Cooperative Spectrum Sensing: A Blind and Soft Fusion Detector
Cooperative Spectrum Sensing: A Blind and Soft Fusion Detector
复制标题
协作光谱传感：盲软融合探测器
DOI：
10.1109/twc.2018.2801833
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发表时间：
2018-02
影响因子：
10.4
通讯作者：
Youming Li
中科院分区：
文献类型：
--
作者：
Jingwen Tong;Ming Jin;Qinghua Guo;Youming Li
利用认知无线电（CR）网络中的空间分异，研究了协同频谱感知技术，以解决隐性终端问题。本文研究了一种基于软融合的盲协同频谱感知方法，该方法不具备信道和主信号的先验知识，将软信息从每个辅助用户发送到融合中心进行检测。我们首先引入Quade测试来设计盲检测器。然后，推导出一种计算复杂度较低、开销较低的检测器，该检测器只需要在聚变中心估计每个SU的功率和瞬时功率的方差。推导了该检测器检测性能的虚警概率和检测概率解析表达式。仿真结果验证了理论分析，并证明了该探测器与现有探测器相比具有优越的性能。研究还表明，随着CR中隐藏端子数量的增加，该检测器可以保持较高的检测性能，而传统检测器的性能下降较快。
Cooperative spectrum sensing has been studied to combat the hidden terminal problem by exploiting the spatial diversity in cognitive radio (CR) networks. This paper concerns blind cooperative spectrum sensing with soft fusion, where the a priori knowledge of channels and primary signals is unavailable, and soft information is transmitted from each secondary user (SU) to a fusion center for detection. We first introduce the Quade test to design a blind detector. Then, a new detector with both lower computational complexity and lower overhead is derived, where only the estimated power and the variance of the instantaneous power at each SU are required at the fusion center. The analytical expressions for the detection performance, in terms of false-alarm probability and detection probability, are derived for the proposed detector. Simulation results are provided to validate the theoretical analyses and demonstrate the superior performance of proposed detector compared to the state-of-the-art detectors. It is also shown that, with the increase of the number of hidden terminals in the CR, the proposed detector can maintain high detection performance while the conventional detectors exhibit rapid performance degradation.
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