一种认知无线网络中的协作感知优化方法

摘要

Cognitive radio is being investigated widely as a mean to increase the efficiency of spectrum usage.Spectrum sensing is of significant importance in cognitive radio network.There are two factors associated with spectrum sensing: determine which portions of the spectrum are available rapidly and vacate the spectrum when a licensed user is appeared.A multilayer hierarchy technique in implementing the multiuser cooperative spectrum sensing is proposed , and this technique is proved mathematically.Computer simulation shows an improvement of the network throughput by using the proposed cooperative spectrum sensing in cognitive radio networks.%认知无线电技术能够显著提高频谱资源的利用率,因此越来越受到学术界的关注.频谱感知是认知无线电的基础,一方面它要求能够快速找到可用频谱,另一方面当授权用户返回时又要求能够快速释放信道避免干扰.提出了一种认知无线网络中多用户协作感知分级方法,并通过数学推导给出最优的分级策略.仿真结果表明,采用所提出的协作频谱感知方法,能够提高认知无线网络的吞吐量.