RE: [Discuss-gnuradio] running OFDM on USRP2

[Ian Holland]

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: address@hidden
[mailto:address@hidden On
Behalf Of Anu000
Sent: Wednesday, 3 February 2010 8:04 AM
To: address@hidden
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 -

address@hidden 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 -
address@hidden 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
> address@hidden
> http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
> 
> 

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