Hi,
> On 28 Feb 2016, at 16:03, Stephen Berger
> <stephen.berger.temconsult...@gmail.com
> <mailto:stephen.berger.temconsult...@gmail.com>> wrote:
>
> Let me offer a non-GNURadio solution. This can probably be replicated in
> GNURadio but I haven’t done it and so would need to look into how feasible it
> is to implement. You can use Wireshark and any WiFi NIC to capture packets.
> If you can put the NIC is promiscuous mode you can sequentially tune it to
> each channel and record any packets that occur. I was dwelling on each
> channel for 3 seconds and scanning all the 2.4 and 5 GHz channels.
>
> In each captured packet is the channel number being used and the RSSI of the
> signal at each device. For some purposes this RSSI is useful. If you can
> further measure the RSSI at your USRP you have 2 measures of the signal and
> that could potentially be very useful.
>
> I also looked at things like the number of access points and attached
> devices. This is useful because you can start to compare environments based
> on the network configuration of the access points and the number of people
> using their devices in the area.
>
> What this method does not tell you is what is out there that is not WiFi. In
> some recent measurements I am seeing an increasing number of Bluetooth and
> Bluetooth Low Energy. Not a surprise.
Sounds good. Since you use WiFi cards I wanted to mention, that some of them
support /spectral scans/ [1], which report about the power level at different
frequencies.
These measurements are independent from received frames and allow to build a
very simple spectrum analyser, i.e., interferers like Bluetooth can also be
detected.
Best,
Bastian
[1] http://blog.altermundi.net/article/playing-with-ath9k-spectral-scan/
<http://blog.altermundi.net/article/playing-with-ath9k-spectral-scan/>
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