Thanks Veljko Actually, the problems I had were not with the OFDM case, but just benchmark_tx.py and benchmark_rx.py. Are similar modifications necessary for those scripts?
Ian. >Hi, >The example provided with the gnuradio codebase requires small >modifications in order to work with USRP2. You can try with the >modifications I made: >www.cs.ucsb.edu/~veljko/downloads/ofdm_example.tar.gz >In my case with XCVR2450 daughter boards running the following works fine: >transmitter: >benchmark_ofdm_tx_new.py -f 2.45G --tx-amplitude 0.9 -M 8 -s 200 -m >bpsk --fft-length=512 --occupied-tones=80 -i 64 --tx-gain=10 >--cp-length=128 >receiver: >benchmark_ofdm_rx_new.py -e eth1 -f 2.45G -m bpsk --fft-length=512 >--occupied-tones=80 -d 64 --rx-gain=30 --cp-length=128 >You can try with the transmitter only first and usrp2_fft.py on the >other end, just to see if there's something getting transmitted and if >it looks like OFDM. >cheers, >veljko 2010/2/2 Ian Holland <ian.holl...@rlmgroup.com.au>: > Hi Anupama > > Unfortunately, I can't offer a solution at this stage. However, I had > similar error messages a few days ago. I thought perhaps these python > scripts were to be used exclusively for the original USRPs, though I > think in one or two posts I have seen, people mentioned successfully > running them for USRP2s. > > Ian. > > > > -----Original Message----- > From: discuss-gnuradio-bounces+ian.holland=rlmgroup.com...@gnu.org > [mailto:discuss-gnuradio-bounces+ian.holland=rlmgroup.com...@gnu.org] On > Behalf Of Anu000 > Sent: Wednesday, 3 February 2010 8:04 AM > To: Discuss-gnuradio@gnu.org > Subject: Re: [Discuss-gnuradio] running OFDM on USRP2 > > > Hi, > We did try the below command on two USRP2s coneected via a SMA Cable > (Tx-Rx) > with freq = 25M however it returned the following error on both sides > > At Rx side it shows like the below - > > [r...@gnuradio1 ofdm]# ./benchmark_ofdm_rx.py -f 25M -d 256 > --fft-length=64 > --occupied-tones=32 --cp-length=4 > usrp: failed to find usrp[0] > Traceback (most recent call last): > File "./benchmark_ofdm_rx.py", line 210, in <module> > main() > File "./benchmark_ofdm_rx.py", line 199, in main > tb = my_top_block(rx_callback, options) > File "./benchmark_ofdm_rx.py", line 51, in __init__ > self._setup_usrp_source() > File "./benchmark_ofdm_rx.py", line 70, in _setup_usrp_source > fusb_nblocks=self._fusb_nblocks) > File "/usr/lib/python2.6/site-packages/gnuradio/usrp/usrp_swig.py", > line > 1699, in source_c > return _usrp_swig.source_c(*args, **kwargs) > RuntimeError: can't open usrp > > At Tx side - > r...@gnu2 ofdm]# ./benchmark_ofdm_tx.py -f 25M -i 512 --fft-length=64 > --occupied-tones=32 --cp-length=4 > usrp: failed to find usrp[0] > Traceback (most recent call last): > File "./benchmark_ofdm_tx.py", line 217, in <module> > main() > File "./benchmark_ofdm_tx.py", line 190, in main > tb = my_top_block(options) > File "./benchmark_ofdm_tx.py", line 51, in __init__ > self._setup_usrp_sink() > File "./benchmark_ofdm_tx.py", line 66, in _setup_usrp_sink > fusb_nblocks=self._fusb_nblocks) > File > "/usr/local/lib/python2.5/site-packages/gnuradio/usrp/usrp_swig.py", > line 2415, in sink_c > return _usrp_swig.sink_c(*args, **kwargs) > RuntimeError: can't open usrp > > May we request somebody to support us at the earliest to resolve the > above > issue with either software or hardware . > > Thanks again, > Anupama > > > > bin zan 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 >> >> _______________________________________________ >> Discuss-gnuradio mailing list >> Discuss-gnuradio@gnu.org >> http://lists.gnu.org/mailman/listinfo/discuss-gnuradio >> >> > > -- > View this message in context: > http://old.nabble.com/running-OFDM-on-USRP2-tp27342376p27427749.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 > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio > _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio