基于维纳滤波的同轴电缆脉冲信号传输畸变补偿研究

Signal compensation of coaxial cable based on Wiener filtering method

由于同轴电缆的低通传输特性,脉冲信号在同轴电缆中传输时不可避免地会出现畸变,并且畸变程度会随着脉冲信号频率、带宽以及传输距离的增加而增大。创新性地将图像处理领域中的一种图像复原方法—维纳滤波法应用于脉冲信号同轴电缆传输畸变补偿,仅利用同轴电缆的S参数和输出信号即可完成输入信号的重构。并以10 m同轴电缆为对象,采用该方法分别对双指数脉冲信号、高斯调制脉冲信号、调制方波信号进行传输畸变补偿。结果表明:对于不同样式的信号,该方法均具有优异的补偿性能;并且,与工程上常用的衰减补偿法相比,该方法不仅补偿精度高,还具有高的计算效率,在同轴电缆脉冲信号传输畸变补偿中具有很好的实用价值。

With the increase of signal frequency,bandwidth and transmission distance,the signal distortion problem brought by the low pass transmission characteristics of coaxial cable becomes serious and cannot be ignored.In this article,Wiener filtering method,an image reconstruction method that is usually employed in the field of image processing,is innovatively applied to the signal distortion compensation of coaxial cable.The input signal can be reconstructed only by using the S parameters of coaxial cable and output signal.Three different kinds of pulse signals,i.e.,double exponential pulse signal,Gaussian modulated pulse signal and modulated square wave signal,transmitted in a 10 m coaxial cable were compensated.The results indicate that this method has excellent compensation performance for different kinds of signals.Moreover,compared with the commonly used attenuation compensation method,this method not only possesses high compensation accuracy,but also has outstanding computation efficiency,which is beneficial for practical application in the signal distortion compensation.