diff options
Diffstat (limited to 'gnuradio-examples/python/ofdm/benchmark_ofdm.py')
| -rwxr-xr-x | gnuradio-examples/python/ofdm/benchmark_ofdm.py | 148 |
1 files changed, 69 insertions, 79 deletions
diff --git a/gnuradio-examples/python/ofdm/benchmark_ofdm.py b/gnuradio-examples/python/ofdm/benchmark_ofdm.py index 3b4761d5ee..53f4bd0bf2 100755 --- a/gnuradio-examples/python/ofdm/benchmark_ofdm.py +++ b/gnuradio-examples/python/ofdm/benchmark_ofdm.py @@ -1,6 +1,6 @@ #!/usr/bin/env python # -# Copyright 2005, 2006 Free Software Foundation, Inc. +# Copyright 2006, 2007 Free Software Foundation, Inc. # # This file is part of GNU Radio # @@ -20,90 +20,68 @@ # Boston, MA 02110-1301, USA. # -from gnuradio import gr, gru, modulation_utils -from gnuradio import usrp +from gnuradio import gr, blks from gnuradio import eng_notation from gnuradio.eng_option import eng_option from optparse import OptionParser +from gnuradio.blksimpl import ofdm_pkt import random, time, struct, sys, math, os # from current dir from transmit_path import transmit_path from receive_path import receive_path -import ofdm -class awgn_channel(gr.hier_block): - def __init__(self, fg, sample_rate, noise_voltage, frequency_offset): - - self.input = gr.add_const_cc(0) - - self.noise_adder = gr.add_cc() - self.noise = gr.noise_source_c(gr.GR_GAUSSIAN,noise_voltage) - self.offset = gr.sig_source_c(1, gr.GR_SIN_WAVE, frequency_offset, 1.0, 0.0) - self.mixer_offset = gr.multiply_cc() - - fg.connect(self.input, (self.mixer_offset,0)) - fg.connect(self.offset,(self.mixer_offset,1)) - fg.connect(self.mixer_offset, (self.noise_adder,1)) - fg.connect(self.noise, (self.noise_adder,0)) - - gr.hier_block.__init__(self, fg, self.input, self.noise_adder) - -class multipath_channel(gr.hier_block): - def __init__(self, fg): - - self.taps = [1.0, .2, 0.0, .1, .08, -.4, .12, -.2, 0, 0, 0, .3] - self.chan = gr.fir_filter_ccc(1, self.taps) - - gr.hier_block.__init__(self, fg, self.chan, self.chan) class my_graph(gr.flow_graph): def __init__(self, callback, options): gr.flow_graph.__init__(self) - channel_on = True - - SNR = 10.0**(options.snr/10.0) - frequency_offset = options.frequency_offset / options.fft_length - - power_in_signal = options.occupied_tones - noise_power_in_channel = power_in_signal/SNR - noise_power_required = noise_power_in_channel * options.fft_length / options.occupied_tones - noise_voltage = math.sqrt(noise_power_required) - - self.txpath = transmit_path(self, options) - self.throttle = gr.throttle(gr.sizeof_gr_complex, options.sample_rate) - self.rxpath = receive_path(self, callback, options) - - if channel_on: - self.channel = awgn_channel(self, options.sample_rate, noise_voltage, frequency_offset) - self.multipath = multipath_channel(self) + if options.channel_on: + SNR = 10.0**(options.snr/10.0) + power_in_signal = 1.0 + noise_power_in_channel = power_in_signal/SNR + noise_voltage = math.sqrt(noise_power_in_channel/2.0) + print "Noise voltage: ", noise_voltage - if options.discontinuous: - z = 20000*[0,] - self.zeros = gr.vector_source_c(z, True) - packet_size = 15*((4+8+4+1500+4) * 8) - self.mux = gr.stream_mux(gr.sizeof_gr_complex, [packet_size-0, int(10e5)]) - - # Connect components - self.connect(self.txpath, (self.mux,0)) - self.connect(self.zeros, (self.mux,1)) - self.connect(self.mux, self.throttle, self.channel, self.rxpath) - self.connect(self.mux, gr.file_sink(gr.sizeof_gr_complex, "tx_ofdm.dat")) + frequency_offset = options.frequency_offset / options.fft_length + if options.multipath_on: + taps = [1.0, .2, 0.0, .1, .08, -.4, .12, -.2, 0, 0, 0, .3] else: - #self.connect(self.txpath, self.throttle, self.multipath, self.channel) - self.connect(self.txpath, self.throttle, self.channel) - self.connect(self.channel, self.rxpath) - self.connect(self.txpath, gr.file_sink(gr.sizeof_gr_complex, "tx_ofdm.dat")) - + 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: - self.connect(self.txpath, self.throttle, self.rxpath) - self.connect(self.txpath, gr.file_sink(gr.sizeof_gr_complex, "tx")) - self.connect(self.rxpath.ofdm_demod.ofdm_rx, gr.file_sink(options.fft_length*gr.sizeof_gr_complex, "rx")) + stream_size = [0, 100000] + z = [0,] + self.zeros = gr.vector_source_c(z, True) + self.txpath = transmit_path(self, 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 = blks.channel_model(self, noise_voltage, frequency_offset, options.clockrate_ratio, taps) + self.rxpath = receive_path(self, 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.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 # ///////////////////////////////////////////////////////////////////////////// @@ -124,6 +102,17 @@ def main(): 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") @@ -137,21 +126,22 @@ def main(): 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("","--discontinuous", action="store_true", default=False, - help="enable discontinous transmission (bursts of 5 packets)") + 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-on", action="store_true", default=True, + help="Enables AWGN, freq offset") + 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) - ofdm.ofdm_mod.add_options(parser, expert_grp) - ofdm.ofdm_demod.add_options(parser, expert_grp) + ofdm_pkt.mod_ofdm_pkts.add_options(parser, expert_grp) + ofdm_pkt.demod_ofdm_pkts.add_options(parser, expert_grp) (options, args) = parser.parse_args () - - if(options.mtu < options.size): - sys.stderr.write("MTU (%.0f) must be larger than the packet size (%.0f)\n" - % (options.mtu, options.size)) - sys.exit(1) - + # build the graph fg = my_graph(rx_callback, options) @@ -167,12 +157,12 @@ def main(): 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) + (pkt_size - 2) * chr(pktno & 0xff) - pkt_contents = struct.pack('!H', pktno) + r + #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('.') |