Build non-HT PPDUs by using the waveform generator function or by building each field individually.
Create a non-HT configuration object.
nht = wlanNonHTConfig;
Generate the non-HT PPDU. The length of the input data sequence in bits must be 8 times the length of the PSDU, which is expressed in bytes. Turn off windowing.
x = randi([0 1],nht.PSDULength*8,1); y = wlanWaveformGenerator(x,nht,'WindowTransitionTime',0);
Plot the magnitude of the waveform.
t = ((1:length(y))'-1)/20e6; plot(t,abs(y)) xlabel('Time (s)') ylabel('Magnitude (V)')
Create L-STF, L-LTF, and L-SIG preamble fields.
lstf = wlanLSTF(nht); lltf = wlanLLTF(nht); lsig = wlanLSIG(nht);
Generate the Non-HT-data field using input data field
x, which was used as the input to the waveform generator.
nhtData = wlanNonHTData(x,nht);
Concatenate the individual fields to create a single PPDU.
z = [lstf; lltf; lsig; nhtData];
Verify that the PPDUs created by the two methods are identical.
ans = logical 1