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在对数字通信信道进行常规的性能鉴定时,检测其误差率和信号波形是可供选用的两种方法。但是关于数字信道对被传输信号的作用影响,误差率并不能为我们提供深入的了解,而在多数情况下,我们对信号波形做出解释时所采用的种种隐含的假设前提,其正确与否也是难以断定的。为了对常规测试方法进行补充加强并对其缺点进行改进,已发展起一种全面的测试手段,用这种方法可直接获得脉冲波形的参数(前沿、后沿的时间抖动,斜率及峰值)的统计分布规律,而不仅仅是收集严重退化了的波形。所得的统计分布函数几乎可说是包括了对噪声过程的完整描述,进而揭示了噪声产生过程的机理。采用这一检测方法,可成功地测出小于10PS(FWHM)的高斯分布性质的时间抖动。
When performing routine characterization of digital communication channels, the detection of the error rate and signal waveform are two options available. However, the influence of the digital channel on the transmitted signal does not give us an in-depth understanding of the error rate. In many cases, the implicit assumptions we made in interpreting the signal waveform are correct. No is hard to tell. In order to complement the conventional test methods and improve their shortcomings, a comprehensive test method has been developed in which the parameters of the pulse waveform (leading edge, trailing edge jitter, slope and peak) can be directly obtained Statistical distribution of the law, not just the collection of severely degraded waveforms. The resulting statistical distribution function can almost be said to include a complete description of the noise process, thus revealing the mechanism of the noise generation process. With this detection method, the time jitter of the Gaussian distribution nature of less than 10 PS (FWHM) can be successfully measured.