基于干扰控制的认知物联网检测时长优化

摘要

为了解决物联网中频谱资源短缺与频谱需求旺盛之间的矛盾,采用认知无线电技术提高频谱利用率被认为是有效的方法. 要保证主要用户的正常运行,如何控制认知用户产生的干扰是需要首先考虑的问题.提出了1种基于干扰控制的认知物联网检测时长调控方案,并设计了1种考虑干扰概率和效率的效用函数,通过优化得到最佳的检测时长.仿真结果表明,获取认知物联网的最优检测时长,可使认知物联网用户造成干扰的概率较小,并且有着较高的使用效率.%In order to solve the contradiction between the shortage of spectrum resource and the growing demands of spectrum, using cognitive radio technology that improves utilization of spectrum resource is regarded as an effective approach in Internet of Things(IoT).To ensure the operation of primary users, how to control the interference introduced by the cognitive IoT users is the problem we need to consider first of all.This paper proposes an adjustment scheme of sensing time based on the interference control in cognitive IoT.An utility function, which can strike a balance between efficiency and interference probability, is designed.Optimal sensing time can therefore be obtained.Simulation results show that the cognitive IoT with optimal sensing time can make users produce less interference and have higher efficiency.