Underlay认知下时频重叠信号的分量个数估计
发布时间:2018-03-30 00:10
本文选题:认知无线电 切入点:参数估计 出处:《西安电子科技大学学报》2017年06期
【摘要】:针对在低信噪比环境,underlay频谱共享方式下时频重叠信号的信号分量个数估计性能低的问题,提出了一种时频重叠信号的信号分量个数的估计新方法.该方法首先利用动态延时构造出虚拟阵列信号,然后利用噪声奇异值变化不大的特点构造特征量和估计准则,从而估计出underlay频谱共享方式下时频重叠信号的信号分量个数.仿真结果表明,所提方法在低信噪比和高频谱重叠率条件下,比现有方法的估计性能更好.
[Abstract]:Aiming at the problem of low performance of estimating the number of signal components of time-frequency overlapped signals in low signal-to-noise ratio (SNR) environment, In this paper, a new method for estimating the number of signal components of time-frequency overlapping signals is proposed. Firstly, a virtual array signal is constructed by using dynamic delay, and then a characteristic quantity and an estimation criterion are constructed by using the feature that the singular value of noise changes little. The simulation results show that the proposed method has better estimation performance than the existing methods under the condition of low SNR and high spectral overlap rate.
【作者单位】: 西安电子科技大学信息感知技术协同创新中心;南京理工大学电子工程与光电技术学院;徐州雷奥医疗设备有限公司;
【基金】:国家自然科学基金资助项目(61501348,61271299) 国家博士后科学基金资助项目(2017M611912) 陕西省自然科学基础研究计划资助项目(2016JQ6039) 江苏省博士后科研资助项目(1701059B) 高等学校学科创新引智计划资助项目(B08038)
【分类号】:TN911.7
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