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Diffstat (limited to 'gr-digital/examples/ofdm/benchmark_ofdm.py')
| -rwxr-xr-x | gr-digital/examples/ofdm/benchmark_ofdm.py | 187 |
1 files changed, 187 insertions, 0 deletions
diff --git a/gr-digital/examples/ofdm/benchmark_ofdm.py b/gr-digital/examples/ofdm/benchmark_ofdm.py new file mode 100755 index 000000000..6d6ca9f2a --- /dev/null +++ b/gr-digital/examples/ofdm/benchmark_ofdm.py @@ -0,0 +1,187 @@ +#!/usr/bin/env python +# +# Copyright 2006, 2007, 2009 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, blks2 +from gnuradio import eng_notation +from gnuradio.eng_option import eng_option +from optparse import OptionParser + +import random, time, struct, sys, math, os + +# from current dir +from transmit_path import transmit_path +from receive_path import receive_path + + +class my_top_block(gr.top_block): + def __init__(self, callback, options): + gr.top_block.__init__(self) + + if not options.channel_off: + SNR = 10.0**(options.snr/10.0) + power_in_signal = abs(options.tx_amplitude)**2.0 + noise_power_in_channel = power_in_signal/SNR + noise_voltage = math.sqrt(noise_power_in_channel/2.0) + print "Noise voltage: ", noise_voltage + + frequency_offset = options.frequency_offset / options.fft_length + print "Frequency offset: ", frequency_offset + + if options.multipath_on: + taps = [1.0, .2, 0.0, .1, .08, -.4, .12, -.2, 0, 0, 0, .3] + else: + taps = [1.0, 0.0] + + else: + noise_voltage = 0.0 + frequency_offset = 0.0 + taps = [1.0, 0.0] + + symbols_per_packet = math.ceil(((4+options.size+4) * 8) / options.occupied_tones) + samples_per_packet = (symbols_per_packet+2) * (options.fft_length+options.cp_length) + print "Symbols per Packet: ", symbols_per_packet + print "Samples per Packet: ", samples_per_packet + if options.discontinuous: + stream_size = [100000, int(options.discontinuous*samples_per_packet)] + else: + stream_size = [0, 100000] + + z = [0,] + self.zeros = gr.vector_source_c(z, True) + self.txpath = transmit_path(options) + + #self.mux = gr.stream_mux(gr.sizeof_gr_complex, stream_size) + self.throttle = gr.throttle(gr.sizeof_gr_complex, options.sample_rate) + self.channel = gr.channel_model(noise_voltage, frequency_offset, + options.clockrate_ratio, taps) + self.rxpath = receive_path(callback, options) + + #self.connect(self.zeros, (self.mux,0)) + #self.connect(self.txpath, (self.mux,1)) + #self.connect(self.mux, self.throttle, self.channel, self.rxpath) + #self.connect(self.mux, self.throttle, self.rxpath) + self.connect(self.txpath, self.throttle, self.channel, self.rxpath) + + if options.log: + self.connect(self.txpath, gr.file_sink(gr.sizeof_gr_complex, "txpath.dat")) + #self.connect(self.mux, gr.file_sink(gr.sizeof_gr_complex, "mux.dat")) + #self.connect(self.channel, gr.file_sink(gr.sizeof_gr_complex, "channel.dat")) + +# ///////////////////////////////////////////////////////////////////////////// +# main +# ///////////////////////////////////////////////////////////////////////////// + +def main(): + global n_rcvd, n_right + + n_rcvd = 0 + n_right = 0 + + def send_pkt(payload='', eof=False): + return tb.txpath.send_pkt(payload, eof) + + def rx_callback(ok, payload): + global n_rcvd, n_right + n_rcvd += 1 + (pktno,) = struct.unpack('!H', payload[0:2]) + if ok: + n_right += 1 + print "ok: %r \t pktno: %d \t n_rcvd: %d \t n_right: %d" % (ok, pktno, n_rcvd, n_right) + + printlst = list() + for x in payload[2:]: + t = hex(ord(x)).replace('0x', '') + if(len(t) == 1): + t = '0' + t + printlst.append(t) + printable = ''.join(printlst) + + print printable + print "\n" + + parser = OptionParser(option_class=eng_option, conflict_handler="resolve") + expert_grp = parser.add_option_group("Expert") + parser.add_option("-s", "--size", type="eng_float", default=400, + help="set packet size [default=%default]") + parser.add_option("-M", "--megabytes", type="eng_float", default=1.0, + help="set megabytes to transmit [default=%default]") + parser.add_option("-r", "--sample-rate", type="eng_float", default=1e5, + help="limit sample rate to RATE in throttle (%default)") + parser.add_option("", "--snr", type="eng_float", default=30, + help="set the SNR of the channel in dB [default=%default]") + parser.add_option("", "--frequency-offset", type="eng_float", default=0, + help="set frequency offset introduced by channel [default=%default]") + parser.add_option("", "--clockrate-ratio", type="eng_float", default=1.0, + help="set clock rate ratio (sample rate difference) between two systems [default=%default]") + parser.add_option("","--discontinuous", type="int", default=0, + help="enable discontinous transmission, burst of N packets [Default is continuous]") + parser.add_option("","--channel-off", action="store_true", default=False, + help="Turns AWGN, freq offset channel off") + parser.add_option("","--multipath-on", action="store_true", default=False, + help="enable multipath") + + transmit_path.add_options(parser, expert_grp) + receive_path.add_options(parser, expert_grp) + blks2.ofdm_mod.add_options(parser, expert_grp) + blks2.ofdm_demod.add_options(parser, expert_grp) + + (options, args) = parser.parse_args () + + # build the graph + tb = my_top_block(rx_callback, options) + + r = gr.enable_realtime_scheduling() + # if r != gr.RT_OK: + # print "Warning: failed to enable realtime scheduling" + + tb.start() # start flow graph + + # generate and send packets + nbytes = int(1e6 * options.megabytes) + n = 0 + pktno = 0 + pkt_size = int(options.size) + + while n < nbytes: + #r = ''.join([chr(random.randint(0,255)) for i in range(pkt_size-2)]) + #pkt_contents = struct.pack('!H', pktno) + r + + pkt_contents = struct.pack('!H', pktno) + (pkt_size - 2) * chr(pktno & 0xff) + + send_pkt(pkt_contents) + n += pkt_size + #sys.stderr.write('.') + #if options.discontinuous and pktno % 5 == 4: + # time.sleep(1) + pktno += 1 + + send_pkt(eof=True) + tb.wait() # wait for it to finish + + +if __name__ == '__main__': + try: + main() + except KeyboardInterrupt: + pass + + |