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# step

System object: comm.OQPSKModulator
Package: comm

Modulate using OQPSK method

Y = step(H,X)

## Description

Y = step(H,X) modulates input data, X, with the OQPSK modulator object, H, and returns baseband modulated output, Y. Depending on the value of the BitInput property, input X can be an integer or bit valued column vector with numeric, logical, or fixed-point data types.

The OQPSK modulator object upsamples by a factor of two. The step method outputs the length, Y, as 2$×$N, where N is the length of the input, X. The step method outputs an initial condition of zero, which is unrelated to the input values.

 Note:   H 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.