Well, I did it like that, it did not work with connecting the file_source
direct to USRP.
I thought then it might work when I do the 'vector thing' in the middle.
In either case, the receiver USRP does not detect anything.
----- Original Message ----
From: Tom Rondeau <[EMAIL PROTECTED]>
To: Hoo-chang Shin <[EMAIL PROTECTED]>
Cc: Discuss-gnuradio@gnu.org
Sent: Thursday, April 17, 2008 1:48:27 PM
Subject: Re: [Discuss-gnuradio] Sending pre-saved OFDM file to USRP
Hoo-chang Shin wrote:
> Hi,
>
> I'm trying to send a pre-saved OFDM file to a transmitter USRP, and to
> receive the signal from a receiver USRP.
> >From the 'benchmark_ofdm_tx.py' I've saved the OFDM signal to a file using
> >'gr.file_sink', instead of sending it to 'usrp.sink_c'.
> And then I want to read the data from the saved file and send it though the
> transmitter USRP, and receive it from the other USRP, but does not work.
>
> Could anyone give tip, why it does not work? Or give help how to make it work?
>
>
> This is my code:
>
> #!/usr/bin/env python
>
> from gnuradio import gr
> from gnuradio import usrp
>
> from numpy import *
>
> class send_from_file_graph (gr.flow_graph):
>
> def __init__(self):
> gr.flow_graph.__init__(self)
>
> filename = 'tx_usrp_data.dat'
> # which I had saved from 'benchmark_ofdm_tx.py' using
> 'gr.file_sink(gr.sizeof_gr_complex, filename)'
> src = gr.file_source ( gr.sizeof_gr_complex, filename, False)
>
> self.v_snk = gr.vector_sink_c()
>
> # setup usrp
> self.u = usrp.sink_c(fusb_block_size=0, fusb_nblocks=0)
> self.u.set_interp_rate(512)
> self._tx_subdev_spec = usrp.pick_tx_subdevice(self.u)
> self.subdev = usrp.selected_subdev(self.u, self._tx_subdev_spec)
>
> self.u.tune(self.subdev._which, self.subdev, 2.45e9)
> self.subdev.set_gain(200)
> self.subdev.set_auto_tr(True)
> # ##
>
> self.connect(src, self.v_snk)
> self.run()
> v_src = gr.vector_source_c(self.v_snk.data())
> self.connect(v_src, self.u)
> self.run()
Why don't you just do:
self.connect(src, self.u)
Instead of all the vector stuff in the middle?
Tom
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