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[Commit-gnuradio] r4173 - gnuradio/branches/developers/n4hy/ofdm/gnuradi
From: |
trondeau |
Subject: |
[Commit-gnuradio] r4173 - gnuradio/branches/developers/n4hy/ofdm/gnuradio-examples/python/ofdm |
Date: |
Wed, 20 Dec 2006 18:27:42 -0700 (MST) |
Author: trondeau
Date: 2006-12-20 18:27:41 -0700 (Wed, 20 Dec 2006)
New Revision: 4173
Added:
gnuradio/branches/developers/n4hy/ofdm/gnuradio-examples/python/ofdm/benchmark_ofdm.py
gnuradio/branches/developers/n4hy/ofdm/gnuradio-examples/python/ofdm/ofdm.py
gnuradio/branches/developers/n4hy/ofdm/gnuradio-examples/python/ofdm/receive_path_simple.py
gnuradio/branches/developers/n4hy/ofdm/gnuradio-examples/python/ofdm/transmit_path_simple.py
Log:
loopback test flowgraph for OFDM (working and ready to test sampler)
Added:
gnuradio/branches/developers/n4hy/ofdm/gnuradio-examples/python/ofdm/benchmark_ofdm.py
===================================================================
---
gnuradio/branches/developers/n4hy/ofdm/gnuradio-examples/python/ofdm/benchmark_ofdm.py
(rev 0)
+++
gnuradio/branches/developers/n4hy/ofdm/gnuradio-examples/python/ofdm/benchmark_ofdm.py
2006-12-21 01:27:41 UTC (rev 4173)
@@ -0,0 +1,157 @@
+#!/usr/bin/env python
+#
+# Copyright 2005, 2006 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)
+# 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
+from gnuradio import usrp
+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_simple import transmit_path
+from receive_path_simple 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,1)
+ self.offset = gr.sig_source_c((sample_rate*1.0), 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.noise,(self.noise_adder,0))
+
+ if 0:
+ self.throttle = gr.throttle(gr.sizeof_gr_complex, 1e5)
+ fg.connect(self.mixer_offset, self.throttle, (self.noise_adder,1))
+ else:
+ fg.connect(self.mixer_offset, (self.noise_adder,1))
+
+ gr.hier_block.__init__(self, fg, self.input, self.noise_adder)
+
+class my_graph(gr.flow_graph):
+ def __init__(self, callback, options):
+ gr.flow_graph.__init__(self)
+
+ channel_on = False
+
+ SNR = 10.0**(options.snr/10.0)
+ frequency_offset = options.frequency_offset / options.fft_length
+
+# print "SNR: %f" % options.snr
+# print "Frequency offset: %f" % options.frequency_offset
+
+ 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.rxpath = receive_path(self, callback, options)
+
+ if channel_on:
+ self.channel = awgn_channel(self, options.sample_rate,
noise_voltage, frequency_offset)
+ self.connect(self.txpath, self.channel)
+ self.connect(self.channel, self.rxpath)
+ else:
+ self.connect(self.txpath, 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"))
+
+
+# /////////////////////////////////////////////////////////////////////////////
+# main
+# /////////////////////////////////////////////////////////////////////////////
+
+def main():
+ global n_rcvd, n_right
+
+ n_rcvd = 0
+ n_right = 0
+
+ def send_pkt(payload='', eof=False):
+ return fg.txpath.send_pkt(payload, eof)
+
+ def rx_callback(ok, payload):
+ global n_rcvd, n_right
+ n_rcvd += 1
+ if ok:
+ n_right += 1
+ print "ok: %r \t n_rcvd: %d \t n_right: %d" % (ok, n_rcvd, n_right)
+
+ 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=1500,
+ 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=48000,
+ help="set sample rate to RATE (%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]")
+ transmit_path.add_options(parser, expert_grp)
+ ofdm.ofdm_mod.add_options(parser, expert_grp)
+ ofdm.ofdm_demod.add_options(parser, expert_grp)
+
+ (options, args) = parser.parse_args ()
+
+ # build the graph
+ fg = my_graph(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
+
+ # generate and send packets
+ nbytes = int(1e6 * options.megabytes)
+ n = 0
+ pktno = 0
+ pkt_size = int(options.size)
+
+ while n < nbytes:
+ 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)
+ fg.wait() # wait for it to finish
+
+if __name__ == '__main__':
+ try:
+ main()
+ except KeyboardInterrupt:
+ pass
Property changes on:
gnuradio/branches/developers/n4hy/ofdm/gnuradio-examples/python/ofdm/benchmark_ofdm.py
___________________________________________________________________
Name: svn:executable
+ *
Added:
gnuradio/branches/developers/n4hy/ofdm/gnuradio-examples/python/ofdm/ofdm.py
===================================================================
---
gnuradio/branches/developers/n4hy/ofdm/gnuradio-examples/python/ofdm/ofdm.py
(rev 0)
+++
gnuradio/branches/developers/n4hy/ofdm/gnuradio-examples/python/ofdm/ofdm.py
2006-12-21 01:27:41 UTC (rev 4173)
@@ -0,0 +1,134 @@
+#!/usr/bin/env python
+#
+# Copyright 2004,2005,2006 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)
+# 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
+from optparse import OptionParser
+from ofdm_receiver import ofdm_receiver
+
+class ofdm_mod(gr.hier_block):
+ def __init__(self, fg, options):
+ self.fg = fg
+ self._occupied_tones = options.occupied_tones
+ self._fft_length = options.fft_length
+ self._cp_length = options.cp_length
+
+ symbol_length = self._fft_length + self._cp_length
+
+ if self._fft_length < self._occupied_tones:
+ sys.stderr.write("occupied tones must be less than FFT length\n")
+ raise SystemExit
+ if self._fft_length < self._cp_length:
+ sys.stderr.write("cyclic prefix length must be less than FFT
length\n")
+ raise SystemExit
+
+ win = [] #[1 for i in range(self._fft_length)]
+
+ self.ofdm = gr.ofdm_bpsk_mapper(1500, self._occupied_tones,
self._fft_length)
+ self.ifft = gr.fft_vcc(self._fft_length, False, win, True)
+ self.cp_adder = gr.ofdm_cyclic_prefixer(self._fft_length,
symbol_length)
+
+ if options.verbose:
+ self._print_verbage()
+
+ self.fg.connect(self.ofdm, self.ifft, self.cp_adder)
+ gr.hier_block.__init__(self, self.fg, self.ofdm, self.cp_adder)
+
+ def samples_per_symbol(self):
+ return 2
+
+ def bits_per_symbol(self=None): # staticmethod that's also callable on
an instance
+ return 1
+ bits_per_symbol = staticmethod(bits_per_symbol) # make it a static
method. RTFM
+
+ def add_options(normal, expert):
+ """
+ Adds OFDM-specific options to the Options Parser
+ """
+ expert.add_option("", "--fft-length", type="intx", default=512,
+ help="set the number of FFT bins [default=%default]")
+ expert.add_option("", "--occupied-tones", type="intx", default=480,
+ help="set the number of occupied FFT bins
[default=%default]")
+ expert.add_option("", "--cp-length", type="intx", default=32,
+ help="set the number of bits in the cyclic prefix
[default=%default]")
+ # Make a static method to call before instantiation
+ add_options = staticmethod(add_options)
+
+ def _print_verbage(self):
+ """
+ Prints information about the OFDM modulator
+ """
+ print "\nOFDM Modulator:"
+ print "FFT length: %3d" % (self._fft_length)
+ print "Occupied Tones: %3d" % (self._occupied_tones)
+ print "CP length: %3d" % (self._cp_length)
+
+
+class ofdm_demod(gr.hier_block):
+ def __init__(self, fg, options):
+ self.fg = fg
+ self._occupied_tones = options.occupied_tones
+ self._fft_length = options.fft_length
+ self._cp_length = options.cp_length
+ self._snr = options.snr
+
+ symbol_length = self._fft_length + self._cp_length
+
+ win = [1 for i in range(self._fft_length)]
+
+ # ML Sync
+ self.ofdm_rx = ofdm_receiver(self.fg, self._fft_length, symbol_length,
self._snr)
+
+ # OFDM Demod
+ self.fftdemod = gr.fft_vcc(self._fft_length, True, win, True)
+ self.ofdm = gr.ofdm_bpsk_demapper(self._occupied_tones,
self._fft_length)
+
+ if options.verbose:
+ self._print_verbage()
+
+ self.fg.connect(self.ofdm_rx, self.fftdemod, self.ofdm)
+ gr.hier_block.__init__(self, self.fg, self.ofdm_rx, self.ofdm)
+
+ def bits_per_symbol(self=None): # staticmethod that's also callable on
an instance
+ return 1
+ bits_per_symbol = staticmethod(bits_per_symbol) # make it a static
method. RTFM
+
+ def add_options(normal, expert):
+ """
+ Adds OFDM-specific options to the Options Parser
+ """
+ expert.add_option("", "--fft-length", type="intx", default=512,
+ help="set the number of FFT bins [default=%default]")
+ expert.add_option("", "--occupied-tones", type="intx", default=480,
+ help="set the number of occupied FFT bins
[default=%default]")
+ expert.add_option("", "--cp-length", type="intx", default=32,
+ help="set the number of bits in the cyclic prefix
[default=%default]")
+ # Make a static method to call before instantiation
+ add_options = staticmethod(add_options)
+
+ def _print_verbage(self):
+ """
+ Prints information about the OFDM demodulator
+ """
+ print "\nOFDM Demodulator:"
+ print "FFT length: %3d" % (self._fft_length)
+ print "Occupied Tones: %3d" % (self._occupied_tones)
+ print "CP length: %3d" % (self._cp_length)
Added:
gnuradio/branches/developers/n4hy/ofdm/gnuradio-examples/python/ofdm/receive_path_simple.py
===================================================================
---
gnuradio/branches/developers/n4hy/ofdm/gnuradio-examples/python/ofdm/receive_path_simple.py
(rev 0)
+++
gnuradio/branches/developers/n4hy/ofdm/gnuradio-examples/python/ofdm/receive_path_simple.py
2006-12-21 01:27:41 UTC (rev 4173)
@@ -0,0 +1,93 @@
+#!/usr/bin/env python
+#
+# Copyright 2005,2006 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)
+# 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, blks
+from gnuradio import usrp
+from gnuradio import eng_notation
+import copy
+import sys
+
+import ofdm
+
+# /////////////////////////////////////////////////////////////////////////////
+# receive path
+# /////////////////////////////////////////////////////////////////////////////
+
+class receive_path(gr.hier_block):
+ def __init__(self, fg, rx_callback, options):
+
+ options = copy.copy(options) # make a copy so we can destructively
modify
+
+ self._verbose = options.verbose
+ self._samples_per_symbol = options.samples_per_symbol # desired
samples/symbol
+
+ self._rx_callback = rx_callback # this callback is fired when
there's a packet available
+
+ # Design filter to get actual channel we want
+ sw_decim = 1
+ bw = float(options.occupied_tones+25) / float(options.fft_length)
+ print options.occupied_tones
+ print options.fft_length
+ print bw
+ chan_coeffs = gr.firdes.low_pass (1.0, # gain
+ 2.0, # sampling rate
+ bw, # midpoint of
trans. band
+ 1*bw, # width of
trans. band
+ gr.firdes.WIN_KAISER) # filter
type
+
+ # Decimating channel filter
+ self.chan_filt = gr.fft_filter_ccc(sw_decim, chan_coeffs)
+
+ self.ofdm_demod = ofdm.ofdm_demod(fg, options)
+
+ # receiver
+ self.packet_receiver = \
+ blks.demod_ofdm_pkts(fg,
+ self.ofdm_demod,
+ access_code=None,
+ callback=self._rx_callback,
+ threshold=-1)
+
+ if 0:
+ fg.connect(self.chan_filt, self.packet_receiver)
+ gr.hier_block.__init__(self, fg, self.chan_filt, None)
+ else:
+ gr.hier_block.__init__(self, fg, self.packet_receiver, None)
+
+ def add_options(normal, expert):
+ """
+ Adds receiver-specific options to the Options Parser
+ """
+ normal.add_option("-v", "--verbose", action="store_true",
default=False)
+ expert.add_option("", "--log", action="store_true", default=False,
+ help="Log all parts of flow graph to files (CAUTION:
lots of data)")
+ expert.add_option("-S", "--samples-per-symbol", type="int", default=2,
+ help="set samples/symbol [default=%default]")
+
+ # Make a static method to call before instantiation
+ add_options = staticmethod(add_options)
+
+ def _print_verbage(self):
+ """
+ Prints information about the receive path
+ """
+ pass
Added:
gnuradio/branches/developers/n4hy/ofdm/gnuradio-examples/python/ofdm/transmit_path_simple.py
===================================================================
---
gnuradio/branches/developers/n4hy/ofdm/gnuradio-examples/python/ofdm/transmit_path_simple.py
(rev 0)
+++
gnuradio/branches/developers/n4hy/ofdm/gnuradio-examples/python/ofdm/transmit_path_simple.py
2006-12-21 01:27:41 UTC (rev 4173)
@@ -0,0 +1,80 @@
+#
+# Copyright 2005,2006 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)
+# 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, blks
+from gnuradio import usrp
+from gnuradio import eng_notation
+
+import copy
+import sys
+
+import ofdm
+
+# /////////////////////////////////////////////////////////////////////////////
+# transmit path
+# /////////////////////////////////////////////////////////////////////////////
+
+class transmit_path(gr.hier_block):
+ def __init__(self, fg, options):
+ '''
+ See below for what options should hold
+ '''
+ options = copy.copy(options) # make a copy so we can destructively
modify
+
+ self._verbose = options.verbose
+ self._samples_per_symbol = options.samples_per_symbol # desired
samples/baud
+
+ self.ofdm_mod = ofdm.ofdm_mod(fg, options)
+ self.packet_transmitter = \
+ blks.mod_ofdm_pkts(fg,
+ self.ofdm_mod,
+ mtu=1500,
+ access_code=None,
+ msgq_limit=4,
+ pad_for_usrp=False)
+
+ gr.hier_block.__init__(self, fg, None, self.packet_transmitter)
+
+ def send_pkt(self, payload='', eof=False):
+ """
+ Calls the transmitter method to send a packet
+ """
+ return self.packet_transmitter.send_pkt(payload, eof)
+
+ def add_options(normal, expert):
+ """
+ Adds transmitter-specific options to the Options Parser
+ """
+ normal.add_option("-v", "--verbose", action="store_true",
default=False)
+
+ expert.add_option("-S", "--samples-per-symbol", type="int", default=2,
+ help="set samples/symbol [default=%default]")
+ expert.add_option("", "--log", action="store_true", default=False,
+ help="Log all parts of flow graph to file (CAUTION:
lots of data)")
+
+ # Make a static method to call before instantiation
+ add_options = staticmethod(add_options)
+
+ def _print_verbage(self):
+ """
+ Prints information about the transmit path
+ """
+ pass
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