Re: [Discuss-gnuradio] bbn_80211b_rx.py: how is the received packet handled please?

[yyzhuang]

Thanks. I think it should be something from the 802.11 frame over the
wireless link.

Since I see the time and other stuff are got from the packet, could
you tell me how is the packet received from usrp (by sampling in the
usrp?), what is its format? and for how we can actually do with it, is
unpack the packet according to its format enough?

Thanks again


Daniel Sumorok wrote:
> 
> At 04:33 PM 7/29/2008, yyzhuang wrote:
> 
>>And what exactly the "time" is? As I see in the script, is it in ticks?
>>means the time instance, or the inter-arrival time?
> 
> "time" is a packet arrival timestamp, in microseconds, relative to the
> time 
> the receiver is started.  It is calculated by counting received samples so 
> it based off a clock in the USRP, not a clock in the PC.  By comparing the 
> timestamps of two received packets you should be able to determine 
> difference in actual arrival times to with a couple microseconds.
> 
>   -Dan 
> 
> 
> 
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