eyeArea

Measure eye area

Since R2024a

Syntax

a = eyeArea(obj)

a = eyeArea(obj,index)

a = eyeArea(___,Name=Value)

Description

a = eyeArea(obj) measures the eye area of the eye diagram or eye contour object obj.

a = eyeArea(obj,index) measures the eye area of the eye diagram or eye contour object obj at the index specified by index.

a = eyeArea(___,Name=Value) measures the eye area using one or more name-value pair arguments in addition to the input argument in the previous syntax. Unspecified arguments take default values.

Input Arguments

obj — Eye diagram or eye contour object

eyeDiagramSI object | eyeContour object

Eye diagram or eye contour object, specified as an eyeDiagramSI System object™ or an eyeContour object.

index — Index at which eye area is calculated

scalar

Index at which the function calculates the eye area, specified as a scalar. The function indexes the lowest eye opening as 1.

Data Types: double

Name-Value Arguments

Specify optional pairs of arguments as Name1=Value1,...,NameN=ValueN, where Name is the argument name and Value is the corresponding value. Name-value arguments must appear after other arguments, but the order of the pairs does not matter.

Example: a = eyeArea(obj,Plot=on) displays the plot of the eye diagram from the obj eye pattern object showing the eye area.

SER — Symbol error rate

0 | scalar

Symbol error rate for generating contours to measure eye area, specified as a scalar.

If the input object obj is an eye diagram object, you can define the SER value using this argument. If the input object obj is an eye contour object, the function uses the SER value set in the eye contour object and ignores this argument.

Data Types: double

Extrapolation — Extrapolation method

none (default) | dualdirac | gaussian | linear | spline | pchip | makima

Extrapolation method for generating contours for generating contours to measure eye area. For more information, see Extrapolation (Mixed-Signal Blockset).

If the input object obj is an eye diagram object, you can define the Extrapolation method using this argument. If the input object obj is an eye contour object, the function uses the Extrapolation method set in the eye contour object and ignores this argument.

Data Types: char

TimeUnit — Unit for time coordinates

Seconds (default) | Samples | UI

Unit for the time coordinates for the calculation of the eye area.

Data Types: char

Plot — Display eye area on plot

off (default) | on

Display a plot of the eye diagram showing the eye area.

Data Types: char

Output Arguments

a — Measured eye area

column vector

Measured eye area for each eye in the diagram, returned as a column vector. The function indexes the eye openings from the lowest center amplitude to the highest.

Version History

Introduced in R2024a