认知无线网络多用户协同频谱感知协作机制研究

ON COLLABORATION MECHANISM OF MULTIUSER COOPERATIVE SPECTRUM SENSING IN COGNITIVE RADIO NETWORK

认知无线电技术被公认是下一代无线网络的核心架构之一,频谱感知是认知无线电实现的核心手段。通过分析现有的协同频谱感知模型,证明了在多用户进行协同频谱感知的情况下,所有用户进行协同频谱感知所得到总体信道利用率是最高的;进而设计策略促使所有的非授权用户积极进行协同频谱感知,并对所设计的策略进行仿真验证。仿真结果表明,所设计的策略可以有效地促进非授权用户进行协同频谱感知,从而提高频谱资源的整体利用率。

Cognitive radio technology is generally recognised as one of the core architectures of the next generation wireless networks,and the spectrum sensing is the key means of cognitive radio implementation.By analysing existing cooperative spectrum sensing model,we prove that in condition of implementing cooperative spectrum sensing by multiple users,the overall channel utilisation achieves highest rate while all users are taking part in the cooperative spectrum sensing.And then we design the strategy to promote all unauthorised users to actively pursue the cooperative spectrum sensing,and the designed strategy has be verified through the simulation as well.Simulation results show that our strategy can effectively advance the implementation of cooperative spectrum sensing by unauthorised users and thereby increases the overall utilisation of spectrum resources.