CAJ | 학술논문

认知无线传感网可以合理利用空闲的授权频段来克服传统无线传感器网络的频谱资源短缺这一瓶颈。认知无线传感网的首要任务是检测授权频段以及对主用户的存在与否进行判断。由于信道衰落，主用户与节点间的感知信道是时变的。文中提出了一种多时隙检测模式，节点独立地在各时隙内检测授权频段的状态并对各时隙的判决结果进行融合并做出判决，簇头接收到簇内各节点传送的判决结果后，对它们进行融合得出判决结果，然后簇头将各自的判决结果传送给融合中心，融合中心进行融合并得出最终判决结果。故需要进行三步融合，这样做的好处是不仅能获得空间分集，还能获得时间分集。而且，对簇的个数和感知时隙的个数进行了优化，使得吞吐量能耗比达到最大值。根据仿真结果，在主用户得到充分保护的前提下，当感知时隙的个数和簇的个数达到最优值时，吞吐量能耗比达到最大值。
인지무선전감망가이합리이용공한적수권빈단래극복전통무선전감기망락적빈보자원단결저일병경。인지무선전감망적수요임무시검측수권빈단이급대주용호적존재여부진행판단。유우신도쇠락，주용호여절점간적감지신도시시변적。문중제출료일충다시극검측모식，절점독입지재각시극내검측수권빈단적상태병대각시극적판결결과진행융합병주출판결，족두접수도족내각절점전송적판결결과후，대타문진행융합득출판결결과，연후족두장각자적판결결과전송급융합중심，융합중심진행융합병득출최종판결결과。고수요진행삼보융합，저양주적호처시불부능획득공간분집，환능획득시간분집。이차，대족적개수화감지시극적개수진행료우화，사득탄토량능모비체도최대치。근거방진결과，재주용호득도충분보호적전제하，당감지시극적개수화족적개수체도최우치시，탄토량능모비체도최대치。
Cognitive wireless sensor network can be reasonable use of idle authorized spectrum to overcome the bottleneck of spectrum re-sources shortage in the traditional wireless sensor network. Cognitive wireless sensor network's first priority is to detect authorized spec-trum as well as to judge the existence of the primary user. Due to the channel fading,the perception channel between the primary user and the node is time-varying. Propose a multiple time slots detection model in this paper. The node independently detects the status of author-ized spectrum in each time slot and fuses and judges results of each time slot,the cluster head fuses the results after receiving the judgment transmitted by each node to obtain the judgment results,and then cluster heads will transmit each judgment results to the fusion center,the fusion center gets final judgment result by fusing. Therefore require three steps,the advantage not only can obtain spatial diversity,but al-so can acquire time diversity. And the number of clusters and perception of time slot is optimized,to achieve the maximum of the ratio of throughput to energy consumption. According to the simulation results,on the premise that primary users are fully protected,when the number of perception of time slot and the number of clusters achieve the optimal value,the ratio of throughput to energy consumption a-chieves the maximum.