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#!/usr/bin/env python
#
# Copyright 2008,2011 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, eng_notation
from gnuradio.eng_option import eng_option
from optparse import OptionParser
import sys
from gnuradio import digital
# from current dir
from uhd_interface import uhd_transmitter
n2s = eng_notation.num_to_str
class bert_transmit(gr.hier_block2):
def __init__(self, constellation, samples_per_symbol,
differential, excess_bw, gray_coded,
verbose, log):
gr.hier_block2.__init__(self, "bert_transmit",
gr.io_signature(0, 0, 0), # Output signature
gr.io_signature(1, 1, gr.sizeof_gr_complex)) # Input signature
# Create BERT data bit stream
self._bits = gr.vector_source_b([1,], True) # Infinite stream of ones
self._scrambler = gr.scrambler_bb(0x8A, 0x7F, 7) # CCSDS 7-bit scrambler
self._mod = digital.generic_mod(constellation, samples_per_symbol,
differential, excess_bw, gray_coded,
verbose, log)
self._pack = gr.unpacked_to_packed_bb(self._mod.bits_per_symbol(), gr.GR_MSB_FIRST)
self.connect(self._bits, self._scrambler, self._pack, self._mod, self)
class tx_psk_block(gr.top_block):
def __init__(self, mod, options):
gr.top_block.__init__(self, "tx_mpsk")
self._modulator_class = mod
# Get mod_kwargs
mod_kwargs = self._modulator_class.extract_kwargs_from_options(options)
# transmitter
self._modulator = self._modulator_class(**mod_kwargs)
if(options.tx_freq is not None):
self._sink = uhd_transmitter(options.address, options.bitrate,
options.samples_per_symbol,
options.tx_freq, options.tx_gain,
options.antenna, options.verbose)
options.samples_per_symbol = self._sink._sps
elif(options.to_file is not None):
self._sink = gr.file_sink(gr.sizeof_gr_complex, options.to_file)
else:
self._sink = gr.null_sink(gr.sizeof_gr_complex)
self._transmitter = bert_transmit(self._modulator._constellation,
options.samples_per_symbol,
options.differential,
options.excess_bw,
gray_coded=True,
verbose=options.verbose,
log=options.log)
self.connect(self._transmitter, self._sink)
def get_options(mods):
parser = OptionParser(option_class=eng_option, conflict_handler="resolve")
parser.add_option("-m", "--modulation", type="choice", choices=mods.keys(),
default='psk',
help="Select modulation from: %s [default=%%default]"
% (', '.join(mods.keys()),))
parser.add_option("", "--amplitude", type="eng_float", default=0.2,
help="set Tx amplitude (0-1) (default=%default)")
parser.add_option("-r", "--bitrate", type="eng_float", default=250e3,
help="Select modulation bit rate (default=%default)")
parser.add_option("-S", "--samples-per-symbol", type="float", default=2,
help="set samples/symbol [default=%default]")
parser.add_option("","--to-file", default=None,
help="Output file for modulated samples")
if not parser.has_option("--verbose"):
parser.add_option("-v", "--verbose", action="store_true", default=False)
if not parser.has_option("--log"):
parser.add_option("", "--log", action="store_true", default=False)
uhd_transmitter.add_options(parser)
for mod in mods.values():
mod.add_options(parser)
(options, args) = parser.parse_args()
if len(args) != 0:
parser.print_help()
sys.exit(1)
return (options, args)
if __name__ == "__main__":
mods = digital.modulation_utils.type_1_mods()
(options, args) = get_options(mods)
mod = mods[options.modulation]
tb = tx_psk_block(mod, options)
try:
tb.run()
except KeyboardInterrupt:
pass
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