I called sync_every_pps(), and set the timestamp of every frame to 999999999. Now I can align the transmitted samples when interporlation rate higher than 10 but not for above. I guess this it is because the datarate is too high which the buffer on USRP2 can not accommordate. Am I right? What's the size of the buffer for samples from host?
Hanwen 2009/9/23 Doug Geiger <[email protected]> > hanwen wrote: > > Hi, > > > > We've achieved synchronized receving with two USRP2s with independent > > ethernet port. I'll report in another thread. Here we are beginning to > > build a MIMO transmitter. The question comes again regarding how to get > > the samples to two USRP2 aligned. I tried to set the timestamp of > > metadata in tx_sample.cc in order to schedule the transmit occasion. But > > it seems doesn't work. Still we are using external common 10MHz ref and > > 1PPS. > > > > Thanks in advance. > > > > Bests, > > Hanwen > > Are you calling sync_to_pps() for both USRP2's before transmitting to > ensure the internal clocks are aligned? > Doug > > -- > Doug Geiger > [email protected] > [email protected] >
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