arity = pow(2,self.bits_per_symbol())
# Automatic gain control
- scale = (1.0/16384.0)
- self.pre_scaler = gr.multiply_const_cc(scale) # scale the signal from full-range to +-1
- #self.agc = gr.agc2_cc(0.6e-1, 1e-3, 1, 1, 100)
- self.agc = gr.feedforward_agc_cc(16, 2.0)
+ #scale = (1.0/16384.0)
+ #self.pre_scaler = gr.multiply_const_cc(scale) # scale the signal from full-range to +-1
+ self.agc = gr.agc2_cc(0.6e-1, 1e-3, 1, 1, 100)
+ #self.agc = gr.feedforward_agc_cc(16, 2.0)
# RRC data filter
ntaps = 11 * samples_per_symbol
self._setup_logging()
# Connect and Initialize base class
- self.connect(self, self.pre_scaler, self.agc, self.rrc_filter, self.receiver,
+ self.connect(self, self.agc, self.rrc_filter, self.receiver,
self.diffdec, self.slicer, self.symbol_mapper, self.unpack, self)
def samples_per_symbol(self):
def set_rx_gain_freq(self, gain_freq):
self._gain_freq = gain_freq
#self._gain_freq_beta = .25 * self._gain_freq * self._gain_freq
+ print self._gain_freq
self.rxpath.packet_receiver._demodulator.freq_recov.set_alpha(self._gain_freq)
+ self.rxpath.packet_receiver._demodulator.freq_recov.set_beta(self._gain_freq/10.0)
#self.rxpath.packet_receiver._demodulator.freq_recov.set_beta(self._gain_fre_beta)
--- /dev/null
+#!/usr/bin/env python
+#
+# Copyright 2005,2006,2007,2009 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, 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
+import struct
+import sys
+
+# from current dir
+import usrp_receive_path2
+
+#import os
+#print os.getpid()
+#raw_input('Attach and press enter: ')
+
+class my_top_block(gr.top_block):
+ def __init__(self, demodulator, rx_callback, options):
+ gr.top_block.__init__(self)
+
+ # Set up receive path
+ self.rxpath = usrp_receive_path.usrp_receive_path(demodulator, rx_callback, options)
+
+ self.connect(self.rxpath)
+
+# /////////////////////////////////////////////////////////////////////////////
+# main
+# /////////////////////////////////////////////////////////////////////////////
+
+global n_rcvd, n_right
+
+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)
+
+
+ demods = modulation_utils.type_1_demods()
+
+ # Create Options Parser:
+ parser = OptionParser (option_class=eng_option, conflict_handler="resolve")
+ expert_grp = parser.add_option_group("Expert")
+
+ parser.add_option("-m", "--modulation", type="choice", choices=demods.keys(),
+ default='gmsk',
+ help="Select modulation from: %s [default=%%default]"
+ % (', '.join(demods.keys()),))
+
+ usrp_receive_path.add_options(parser, expert_grp)
+
+ for mod in demods.values():
+ mod.add_options(expert_grp)
+
+ (options, args) = parser.parse_args ()
+
+ if len(args) != 0:
+ parser.print_help(sys.stderr)
+ sys.exit(1)
+
+ if options.rx_freq is None:
+ sys.stderr.write("You must specify -f FREQ or --freq FREQ\n")
+ parser.print_help(sys.stderr)
+ sys.exit(1)
+
+
+ # build the graph
+ tb = my_top_block(demods[options.modulation], 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
+ tb.wait() # wait for it to finish
+
+if __name__ == '__main__':
+ try:
+ main()
+ except KeyboardInterrupt:
+ pass
from gnuradio import gr
from gnuradio import usrp_options
import receive_path
-from pick_bitrate2 import pick_rx_bitrate
+from pick_bitrate import pick_rx_bitrate
from gnuradio import eng_notation
def add_freq_option(parser):
--- /dev/null
+#
+# Copyright 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
+from gnuradio import usrp_options
+import receive_path
+from pick_bitrate2 import pick_rx_bitrate
+from gnuradio import eng_notation
+
+def add_freq_option(parser):
+ """
+ Hackery that has the -f / --freq option set both tx_freq and rx_freq
+ """
+ def freq_callback(option, opt_str, value, parser):
+ parser.values.rx_freq = value
+ parser.values.tx_freq = value
+
+ if not parser.has_option('--freq'):
+ parser.add_option('-f', '--freq', type="eng_float",
+ action="callback", callback=freq_callback,
+ help="set Tx and/or Rx frequency to FREQ [default=%default]",
+ metavar="FREQ")
+
+def add_options(parser, expert):
+ add_freq_option(parser)
+ usrp_options.add_rx_options(parser)
+ receive_path.receive_path.add_options(parser, expert)
+ expert.add_option("", "--rx-freq", type="eng_float", default=None,
+ help="set Rx frequency to FREQ [default=%default]", metavar="FREQ")
+ parser.add_option("-v", "--verbose", action="store_true", default=False)
+
+class usrp_receive_path(gr.hier_block2):
+
+ def __init__(self, demod_class, rx_callback, options):
+ '''
+ See below for what options should hold
+ '''
+ gr.hier_block2.__init__(self, "usrp_receive_path",
+ gr.io_signature(0, 0, 0), # Input signature
+ gr.io_signature(0, 0, 0)) # Output signature
+ if options.rx_freq is None:
+ sys.stderr.write("-f FREQ or --freq FREQ or --rx-freq FREQ must be specified\n")
+ raise SystemExit
+
+ #setup usrp
+ self._demod_class = demod_class
+ self._setup_usrp_source(options)
+
+ rx_path = receive_path.receive_path(demod_class, rx_callback, options)
+ for attr in dir(rx_path): #forward the methods
+ if not attr.startswith('_') and not hasattr(self, attr):
+ setattr(self, attr, getattr(rx_path, attr))
+
+ #connect
+ self.connect(self.u, rx_path)
+
+ def _setup_usrp_source(self, options):
+ self.u = usrp_options.create_usrp_source(options)
+ adc_rate = self.u.adc_rate()
+ self.rs_rate = options.bitrate
+
+ (self._bitrate, self._samples_per_symbol, self._decim) = \
+ pick_rx_bitrate(options.bitrate, self._demod_class.bits_per_symbol(), \
+ options.samples_per_symbol, options.decim,
+ adc_rate, self.u.get_decim_rates())
+
+ if options.verbose:
+ print 'USRP Source:', self.u
+ print 'Decimation: ', self._decim
+
+ options.samples_per_symbol = self._samples_per_symbol
+ options.decim = self._decim
+
+ self.u.set_decim(self._decim)
+
+ if not self.u.set_center_freq(options.rx_freq):
+ print "Failed to set Rx frequency to %s" % (eng_notation.num_to_str(options.rx_freq))
+ raise ValueError, eng_notation.num_to_str(options.rx_freq)
projects / debian / gnuradio / commitdiff