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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。
Aiming at the serious multipath fading and noise interference in light scattering communication, a signal detection method based on spatial diversity reception and using third-order cumulant and cross-correlation filtering is proposed. The method uses two detectors to receive signals at the same time, and calculates the diagonal slices of the collected signals from the third-order cumulants respectively. Then the two signals are filtered by cross-correlation. The experimental results show that this method can still suppress the noise interference when the signal-to-noise ratio of the received signal is as low as -25dB, and can extract the frequency characteristics of the signal correctly, and has low requirements on the equipment and is easy to operate. The real-time light scattering signal The test.