I solved this problem by using WBX daughterboard instead of SBX. Now, the
USRP2 can decode some packets transmitted by the APs. I have posted the
result in last email.
I think the problem is caused by low SNR.
However, I still have a few questions:
1. I think the what I got is 802.11b beacon frame, because the SSID is
corresponding to my AP. Is it right?
2. The daughterboard information is :
WBX 50-2200 MHz Rx/Tx
<https://www.ettus.com/product/details/WBX>
SBX 400-4400 MHz Rx/Tx <https://www.ettus.com/product/details/SBX> It's
weird that I can catch the packet on 2.412G Hz by WBX rather than SBX. The
highest frequency bound of WBX is just 2.2G.
3. What's the unit of the RSSI in bbn_80211b_rx.py? The RSSI I got is -96,
if it means -96dbm, that would be too weak for a 802.11b signal.
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