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频谱感知是认知无线电中非常重要的研究课题,它要保证从用户不会对主用户产生干扰。如果没有主用户信号的信息,能量检测是一种最优的频谱感知方法。根据频谱感知能量检测器的系统模型和判决统计量的统计特性,本文推导了能量检测器的虚警概率和检测概率的解析表达式,并进行了仿真验证。仿真结果表明,信噪比和时间带宽积是影响检测性能的两个最重要的因素,且在低信噪比下,通过增加时间带宽积可以显著提高检测性能。
Spectrum sensing is a very important research topic in cognitive radio, it must ensure that from the user does not interfere with the main user. Without the information of the primary user signal, energy detection is an optimal spectrum sensing method. According to the statistical characteristics of the system model and the decision statistic of the spectrum-aware energy detector, the analytical expressions of the false alarm probability and the detection probability of the energy detector are derived and verified by simulation. The simulation results show that signal-to-noise ratio (SNR) and time-bandwidth product are the two most important factors that affect the detection performance. At low signal-to-noise ratio, the detection performance can be significantly improved by increasing the time-bandwidth product.