#!/usr/bin/env python # # Copyright 2005, 2006, 2007 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. # from gnuradio import gr, gru, modulation_utils, blks2 from gnuradio import eng_notation from gnuradio.eng_option import eng_option from optparse import OptionParser import random, time, struct, sys, math # from current dir from transmit_path_lb import transmit_path from receive_path_lb import receive_path import fusb_options msg_src = gr.message_source(gr.sizeof_short) in_msg_q = msg_src.msgq() #out_msg_q = gr.msg_queue() class my_top_block(gr.top_block): def __init__(self, mod_class, demod_class, rx_callback, options): gr.top_block.__init__(self) channelon = True; SNR = 10.0**(options.snr/10.0) frequency_offset = options.frequency_offset power_in_signal = abs(options.tx_amplitude)**2 noise_power = power_in_signal/SNR noise_voltage = math.sqrt(noise_power) self.txpath = transmit_path(mod_class, options) self.throttle = gr.throttle(gr.sizeof_gr_complex, options.sample_rate) self.rxpath = receive_path(demod_class, rx_callback, options) self.add = gr.add_const_ss(1) #self.msg_sink = gr.message_sink(gr.sizeof_short, out_msg_q, False) self.msg_sink = gr.file_descriptor_sink(gr.sizeof_short, 1) self.connect(msg_src, self.add, self.msg_sink) if channelon: self.channel = blks2.channel_model(noise_voltage, frequency_offset, 1.01) if options.discontinuous: z = 20000*[0,] self.zeros = gr.vector_source_c(z, True) packet_size = 5*((4+8+4+1500+4) * 8) self.mux = gr.stream_mux(gr.sizeof_gr_complex, [packet_size-0, int(9e5)]) # Connect components self.connect(self.txpath, (self.mux,0)) self.connect(self.zeros, (self.mux,1)) self.connect(self.mux, self.channel, self.rxpath) else: self.connect(self.txpath, self.channel, self.rxpath) else: # Connect components self.connect(self.txpath, self.throttle, self.rxpath) # ///////////////////////////////////////////////////////////////////////////// # main # ///////////////////////////////////////////////////////////////////////////// def main(): global n_rcvd, n_right n_rcvd = 0 n_right = 0 def rx_callback(ok, payload): global n_rcvd, n_right (pktno,) = struct.unpack('!H', payload[0:2]) n_rcvd += 1 if ok: n_right += 1 #print "ok = %5s pktno = %4d n_rcvd = %4d n_right = %4d" % (ok, pktno, n_rcvd, n_right) #print "got: %s" % payload[2:len(payload)] in_msg_q.insert_tail(gr.message_from_string(payload[2:len(payload)])) def send_pkt(payload='', eof=False): return tb.txpath.send_pkt(payload, eof) mods = modulation_utils.type_1_mods() demods = modulation_utils.type_1_demods() parser = OptionParser(option_class=eng_option, conflict_handler="resolve") expert_grp = parser.add_option_group("Expert") channel_grp = parser.add_option_group("Channel") parser.add_option("-m", "--modulation", type="choice", choices=mods.keys(), default='dbpsk', help="Select modulation from: %s [default=%%default]" % (', '.join(mods.keys()),)) parser.add_option("-s", "--size", type="eng_float", default=1500, help="set packet size [default=%default]") parser.add_option("-M", "--megabytes", type="eng_float", default=0.01, help="set megabytes to transmit [default=%default]") parser.add_option("","--discontinuous", action="store_true", default=False, help="enable discontinous transmission (bursts of 5 packets)") channel_grp.add_option("", "--sample-rate", type="eng_float", default=1e5, help="set speed of channel/simulation rate to RATE [default=%default]") channel_grp.add_option("", "--snr", type="eng_float", default=30, help="set the SNR of the channel in dB [default=%default]") channel_grp.add_option("", "--frequency-offset", type="eng_float", default=0, help="set frequency offset introduced by channel [default=%default]") channel_grp.add_option("", "--seed", action="store_true", default=False, help="use a random seed for AWGN noise [default=%default]") transmit_path.add_options(parser, expert_grp) receive_path.add_options(parser, expert_grp) for mod in mods.values(): mod.add_options(expert_grp) for demod in demods.values(): demod.add_options(expert_grp) (options, args) = parser.parse_args () if len(args) != 0: parser.print_help() sys.exit(1) r = gr.enable_realtime_scheduling() if r != gr.RT_OK: print "Warning: failed to enable realtime scheduling" # Create an instance of a hierarchical block tb = my_top_block(mods[options.modulation], demods[options.modulation], rx_callback, options) tb.start() # generate and send packets nbytes = int(1e6 * options.megabytes) n = 0 pktno = 0 pkt_size = int(options.size) print 'Sending some packets...' while n < nbytes: send_pkt(struct.pack('!H', pktno & 0xffff) + 'ASDF') n += pkt_size pktno += 1 print 'Sending termination packet...' send_pkt(eof=True) print 'Waiting for top-block to finish...' tb.wait() print 'Finished.' if __name__ == '__main__': try: main() except KeyboardInterrupt: pass