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System object: phased.PhaseCodedWaveform
Package: phased

Samples of phase-coded waveform


Y = step(sPCW)
Y = step(sPCW,prfidx)


    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. When the only argument to the step method is the System object itself, replace y = step(obj) by y = obj().

Y = step(sPCW) returns samples of the phase-coded pulse in a column vector, Y.

Y = step(sPCW,prfidx), uses the prfidx index to select the PRF from the predefined vector of values specified by in the PRF property. This syntax applies when you set the PRFSelectionInputPort property to true.

    Note:   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.

Input Arguments


Phase-coded waveform object.

Output Arguments


Column vector containing the waveform samples.


expand all

Generate samples of two pulses of a phase-coded pulse waveform that uses the Zadoff-Chu code.

sPCW = phased.PhaseCodedWaveform('Code','Zadoff-Chu',...
wav = step(sPCW);
fs = sPCW.SampleRate;
nsamps = size(wav,1);
t = [0:(nsamps-1)]/fs;
title('Waveform: Real Part')
xlabel('Time (\mu sec)')

Create and plot two-pulse phase-coded waveforms that uses the Zadoff-Chu code. Set the sample rate to 1 MHz, a chip width of 5 microseconds, 16 chips per pulse. Vary the pulse repetition frequency.

fs = 1e6;
PRF = [5000,10000];
waveform = phased.PhaseCodedWaveform('SampleRate',fs,...

Obtain and plot the phsed-coded waveforms. For the first call to the step method, set the PRF to 10kHz using the PRF index. For the next call, set the PRF to 25 kHz. For the final call, set the PRF to 10kHz.

wav = [];
wav1 = waveform(1);
wav = [wav; wav1];
wav1 = waveform(2);
wav = [wav; wav1];
wav1 = waveform(1);
wav = [wav; wav1];
nsamps = size(wav,1);
t = [0:(nsamps-1)]/fs;
xlabel('Time (\mu sec)')

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