Changes between Version 7 and Version 8 of 802.11/wlan_exp/app_notes/tutorial_hop_mac/slow_hopping

Timestamp:

Aug 4, 2015, 3:16:16 PM (9 years ago)

Author:

chunter

Comment:

--

802.11/wlan_exp/app_notes/tutorial_hop_mac/slow_hopping

@@ -116 +116 @@
 ||  '''Slow Frequency Hopping 802.11'''  ||
 
-The above spectrograms compare the behavior of the 802.11 design when {{{HOP_MODE = 0}}} to the 802.11 design when {{{HOP_MODE = 1}}}. We can see that each hop occurs roughly every 10 seconds. This is due to the definition of {{{HOP_INTERVAL_NUM_TBTT}}} being {{{100}}} beacon intervals (where each beacon interval is 102.4 ms).
+The above spectrograms compare the behavior of the 802.11 design when {{{HOP_MODE = 0}}} to the 802.11 design when {{{HOP_MODE = 1}}}. With frequency hopping disabled, the design sits on channel 1 on the far left of the spectrogram. When frequncy hopping is enabled, we can see that each hop occurs roughly every 10 seconds. This is due to the definition of {{{HOP_INTERVAL_NUM_TBTT}}} being {{{100}}} beacon intervals (where each beacon interval is 102.4 ms).
 
 The UDP stream continues across frequency hops without interruption because the Wi-Fi client knows and honors the Channel Switch Announcement. Because of the lossy nature of multicast beacons, we are not able to dramatically speed up the hopping rate with this architecture and still expect the STA to reliably track the frequency hopping changes of the AP.