摘要
频谱感知是认知无线电的一项关键技术,也是认知循环的基础。如何高效快速感知频谱环境分布一直是学术界研究的热点问题,尤其是对实际的空中信号进行实时测量是目前频谱感知研究亟待解决的难题。针对以上需求,利用USRP平台和MATLAB信号处理工具设计并实现了一种分布式宽带频谱快速感知系统,系统可支持多种频谱感知算法,通过千兆以太网可在中央处理模块融合感知节点的数据。并对实际的0.4~4.4 GHz无线频谱环境进行了初步测量,该系统能够及时发现频谱空穴和目标信号的存在,能够将感知结果上传给中央处理模块进行分析和存储,具有应用推广价值。
Spectrum sensing, as a key technology in cognitive radio, acts as the foundation of cognitive loop. How to achieve effective and rapid sensing of spectral distribution in surroundings always attracts much attention from the academic circle, and now becomes a hard problem demanding prompt solution in real-time measurement of the actual signals on the air. In order to deal with the problem mentioned above, a distributed wideband spectrum sensing system based on USRP platform and MATLAB signal processing tools is designed and implemented, which can support various algorithms of spectrum sensing and make a fusion of data from sending nodes in central processing module via Gigabit Ethernet. The preliminary meas- urement on the whole spectrum band from 0.4GHz to 4.4GHz indicates that this system could find spec- trum holes and the presence of target signal in a very short time, and in addition, could store the final de- cision from each node and make further analysis in central processing module, thus is of certain application and popularization value.
出处
《通信技术》
2015年第6期750-754,共5页
Communications Technology
关键词
认知无线电
宽带频谱感知
能量检测
多窄带检测
cognitive radio
wideband spectrum sensing
energy detection
muhi-narrowband detection
