3.5 GHz Environmental Sensing Capability Detection Thresholds and Deployment.
3.5 GHz Environmental Sensing Capability Detection Thresholds and Deployment.
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DOI：
10.1109/tccn.2017.2748121
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发表时间：
2017-09
影响因子：
8.6
通讯作者：
Hall TA
中科院分区：
文献类型：
--
作者：
Nguyen TT;Souryal MR;Sahoo A;Hall TA
美国沿海地区商业用户和政府用户在3.5GHz频段的频谱共享取决于一种环境感知能力（ESC）——即一个射频传感器网络和一个决策系统——以检测现有舰载雷达系统的存在，并在必要时触发保护措施。众所周知，这些传感器的灵敏度取决于商业系统对现有雷达接收器产生的总干扰，但到目前为止，还没有对实际场景中的总干扰及其对雷达信号检测要求的影响进行全面研究。本文提出了确定ESC传感器放置位置及其检测阈值的系统方法，以充分保护现有舰载雷达系统免受有害干扰。通过基于地形的传播模型和基于总体的部署模型，分析得出了必须触发保护的近海距离，并将其与海岸线传感器的检测水平相关联。我们进一步表明，传感器放置是著名的集合覆盖问题的一种形式，该问题已被证明是NP完全问题，并展示了用贪心算法实现的实用解决方案。结果表明，检测阈值比当前行业标准要求的低22dB之多。本文提出的方法和结果可供ESC运营商用于传感器的规划和部署，也可供监管机构用于测试传感器性能。
Spectrum sharing in the 3.5 GHz band between commercial and government users along U.S. coastal areas depends on an environmental sensing capability (ESC)—that is, a network of radio frequency sensors and a decision system—to detect the presence of incumbent shipborne radar systems and trigger protective measures, as needed. It is well known that the sensitivity of these sensors depends on the aggregate interference generated by commercial systems to the incumbent radar receivers, but to date no comprehensive study has been made of the aggregate interference in realistic scenarios and its impact on the requirement for detection of the radar signal. This paper presents systematic methods for determining the placement of ESC sensors and their detection thresholds to adequately protect incumbent shipborne radar systems from harmful interference. Using terrain-based propagation models and a population-based deployment model, the analysis finds the offshore distances at which protection must be triggered and relates these to the detection levels of coastline sensors. We further show that sensor placement is a form of the well-known set cover problem, which has been shown to be NP-complete, and demonstrate practical solutions achieved with a greedy algorithm. Results show detection thresholds to be as much as 22 dB lower than required by current industry standards. The methodology and results presented in this paper can be used by ESC operators for planning and deployment of sensors and by regulators for testing sensor performance.