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#
# Copyright 2005,2006,2011 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.
#
"""
QPSK modulation.
Demodulation is not included since the generic_mod_demod
"""
from __future__ import absolute_import
from __future__ import unicode_literals
from gnuradio import gr
from gnuradio.digital.generic_mod_demod import generic_mod, generic_demod
from gnuradio.digital.generic_mod_demod import shared_mod_args, shared_demod_args
from .utils import mod_codes
from . import digital_swig as digital
from . import modulation_utils
# The default encoding (e.g. gray-code, set-partition)
_def_mod_code = mod_codes.GRAY_CODE
# /////////////////////////////////////////////////////////////////////////////
# QPSK constellation
# /////////////////////////////////////////////////////////////////////////////
def qpsk_constellation(mod_code=_def_mod_code):
"""
Creates a QPSK constellation.
"""
if mod_code != mod_codes.GRAY_CODE:
raise ValueError("This QPSK mod/demod works only for gray-coded constellations.")
return digital.constellation_qpsk()
# /////////////////////////////////////////////////////////////////////////////
# DQPSK constellation
# /////////////////////////////////////////////////////////////////////////////
def dqpsk_constellation(mod_code=_def_mod_code):
if mod_code != mod_codes.GRAY_CODE:
raise ValueError("The DQPSK constellation is only generated for gray_coding. But it can be used for non-grayed coded modulation if one doesn't use the pre-differential code.")
return digital.constellation_dqpsk()
#
# Add these to the mod/demod registry
#
modulation_utils.add_type_1_constellation('qpsk', qpsk_constellation)
modulation_utils.add_type_1_constellation('dqpsk', dqpsk_constellation)
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