Build HT PPDUs by using the waveform generator function or by building each field individually.
Create an HT configuration object.
ht = wlanHTConfig;
Generate the 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 windowing off.
x = randi([0 1],ht.PSDULength*8,1); y = wlanWaveformGenerator(x,ht,'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, L-SIG, HT-SIG, HT-STF, and HT-LTF preamble fields.
lstf = wlanLSTF(ht); lltf = wlanLLTF(ht); lsig = wlanLSIG(ht); htsig = wlanHTSIG(ht); htstf = wlanHTSTF(ht); htltf = wlanHTLTF(ht);
Generate the HT-Data field using input data field
x, which is the same input signal that was used with the waveform generator.
htData = wlanHTData(x,ht);
Concatenate the individual fields to create a single PPDU.
z = [lstf; lltf; lsig; htsig; htstf; htltf; htData];
Verify that the PPDUs created by the two methods are identical.
ans = logical 1