Generate VHT-STF waveform
y = wlanVHTSTF(cfg)
Create a VHT configuration object with an 80 MHz channel bandwidth. Generate and plot the VHT-STF waveform.
cfgVHT = wlanVHTConfig; cfgVHT.ChannelBandwidth = 'CBW80'; vstfOut = wlanVHTSTF(cfgVHT); size(vstfOut); plot(abs(vstfOut)) xlabel('Samples') ylabel('Amplitude')
The 80 MHz waveform is a single OFDM symbol with 320 complex time-domain output samples. The waveform contains the repeating short training field pattern.
y— VHT-STF time-domain waveform
VHT-STF time-domain waveform, returned as an NS-by-NT matrix. NS is the number of time-domain samples, and NT is the number of transmit antennas.
NS is proportional to the channel bandwidth.
See VHT-STF Processing for waveform generation details.
Complex Number Support: Yes
The very high throughput short training field (VHT-STF) is a single OFDM symbol (4 μs in length) that is used to improve automatic gain control estimation in a MIMO transmission. It is located between the VHT-SIG-A and VHT-LTF portions of the VHT packet.
The frequency domain sequence used to construct the VHT-STF for a 20 MHz transmission is identical to the L-STF sequence. Duplicate L-STF sequences are frequency shifted and phase rotated to support VHT transmissions for the 40 MHz, 80 MHz, and 160 MHz channel bandwidths. As such, the L-STF and HT-STF are subsets of the VHT-STF.
The VHT-STF is defined in IEEE® Std 802.11ac™-2013, Section 18.104.22.168.4.
 IEEE Std 802.11ac™-2013 IEEE Standard for Information technology — Telecommunications and information exchange between systems — Local and metropolitan area networks — Specific requirements — Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications — Amendment 4: Enhancements for Very High Throughput for Operation in Bands below 6 GHz.
 IEEE Std 802.11ac-2013 Adapted and reprinted with permission from IEEE. Copyright IEEE 2013. All rights reserved.