3 # Copyright 2005, 2006, 2007, 2009 Free Software Foundation, Inc.
5 # This file is part of GNU Radio
7 # GNU Radio is free software; you can redistribute it and/or modify
8 # it under the terms of the GNU General Public License as published by
9 # the Free Software Foundation; either version 3, or (at your option)
12 # GNU Radio is distributed in the hope that it will be useful,
13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 # GNU General Public License for more details.
17 # You should have received a copy of the GNU General Public License
18 # along with GNU Radio; see the file COPYING. If not, write to
19 # the Free Software Foundation, Inc., 51 Franklin Street,
20 # Boston, MA 02110-1301, USA.
23 from gnuradio import gr, gru, modulation_utils
24 from gnuradio import eng_notation
25 from gnuradio.eng_option import eng_option
26 from optparse import OptionParser
28 import random, time, struct, sys, math
31 from transmit_path import transmit_path
32 from receive_path import receive_path
34 class my_top_block(gr.top_block):
35 def __init__(self, mod_class, demod_class, rx_callback, options):
36 gr.top_block.__init__(self)
40 SNR = 10.0**(options.snr/10.0)
41 frequency_offset = options.frequency_offset
43 power_in_signal = abs(options.tx_amplitude)**2
44 noise_power = power_in_signal/SNR
45 noise_voltage = math.sqrt(noise_power)
47 # With new interface, sps does not get set by default, but
48 # in the loopback, we don't recalculate it; so just force it here
49 if(options.samples_per_symbol == None):
50 options.samples_per_symbol = 2
52 self.txpath = transmit_path(mod_class, options)
53 self.throttle = gr.throttle(gr.sizeof_gr_complex, options.sample_rate)
54 self.rxpath = receive_path(demod_class, rx_callback, options)
57 self.channel = gr.channel_model(noise_voltage, frequency_offset, 1.01)
59 if options.discontinuous:
61 self.zeros = gr.vector_source_c(z, True)
62 packet_size = 5*((4+8+4+1500+4) * 8)
63 self.mux = gr.stream_mux(gr.sizeof_gr_complex, [packet_size-0, int(9e5)])
66 self.connect(self.txpath, (self.mux,0))
67 self.connect(self.zeros, (self.mux,1))
68 self.connect(self.mux, self.channel, self.rxpath)
71 self.connect(self.txpath, self.channel, self.rxpath)
75 self.connect(self.txpath, self.throttle, self.rxpath)
78 # /////////////////////////////////////////////////////////////////////////////
80 # /////////////////////////////////////////////////////////////////////////////
84 global n_rcvd, n_right
89 def rx_callback(ok, payload):
90 global n_rcvd, n_right
91 (pktno,) = struct.unpack('!H', payload[0:2])
96 print "ok = %5s pktno = %4d n_rcvd = %4d n_right = %4d" % (
97 ok, pktno, n_rcvd, n_right)
98 # print payload[2:len(payload)]
100 def send_pkt(payload='', eof=False):
101 return tb.txpath.send_pkt(payload, eof)
104 mods = modulation_utils.type_1_mods()
105 demods = modulation_utils.type_1_demods()
107 parser = OptionParser(option_class=eng_option, conflict_handler="resolve")
108 expert_grp = parser.add_option_group("Expert")
109 channel_grp = parser.add_option_group("Channel")
111 parser.add_option("-m", "--modulation", type="choice", choices=mods.keys(),
113 help="Select modulation from: %s [default=%%default]"
114 % (', '.join(mods.keys()),))
116 parser.add_option("-s", "--size", type="eng_float", default=1500,
117 help="set packet size [default=%default]")
118 parser.add_option("-M", "--megabytes", type="eng_float", default=1.0,
119 help="set megabytes to transmit [default=%default]")
120 parser.add_option("","--discontinuous", action="store_true", default=False,
121 help="enable discontinous transmission (bursts of 5 packets)")
123 channel_grp.add_option("", "--sample-rate", type="eng_float", default=1e5,
124 help="set speed of channel/simulation rate to RATE [default=%default]")
125 channel_grp.add_option("", "--snr", type="eng_float", default=30,
126 help="set the SNR of the channel in dB [default=%default]")
127 channel_grp.add_option("", "--frequency-offset", type="eng_float", default=0,
128 help="set frequency offset introduced by channel [default=%default]")
129 channel_grp.add_option("", "--seed", action="store_true", default=False,
130 help="use a random seed for AWGN noise [default=%default]")
132 transmit_path.add_options(parser, expert_grp)
133 receive_path.add_options(parser, expert_grp)
135 for mod in mods.values():
136 mod.add_options(expert_grp)
137 for demod in demods.values():
138 demod.add_options(expert_grp)
140 (options, args) = parser.parse_args ()
146 r = gr.enable_realtime_scheduling()
148 print "Warning: failed to enable realtime scheduling"
150 # Create an instance of a hierarchical block
151 tb = my_top_block(mods[options.modulation], demods[options.modulation], rx_callback, options)
154 # generate and send packets
155 nbytes = int(1e6 * options.megabytes)
158 pkt_size = int(options.size)
161 send_pkt(struct.pack('!H', pktno & 0xffff) + (pkt_size - 2) * chr(pktno & 0xff))
169 if __name__ == '__main__':
172 except KeyboardInterrupt: