Second Video - 802.11ac vs 802.11ax

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The second video in the series of the 802.11ax training videos. In this video I highlight most of the important differences between 802.11ac and 802.11ax.
  1. Firas Shaari
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Couple corrections and notes
2:30 You create a GI by copying the first part of OFDM symbol and attaching that to the symbol’s tail.
3:33 OFDM, not OFDMA.
5:00 802.11ac SGI percentage 0.4/3.2 *100=12.5%. 802.11ax SGI percentage 0.8/12.8*100=6.25%.
6:00 UL MU-MIMO direction is from the clients and to the clients.
11:05 Fragment a frame not a load.
12:45 By setting higher values for CWmin and CWmax for 802.11ax clients than 802.11ac. The AP guarantees that 802.11ax will have a chance to compete for the channel with legacy clients and will only rely on UL OFDMA scheduled by the AP for UL transmission.
13:32 AP and clients can both have 2 NAVs
15:18 U-APSD which stands for Unscheduled Automatic Power Save Delivery

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