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Re: [Discuss-gnuradio] How to receive existing AP's signal using gr-ieee

From: Bastian Bloessl
Subject: Re: [Discuss-gnuradio] How to receive existing AP's signal using gr-ieee802-11?
Date: Sun, 13 Dec 2015 21:40:49 -0800


> On 13 Dec 2015, at 16:36, Ke Xu <address@hidden> wrote:
> I have tried what you have said. I use a wireless router as the AP, as it
> does not support 11a, I cannot use the 5G band, but it support '11g-only',
> so i set it to this mode. And in my testbed, there are many other APs, i
> have no idea which mode they operate on. I also annotate the checksum
> operation in 'OFDM Ddcode MAC' block because if don't, I will get nothing
> output in my terminal. I set the sample rate of my USRP N210 to 20M. 
> Sometimes I can get some meaningful string output but it is not sent by my
> AP. I also get some beacon frames rarely, however its decoded SSID is messy
> code. What confused me is that I can see a lot of decoded mac address which
> belong to other APs in my testbed and none for my own AP.

I’m not sure what you mean with ‘annotate the checksum’, but if you disabled 
the CRC check it’s no wonder when you see corrupt frames.

Instead of disabling the CRC,  you should try to find out what goes wrong. 
Maybe you want to try the other things from the last email.


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