Build VHT PPDUs by using the waveform generator function or by building each field individually.
Create a VHT configuration object.
vht = wlanVHTConfig;
Generate the VHT 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],vht.PSDULength*8,1); y = wlanWaveformGenerator(x,vht,'WindowTransitionTime',0);
Plot the magnitude of the waveform.
t = ((1:length(y))'-1)/80e6; plot(t,abs(y)) xlabel('Time (s)') ylabel('Magnitude (V)')
Create L-STF, L-LTF, L-SIG, VHT-SIG-A, VHT-STF, VHT-LTF, and VHT-SIG-B preamble fields.
lstf = wlanLSTF(vht); lltf = wlanLLTF(vht); lsig = wlanLSIG(vht); vhtSigA = wlanVHTSIGA(vht); vhtstf = wlanVHTSTF(vht); vhtltf = wlanVHTLTF(vht); vhtSigB = wlanVHTSIGB(vht);
Generate the VHT-Data field using input data field
x, which was used as an input to the waveform generator.
vhtData = wlanVHTData(x,vht);
Concatenate the individual fields to create a single PPDU.
z = [lstf; lltf; lsig; vhtSigA; vhtstf; vhtltf; vhtSigB; vhtData];
Verify that the PPDUs created by the two methods are identical.
ans = logical 1