ZTE

ZTE Communications ›› 2009, Vol. 7 ›› Issue (2): 11-15.

• Special Topic • Previous Articles     Next Articles

Cooperative Spectrum Sensing Techniques in Cognitive Radio

Wang Haijun, Su Xin, Wang Jing   

  1. Wireless and Mobile Communication Technology R&D Center , Tsinghua University , Beijing 100084 , P . R . China
  • Online:2009-06-25 Published:2020-03-03
  • About author:Wang Haijun is a doctoral degree candidate at the Wireless and Mobile Communication Technology R&D Center of Tsinghua University. He is mainly engaged in the research of software defined radio, CR, cooperative communication and broadband wireless access. So far, he has participated in two foundation-funded projects, applied for two patents and published two papers.

    Su Xin is the deputy director of the Wireless and Mobile Communication Technology R&D Center of Tsinghua University, the deputy group leader of B3G Workgroup of Wireless Communication Technology Committee of China Communications Standards Association, and the technical leader of IMT-Advanced Promotion Group of the Ministry of Industry and Information Technology. He has long been engaged in the research of mobile communication, software defined radio and broadband wireless access.

    Wang Jing is the director of the Wireless and Mobile Communication Technology R&D Center of Tsinghua University, the deputy director of Tsinghua National Laboratory for Information Science and Technology, and a member of Wireless and Mobile Communication Committee of China Institute of Communications (CIC). He has long been engaged in the research of broadband wireless transmission technologies, and wireless and mobile communication systems and networks.
  • Supported by:
    This work was supported by the National High Technology Research and Development Program of China ("863" Program) under Grant No. 2007AA01Z289 and the National Natural Science Foundation of China under Grant No. 2007CB310608.

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Abstract: Cognitive radio has become an effective theory to solve the inefficiency of the spectrum usage. One of the main requirements of cognitive radio systems is the ability to reliably detect the spectrum hole. Previous works on the problem of detection for cognitive radio have suggested the necessity of user cooperation to enable the detection at the low signal-to-noise ratios experienced in practical situations. This paper introduces energy sensing and the cooperative sensing techniques: AND model, OR model, counting model, double threshold model, likelihood ratio model, linear cooperation model and DWCS model. It is proved that significant cooperative gain can be achieved by the proposed models in reducing interference and improving spectrum usage.