基于衰减特性的电缆传输畸变软件补偿

Attenuation Compensation by Software Based on the Character of Transfers of the Cable

探讨了2种用于同轴电缆传输快脉冲信号的软件补偿方法：一种是已知电缆传输衰减特性曲线（实测值）,对其进行数据预处理后进行幅度和相位的同步补偿;另外一种则是把传输衰减特性曲线拟合,近似地认为同轴电缆的衰减在足够高频处与频率的平方根成正比,求出校正波形所需的衰减因子进行数学模型信号补偿。在波形软件补偿中采用了最能体现补偿效果的快沿方波信号,并分析比较了2种方法的优劣及不同应用场合,为不同条件下的选择提供参考。

Two attenuation compensation models of fast pulse transmission in coaxial-cable are introduced.One is the compensation of both of the equalization of amplitude and phase with the practically test data,which is processed by computer;Another method of the attenuation compensation is applying with the mathematical model of the transmission of coaxial-cable using the factor of the attenuation.Which is found by the transfer characteristic curve fitting.Approximation that the attenuation coaxial-cable in a high enough frequency proportional to the square root of frequency.In the waveform compensation using the software that best reflects the compensation effect of the fast along the square wave signal.At last,the comparison of the two methods is given,as well as the suitable conditions of using,it offers references to the choice under different conditions.