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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.
#
"""
BPSK modulation and demodulation.
"""
from math import pi, log
from cmath import exp
from gnuradio import gr, modulation_utils2
from gnuradio.digital.generic_mod_demod import generic_mod, generic_demod
# Default number of points in constellation.
_def_constellation_points = 2
# Whether differential coding is used.
_def_differential = True
# /////////////////////////////////////////////////////////////////////////////
# BPSK constellation
# /////////////////////////////////////////////////////////////////////////////
def bpsk_constellation(m=_def_constellation_points):
if m != _def_constellation_points:
raise ValueError("BPSK can only have 2 constellation points.")
return gr.constellation_bpsk()
# /////////////////////////////////////////////////////////////////////////////
# BPSK modulator
# /////////////////////////////////////////////////////////////////////////////
class bpsk_mod(generic_mod):
def __init__(self, constellation_points=_def_constellation_points,
*args, **kwargs):
"""
Hierarchical block for RRC-filtered BPSK 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 = gr.constellation_bpsk()
if constellation_points != 2:
raise ValueError('Number of constellation points must be 2 for BPSK.')
super(bpsk_mod, self).__init__(constellation, *args, **kwargs)
# /////////////////////////////////////////////////////////////////////////////
# BPSK demodulator
#
# /////////////////////////////////////////////////////////////////////////////
class bpsk_demod(generic_demod):
def __init__(self, constellation_points=_def_constellation_points,
*args, **kwargs):
"""
Hierarchical block for RRC-filtered BPSK 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 = gr.constellation_bpsk()
if constellation_points != 2:
raise ValueError('Number of constellation points must be 2 for BPSK.')
super(bpsk_demod, self).__init__(constellation, *args, **kwargs)
#
# Add these to the mod/demod registry
#
modulation_utils2.add_type_1_mod('bpsk', bpsk_mod)
modulation_utils2.add_type_1_demod('bpsk', bpsk_demod)
modulation_utils2.add_type_1_constellation('bpsk', bpsk_constellation)
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