[Discuss-gnuradio] Transmit time synchronization

[Muhammad Shahmeer Omar]

Hello all,

I am trying to implement a multi-relay cooperative network using gnuradio and USRP B200. I cannot figure out how to synchronize the relay transmissions using GNU-Radio (without editing FPGA code or using external clock source).

I created an out of tree module derived from the tags_demo example of uhd but i encounter a problem with the packet encoder.

my flow graph is something like

USRP source ---> tagging_block ---> DBPSK demod -->packet decoder --> encoder --> mod --> USRP sink.