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Diffstat (limited to 'gr-digital/python/qpsk.py')
| -rw-r--r-- | gr-digital/python/qpsk.py | 176 |
1 files changed, 176 insertions, 0 deletions
diff --git a/gr-digital/python/qpsk.py b/gr-digital/python/qpsk.py new file mode 100644 index 000000000..481b7cb5b --- /dev/null +++ b/gr-digital/python/qpsk.py @@ -0,0 +1,176 @@ +# +# 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 gnuradio import gr +from gnuradio.digital.generic_mod_demod import generic_mod, generic_demod +import digital_swig +import modulation_utils2 + +# Default number of points in constellation. +_def_constellation_points = 4 +# Whether gray coding is used. +_def_gray_coded = True + +# ///////////////////////////////////////////////////////////////////////////// +# QPSK constellation +# ///////////////////////////////////////////////////////////////////////////// + +def qpsk_constellation(m=_def_constellation_points): + if m != _def_constellation_points: + raise ValueError("QPSK can only have 4 constellation points.") + return digital_swig.constellation_qpsk() + +# ///////////////////////////////////////////////////////////////////////////// +# QPSK modulator +# ///////////////////////////////////////////////////////////////////////////// + +class qpsk_mod(generic_mod): + + def __init__(self, constellation_points=_def_constellation_points, + gray_coded=_def_gray_coded, + *args, **kwargs): + + """ + Hierarchical block for RRC-filtered QPSK modulation. + + The input is a byte stream (unsigned char) and the + output is the complex modulated signal at baseband. + + See generic_mod block for list of parameters. + """ + + constellation_points = _def_constellation_points + constellation = digital_swig.constellation_qpsk() + if constellation_points != 4: + raise ValueError("QPSK can only have 4 constellation points.") + if not gray_coded: + raise ValueError("This QPSK mod/demod works only for gray-coded constellations.") + super(qpsk_mod, self).__init__(constellation=constellation, + gray_coded=gray_coded, + *args, **kwargs) + + +# ///////////////////////////////////////////////////////////////////////////// +# QPSK demodulator +# +# ///////////////////////////////////////////////////////////////////////////// + +class qpsk_demod(generic_demod): + + def __init__(self, constellation_points=_def_constellation_points, + *args, **kwargs): + + """ + Hierarchical block for RRC-filtered QPSK modulation. + + The input is a byte stream (unsigned char) and the + output is the complex modulated signal at baseband. + + See generic_demod block for list of parameters. + """ + + constellation_points = _def_constellation_points + constellation = digital_swig.constellation_qpsk() + if constellation_points != 4: + raise ValueError('Number of constellation points must be 4 for QPSK.') + super(qpsk_demod, self).__init__(constellation=constellation, + *args, **kwargs) + + + +# ///////////////////////////////////////////////////////////////////////////// +# DQPSK constellation +# ///////////////////////////////////////////////////////////////////////////// + +def dqpsk_constellation(m=_def_constellation_points): + if m != _def_constellation_points: + raise ValueError("DQPSK can only have 4 constellation points.") + return digital_swig.constellation_dqpsk() + +# ///////////////////////////////////////////////////////////////////////////// +# DQPSK modulator +# ///////////////////////////////////////////////////////////////////////////// + +class dqpsk_mod(generic_mod): + + def __init__(self, constellation_points=_def_constellation_points, + gray_coded=_def_gray_coded, + differential=True, *args, **kwargs): + """ + Hierarchical block for RRC-filtered DQPSK modulation. + + The input is a byte stream (unsigned char) and the + output is the complex modulated signal at baseband. + + See generic_mod block for list of parameters. + """ + + constellation_points = _def_constellation_points + constellation = digital_swig.constellation_dqpsk() + if constellation_points != 4: + raise ValueError('Number of constellation points must be 4 for DQPSK.') + super(dqpsk_mod, self).__init__(constellation=constellation, + gray_coded=gray_coded, + differential=True, + *args, **kwargs) + +# ///////////////////////////////////////////////////////////////////////////// +# DQPSK demodulator +# +# ///////////////////////////////////////////////////////////////////////////// + +class dqpsk_demod(generic_demod): + + def __init__(self, constellation_points=_def_constellation_points, + differential=True, *args, **kwargs): + + """ + Hierarchical block for RRC-filtered DQPSK modulation. + + The input is a byte stream (unsigned char) and the + output is the complex modulated signal at baseband. + + See generic_demod block for list of parameters. + """ + constellation_points = _def_constellation_points + constellation = digital_swig.constellation_dqpsk() + if constellation_points != 4: + raise ValueError('Number of constellation points must be 4 for DQPSK.') + super(dqpsk_demod, self).__init__(constellation=constellation, + differential=True, + *args, **kwargs) + +# +# Add these to the mod/demod registry +# +modulation_utils2.add_type_1_mod('qpsk', qpsk_mod) +modulation_utils2.add_type_1_demod('qpsk', qpsk_demod) +modulation_utils2.add_type_1_constellation('qpsk', qpsk_constellation) +modulation_utils2.add_type_1_mod('dqpsk', dqpsk_mod) +modulation_utils2.add_type_1_demod('dqpsk', dqpsk_demod) +modulation_utils2.add_type_1_constellation('dqpsk', dqpsk_constellation) + |