[Discuss-gnuradio] 802.11 USRP2

[holmes]

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, (address@hidden) 
#                       Danilo Valerio, (address@hidden)
#                       Paolo Castiglione, (address@hidden)
#                       Giammarco Zacheo, (address@hidden)


# 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="", 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="", 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

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ftw_ofdm_tx_back.py
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