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#!/usr/bin/env python
#
# Copyright 2013 Free Software Foundation, Inc.
#
# This file is part of GNU Radio
#
# SPDX-License-Identifier: GPL-3.0-or-later
#
#
def constellation_map_generator(basis_cpoints, basis_symbols, k, pi):
'''
Uses the a basis constellation provided (e.g., from
psk_constellation.psk_4()) and the the k and permutation index
(pi) to generate a new Gray-coded symbol map to the constellation
points provided in the basis.
The basis_cpoints are the constellation points of the basis
constellation, and basis_symbols are the symbols that correspond
to the constellation points.
The selection of k and pi will provide an automorphism the
hyperoctahedral group of the basis constellation.
This function returns a tuple of (constellation_points,
symbol_map). The constellation_points is a list of the
constellation points in complex space and the symbol_map is a list
of the log2(M)-bit symbols for the constellation points (i.e.,
symbol_map[i] are the bits associated with
constellation_points[i]).
'''
#const_points, s = basis()
const_points = basis_cpoints
s = basis_symbols
symbols = list()
for s_i in s:
tmp = 0
for i,p in enumerate(pi):
bit = (s_i >> i) & 0x1
tmp |= bit << p
symbols.append(tmp ^ k)
return (const_points, symbols)
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