Re: [Discuss-gnuradio] Getting to know about USRP FPGA programming

[Naceur]

Hi Marcus, 

Thank you for your reply, 
What I am aiming ultimately is to estimate the time delay a packet could
have when running through the following path:

HOST(1) =>[Ethernet]=> USRP(1)[FPGA-DAC-AnalogPath-Antenna] ==> On the air 
==> The same path Reversed (USRP(2)) ==> HOST(1) or another HOST,

The problem here is that the time delay of propagation on the air is so
insignificant compared to the time delay of Hardware propagation then
especially through the Ethernet from the Host(1) or to the Host(2),

NEXT, that let's say software delay (From the moment the packet is passed
from a modulator block in a gnu radio top block to the USRP Sink to the
moment it is transformed and inserted into the stream to the FPGA) is
VARIABLE, That's why I asked if it is better to migrate to use FPGA time
domain, by inserting time register's value into the appropriate field in the
packet stream,

Am I pursuing a good path or non realistic and infeasible.
Best Regards,   



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