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System object: comm.TurboDecoder
Package: comm

Decode input signal using parallel concatenated decoding scheme


Y = step(H,X)



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 the input data, X, using the parallel concatenated convolutional coding scheme that you specify using the TrellisStructure and InterleaverIndices properties. It returns the binary decoded data, Y. Both X and Y are column vectors of double precision data type. When the constituent convolutional code represents a rate 1/N code, the step method sets the length of the output vector, Y, to (M-2*numTails)/(2*N-1), where M represents the input vector length and numTails is given by log2(TrellisStructure.numStates)*N. The output length, L, is the same as the length of the interleaver indices.

Y = step(H, X, INTERLVRINDICES) uses the INTERLVRINDICES specified as an input. INTERLVRINDICES is a column vector containing integer values from 1 to L with no repeated values. The lengths of the INTERLVRINDICES input and the Y output are the same.


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 (MATLAB) 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.