第3讲 认知对抗中的频谱切换时间估计研究  

Method to Estimate Spectrum Handoff Duration in Jamming Cognitive Radio

作　　者：项亚楠 徐以涛[2] 江汉[2] 胡均权[2] 

机构地区：[1]解放军理工大学通信工程学院研究生1队,江苏南京210007 [2]解放军理工大学通信工程学院

出　　处：《军事通信技术》2015年第1期91-97,共7页Journal of Military Communications Technology

基　　金：国家自然科学基金资助项目(60932002;61172062);江苏省自然科学基金资助项目(BK2011116)

摘　　要：认知无线电信号由于具有感知和重构能力,在信息战中的地位越来越重要。要对认知无线电信号进行高效灵巧地干扰,需要得到的关键参数之一是频谱切换时间。当主用户回归或者认知信号遭受较强干扰时,认知用户则需要切换到其他空闲信道上以便继续进行通信。文中首先提出认知用户频谱切换时间估计的基本方案,分为粗检测(宽带频谱侦测)和细检测(针对指定信道的时频分析)两大步骤;然后针对各个步骤分别提出相应的检测算法。仿真结果表明,该方法能较准确地估计出频谱切换时间,而且参数可控性强,便于集成和实现。Cognitive Radio（CR） is now playing an increasingly important role in information warfare because of its special abilities of cognition and reconfiguration. To jam CR signals more effectively and smartly, one of the key parameters must be obtained--spectrum handoff duration. Spectrum handoff occurs when the primary users return in the licensed band or the CR user suf- fers a certain degree of interference so as to vacate the occupied spectrum and find another suit- able channel to resume the transmission. In this paper, firstly a basic scheme to estimate spec- trum handoff duration of CR user was proposed, of which the steps include coarse detection （broadband spectrum detection） and fine detection （the time-frequency of specified channels）. Then, the corresponding algorithms of the two steps were presented, and simulation experiments conducted. The simulation results show that the proposed method can accurately estimate the spectrum handoff duration and is easy for implementation.

关 键 词：认知无线电 电子干扰 频谱切换时间 频谱检测 时频分析 

分 类 号：TN97[电子电信—信号与信息处理]