一种认知无线网络中的协作感知优化方法

Optimization Approach for Cooperative Spectrum Sensing in Cognitive Radio Network

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。

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.