Hi all,
I have a question on my python file.
The original source code is here: https://www.cgran.org/browser/projects/ftw_80211_ofdm_tx/trunk/src/examples
I modified the ftw_ofdm_tx.py a little.
I want to do like this:
I have a series: 1,-1,1,-1,-1,-1.....
I read the series one by one by a certain time, e.g., I read "1" at the time point 0, "-1" at the time point 5, the next "1" at the point 10.....
if I read "1", I send the msg to a certain frequency (e.g., 802.11g, 2.427G) for a specific time (1 second). Otherwise I do nothing. I use a while loop to control the time interval.
I run: python /home/w500/Desktop/ftw_80211_ofdm_tx/trunk/src/examples/ftw_ofdm_tx_back.py -f 2.427G -n 3 -g 30
But it doesn't work like what I want.
So, could you please help me to figure it out? I will be appreciated very much.
Thank you!
John
Below is the modified file:(ftw_ofdm_tx.py), I use bold font to label the modified part.
#!/usr/bin/env python
#
# Copyright 2005, 2006 Free Software Foundation, Inc.
#
# This file is part of GNU Radio
#
# GNU Radio is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3, or (at your option)
# any later version.
#
# GNU Radio is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with GNU Radio; see the file COPYING. If not, write to
# the Free Software Foundation, Inc., 51 Franklin Street,
# Boston, MA 02110-1301, USA.
# Projectname: ftw_80211_ofdm_tx
#
# Filename: ftw_ofdm_tx.py
#
# This is the main script that triggers the encoding procedures and
# sends the complex baseband signal to the USRP2 sink.
#
# List of Contributors: Andrea Costantini,
# Paul Fuxjaeger, (fuxjaeger@ftw.at)
# Danilo Valerio, (valerio@ftw.at)
# Paolo Castiglione, (castiglione@ftw.at)
# Giammarco Zacheo, (zacheo@ftw.at)
# Forschungszentrum Telekommunikation Wien
# Telecommunications Research Center Vienna
# (http://www.ftw.at)
# December 2009
import time, struct, sys, sched
from gnuradio import gr, blks2, usrp2, eng_notation
from gnuradio.eng_option import eng_option
from optparse import OptionParser
from ftw_ofdm import ftw_transmit_path
class my_top_block(gr.top_block):
def __init__(self, options, payload=''):
gr.top_block.__init__(self)
self._interface = options.interface # logical network interface
self._mac_addr = options.mac_addr # MAC address
self._tx_freq = options.freq # center frequency
self._interp = options.interp # interpolation factor
self._gain = options.gain # Tx gain
# setup sink and connect output of transmitpath to it
self._setup_usrp_sink()
self.txpath = ftw_transmit_path(options, payload)
self.connect(self.txpath, self.u)
# write final baseband signal to disk
if options.log:
self.connect(self.txpath, gr.file_sink(gr.sizeof_gr_complex, "final.dat"))
def _setup_usrp_sink(self):
"""
Creates a USRP sink, determines the settings for best bitrate,
and attaches to the transmitter's subdevice.
"""
self.u = usrp2.sink_32fc(self._interface, self._mac_addr)
self.u.set_interp(self._interp)
self.u.set_gain(self._gain)
self.set_freq(self._tx_freq)
def set_freq(self, target_freq):
"""
Set the center frequency we're interested in.
@param target_freq: frequency in Hz
@rtype: bool
Tuning is a two step process. First we ask the front-end to
tune as close to the desired frequency as it can. Then we use
the result of that operation and our target_frequency to
determine the value for the digital up converter.
"""
tr = self.u.set_center_freq(target_freq)
if tr == None:
sys.stderr.write('Failed to set center frequency\n')
raise SystemExit, 1
# /////////////////////////////////////////////////////////////////////////////
# main
# /////////////////////////////////////////////////////////////////////////////
def main():
def send_pkt(payload='', eof=False, delay=5):
print "enter"
curtime=time.time()
print time.time()
print delay
print payload
while time.time()-curtime < delay-0.05:
#tb.start()
print time.time()
print "coming"
print eof
tb.txpath.send_pkt(payload, eof)
tb.txpath.send_pkt(eof=True)
#tb.wait()
print "ccccc"
#tb.txpath.send_pkt(eof=True)
print "exit" #return tb.txpath.send_pkt(payload, True)
s = sched.scheduler(time.time, time.sleep) parser = OptionParser(option_class=eng_option, conflict_handler="resolve")
parser.add_option("-e", "--interface", type="string", default="eth0",
help="set ethernet interface, [default=%default]")
parser.add_option("-m", "--mac-addr", type="string", default="",
help="set USRP2 MAC address, [default=auto-select]")
parser.add_option("-f", "--freq", type="eng_float",
default = 2.412e9, help="set USRP2 carrier frequency, [default=%default]",
metavar="FREQ")
parser.add_option("-i", "--interp", type="intx", default=5,
help="set USRP2 interpolation factor, [default=%default]\
5 -> 802.11a/g, OFDM-symbolduration=4us, \
10 -> 802.11p, OFDM-symbolduration=8us")
parser.add_option("-g", "--gain", type="int", default=10 , help = "set USRP2 Tx GAIN in [dB] [default=%default]")
parser.add_option("", "--regime", type="string", default="1",
help="set OFDM coderegime: [default=%default]\
1 -> 6 (3) Mbit/s (BPSK r=0.5), \
2 -> 9 (4.5) Mbit/s (BPSK r=0.75), \
3 -> 12 (6) Mbit/s (QPSK r=0.5), \
4 -> 18 (9) Mbit/s (QPSK r=0.75), \
5 -> 24 (12) Mbit/s (QAM16 r=0.5), \
6 -> 36 (18) Mbit/s (QAM16 r=0.75), \
7 -> 48 (24) Mbit/s (QAM64 r=0.66), \
8 -> 54 (27) Mbit/s (QAM64 r=0.75)")
parser.add_option("-n", "--norm", type="eng_float", default=0.3 , help="set gain factor for complex baseband floats [default=%default]")
parser.add_option("-s","--swapIQ", action="store_true", default=False, help="swap IQ components before sending to USRP2 sink [default=%default]")
parser.add_option("-r", "--repetition", type="int", default=1 , help="set number of frame-copies to send, 0=infinite [default=%default] ")
parser.add_option("-l", "--log", action="store_true", default=False, help="write debug-output of individual blocks to disk")
parser.add_option("-p", "--payload", type="string", default="HelloWorld",
help="payload ASCII-string to send, [default=%default]")
(options, args) = parser.parse_args ()
# This is the ASCII encoded message that will be put into the MSDU (you have to build IP headers on your own if you need them!)
# Use monitor (promiscuous) mode on the receiver side to see this kind of non-IP frame.
#my_msg = options.payload
my_msg = 'A'; # build the graph
tb = my_top_block(options, my_msg)
r = gr.enable_realtime_scheduling()
if r != gr.RT_OK:
print "Warning: failed to enable realtime scheduling"
# tb.start()
## # start flow graph
## tb.start()
## # send frame
## send_pkt(my_msg , eof = False)
## send_pkt(eof = True)
## # wait for it to finish
## tb.wait()
s.enter(0,1,tb.wait,())
i=0
for item in [1,-1,1,1,-1,1,-1]:
i=i+1
if item == 1:
s.enter((i-1)*5, i, send_pkt, [my_msg, False, 5])
else:
s.enter((i-1)*5, i, time.sleep, [5])
s.enter(35,8,tb.wait,())
s.run()
# tb.wait() if __name__ == '__main__':
try:
main()
except KeyboardInterrupt:
pass
