[Discuss-gnuradio] How to set the timestamp for synchronize transmitting with multiple USRP2.

[hanwen]

Hi Talents,

 

We are trying to synchronize multiple USRP2s for MIMO transmision. Common 10MHz clock and 1PPS are used, as well as sync_to_pps() and config_mimo(usrp2.MC_WE_LOCK_TO_SMA).

We tried to set the metadata of packets in order to specify a starting point of transmssion.

 

usrp2::tx_metadata    md;
md.timestamp = 99999999;
md.start_of_burst = 1;
md.send_now = 0;

 

But it just doesn't work? If it is possible to synchronize the transmission, could you tell us how?

 

 

Bests,

Hanwen