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Code Issues Releases Wiki Activity

bug in phase correction fixed; code readability improved

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This commit is contained in:
cmayer 2018-10-27 11:36:27 +02:00
parent f73b7567d3
commit f8f841c46a
4 changed files with 82 additions and 62 deletions
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4
examples/test_cc.grc
View file

@ -207,7 +207,7 @@
</param>
<param>
<key>value</key>
<value>[[x,x,x,x,x] for x in STANAG_4285.PhysicalLayer.get_preamble()['symb'].tolist()]</value>
<value>[[x,x,x,x,x] for x in STANAG_4285.PhysicalLayer.get_preamble()['symb'][9:40].tolist()]</value>
</param>
</block>
<block>
@ -812,7 +812,7 @@
</param>
<param>
<key>mark_delay</key>
<value>nF+2</value>
<value>nF+2-9*sps</value>
</param>
<param>
<key>threshold_method</key>

133
lib/adaptive_dfe_impl.cc
View file

@ -23,9 +23,14 @@
#endif
#include <gnuradio/io_signature.h>
#include <gnuradio/expj.h>
#include <volk/volk.h>
#include "adaptive_dfe_impl.h"
#define VOLK_SAFE_DELETE(x) \
volk_free(x); \
x = nullptr
namespace gr {
namespace digitalhf {
@ -84,7 +89,6 @@ adaptive_dfe_impl::adaptive_dfe_impl(int sps, // samples per symbol
, _scramble()
, _descrambled_symbols()
, _symbol_counter(0)
, _sum_phase_diff(0)
, _df(0)
, _phase(0)
, _b{0.338187046465954, -0.288839024460507}
@ -98,6 +102,10 @@ adaptive_dfe_impl::adaptive_dfe_impl(int sps, // samples per symbol
*/
adaptive_dfe_impl::~adaptive_dfe_impl()
{
VOLK_SAFE_DELETE(_taps_samples);
VOLK_SAFE_DELETE(_taps_symbols);
VOLK_SAFE_DELETE(_hist_samples);
VOLK_SAFE_DELETE(_hist_symbols);
}
void
@ -120,43 +128,13 @@ adaptive_dfe_impl::general_work(int noutput_items,
int i = 0;
for (; i<ninput_items[0] && nout < noutput_items; ++i) {
assert(nout < noutput_items);
_phase += _df;
if (_phase > M_PI)
_phase -= 2*M_PI;
if (_phase < -M_PI)
_phase += 2*M_PI;
_hist_samples[_hist_sample_index] = _hist_samples[_hist_sample_index+_nB+_nF+1] = in[i] * std::exp(gr_complex(0,_phase));
if (++_hist_sample_index == _nB+_nF+1)
_hist_sample_index = 0;
insert_sample(in[i]);
if (_state == WAIT_FOR_PREAMBLE) {
std::vector<tag_t> v;
get_tags_in_window(v, 0, i,i+1);
float phase_est = 0;
float corr_est = 0;
uint64_t offset = 0;
for (int j=0; j<v.size(); ++j) {
std::cout << "tag " << v[j].key << " " << v[j].offset-nitems_read(0) << std::endl;
if (v[j].key == pmt::mp("phase_est")) {
phase_est = pmt::to_double(v[j].value);
std::cout << "phase_est " << v[j].offset <<" " << nitems_read(0) << " " << phase_est << std::endl;
}
if (v[j].key == pmt::mp("corr_est")) {
corr_est = pmt::to_double(v[j].value);
std::cout << "corr_est " << v[j].offset << " " << nitems_read(0) << " "
<< pmt::is_number(v[j].value) << " "
<< pmt::is_integer(v[j].value) << " "
<< pmt::is_real(v[j].value) << " "
<< pmt::to_double(v[j].value)
<< std::endl;
if (corr_est > 130e3) {
offset = v[j].offset - nitems_read(0);
break;
}
}
}
if (corr_est > 130e3) {
float phase_est = 0;
if (get_correlation_tag(i, offset, phase_est)) {
_state = DO_FILTER;
_sample_counter = 0;
_symbol_counter = 0;
@ -168,10 +146,10 @@ adaptive_dfe_impl::general_work(int noutput_items,
std::fill_n(_hist_symbols, 2*_nW, gr_complex(0));
std::fill_n(_taps_samples, _nB+_nF+1, gr_complex(0));
std::fill_n(_taps_symbols, _nW, gr_complex(0));
//_phase = -phase_est;
_taps_samples[_nB+1] = std::exp(gr_complex(0, -phase_est));
_phase = -phase_est;
_taps_samples[_nB+1] = 1;//gr_expj(-phase_est);
_taps_symbols[0] = 1;
GILLock lock;
GILLock gil_lock;
try {
update_frame_information(_physicalLayer.attr("get_frame")());
} catch (boost::python::error_already_set const&) {
@ -182,16 +160,16 @@ adaptive_dfe_impl::general_work(int noutput_items,
if (_state == DO_FILTER) {
gr_complex dot_samples = 0;
// volk_32fc_x2_dot_prod_32fc(&dot_samples,
// &_hist_samples.front()+_hist_sample_index,
// &_taps_samples.front(),
// _taps_samples.size());
gr_complex filter_output = dot_samples;
// _hist_samples+_hist_sample_index,
// _taps_samples,
// _nB+_nF+1);
// if (_sample_counter < 80*5)
// std::cout << "SAMPLE " << _sample_counter << " " << dot_samples << std::endl;
gr_complex filter_output = dot_samples;
if ((_sample_counter%_sps) == 0) {
if (_symbol_counter == _symbols.size()) {
_symbol_counter = 0;
GILLock lock;
GILLock gil_lock;
try {
boost::python::numpy::ndarray s = boost::python::numpy::from_data(&_descrambled_symbols.front(),
boost::python::numpy::dtype::get_builtin<gr_complex>(),
@ -243,7 +221,8 @@ adaptive_dfe_impl::general_work(int noutput_items,
_taps_symbols[j] -= _mu*err*std::conj(_hist_symbols[_hist_symbol_index+j]) + _alpha*_taps_symbols[j];
}
}
// std::cout << "filter: " << _symbol_counter << " " << _sample_counter << " " << filter_output << " " << known_symbol << " " << std::abs(err) << std::endl;
// if (_sample_counter < 80*5)
// std::cout << "filter: " << _symbol_counter << " " << _sample_counter << " " << filter_output << " " << known_symbol << " " << std::abs(err) << std::endl;
}
if (is_known) {
_taps_symbols[_hist_symbol_index] = _taps_symbols[_hist_symbol_index + _nW] = known_symbol;
@ -266,15 +245,16 @@ adaptive_dfe_impl::general_work(int noutput_items,
bool adaptive_dfe_impl::start()
{
gr::thread::scoped_lock lock(d_setlock);
// make sure python is ready for threading
if( Py_IsInitialized() ){
GILLock lock;
GILLock gil_lock;
if(PyEval_ThreadsInitialized() != 1 ){
PyEval_InitThreads();
}
boost::python::numpy::initialize();
} else {
throw std::runtime_error("dont use es_pyhandler without python!");
throw std::runtime_error("dont use adaptive_dfe without python!");
}
_taps_samples = (gr_complex*)(volk_malloc( (_nB+_nF+1)*sizeof(gr_complex), volk_get_alignment()));
_taps_symbols = (gr_complex*)(volk_malloc( _nW*sizeof(gr_complex), volk_get_alignment()));
@ -284,7 +264,7 @@ bool adaptive_dfe_impl::start()
_taps_symbols[0] = 1;
std::cout << "adaptive_dfe_impl::start()" << std::endl;
GILLock lock;
GILLock gil_lock;
try {
boost::python::object module = boost::python::import(boost::python::str("digitalhf.physical_layer." + _py_module_name));
boost::python::object PhysicalLayer = module.attr("PhysicalLayer");
@ -298,13 +278,14 @@ bool adaptive_dfe_impl::start()
}
bool adaptive_dfe_impl::stop()
{
gr::thread::scoped_lock lock(d_setlock);
std::cout << "adaptive_dfe_impl::stop()" << std::endl;
GILLock lock;
GILLock gil_lock;
_physicalLayer = boost::python::object();
volk_free(_taps_samples);
volk_free(_taps_symbols);
volk_free(_hist_samples);
volk_free(_hist_symbols);
VOLK_SAFE_DELETE(_taps_samples);
VOLK_SAFE_DELETE(_taps_symbols);
VOLK_SAFE_DELETE(_hist_samples);
VOLK_SAFE_DELETE(_hist_symbols);
return true;
}
@ -348,19 +329,55 @@ void adaptive_dfe_impl::update_doppler_information(boost::python::object obj)
{
int const n = boost::python::extract<int>(obj.attr("__len__")());
assert(n==2);
double const do_continue = boost::python::extract<bool>(obj[0]);
double const doppler = boost::python::extract<float>(obj[1]);
bool const do_continue = boost::python::extract<bool>(obj[0]);
float const doppler = boost::python::extract<float>(obj[1]);
float delta_f = doppler/_sps;
update_pll(doppler);
}
void adaptive_dfe_impl::update_pll(float doppler) {
if (doppler == 0)
return;
float const delta_f = doppler/_sps;
if (_df == 0) { // init
_ud = _df = -delta_f;
_ud = _df = delta_f;
} else {
const float ud_old = _ud;
_ud = -delta_f;
float const ud_old = _ud;
_ud = delta_f;
_df +=_b[0]*_ud + _b[1]*ud_old;
}
std::cout << "PLL: " << _df << " " << delta_f << std::endl;
_sum_phase_diff = 0;
}
void adaptive_dfe_impl::insert_sample(gr_complex z) {
// local oscillator update
_phase += _df;
if (_phase > M_PI)
_phase -= 2*M_PI;
if (_phase < -M_PI)
_phase += 2*M_PI;
// insert sample into the circular buffer
_hist_samples[_hist_sample_index] = _hist_samples[_hist_sample_index+_nB+_nF+1] = z * gr_expj(-_phase);
if (++_hist_sample_index == _nB+_nF+1)
_hist_sample_index = 0;
}
bool adaptive_dfe_impl::get_correlation_tag(uint64_t i, uint64_t& offset, float& phase_est) {
std::vector<tag_t> v;
get_tags_in_window(v, 0, i,i+1);
for (int j=0; j<v.size(); ++j) {
std::cout << "tag " << v[j].key << " " << v[j].offset-nitems_read(0) << std::endl;
if (v[j].key == pmt::mp("phase_est")) {
phase_est = pmt::to_double(v[j].value);
std::cout << "phase_est " << v[j].offset <<" " << nitems_read(0) << " " << phase_est << std::endl;
offset = v[j].offset - nitems_read(0);
}
if (v[j].key == pmt::mp("corr_est")) {
double const corr_est = pmt::to_double(v[j].value);
if (v[j].offset - nitems_read(0) == offset)// && corr_est > 18e3)
return true;
}
}
return false;
}
} /* namespace digitalhf */

5
lib/adaptive_dfe_impl.h
View file

@ -60,7 +60,6 @@ private:
int _symbol_counter;
// PLL for doppler tracking
float _sum_phase_diff;
float _df; // frequency offset in radians per sample
float _phase; // accumulated phase for frequency correction
const float _b[2];
@ -75,6 +74,10 @@ private:
void update_frame_information(boost::python::object obj);
void update_doppler_information(boost::python::object obj);
void insert_sample(gr_complex z);
void update_pll(float doppler);
bool get_correlation_tag(uint64_t i, uint64_t& offset, float& phase_est);
public:
adaptive_dfe_impl(int sps, // samples per symbol
int nB, // number of forward FIR taps

2
python/physical_layer/STANAG_4285.py
View file

@ -41,7 +41,7 @@ class PhysicalLayer(object):
if self._counter == 0: ## preamble
doppler = PhysicalLayer.data_aided_frequency_estimation(s, self._preamble[0]['symb'])
self._counter = (self._counter+1)&1
return [True, 2*doppler]
return [True, doppler]
@staticmethod
def get_preamble():