How to set the timestamp for synchronize transmitting with multiple USRP2

GNU Radio
1

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

2

Hi,

We integrate the two programs for two usrp2 seperately into one program
(configure and stream the usrp2 in one program), the problem was solved.

Cheers,
Hanwen

2009/10/30 hanwen [email protected]