal, thus they cannot be applied in this situation without knowing the power of noise. On the other hand some algorithms that yield specific features are too complicated. In this paper, an algorithm based on the cyclostationary feature detection and theory of Hilbert transformation is proposed. Comparing with the conventional cyclostationary feature detection algorithm, this approach is more flexible i.e. it can flexibly change the computational complexity according to current electromagnetic environment by changing its sampling times and the step size of cyclic frequency. Results of simulation indicate that this approach can flexibly detect the feature of received signal and provide satisfactory detection performance compared to existing approaches in low Signal-to-noise Ratio(SNR) situations.This paper focuses on improving the detection performance of spectrum sensing in cognitive radio（CR） networks under complicated electromagnetic environment. Some existing fast spectrum sensing algorithms cannot get specific features of the licensed users＇（LUs＇） signal, thus they cannot be applied in this situation without knowing the power of noise. On the other hand some algorithms that yield specific features are too complicated. In this paper, an algorithm based on the cyclostationary feature detection and theory of Hilbert transformation is proposed. Comparing with the conventional cyclostationary feature detection algorithm, this approach is more flexible i.e. it can flexibly change the computational complexity according to current electromagnetic environment by changing its sampling times and the step size of cyclic frequency. Results of simulation indicate that this approach can flexibly detect the feature of received signal and provide satisfactory detection performance compared to existing approaches in low Signal-to-noise Ratio（SNR） situations.

关 键 词：cognitive radio cyclostationary feature detection Hilbert transformation 

分 类 号：TN925[电子电信—通信与信息系统]