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System object: comm.PhaseFrequencyOffset
Package: comm

Apply phase and frequency offsets to input signal


Y = step(H,X)
Y = step(H,X,FRQ)



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) applies phase and frequency offsets to input X, and returns Y. The input X is a double or single precision matrix X, of dimensions MxN. M is the number of time samples in the input signals and N is number of channels. Both M and N can be equal to 1. The object adds phase and frequency offsets independently to each column of X. The data type and dimensions of X and Y are the same.

Y = step(H,X,FRQ) uses FRQ as the frequency offset that the object applies to input X when you set the FrequencyOffsetSource property to 'Input port'. When the X input is an MxN matrix, the value for FRQ can be a numeric scalar, an Mx1 or 1xN numeric vector, or an MxN numeric matrix. When the FRQ input is a scalar, the object applies a constant frequency offset, FRQ, to each column of X. When the FRQ input is an Mx1 vector, the object applies time varying frequency offsets, which are specified in the FRQ vector, to each column of X. When the FRQ input is a 1xN vector, the object applies the ith constant frequency offset in FRQ to the ith column of X. When the FRQ input is an MxN matrix, the object applies the ith time varying frequency offsets, specified in the ith column of FRQ, to the ith column of X.


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.

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