针对光散射通信存在严重的多径衰落及噪声干扰, 提出了一种基于空间分集接收, 并采用三阶累积量及互相关滤波的信号检测方法。该方法使用两路探测器同时接收信号, 并分别计算采集信号的自三阶累积量对角切片, 之后对两路信号进行互相关滤波。实验结果表明, 在接收信号信噪比低至-25dB时, 该方法仍可抑制噪声干扰, 正确提取信号频率特征, 且对设备要求不高, 操作简便, 能够实现强噪声中的实时光散射信号的检测。

A signal examination method is put forward in order to reduce the influence of fading and noise, which is especially suitable for optical scattering communication. According to the theory of spacial diversity, the signals are received by two detectors at the same time, and their third-order cumulant diagonal slices are calculated respectively. Then cross-correlation filter is used to improve their SNR. Experimental results show that this method can obtain the frequencies of signals accurately even if the SNR of received signals are as low as -25dB. It proves to be practical and adequate in the development of real-time optical scattering communication in intensive noise.