Joint Sub-Nyquist Spectrum Sensing Scheme With Geolocation Database Over TV White Space
Joint Sub-Nyquist Spectrum Sensing Scheme With Geolocation Database Over TV White Space
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DOI：
10.1109/tvt.2017.2776560
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发表时间：
2018-05
影响因子：
6.8
通讯作者：
Yuan Ma;Xingjian Zhang;Yue Gao
中科院分区：
文献类型：
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作者：
Yuan Ma;Xingjian Zhang;Yue Gao
为了最大化白色空间设备的频谱接入机会，将实时频谱感知与地理位置数据库相结合是一种有前途的方法，以提高检测分辨率，降低计算复杂度。需要先进的频谱感测技术来快速准确地识别宽频率范围内的频谱占用。然而，宽带信号采集和处理的严格要求对能量存储和计算能力有限的紧凑型设备提出了重大的实现挑战。本文提出了一种混合方案的亚奈奎斯特宽带频谱感知与地理位置数据库，以实现准确的检测周围的频谱，减少所需的测量和计算复杂度。两个迭代算法进行修改，以纳入先验信息的地理位置数据库，因此，使频谱感测仅在有限数量的潜在空闲信道上的电视白色空间。理论分析和仿真结果表明，该联合方案在提高检测性能的同时，降低了所需的采样率，加快了感知过程，同时通过宽带频谱感知更新信道信息，降低了动态现任用户受到干扰的风险。
To maximize spectrum access opportunities for white space devices, incorporating real-time spectrum sensing with geolocation database is a promising approach to enhance detection resolution with reduced computation complexity. Advanced spectrum sensing techniques are needed to quickly and accurately identify spectrum occupancy over a wide frequency range. However, the stringent requirements from wideband signal acquisition and processing pose a major implementation challenge in compact devices with limited energy storage and computation capabilities. In this paper, a hybrid scheme of sub-Nyquist wideband spectrum sensing with geolocation database is proposed to achieve accurate detection of the surrounding spectrum with reduced number of required measurements and computation complexity. Two iterative algorithms are modified to incorporate a priori information from geolocation database, therefore enabling spectrum sensing to be performed only on a limited number of potentially vacant channels over TV white space. Theoretical analyses and simulation results show that the proposed joint scheme speeds up the sensing process with enhanced detection performance and smaller required sampling rate, whereas the updated channel information from wideband spectrum sensing reduces the risk of interferences to the dynamic incumbent users.