vec

Measure vertical eye closure

Since R2024a

Syntax

v = vec(obj)

v = vec(obj,time)

v = vec(___,Name=Value)

Description

v = vec(obj) measures the vertical eye closure (VEC) from the eye diagram object obj.

v = vec(obj,time) measures the vertical eye closure from the eye diagram object obj at the time specified by time.

v = vec(___,Name=Value) measures the vertical eye closure from the eye diagram 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 object

eyeDiagramSI object

Eye diagram object, specified as an eyeDiagramSI System object™.

time — Time when VEC is calculated

scalar

Time at which the function calculates the vertical eye closure, specified as a scalar.

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: v = vec(obj,Extrapolation=Dual-Dirac) uses Dual-Dirac extrapolation method to generate the eye contours for measuring VEC.

SER — Symbol error rate

0 (default) | scalar

Symbol error rate at which the function measures vertical eye closure.

Data Types: double

Extrapolation — Extrapolation method to generate eye contours

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

Extrapolation method to generate eye contours used for measuring vertical eye closure. For more information, see Extrapolation (Mixed-Signal Blockset).

Data Types: char

TimeUnit — Unit for time coordinates for measuring vertical eye closure

Seconds (default) | Samples | UI

Unit for the time coordinates for measuring vertical eye closure.

Data Types: char

Output Arguments

v — Vertical eye closure

vector

Vertical eye closure.

Vertical eye closure is defined as the minimum signal-to-noise ratio across all eye openings where signal amplitude is eye amplitude and noise amplitude is eye height.

Version History

Introduced in R2024a