融合帧间相关性的能量检测方法

Energy Detection Combined with Interframe Correlation

针对能量检测在信噪比较低、噪声具有不确定性时检测性能明显下降的问题,着眼于单一用户,提出了融合帧间相关性的能量检测方法。该方法在不增加感知用户的前提下,通过增加相关统计量参数,分析不同时刻帧间信号的相关性,来辅助能量检测进行主用户存在性的判别。仿真结果表明,该方法与直接进行能量检测方法相比,在虚警概率等于0.1,检测概率不低于90%时,所需的信噪比降低了约1dB。单一用户的检测性能可以接近用户数为2时的双门限协作感知性能。该方法对角度调制信号的适应性优于幅度调制信号。

Aiming at the problem that the detection performance of energy detection is obviously decreased when the SNR is low and the uncertainty of noise exists,an energy detection method combined with frame correlation was proposed.In this method,without any cognitive users increase,by increasing the related statistic parameters,the correlation of signals between different time frame was analyzed to assist the energy detection criterion of the existence of primary users.Simulation results showed that,compared to the direct energy detection method,the proposed method desired signal-to-noise ratio was reduced by about 1 dB while false alarm probability was 0.1,and the detection probability was not less than 90%.In this method,the detection performance of single user was close to the two-threshold collaborative perceptive performance of the number of users at 2.This method had better adaptability to angle modulated signal than amplitude modulated signal.