Eye diagram refers to the graph observed on the oscilloscope when the performance of transmission system is estimated and improved (adjusted) by experimental methods. The way to observe the eye diagram is to connect an oscilloscope across the output end of the receiving filter, and then adjust the scanning period of the oscilloscope to synchronize the horizontal scanning period of the oscilloscope with the period of receiving symbols. At this time, the graphics seen on the oscilloscope screen look like human eyes, so it is called "eye diagram". The influence of inter-symbol crosstalk and noise can be observed from the "eye diagram" to estimate the quality of the system. In addition, the diagram can also be used to adjust the characteristics of the receiving filter to reduce inter-symbol interference and improve the transmission performance of the system. The cause of eye diagram is that each symbol waveform obtained by scanning will overlap together, thus forming an eye diagram. Generally speaking, it is an anti-interference option.
Adopt it