Hi,

I found the appended THread in the archive.
That time, there was no answer to this mail.
But I have exactly the same problem to understand the architecture of the packets.
It would be nice, if anyone could write a short explanation why the \x55 
and the preamble are added to the packet.
Thanks a lot.

Regards,
Tobias


Hi all,
I was going through the pkt.py and packet_utils.py just to try and understand how packets are generated. Is it right to say that preamble has not being added to the payload? "(packed_preamble, _*ignore*_) = conv_1_0_string_to_packed_binary_string(preamble)"
If it is being added how is it helpful on the receiver side because i 
don't see where it has been used or extracted. I know that it can be 
used to contain the training sequence for channel estimation but i doubt 
it has been used for the same here.  I can only see the access code 
correlator to mark the beginning of payload and no correlator for the 
preamble. Is it right to assume that the access code correlator alone 
can be suffice?  What is the significance of _*'\x55'*_ at the end of 
the packet before introducing usrp pad? I am asking because according to 
my understanding it should make the end of payload(post amble) but I 
don't see a correlator for it.
Kind regards,
Nelson
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