Eye Diagrams
Section Overview
An eye diagram is a simple and convenient tool for studying
the effects of intersymbol interference and other channel impairments
in digital transmission. To construct an eye diagram, plot the received
signal against time on a fixed-interval axis. At the end of the fixed
time interval, wrap around to the beginning of the time axis. The
resulting diagram consists of many overlapping curves.
To obtain a more useful eye diagram, create vertical histograms
of the input signal. A vertical histogram is defined as the histogram
of the amplitude crossings of the input signal at a given time. The
eye diagram can be constructed by combining a series of vertical histograms
from zero to T seconds, where T is
a multiple of the symbol duration.
To produce an eye diagram from a signal, use the commscope.eyediagram object. For more information,
see the reference page for commscope.eyediagram,
and the demo, scattereyedemo.
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EyeScope
Use EyeScope to examine eye diagram results in a user-friendly,
graphical environment. EyeScope shows both the eye diagram figure
and measurement results in a unified GUI, providing a more efficient
means for viewing results.
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