Dear All, I am trying to demod a qpsk from another USRP but with the setup below I get a really noisy constellation:
http://img231.imageshack.us/img231/2465/screenshotysh.png The 2 USRPs are connected via a SMA cable with 40 db attenuators and DC blocker. I have also played with the costas alpha, samples per symbol, gain mu, frequency fine tunning and this is the best result I can get. ./benchmark_tx.py -m dqpsk -f 1.25G -m dqpsk --tx-amplitude=10000 -r 1M -M 99999999 --excess-bw=0.35 ./benchmark_rx.py -r 1M -m dqpsk --log --costas-alpha=0.05 -S 4 --verbose -r 1M --gain-mu=0.01 --excess-bw=0.35 -f 1.25G Thanks for your help. -- View this message in context: http://www.nabble.com/QPSK-phase-noise-tp22934944p22934944.html Sent from the GnuRadio mailing list archive at Nabble.com. _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
