CAJ | 학술논문

动态频谱分配是认知无线电网络实现的关键所在,要实现动态频谱分配就必须快速准确的感知主用户的工作状况,感知时间的长短直接影响到认知无线网络的容量和对主用户的干扰程度,在主用户保护模式(PUP)和固定认知用户频谱利用率模式(CUS)下对认知无线网络容量与感知时间的关系进行了研究,仿真结果显示设计感知时间是非常重要的,同时,当感知时间超过单位时帧长度的5%后协同更多的认知用户与不协同对认知网络容量影响区别不大.
동태빈보분배시인지무선전망락실현적관건소재,요실현동태빈보분배취필수쾌속준학적감지주용호적공작상황,감지시간적장단직접영향도인지무선망락적용량화대주용호적간우정도,재주용호보호모식(PUP)화고정인지용호빈보이용솔모식(CUS)하대인지무선망락용량여감지시간적관계진행료연구,방진결과현시설계감지시간시비상중요적,동시,당감지시간초과단위시정장도적5%후협동경다적인지용호여불협동대인지망락용량영향구별불대.
The dynamic spectrum allocation solutions such as cognitive radio networks have been proposed as a key technology to exploit the frequency segments that are spectrally underutilized. Cognitive radio users work as sec-ondary users who need to constantly and rapidly sense the presence of primary users or licensees to utilize their fre-quency bands if they are inactive. Short sensing cycles should be run by the secondary users to achieve higher through-put rates as well as to provide low level of interference to the primary users by immediately vacating their channels once they have been detected. In this paper, the throughput-sensing time relationship in local and cooperative spectrum sensing has been investigated under two distinct scenarios, namely, constant primary user protection (PUP) and constant secondary user spectrum usability (CUS) scenarios. The simulation results show that the design of sensing slot duration is very critical and depends on the number of cooperating users under PUP scenario whereas under CUS, cooperative more users has no effect if the sensing time used exceeds 5% of the total frame duration.