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#!/usr/bin/env python
#
# 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.
#
import numpy, pylab, sys
from gnuradio import digital
from soft_dec_lut_gen import *
from psk_constellations import *
from qam_constellations import *
def test_qpsk(i, sample, prec):
qpsk_const_list = [psk_4_0, psk_4_1, psk_4_2, psk_4_3,
psk_4_4, psk_4_5, psk_4_6, psk_4_7]
qpsk_lut_gen_list = [sd_psk_4_0, sd_psk_4_1, sd_psk_4_2, sd_psk_4_3,
sd_psk_4_4, sd_psk_4_5, sd_psk_4_6, sd_psk_4_7]
constel, code = qpsk_const_list[i]()
qpsk_lut_gen = qpsk_lut_gen_list[i]
rot_sym = 1
side = 2
width = 2
c = digital.constellation_rect(constel, code, rot_sym,
side, side, width, width)
# Get max energy/symbol in constellation
constel = c.points()
Es = max([numpy.sqrt(constel_i.real**2 + constel_i.imag**2) for constel_i in constel])
#table = soft_dec_table_generator(qpsk_lut_gen, prec, Es)
table = soft_dec_table(constel, code, prec)
c.gen_soft_dec_lut(prec)
#c.set_soft_dec_lut(table, prec)
y_python_gen_calc = qpsk_lut_gen(sample, Es)
y_python_table = calc_soft_dec_from_table(sample, table, prec, Es)
y_python_raw_calc = calc_soft_dec(sample, constel, code)
y_cpp_table = c.soft_decision_maker(sample)
y_cpp_raw_calc = c.calc_soft_dec(sample)
return (y_python_gen_calc, y_python_table, y_python_raw_calc,
y_cpp_table, y_cpp_raw_calc, constel, code, c)
def test_qam16(i, sample, prec):
sample = sample/1
qam_const_list = [qam_16_0, ]
qam_lut_gen_list = [sd_qam_16_0, ]
constel, code = qam_const_list[i]()
qam_lut_gen = qam_lut_gen_list[i]
rot_sym = 4
side = 2
width = 2
c = digital.constellation_rect(constel, code, rot_sym,
side, side, width, width)
# Get max energy/symbol in constellation
constel = c.points()
Es = max([abs(constel_i) for constel_i in constel])
#table = soft_dec_table_generator(qam_lut_gen, prec, Es)
table = soft_dec_table(constel, code, prec, 1)
#c.gen_soft_dec_lut(prec)
c.set_soft_dec_lut(table, prec)
y_python_gen_calc = qam_lut_gen(sample, Es)
y_python_table = calc_soft_dec_from_table(sample, table, prec, Es)
y_python_raw_calc = calc_soft_dec(sample, constel, code, 1)
y_cpp_table = c.soft_decision_maker(sample)
y_cpp_raw_calc = c.calc_soft_dec(sample)
return (y_python_gen_calc, y_python_table, y_python_raw_calc,
y_cpp_table, y_cpp_raw_calc, constel, code, c)
if __name__ == "__main__":
index = 0
prec = 8
x_re = 2*numpy.random.random()-1
x_im = 2*numpy.random.random()-1
x = x_re + x_im*1j
#x = -1 + -0.j
if 1:
y_python_gen_calc, y_python_table, y_python_raw_calc, \
y_cpp_table, y_cpp_raw_calc, constel, code, c \
= test_qpsk(index, x, prec)
else:
y_python_gen_calc, y_python_table, y_python_raw_calc, \
y_cpp_table, y_cpp_raw_calc, constel, code, c \
= test_qam16(index, x, prec)
k = numpy.log2(len(constel))
print "Sample: ", x
print "Python Generator Calculated: ", (y_python_gen_calc)
print "Python Generator Table: ", (y_python_table)
print "Python Raw calc: ", (y_python_raw_calc)
print "C++ Table calc: ", (y_cpp_table)
print "C++ Raw calc: ", (y_cpp_raw_calc)
fig = pylab.figure(1)
sp1 = fig.add_subplot(1,1,1)
sp1.plot([c.real for c in constel],
[c.imag for c in constel], 'bo')
sp1.plot(x.real, x.imag, 'ro')
sp1.set_xlim([-1.5, 1.5])
sp1.set_ylim([-1.5, 1.5])
fill = int(numpy.log2(len(constel)))
for i,c in enumerate(constel):
sp1.text(1.2*c.real, 1.2*c.imag, bin(code[i])[2:].zfill(fill),
ha='center', va='center', size=18)
pylab.show()
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