Hi all,
In the attached picture a flow graph is shown where i use the "random"
pdu generator for a fixed sized pdu (1200 bytes here). The
pdu_to_tagged_stream block makes it accessible for a simple BPSK
modulation to send it over a coax cable to another USRP B200. A time
sink shows what the transmitter transmits and what the receiver should
receive ideally.
By inserting some different delays, e.g. a uniformly distributed (0 to
80 ms in the disabled block here), i want to emulate a communication
system. My questions are:
1. How can a realize a burst transition that transmit the fixed sized
burst, i.d. the pdu, in a 20 ms slot whereas the last 60ms no
transition occurs before a new pdu is generated by the message_strobe
block? By now it is a continuous transition no matter what i change.
2. I want to store the time from generating the pdu till my second
USRP receives it. Tagging the time should be an option to realize
that. Since a have no clue: How can i realize that using time tags?
The simplest case is - without any delays - that the pdu is generated
and transmitted in a 20ms slot plus the processing time which should
be small compared to the 20 ms.
I am thankful for any kind of help. Thanks and have a nice weekend,
Henning
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