#!/usr/bin/env python
#
-# Copyright 2005, 2006 Free Software Foundation, Inc.
+# 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 2, or (at your option)
+# 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,
# Boston, MA 02110-1301, USA.
#
-from gnuradio import gr, gru, modulation_utils
-from gnuradio import usrp
+from gnuradio import gr, blks2
from gnuradio import eng_notation
from gnuradio.eng_option import eng_option
from optparse import OptionParser
# 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):
+class my_top_block(gr.top_block):
def __init__(self, callback, options):
- gr.flow_graph.__init__(self)
+ gr.top_block.__init__(self)
- channel_on = True
+ 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
- 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.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
+ 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:
- #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:
- 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"))
+ 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
# /////////////////////////////////////////////////////////////////////////////
n_right = 0
def send_pkt(payload='', eof=False):
- return fg.txpath.send_pkt(payload, eof)
+ return tb.txpath.send_pkt(payload, eof)
def rx_callback(ok, payload):
global n_rcvd, n_right
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=1450,
+ 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="set sample rate to RATE (%default)")
+ 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("","--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-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)
- ofdm.ofdm_mod.add_options(parser, expert_grp)
- ofdm.ofdm_demod.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 ()
-
- 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)
+ tb = my_top_block(rx_callback, options)
r = gr.enable_realtime_scheduling()
# if r != gr.RT_OK:
# print "Warning: failed to enable realtime scheduling"
-
- fg.start() # start flow graph
+
+ tb.start() # start flow graph
# generate and send packets
nbytes = int(1e6 * options.megabytes)
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('.')
pktno += 1
send_pkt(eof=True)
- fg.wait() # wait for it to finish
+ tb.wait() # wait for it to finish
if __name__ == '__main__':
projects / debian / gnuradio / blobdiff