System object: comm.gpu.ViterbiDecoder
Package: comm
Decode convolutionally encoded data using Viterbi algorithm
Y = step(H,X)
Y = step(H,X,R)
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.
Y = step(H,X) decodes encoded data, X,
using the Viterbi algorithm and returns Y. X,
must be a column vector with data type and values that depend on how
you set the InputFormat property. If the convolutional
code uses an alphabet of 2^N possible symbols, the length of the input
vector, X, must be L*N for
some positive integer L. Similarly, if the decoded
data uses an alphabet of 2^K possible output symbols, the length of
the output vector, Y, is L*K.
Y = step(H,X,R) resets the internal states
of the decoder when you input a non-zero reset signal, R. R must
be a double precision, single precision or logical scalar. This syntax
applies when you set the TerminationMethod property
to Continuous and the ResetInputPort property
to true.
Note
obj 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.