双选择性衰落信道下的频谱感知
Spectrum Sensing over Doubly-Selective Fading Channels
投稿时间:2014-12-02  修订日期:2014-12-02
DOI:
中文关键词: 认知无线电  双选择性衰落信道  频谱感知  基扩展模型  自适应速度
英文关键词: cognitive radio  doubly-selective fading channels  spectrum sensing  basis expansion model  adaptive speed
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
作者单位E-mail
朱翠涛 中南民族大学 电子信息工程学院 cuitaozhu@mail.scuec.edu.cn 
刘文博 中南民族大学 电子信息工程学院  
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中文摘要:
      为了提高双选择性衰落信道环境下频谱感知性能,提出了一种基于改进的复指数基扩展模型进行信道建模的频谱检测方法。该方法是在一般的复指数基扩展模型的基础上,为了能更好地反映出信道的真实特性,采用一种能自适应移动速度的基函数。在恒虚警概率条件下,利用接收信号的循环特征,对授权用户的频谱进行感知。实验结果表明,在低信噪比和认知用户移动速度不断变化的环境下该方法有较好的检测性能。
英文摘要:
      For the purpose of improving the spectrum sensing performance over doubly-selective fading channels, putting forward a spectrum detection method for channel modeling based on the modified complex exponential basis expansion model. For better reflecting the facticity of the channel, on the basis of complex exponential basis expansion model, adopting the basis function which can adaptive to translational speed. Under the conditions of constant false alarm rate, using the cyclostationary feature of received signal to get the spectrum detection of authorized user. The simulation results show that, this method will get better detection performance when the low SNR and CR users are in a dynamic moving speed environment.
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