On Thu, Dec 05, 2013 at 06:47:16PM +0800, Damon wrote: > When I was running benchmark example in gr-digital/examples/narrowband, > all packets may lose. The environment is shown below. > Hardware: USRP N210 with WBX > Software: GNU Radio v3.7.2.1-62-g6195ff3c and UHD_003.006.000-0-g58f4af97 > > The two USRPs are placed close to each other. The example is run by: > On the TX side: python benchmark_tx.py -f 1.55G -m qpsk -r 200k -M 10 > On the RX side: python benchmark_rx.py -f 1.55G -m qpsk -r 200k > > Sometimes, all packets could be received. Then I restarted test, nothing > was printed in the terminator on the RX side. > It looks like a random event. I guess there is something wrong with > timing synchronizer in the receive path. > By the way, everything is ok when we do the test with gmsk.
This can happen, it takes a bit of practice to transmit and receive a clean signal. There lots of reasons this can go wrong: Interference, non-linear distortions (wrong gain settings)... GMSK is a bit more robust in these regards. Nothing to worry about! MB -- Karlsruhe Institute of Technology (KIT) Communications Engineering Lab (CEL) Dipl.-Ing. Martin Braun Research Associate Kaiserstraße 12 Building 05.01 76131 Karlsruhe Phone: +49 721 608-43790 Fax: +49 721 608-46071 www.cel.kit.edu KIT -- University of the State of Baden-Württemberg and National Laboratory of the Helmholtz Association
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