On Thursday 09 October 2008 19:47:10 Bill Stevenson wrote: > Hello, everyone! > > I am just running a demo program to realize communication between two usrps > using benchmark_rx and benchmark_py under the Python/digital dir. But when > I am trying to use dqpsk modulation scheme, the packets received are > totally wrong. What's wrong with the programs? I am really confused. Could > anybody give me a hint or help me out? Thank you!!! > > Bill
I had a problem with different oscillator frequencies on two boards, not much but enough for the digital pll in the receiving gnuradio block to lose tracking. As a workaround, I used the usrp_fft.py programm as a receiver, and on the sending side just a carrier. This way, I could determine the frequency offset between the two boards. Stefan -- Stefan Brüns / Bergstraße 21 / 52062 Aachen mailto:lurch at gmx.li http://www.kawo1.rwth-aachen.de/~lurchi/ phone: +49 241 53809034 mobile: +49 151 50412019 _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
