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# Copyright 2006, 2007, 2009 Free Software Foundation, Inc.
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# This file is part of GNU Radio
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# GNU Radio is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3, or (at your option)
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# GNU Radio is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with GNU Radio; see the file COPYING. If not, write to
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# the Free Software Foundation, Inc., 51 Franklin Street,
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# Boston, MA 02110-1301, USA.
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from gnuradio import gr, blks2
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from gnuradio import eng_notation
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from gnuradio.eng_option import eng_option
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from optparse import OptionParser
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import random, time, struct, sys, math, os
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from transmit_path import transmit_path
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from receive_path import receive_path
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class my_top_block(gr.top_block):
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def __init__(self, callback, options):
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gr.top_block.__init__(self)
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if not options.channel_off:
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SNR = 10.0**(options.snr/10.0)
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power_in_signal = abs(options.tx_amplitude)**2.0
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noise_power_in_channel = power_in_signal/SNR
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noise_voltage = math.sqrt(noise_power_in_channel/2.0)
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print "Noise voltage: ", noise_voltage
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frequency_offset = options.frequency_offset / options.fft_length
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print "Frequency offset: ", frequency_offset
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if options.multipath_on:
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taps = [1.0, .2, 0.0, .1, .08, -.4, .12, -.2, 0, 0, 0, .3]
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frequency_offset = 0.0
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symbols_per_packet = math.ceil(((4+options.size+4) * 8) / options.occupied_tones)
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samples_per_packet = (symbols_per_packet+2) * (options.fft_length+options.cp_length)
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print "Symbols per Packet: ", symbols_per_packet
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print "Samples per Packet: ", samples_per_packet
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if options.discontinuous:
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stream_size = [100000, int(options.discontinuous*samples_per_packet)]
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stream_size = [0, 100000]
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self.zeros = gr.vector_source_c(z, True)
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self.txpath = transmit_path(options)
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#self.mux = gr.stream_mux(gr.sizeof_gr_complex, stream_size)
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self.throttle = gr.throttle(gr.sizeof_gr_complex, options.sample_rate)
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self.channel = gr.channel_model(noise_voltage, frequency_offset,
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options.clockrate_ratio, taps)
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self.rxpath = receive_path(callback, options)
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#self.connect(self.zeros, (self.mux,0))
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#self.connect(self.txpath, (self.mux,1))
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#self.connect(self.mux, self.throttle, self.channel, self.rxpath)
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#self.connect(self.mux, self.throttle, self.rxpath)
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self.connect(self.txpath, self.throttle, self.channel, self.rxpath)
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self.connect(self.txpath, gr.file_sink(gr.sizeof_gr_complex, "txpath.dat"))
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#self.connect(self.mux, gr.file_sink(gr.sizeof_gr_complex, "mux.dat"))
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#self.connect(self.channel, gr.file_sink(gr.sizeof_gr_complex, "channel.dat"))
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# /////////////////////////////////////////////////////////////////////////////
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# /////////////////////////////////////////////////////////////////////////////
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global n_rcvd, n_right
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def send_pkt(payload='', eof=False):
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return tb.txpath.send_pkt(payload, eof)
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def rx_callback(ok, payload):
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global n_rcvd, n_right
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(pktno,) = struct.unpack('!H', payload[0:2])
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print "ok: %r \t pktno: %d \t n_rcvd: %d \t n_right: %d" % (ok, pktno, n_rcvd, n_right)
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for x in payload[2:]:
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t = hex(ord(x)).replace('0x', '')
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printable = ''.join(printlst)
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parser = OptionParser(option_class=eng_option, conflict_handler="resolve")
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expert_grp = parser.add_option_group("Expert")
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parser.add_option("-s", "--size", type="eng_float", default=400,
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help="set packet size [default=%default]")
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parser.add_option("-M", "--megabytes", type="eng_float", default=1.0,
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help="set megabytes to transmit [default=%default]")
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parser.add_option("-r", "--sample-rate", type="eng_float", default=1e5,
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help="limit sample rate to RATE in throttle (%default)")
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parser.add_option("", "--snr", type="eng_float", default=30,
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help="set the SNR of the channel in dB [default=%default]")
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parser.add_option("", "--frequency-offset", type="eng_float", default=0,
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help="set frequency offset introduced by channel [default=%default]")
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parser.add_option("", "--clockrate-ratio", type="eng_float", default=1.0,
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help="set clock rate ratio (sample rate difference) between two systems [default=%default]")
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parser.add_option("","--discontinuous", type="int", default=0,
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help="enable discontinous transmission, burst of N packets [Default is continuous]")
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parser.add_option("","--channel-off", action="store_true", default=False,
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help="Turns AWGN, freq offset channel off")
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parser.add_option("","--multipath-on", action="store_true", default=False,
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help="enable multipath")
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transmit_path.add_options(parser, expert_grp)
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receive_path.add_options(parser, expert_grp)
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blks2.ofdm_mod.add_options(parser, expert_grp)
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blks2.ofdm_demod.add_options(parser, expert_grp)
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(options, args) = parser.parse_args ()
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tb = my_top_block(rx_callback, options)
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r = gr.enable_realtime_scheduling()
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# print "Warning: failed to enable realtime scheduling"
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tb.start() # start flow graph
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# generate and send packets
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nbytes = int(1e6 * options.megabytes)
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pkt_size = int(options.size)
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#r = ''.join([chr(random.randint(0,255)) for i in range(pkt_size-2)])
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#pkt_contents = struct.pack('!H', pktno) + r
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pkt_contents = struct.pack('!H', pktno) + (pkt_size - 2) * chr(pktno & 0xff)
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send_pkt(pkt_contents)
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#sys.stderr.write('.')
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#if options.discontinuous and pktno % 5 == 4:
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tb.wait() # wait for it to finish
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if __name__ == '__main__':
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except KeyboardInterrupt: