3 # Copyright 2005,2006 Free Software Foundation, Inc.
5 # This file is part of GNU Radio
7 # GNU Radio is free software; you can redistribute it and/or modify
8 # it under the terms of the GNU General Public License as published by
9 # the Free Software Foundation; either version 2, or (at your option)
12 # GNU Radio is distributed in the hope that it will be useful,
13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 # GNU General Public License for more details.
17 # You should have received a copy of the GNU General Public License
18 # along with GNU Radio; see the file COPYING. If not, write to
19 # the Free Software Foundation, Inc., 51 Franklin Street,
20 # Boston, MA 02110-1301, USA.
23 from gnuradio import gr, gru, blks
24 from gnuradio import usrp
25 from gnuradio import eng_notation
30 from pick_bitrate import pick_rx_bitrate
32 # /////////////////////////////////////////////////////////////////////////////
34 # /////////////////////////////////////////////////////////////////////////////
36 class receive_path(gr.hier_block):
37 def __init__(self, fg, rx_callback, options):
39 options = copy.copy(options) # make a copy so we can destructively modify
41 self._verbose = options.verbose
42 self._log = options.log
43 self._rx_callback = rx_callback # this callback is fired when there's a packet available
46 self.ofdm_receiver = \
47 blks.demod_ofdm_pkts(fg, options,
48 callback=self._rx_callback)
50 # Carrier Sensing Blocks
52 #thresh = 30 # in dB, will have to adjust
53 #self.probe = gr.probe_avg_mag_sqrd_c(thresh,alpha)
54 #fg.connect(self.chan_filt, self.probe)
56 # Display some information about the setup
60 gr.hier_block.__init__(self, fg, self.ofdm_receiver, None)
62 def carrier_sensed(self):
64 Return True if we think carrier is present.
66 #return self.probe.level() > X
67 return self.probe.unmuted()
69 def carrier_threshold(self):
71 Return current setting in dB.
73 return self.probe.threshold()
75 def set_carrier_threshold(self, threshold_in_db):
77 Set carrier threshold.
79 @param threshold_in_db: set detection threshold
80 @type threshold_in_db: float (dB)
82 self.probe.set_threshold(threshold_in_db)
85 def add_options(normal, expert):
87 Adds receiver-specific options to the Options Parser
89 normal.add_option("-v", "--verbose", action="store_true", default=False)
90 expert.add_option("", "--log", action="store_true", default=False,
91 help="Log all parts of flow graph to files (CAUTION: lots of data)")
93 # Make a static method to call before instantiation
94 add_options = staticmethod(add_options)
97 def _print_verbage(self):
99 Prints information about the receive path
101 print "Using RX d'board %s" % (self.subdev.side_and_name(),)
102 print "Rx gain: %g" % (self.gain,)
103 print "modulation: %s" % (self._demod_class.__name__)
104 print "bitrate: %sb/s" % (eng_notation.num_to_str(self._bitrate))
105 print "samples/symbol: %3d" % (self._samples_per_symbol)
106 print "decim: %3d" % (self._decim)