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# Copyright 2013 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.
#
"""
This file contains constellations that are similar to QAM, but are not perfect squares.
"""
import digital_swig
from qam import large_ampls_to_corners_mapping
def qam32_holeinside_constellation(large_ampls_to_corners=False):
# First make constellation for one quadrant.
# 0 1 2
# 2 - 010 111 110
# 1 - 011 101 100
# 0 - 000 001
# Have put hole in the side rather than corner.
# Corner point is helpful for frequency locking.
# It has an attempt at some gray-coding, but not
# a very good one.
# Indices are (horizontal, vertical).
indices_and_numbers = (
((0, 0), 0b000),
((0, 1), 0b011),
((0, 2), 0b010),
((1, 0), 0b001),
((1, 1), 0b101),
((1, 2), 0b111),
((2, 1), 0b100),
((2, 2), 0b110),
)
points = [None]*32
for indices, number in indices_and_numbers:
p_in_quadrant = 0.5+indices[0] + 1j*(0.5+indices[1])
for quadrant in range(4):
index = number + 8 * quadrant
rotation = pow(1j, quadrant)
p = p_in_quadrant * rotation
points[index] = p
side = 6
width = 1
# Double number of boxes on side
# This is so that points in the 'hole' get assigned correctly.
side = 12
width = 0.5
pre_diff_code = []
if not large_ampls_to_corners:
constellation = digital_swig.constellation_rect(points, pre_diff_code, 4,
side, side, width, width)
else:
sector_values = large_ampls_to_corners_mapping(side, points, width)
constellation = digital_swig.constellation_expl_rect(
points, pre_diff_code, 4, side, side, width, width, sector_values)
return constellation
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