[Discuss-gnuradio] How to count number of samples in a packet?

[Khajavi, Dara]

Hello gnuradio users,

I am new to gnuradio and don't know much about it. I  would like to make a burst transmission system based on OFDM. Regarding the previously discussed emails, I learned that the first and the last samples in a burst should be tagged with "tx_sob" and "tx_eob" , but I don't know how to count the number of samples I have in one packet. Could anyone kindly help me with that? I actually want to send one packet per each burst. The FFT size is 64 and sampling rate is 1MSps. Payload is qpsk modulated and packet header is bpsk modulated

I am using the already exist tx_ofdm.grc file but I added the 2 Tag Strobes and one Delay block to see if the tags are recognized by the USRP X300.

Thanks a lot in advance

Dara