摘要： 针对现有三种频谱感知技术的局限性，提出了一种基于采样信号占用度的频谱感知方法，通过提取采样信号的特征值来计算采样时段内的频谱占用度，并以此判决信号是否存在，实现了较低信噪比下的频谱感知。通过蒙特卡罗仿真和实际检测实验，验证了该方法在实际应用中的有效性。

中图分类号： TN911
文献标识码： A
文章编号： 0258-7998(2010)12-0111-03

Spectrum sensing based on sampled signal occupancy

Abstract： Aiming at the limitations of existing spectrum sensing technologies, we propose a new method based on sampled signal occupancy. This method uses digital characteristics of signal to calculate spectrum occupancy within sampling time, and then detects the existence of signal according to the occupancy. Therefore, it can work on a low SNR. Monte Carlo simulation and real experiment results confirm its effectiveness in practical situation.

Key words : cognitive radio; spectrum sensing; signal characteristics; sampled signal occupancy