3 # Copyright 2005, 2006, 2007 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 3, 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, blks2
24 from gnuradio import eng_notation
29 # /////////////////////////////////////////////////////////////////////////////
31 # /////////////////////////////////////////////////////////////////////////////
33 class transmit_path(gr.hier_block2):
34 def __init__(self, modulator_class, options):
36 See below for what options should hold
38 gr.hier_block2.__init__(self, "transmit_path",
39 gr.io_signature(0, 0, 0), # Input signature
40 gr.io_signature(1, 1, gr.sizeof_gr_complex)) # Output signature
42 options = copy.copy(options) # make a copy so we can destructively modify
44 self._verbose = options.verbose
45 self._tx_amplitude = options.tx_amplitude # digital amplitude sent to USRP
46 self._bitrate = options.bitrate # desired bit rate
47 self._samples_per_symbol = options.samples_per_symbol # desired samples/baud
49 self._modulator_class = modulator_class # the modulator_class we are using
52 mod_kwargs = self._modulator_class.extract_kwargs_from_options(options)
55 modulator = self._modulator_class(**mod_kwargs)
56 self.packet_transmitter = \
57 blks2.mod_pkts(modulator,
62 self.amp = gr.multiply_const_cc(1)
63 self.set_tx_amplitude(self._tx_amplitude)
65 # Display some information about the setup
69 # Connect components in the flowgraph
70 self.connect(self.packet_transmitter, self.amp, self)
72 def set_tx_amplitude(self, ampl):
74 Sets the transmit amplitude sent to the USRP in volts
75 @param: ampl 0 <= ampl < 1.
77 self._tx_amplitude = max(0.0, min(ampl, 1))
78 self.amp.set_k(self._tx_amplitude)
80 def send_pkt(self, payload='', eof=False):
82 Calls the transmitter method to send a packet
84 return self.packet_transmitter.send_pkt(payload, eof)
89 def samples_per_symbol(self):
90 return self._samples_per_symbol
92 def add_options(normal, expert):
94 Adds transmitter-specific options to the Options Parser
96 if not normal.has_option('--bitrate'):
97 normal.add_option("-r", "--bitrate", type="eng_float", default=100e3,
98 help="specify bitrate [default=%default].")
99 normal.add_option("", "--tx-amplitude", type="eng_float", default=0.250, metavar="AMPL",
100 help="set transmitter digital amplitude: 0 <= AMPL < 1 [default=%default]")
101 normal.add_option("-v", "--verbose", action="store_true", default=False)
103 expert.add_option("-S", "--samples-per-symbol", type="float", default=None,
104 help="set samples/symbol [default=%default]")
105 expert.add_option("", "--log", action="store_true", default=False,
106 help="Log all parts of flow graph to file (CAUTION: lots of data)")
108 # Make a static method to call before instantiation
109 add_options = staticmethod(add_options)
111 def _print_verbage(self):
113 Prints information about the transmit path
115 print "Tx amplitude %s" % (self._tx_amplitude)
116 print "modulation: %s" % (self._modulator_class.__name__)
117 print "bitrate: %sb/s" % (eng_notation.num_to_str(self._bitrate))
118 print "samples/symbol: %.4f" % (self._samples_per_symbol)