This experiment illustrates the physical layer parameters of IEEE 802.11ac Wi-Fi (WLAN).
Wi-Fi transmission block diagram
This setting of IEEE 802.11ac is used:
- 80 MHz
-
= 1 (Number of spatial streams)
- VHT-MCS 6 (Very high throughput - modulation and coding scheme)
- 400 ns guard interval
VHT-
MCS
Index |
Modulation |
Coding
rate
R |
Number
of
coded
bits per
single
carrier
|
IFFT/FFT length
|
Number of
data
subcarriers
|
Number of
pilot
subcarriers
|
Number of
DC
subcarriers
|
Discrete
length
of the
guard interval
|
Data
rate
Mb/s |
| 6 |
64-QAM |
3/4 |
6 |
256 |
234 |
8 |
3 |
32 |
292,5 |
Physical layer parameters IEEE 802.11ac: 80 MHz,
= 1, VHT-MCS 6
The following parameters can be derived:
| Uncoded data rate |
390 Mb/s |
| Source symbol duration
|
15,385 ns |
| Transmission symbol duration
|
12,5 ns |
| Total OFDM symbol duration
|
3,60 µs |
| Guard time
|
0,4 µs |
| Subcarrier spacing
|
0,3125 MHz |
Nyquist bandwidth
(including pilot and DC subcarriers) |
76,5625 MHz |
Physical layer parameters IEEE 802.11ac: 80 MHz,
= 1, VHT-MCS 6
The transmit spectrum can be measured in the simulation.
IEEE 802.11ac transmit spectrum. The minimum required bandwidth (Nyquist) is 76,5625 MHz (= 2* 38,28125 MHz).
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