On Wed, Jan 27, 2010 at 11:21 AM, bin zan <zanbin2...@gmail.com> wrote: > Hello, > I was trying to run following OFDM command on USRP2, however, I got a > bunch of "SSSSStime out" at the receiver side. > > ./benchmark_ofdm_tx.py -f 2.4G -i 512 --fft-length=64 --occupied-tones=32 > --cp-length=4 > ./benchmark_ofdm_rx.py -f 2.4G -d 256 --fft-length=64 --occupied-tones=32 > --cp-length=4 > > I wonder if there is any one successfully running OFDM on USRP2, what are > the command parameters you are using and if there is any modification in the > code, can you let me know. > > Thanks, > Bin
The 'S' appear because you're missing packets. Using the interpolation and decimation rates you specified shouldn't be taxi/ng your CPU, which is a common cause of these problems. Are you running the USRP2 through a switch or is it directly connected? The "time out" occurs when the receiver sees the preamble symbol of the OFDM stream but nothing else. So what is probably happening is that you get some of the symbols through, including the preamble symbol, but you're dropping other packets (causing the Ses), which will trigger the "time out" message. Tom _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
