diff options
| author | Ben Reynwar <ben@reynwar.net> | 2011-01-20 14:21:07 -0700 |
|---|---|---|
| committer | Ben Reynwar <ben@reynwar.net> | 2011-01-20 14:21:07 -0700 |
| commit | c23d8a22a8b7859e83d95bd0b439229876c2d5b0 (patch) | |
| tree | 1ce54260e2998bbfa6dc650205f8577732254dc7 /gnuradio-core/src/python/gnuradio/blks2impl/psk2.py | |
| parent | 1ec42d6fa313c6d3eeefae783a74a8600da3b76e (diff) | |
Added support for PSK to generic modulation.
Diffstat (limited to 'gnuradio-core/src/python/gnuradio/blks2impl/psk2.py')
| -rw-r--r-- | gnuradio-core/src/python/gnuradio/blks2impl/psk2.py | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/gnuradio-core/src/python/gnuradio/blks2impl/psk2.py b/gnuradio-core/src/python/gnuradio/blks2impl/psk2.py new file mode 100644 index 0000000000..4fd2c77fec --- /dev/null +++ b/gnuradio-core/src/python/gnuradio/blks2impl/psk2.py @@ -0,0 +1,100 @@ +# +# Copyright 2005,2006 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. +# + +""" +PSK modulation and demodulation. +""" + +from math import pi, log +from cmath import exp + +from gnuradio import gr, modulation_utils2 +from gnuradio.blks2impl.generic_mod_demod import generic_mod, generic_demod + +# Default number of points in constellation. +_def_constellation_points = 4 +# Whether differential coding is used. +_def_differential = True + +# ///////////////////////////////////////////////////////////////////////////// +# PSK constellation +# ///////////////////////////////////////////////////////////////////////////// + +def psk_constellation(m=_def_constellation_points): + """ + Creates a PSK constellation object. + """ + k = log(m) / log(2.0) + if (k != int(k)): + raise StandardError('Number of constellation points must be a power of two.') + points = [exp(2*pi*(0+1j)*i/m) for i in range(0,m)] + constellation = gr.constellation_psk(points, m) + return constellation + +# ///////////////////////////////////////////////////////////////////////////// +# PSK modulator +# ///////////////////////////////////////////////////////////////////////////// + +class psk_mod(generic_mod): + + def __init__(self, constellation_points=_def_constellation_points, + *args, **kwargs): + + """ + Hierarchical block for RRC-filtered PSK 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 = psk_constellation(constellation_points) + super(psk_mod, self).__init__(constellation, *args, **kwargs) + +# ///////////////////////////////////////////////////////////////////////////// +# PSK demodulator +# +# ///////////////////////////////////////////////////////////////////////////// + +class psk_demod(generic_demod): + + def __init__(self, constellation_points=_def_constellation_points, + *args, **kwargs): + + """ + Hierarchical block for RRC-filtered PSK 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 = psk_constellation(constellation_points) + super(psk_demod, self).__init__(constellation, *args, **kwargs) + +# +# Add these to the mod/demod registry +# +modulation_utils2.add_type_1_mod('psk', psk_mod) +modulation_utils2.add_type_1_demod('psk', psk_demod) +modulation_utils2.add_type_1_constellation('psk', psk_constellation) |