Re: [Discuss-gnuradio] BBN 802.11 bbn_80211b_rx.py

[yyzhuang]

I'm not sure of the frequency so I tried 

./bbn_80211b_rx.py -f 2.462G -d 8 -b -v
Bits Per Encoded Sample = 8
adc frequency =  64000000
decimation frequency =  8
input_rate =  8000000
gain =  45.0
desired freq =  2462000000.0
baseband frequency 2460000000.0
dxc frequency -2000000.0
Samples per data bit =  8
>>> gr_fir_ccf: using SSE
PKT: len=77, rssi=-22, src=00:13:46:16:28:AA, time=557560, rate=1 Mbps
PKT: len=77, rssi=-29, src=00:13:46:16:28:AA, time=1786312, rate=1 Mbps
PKT: len=77, rssi=-26, src=00:13:46:16:28:AA, time=1991192, rate=1 Mbps
PKT: len=77, rssi=-27, src=00:13:46:16:28:AA, time=2195928, rate=1 Mbps
PKT: len=77, rssi=-19, src=00:13:46:16:28:AA, time=2912744, rate=1 Mbps
PKT: len=77, rssi=-28, src=00:13:46:16:28:AA, time=3527168, rate=1 Mbps
PKT: len=77, rssi=-25, src=00:13:46:16:28:AA, time=3936776, rate=1 Mbps
PKT: len=77, rssi=-26, src=00:13:46:16:28:AA, time=4141640, rate=1 Mbps
PKT: len=77, rssi=-24, src=00:13:46:16:28:AA, time=4858456, rate=1 Mbps
PKT: len=77, rssi=-26, src=00:13:46:16:28:AA, time=5063192, rate=1 Mbps
PKT: len=77, rssi=-21, src=00:13:46:16:28:AA, time=5268192, rate=1 Mbps 

This time packets are received. It seems to me that (desired freq) + (dxc
frequency) = (baseband frequency)

BTW, I'm in Ubuntu 8.04


Greg Troxel wrote:
> 
>   BTW, what does that guy mean "Not sure when you updated, but we have
> changed
>   the checked in code to default to 2437, and run it like this (as a
> NetBSD
>   rc.d start script)", following the above link?
> 
> details if you care, but surely they have little to do with your issues.
> 
>   http://www.netbsd.org/docs/guide/en/chap-rc.html
> 
> about your output:
> 
>   ./bbn_80211b_rx.py -f 2.437G -v -b
>   Bits Per Encoded Sample = 8
>   adc frequency =  64000000
>   decimation frequency =  16
>   input_rate =  4000000
>   gain =  45.0
>   desired freq =  2437000000.0
>   baseband frequency 2432000000.0
>   dxc frequency -5000000.0
>   Samples per data bit =  8
>   >>> gr_fir_ccf: using SSE
> 
>   2.432G is used instead of 2.437G.  Also the dxc frequency is negative. 
> And
>   no packets get printed out. 
> 
> I am unclear on dxc.
> 
> Are you sure there are strong signals at the 1 Mb/s rate on 2437 MHz?
> 
>   /adroitgrdevel/gr-bbn/src/examples/bbn_80211b_rx.py just like this:
> 
> What operating system are you running on?  That script may be expecting
> the NetBSD tap device, and your system's might be different.
> 
> 
> 
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> 
> 

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