System object: comm.MER
Package: comm
Measure modulation error ratio
Note
Starting in R2016b, instead of using the step method
to perform the operation defined by the System object™, you can
call the object with arguments, as if it were a function. For example, y
= step(obj,x) and y = obj(x) perform
equivalent operations.
MERDB= step(MER,REFSYM,RXSYM) returns the
measured MER, MERDB, of the received signal RXSYM,
based on reference signal REFSYM. MER values are
measured in dB.
REFSYM. REFSYM and RXSYM inputs
are complex column vectors of equal dimensions and data type. The
data type can be double, single, signed integer, or signed fixed point
with power-of-two slope and zero bias. All outputs of the object are
of data type double. To set the interval over which
the MER is measured, use the MeasurementIntervalSource and MeasurementInterval properties.
MERDB = step(MER,RXSYM) returns the measured
MER of received signal RXSYM based on a reference
signal specified in the ReceivedConstellation property.
[___,MINMER] = step(___) returns
the minimum MER, MINMER, given either of the two
previous syntaxes.
To return minimum MER, set the MinimumMEROutputPort property
to true. To set the interval over which MINMER is
measured, use the MeasurementIntervalSource and MeasurementInterval properties.
[___,XMER] = step(___) returns
the X-percentile MER, XMER.
To return the X-percentile MER, set the XPercentileMEROutputPort property
to true. XMER is the MER above
which X% of the measurements fall, where X is
set by the XPercentileValue property. XMER is
measured using all the input frames since the last reset.
[___,NUMSYM] = step(___) returns
the number of symbols, NUMSYM, used to calculate
the X-percentile MER.
To return NUMSYM, set the SymbolCountOutputPort to true. NUMSYM is
measured using all the input frames since the last reset.
Note
MER specifies the System object on
which to run this step method.
The object performs an initialization the first time the step method
is executed. This initialization locks nontunable
properties and input specifications, such as dimensions, complexity,
and data type of the input data. If you change a nontunable property
or an input specification, the System object issues an error.
To change nontunable properties or inputs, you must first call the release method
to unlock the object.