摘要
针对人为性的电磁频谱资源匮乏问题,认知无线电技术有效提高了频谱资源利用率,而作为其核心技术的频谱感知成为研究的热点。国内外学者相继提出了各种频谱感知算法,不同方面不同程度改善了频谱检测性能,使其逐步适应复杂的电磁环境,提高利用率,破除人为性资源匮乏的制约。因此,综述频谱感知技术的发展历程,分析低信噪比下单节点和协作频谱感知性能,对比介绍了协作频谱感知系统结构和信息融合原则,最后指出频谱感知技术的发展趋势及存在的挑战。
In view of the man-made electromagnetic spectrum resources scarcity, cognitive radio could effectively improve the utilization of spectrum resources, and spectrum sensing, as its core technology, now become a hot research topic. Domestic and foreign scholars successively propose various spectrum sensing algorithms, thus to improve the spectrum–detection performance in different aspects and different degrees, make it gradually adapt to the complex electromagnetic environment, improve utilization, eliminate man-made constraints of resource scarcity. In view of this, the development history of spectrum sensing technology is summarized, the single node and cooperative spectrum sensing performance under low signal to noise ratio （SNR） analyzed. In addition, the structure of cooperative spectrum sensing system and the principle of information fusion are described. Finally, the development trend and existing challenges of spectrum sensing technology are presented.
出处
《通信技术》
2018年第2期261-265,共5页
Communications Technology
关键词
认知无线电
低信噪比
信息融合
协作频谱感知
cognitive radio
low SNR
information fusion
cooperative spectrum sensing
