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Re: [Discuss-gnuradio] Sending pre-saved OFDM file to USRP

From: Tom Rondeau
Subject: Re: [Discuss-gnuradio] Sending pre-saved OFDM file to USRP
Date: Thu, 17 Apr 2008 12:48:27 +0100
User-agent: Thunderbird (Windows/20080213)

Hoo-chang Shin wrote:

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):
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._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.connect(src, self.v_snk)
    v_src = gr.vector_source_c(self.v_snk.data())
    self.connect(v_src, self.u)

Why don't you just do:

self.connect(src, self.u)

Instead of all the vector stuff in the middle?


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