基于能量-循环平稳特征的联合频谱检测方法

Joint Spectrum Sensing Method Based on Energy and Cyclostationary Feature

根据能量检测与循环平稳特征检测的特点,提出了基于双门限的能量-循环平稳特征的联合频谱检测方法。该方法利用双门限的能量检测法进行粗检,若能量落在两门限的两端,则直接进行判断;若能量落在两门限之间,则利用循环平稳特征进行检测。仿真结果表明,无论是在噪声确定或不确定的情况下,与循环平稳特征检测方法相比,该方法在保证检测性能下降不多的情况下,大大降低了计算复杂度;与能量检测方法相比,该方法在复杂度增加不多的情况下,有效提高了检测性能。

According to the characteristics of the energy detection and cyclostationary feature detection method, a new joint spectrum sensing method is proposed based on double threshold. Firstly, two thresholds are determined and coarse detection is performed. If energy is greater than high threshold or less than low threshold, energy detection can make a direct decision. Then if the energy is located between the two thresholds, cyclostationary feature detection is adopted for further sensing to determine whether the primary user is absent. Simulation results show that, compared with the cyclostationary feature detection, our new proposed scheme can greatly reduce the complexity at the cost of only a small decline in detection performance. Compared with the energy detection, the detection performance of the proposed method is much better than energy detection under the condition of a small increase in complexity.