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/* -*- c++ -*- */
/*
* Copyright 2002,2013 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.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <gnuradio/attributes.h>
#include <cppunit/TestAssert.h>
#include <qa_rotator.h>
#include <gnuradio/blocks/rotator.h>
#include <stdio.h>
#include <cmath>
#include <gnuradio/expj.h>
// error vector magnitude
__GR_ATTR_UNUSED static float
error_vector_mag(gr_complex a, gr_complex b)
{
return abs(a-b);
}
void
qa_rotator::t1()
{
static const unsigned int N = 100000;
gr::blocks::rotator r;
double phase_incr = 2*M_PI / 1003;
double phase = 0;
// Old code: We increment then return the rotated value, thus we
// need to start one tick back r.set_phase(gr_complex(1,0) *
// conj(gr_expj(phase_incr)));
r.set_phase(gr_complex(1,0));
r.set_phase_incr(gr_expj(phase_incr));
for(unsigned i = 0; i < N; i++) {
gr_complex expected = gr_expj(phase);
gr_complex actual = r.rotate(gr_complex(1, 0));
#if 0
float evm = error_vector_mag(expected, actual);
printf("[%6d] expected: (%8.6f, %8.6f) actual: (%8.6f, %8.6f) evm: %8.6f\n",
i, expected.real(), expected.imag(), actual.real(), actual.imag(), evm);
#endif
CPPUNIT_ASSERT_COMPLEXES_EQUAL(expected, actual, 0.0001);
phase += phase_incr;
if(phase >= 2*M_PI)
phase -= 2*M_PI;
}
}
void
qa_rotator::t2()
{
static const unsigned int N = 100000;
gr::blocks::rotator r;
gr_complex *input = new gr_complex[N];
gr_complex *output = new gr_complex[N];
double phase_incr = 2*M_PI / 1003;
double phase = 0;
r.set_phase(gr_complex(1,0));
r.set_phase_incr(gr_expj(phase_incr));
// Generate a unity sequence
for(unsigned i = 0; i < N; i++)
input[i] = gr_complex(1.0f, 0.0f);
// Rotate it
r.rotateN(output, input, N);
// Compare with expected result
for(unsigned i = 0; i < N; i++) {
gr_complex expected = gr_expj(phase);
gr_complex actual = output[i];
#if 0
float evm = error_vector_mag(expected, actual);
printf("[%6d] expected: (%8.6f, %8.6f) actual: (%8.6f, %8.6f) evm: %8.6f\n",
i, expected.real(), expected.imag(), actual.real(), actual.imag(), evm);
#endif
CPPUNIT_ASSERT_COMPLEXES_EQUAL(expected, actual, 0.0001);
phase += phase_incr;
if(phase >= 2*M_PI)
phase -= 2*M_PI;
}
delete[] output;
delete[] input;
}
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