comm.RectangularQAMTCMModulator
Convolutionally encode binary data and map using rectangular QAM signal constellation
Description
The RectangularQAMTCMModulator
object implements
trellis-coded modulation (TCM) by convolutionally encoding the binary
input signal and mapping the result to a rectangular QAM signal constellation.
To convolutionally encode binary data and map the result using a rectangular QAM constellation:
Define and set up your rectangular QAM TCM modulator object. See Construction.
Call
step
to modulate the signal according to the properties ofcomm.RectangularQAMTCMModulator
. The behavior ofstep
is specific to each object in the toolbox.
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.
Construction
H = comm.RectangularQAMTCMModulator
creates
a trellis-coded, rectangular, quadrature amplitude (QAM TCM) System object, H
.
This object convolutionally encodes a binary input signal and maps
the result to a rectangular QAM constellation.
H = comm.RectangularQAMTCMModulator(
creates
a rectangular QAM TCM modulator object, Name
,Value
)H
, with
each specified property set to the specified value. You can specify
additional name-value pair arguments in any order as (Name1
,Value1
,...,NameN
,ValueN
).
H = comm.RectangularQAMTCMModulator(TRELLIS,
creates
a rectangular QAM TCM modulator object, Name
,Value
)H
. This
object has the TrellisStructure
property set to TRELLIS
and
the other specified properties set to the specified values.
Properties
|
Trellis structure of convolutional code Specify trellis as a MATLAB structure that contains the trellis
description of the convolutional code. Use the |
|
Termination method of encoded frame Specify the termination method as When you set this property to When you set this property to When you set this property to |
|
Enable modulator reset input Set this property to true to enable an additional input to the step method. The default is
|
|
Number of points in signal constellation Specify the number of points in the signal constellation used to map the convolutionally
encoded data as a positive integer scalar value equal to
|
|
Data type of output Specify the output data type as one of |
Methods
step | Convolutionally encode binary data and map using rectangular QAM constellation |
Examples
Algorithms
This object implements the algorithm, inputs, and outputs described on the Rectangular QAM TCM Encoder block reference page. The object properties correspond to the block parameters.
Extended Capabilities
Version History
Introduced in R2012a