Generate eye diagram
eyediagram(x,n)
eyediagram(x,n,period)
eyediagram(x,n,period,offset)
eyediagram(x,n,period,offset,plotstring)
eyediagram(x,n,period,offset,plotstring,h)
h = eyediagram(...)
eyediagram(x,n)
creates
an eye diagram for the signal x
, plotting n
samples
in each trace. n
must be an integer greater than
1. The labels on the horizontal axis of the diagram range between
-1/2 and 1/2. The function assumes that the first value of the signal,
and every n
th value thereafter, occur at integer
times. The interpretation of x
and the number of
plots depend on the shape and complexity of x
:
If x
is a real two-column matrix, eyediagram
interprets
the first column as in-phase components and the second column as quadrature
components. The two components appear in different subplots of a single
figure window.
If x
is a complex vector, eyediagram
interprets
the real part as in-phase components and the imaginary part as quadrature
components. The two components appear in different subplots of a single
figure window.
If x is a real vector, eyediagram
interprets
it as a real signal. The figure window contains a single plot.
eyediagram(x,n,period)
is
the same as the syntax above, except that the labels on the horizontal
axis range between -period/2
and period/2
.
eyediagram(x,n,period,offset)
is
the same as the syntax above, except that the function assumes that
the (offset+1
)st value of the signal, and every n
th
value thereafter, occur at times that are integer multiples of period
.
The variable offset
must be a nonnegative integer
between 0 and n-1
.
eyediagram(x,n,period,offset,plotstring)
is
the same as the syntax above, except that plotstring
determines
the plotting symbol, line type, and color for the plot. plotstring
is
a string whose format and meaning are the same as in the plot
function. The default string is 'b-'
,
which produces a blue solid line.
eyediagram(x,n,period,offset,plotstring,h)
is
the same as the syntax above, except that the eye diagram is in the
figure whose handle is h
, rather than in a new
figure. h
must be a handle to a figure that eyediagram
previously
generated.
Note:
You cannot use |
h = eyediagram(...)
is
the same as the earlier syntaxes, except that h
is
the handle to the figure that contains the eye diagram.
For an online demonstration, type showdemo scattereyedemo
.