1 /* -*- c++ -*- */
2 /*
3 * Copyright 2002,2013,2018 Free Software Foundation, Inc.
4 *
5 * This file is part of GNU Radio
6 *
7 * GNU Radio is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 3, or (at your option)
10 * any later version.
11 *
12 * GNU Radio is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with GNU Radio; see the file COPYING. If not, write to
19 * the Free Software Foundation, Inc., 51 Franklin Street,
20 * Boston, MA 02110-1301, USA.
21 */
22
23 #ifdef HAVE_CONFIG_H
24 #include <config.h>
25 #endif
26
27 #include <gnuradio/attributes.h>
28 #include <gnuradio/blocks/rotator.h>
29 #include <gnuradio/expj.h>
30 #include <gnuradio/math.h>
31 #include <boost/test/unit_test.hpp>
32
33 #include <cmath>
34
35 // error vector magnitude
error_vector_mag(gr_complex a,gr_complex b)36 __GR_ATTR_UNUSED static float error_vector_mag(gr_complex a, gr_complex b)
37 {
38 return abs(a - b);
39 }
40
BOOST_AUTO_TEST_CASE(t1)41 BOOST_AUTO_TEST_CASE(t1)
42 {
43 static const unsigned int N = 100000;
44
45 gr::blocks::rotator r;
46
47 double phase_incr = 2 * GR_M_PI / 1003;
48 double phase = 0;
49
50 // Old code: We increment then return the rotated value, thus we
51 // need to start one tick back r.set_phase(gr_complex(1,0) *
52 // conj(gr_expj(phase_incr)));
53
54 r.set_phase(gr_complex(1, 0));
55 r.set_phase_incr(gr_expj(phase_incr));
56
57 for (unsigned i = 0; i < N; i++) {
58 gr_complex expected = gr_expj(phase);
59 gr_complex actual = r.rotate(gr_complex(1, 0));
60
61 BOOST_CHECK(std::abs(expected - actual) <= 0.0001);
62
63 phase += phase_incr;
64 if (phase >= 2 * GR_M_PI)
65 phase -= 2 * GR_M_PI;
66 }
67 }
68
BOOST_AUTO_TEST_CASE(t2)69 BOOST_AUTO_TEST_CASE(t2)
70 {
71 static const unsigned int N = 100000;
72
73 gr::blocks::rotator r;
74 gr_complex* input = new gr_complex[N];
75 gr_complex* output = new gr_complex[N];
76
77 double phase_incr = 2 * GR_M_PI / 1003;
78 double phase = 0;
79
80 r.set_phase(gr_complex(1, 0));
81 r.set_phase_incr(gr_expj(phase_incr));
82
83 // Generate a unity sequence
84 for (unsigned i = 0; i < N; i++)
85 input[i] = gr_complex(1.0f, 0.0f);
86
87 // Rotate it
88 r.rotateN(output, input, N);
89
90 // Compare with expected result
91 for (unsigned i = 0; i < N; i++) {
92 gr_complex expected = gr_expj(phase);
93 gr_complex actual = output[i];
94
95 BOOST_CHECK(std::abs(expected - actual) <= 0.0001);
96
97 phase += phase_incr;
98 if (phase >= 2 * GR_M_PI)
99 phase -= 2 * GR_M_PI;
100 }
101
102 delete[] output;
103 delete[] input;
104 }
105