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Research on Cooperative Spectrum Sensing of Cognitive Radios

Author: TianXueZuo
Tutor: YangZhen
School: Nanjing University of Posts and Telecommunications
Course: Signal and Information Processing
Keywords: Cognitive radio Cooperative spectrum sensing Packet cooperative spectrum sensing Dual - threshold detection Hardware platform
CLC: TN925
Type: Master's thesis
Year: 2012
Downloads: 87
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Abstract

With the development of wireless communication technology, various wireless business quickly appeared, more and more businesses use wireless access, has greatly increased the demand for radio spectrum resources. However, limited spectrum resources so that the development of wireless communications into a bottleneck, and the band utilization is not already assigned to authorized users, cognitive radio technology proposed, both to solve spectrum scarcity problem, but also improve the utilization of the spectrum allocation rate. Cognitive radio links and key technology spectrum sensing to study how to accurately and quickly detect the band, where authorized users access to the communication and retreat when the re-emergence of authorized users in a timely manner. , Multi-user collaborative spectrum sensing its more traditional single-user detection, better detection performance and anti-fading channel has become now a hot research paper on cognitive radio cooperative spectrum sensing technology to expand the in-depth study. Commonly used in single-user detection algorithm and the advantages and disadvantages of paper first introduces the background and one of the key technologies of cognitive radio, which focuses on energy detection algorithm and its detection performance in each channel, and then for a single-user to detect the presence of limitations, the introduction of the concept of a multi-user collaborative spectrum sensing. Collaborative spectrum sensing algorithm introduction, a detailed study hard fusion, the soft fusion algorithm and its detection performance based on soft and hard fusion algorithms double threshold detection algorithm and packet-based cooperative spectrum sensing algorithm, the basis of the above research , the paper proposes an improved packet cooperative spectrum detection algorithm based on dual-threshold detection method. By simulation comparison collaborative detection algorithm, the proposed algorithm, the detection performance is better than a general collaborative detection algorithm, especially in the reporting channel fading channel environment. Finally, the paper designed a detector simulation program based on the collaboration of the hardware platform, the program combines practical communication environment, given the base station and client-side programs, including how to join, and exit the system, and how to report to the base station, when testing when reporting, interface protocols and other aspects of the content, and then given cognitive radio hardware platform based simulation results prove that the simulation program to achieve cooperative spectrum detection scheme, in the case does not affect the authorized user can access into communication, and effectively improve the spectrum utilization.

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