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电力干扰噪音是影响电力线载波通信质量的重要因素之一。在小波去噪的方法中,应用最为广泛的是非线性小波变换阈值法。但在有些情况下,如在信号不连续点处,运用阈值法去噪会产生伪吉布斯(Pseudo-Gibbs)现象。在阈值法基础上加以改进的平移不变量小波去噪方法不仅能有效地抑制伪吉布斯现象,而且能减小原始信号和估计信号之间的均方根误差(RMSE),改善信号的信噪比(SNR)。通过仿真实验可以看出,该方法比阈值法有更好的去噪效果。
Power interference noise is one of the important factors affecting the quality of power line carrier communication. In the wavelet denoising method, the most widely used is the nonlinear wavelet transform threshold method. However, in some cases, such as the signal discontinuity, the use of threshold method to generate noise will lead to pseudo-Gibbs (Pseudo-Gibbs) phenomenon. The translation invariant wavelet denoising method based on thresholding method can not only effectively suppress the false Gibbs phenomenon but also reduce the root mean square error (RMSE) between the original signal and the estimated signal and improve the signal of the signal Noise Ratio (SNR). It can be seen through the simulation experiment that the method has a better denoising effect than the threshold method.