1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
|
/* -*- c++ -*- */
/*
* Copyright 2006,2010-2012 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* SPDX-License-Identifier: GPL-3.0-or-later
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "costas_loop_cc_impl.h"
#include <gnuradio/expj.h>
#include <gnuradio/io_signature.h>
#include <gnuradio/math.h>
#include <gnuradio/sincos.h>
namespace gr {
namespace digital {
costas_loop_cc::sptr costas_loop_cc::make(float loop_bw, unsigned int order, bool use_snr)
{
return gnuradio::make_block_sptr<costas_loop_cc_impl>(loop_bw, order, use_snr);
}
static int ios[] = { sizeof(gr_complex), sizeof(float), sizeof(float), sizeof(float) };
static std::vector<int> iosig(ios, ios + sizeof(ios) / sizeof(int));
costas_loop_cc_impl::costas_loop_cc_impl(float loop_bw, unsigned int order, bool use_snr)
: sync_block("costas_loop_cc",
io_signature::make(1, 1, sizeof(gr_complex)),
io_signature::makev(1, 4, iosig)),
blocks::control_loop(loop_bw, 1.0, -1.0),
d_error(0),
d_noise(1.0),
d_use_snr(use_snr),
d_order(order)
{
message_port_register_in(pmt::mp("noise"));
set_msg_handler(pmt::mp("noise"),
[this](pmt::pmt_t msg) { this->handle_set_noise(msg); });
}
costas_loop_cc_impl::~costas_loop_cc_impl() {}
void costas_loop_cc_impl::handle_set_noise(pmt::pmt_t msg)
{
if (pmt::is_real(msg)) {
d_noise = pmt::to_double(msg);
d_noise = powf(10.0f, d_noise / 10.0f);
}
}
int costas_loop_cc_impl::work(int noutput_items,
gr_vector_const_void_star& input_items,
gr_vector_void_star& output_items)
{
const gr_complex* iptr = (gr_complex*)input_items[0];
gr_complex* optr = (gr_complex*)output_items[0];
float* freq_optr = output_items.size() >= 2 ? (float*)output_items[1] : NULL;
float* phase_optr = output_items.size() >= 3 ? (float*)output_items[2] : NULL;
float* error_optr = output_items.size() >= 4 ? (float*)output_items[3] : NULL;
std::vector<tag_t> tags;
get_tags_in_range(tags,
0,
nitems_read(0),
nitems_read(0) + noutput_items,
pmt::intern("phase_est"));
// Get this out of the for loop if not used:
bool has_additional_outputs = false;
if (freq_optr)
has_additional_outputs = true;
else if (phase_optr)
has_additional_outputs = true;
else if (error_optr)
has_additional_outputs = true;
for (int i = 0; i < noutput_items; i++) {
if (!tags.empty()) {
if (tags[0].offset - nitems_read(0) == (size_t)i) {
d_phase = (float)pmt::to_double(tags[0].value);
tags.erase(tags.begin());
}
}
const gr_complex nco_out = gr_expj(-d_phase);
gr::fast_cc_multiply(optr[i], iptr[i], nco_out);
// EXPENSIVE LINE with function pointer, switch was about 20% faster in testing.
// Left in for logic justification/reference. d_error = phase_detector_2(optr[i]);
switch (d_order) {
case 2:
if (d_use_snr)
d_error = phase_detector_snr_2(optr[i]);
else
d_error = phase_detector_2(optr[i]);
break;
case 4:
if (d_use_snr)
d_error = phase_detector_snr_4(optr[i]);
else
d_error = phase_detector_4(optr[i]);
break;
case 8:
if (d_use_snr)
d_error = phase_detector_snr_8(optr[i]);
else
d_error = phase_detector_8(optr[i]);
break;
}
d_error = gr::branchless_clip(d_error, 1.0);
advance_loop(d_error);
phase_wrap();
frequency_limit();
if (has_additional_outputs) {
if (freq_optr)
freq_optr[i] = d_freq;
if (phase_optr)
phase_optr[i] = d_phase;
if (error_optr)
error_optr[i] = d_error;
}
}
return noutput_items;
}
void costas_loop_cc_impl::setup_rpc()
{
#ifdef GR_CTRLPORT
// Getters
add_rpc_variable(rpcbasic_sptr(
new rpcbasic_register_get<costas_loop_cc, float>(alias(),
"error",
&costas_loop_cc::error,
pmt::mp(-2.0f),
pmt::mp(2.0f),
pmt::mp(0.0f),
"",
"Error signal of loop",
RPC_PRIVLVL_MIN,
DISPTIME | DISPOPTSTRIP)));
add_rpc_variable(rpcbasic_sptr(
new rpcbasic_register_get<control_loop, float>(alias(),
"frequency",
&control_loop::get_frequency,
pmt::mp(0.0f),
pmt::mp(2.0f),
pmt::mp(0.0f),
"",
"Frequency Est.",
RPC_PRIVLVL_MIN,
DISPTIME | DISPOPTSTRIP)));
add_rpc_variable(rpcbasic_sptr(
new rpcbasic_register_get<control_loop, float>(alias(),
"phase",
&control_loop::get_phase,
pmt::mp(0.0f),
pmt::mp(2.0f),
pmt::mp(0.0f),
"",
"Phase Est.",
RPC_PRIVLVL_MIN,
DISPTIME | DISPOPTSTRIP)));
add_rpc_variable(rpcbasic_sptr(
new rpcbasic_register_get<control_loop, float>(alias(),
"loop_bw",
&control_loop::get_loop_bandwidth,
pmt::mp(0.0f),
pmt::mp(2.0f),
pmt::mp(0.0f),
"",
"Loop bandwidth",
RPC_PRIVLVL_MIN,
DISPTIME | DISPOPTSTRIP)));
// Setters
add_rpc_variable(rpcbasic_sptr(
new rpcbasic_register_set<control_loop, float>(alias(),
"loop_bw",
&control_loop::set_loop_bandwidth,
pmt::mp(0.0f),
pmt::mp(1.0f),
pmt::mp(0.0f),
"",
"Loop bandwidth",
RPC_PRIVLVL_MIN,
DISPNULL)));
#endif /* GR_CTRLPORT */
}
} /* namespace digital */
} /* namespace gr */
|
