#include <gr_io_signature.h>
#include <gr_math.h>
-gr_pfb_clock_sync_ccf_sptr gr_make_pfb_clock_sync_ccf (float sps, float gain,
+gr_pfb_clock_sync_ccf_sptr gr_make_pfb_clock_sync_ccf (double sps, float gain,
const std::vector<float> &taps,
unsigned int filter_size,
- float init_phase)
+ float init_phase,
+ float max_rate_deviation)
{
return gr_pfb_clock_sync_ccf_sptr (new gr_pfb_clock_sync_ccf (sps, gain, taps,
filter_size,
- init_phase));
+ init_phase,
+ max_rate_deviation));
}
-
-gr_pfb_clock_sync_ccf::gr_pfb_clock_sync_ccf (float sps, float gain,
+int ios[] = {sizeof(gr_complex), sizeof(float), sizeof(float), sizeof(float)};
+std::vector<int> iosig(ios, ios+sizeof(ios)/sizeof(int));
+gr_pfb_clock_sync_ccf::gr_pfb_clock_sync_ccf (double sps, float gain,
const std::vector<float> &taps,
unsigned int filter_size,
- float init_phase)
+ float init_phase,
+ float max_rate_deviation)
: gr_block ("pfb_clock_sync_ccf",
gr_make_io_signature (1, 1, sizeof(gr_complex)),
- gr_make_io_signature2 (1, 2, sizeof(gr_complex), sizeof(float))),
- d_updated (false), d_sps(sps)
+ gr_make_io_signaturev (1, 4, iosig)),
+ d_updated (false), d_nfilters(filter_size),
+ d_max_dev(max_rate_deviation)
{
d_nfilters = filter_size;
+ d_sps = floor(sps);
// Store the last filter between calls to work
// The accumulator keeps track of overflow to increment the stride correctly.
// set it here to the fractional difference based on the initial phaes
- // assert(init_phase <= 2*M_PI);
- set_gain(gain);
- d_k = d_nfilters / 2;
- d_rate = 0;
- d_start_count = 0;
-
+ set_alpha(gain);
+ set_beta(0.25*gain*gain);
+ d_k = init_phase;
+ d_rate = (sps-floor(sps))*(double)d_nfilters;
+ d_rate_i = (int)floor(d_rate);
+ d_rate_f = d_rate - (float)d_rate_i;
+ d_filtnum = (int)floor(d_k);
d_filters = std::vector<gr_fir_ccf*>(d_nfilters);
d_diff_filters = std::vector<gr_fir_ccf*>(d_nfilters);
// Create an FIR filter for each channel and zero out the taps
std::vector<float> vtaps(0, d_nfilters);
- for(unsigned int i = 0; i < d_nfilters; i++) {
+ for(int i = 0; i < d_nfilters; i++) {
d_filters[i] = gr_fir_util::create_gr_fir_ccf(vtaps);
d_diff_filters[i] = gr_fir_util::create_gr_fir_ccf(vtaps);
}
gr_pfb_clock_sync_ccf::~gr_pfb_clock_sync_ccf ()
{
- for(unsigned int i = 0; i < d_nfilters; i++) {
+ for(int i = 0; i < d_nfilters; i++) {
delete d_filters[i];
}
}
std::vector< std::vector<float> > &ourtaps,
std::vector<gr_fir_ccf*> &ourfilter)
{
- unsigned int i,j;
+ int i,j;
unsigned int ntaps = newtaps.size();
d_taps_per_filter = (unsigned int)ceil((double)ntaps/(double)d_nfilters);
// Partition the filter
for(i = 0; i < d_nfilters; i++) {
// Each channel uses all d_taps_per_filter with 0's if not enough taps to fill out
- ourtaps[i] = std::vector<float>(d_taps_per_filter, 0);
+ ourtaps[d_nfilters-1-i] = std::vector<float>(d_taps_per_filter, 0);
for(j = 0; j < d_taps_per_filter; j++) {
- ourtaps[i][j] = tmp_taps[i + j*d_nfilters]; // add taps to channels in reverse order
+ ourtaps[d_nfilters - 1 - i][j] = tmp_taps[i + j*d_nfilters];
}
// Build a filter for each channel and add it's taps to it
- ourfilter[i]->set_taps(ourtaps[i]);
+ ourfilter[i]->set_taps(ourtaps[d_nfilters-1-i]);
}
// Set the history to ensure enough input items for each filter
gr_pfb_clock_sync_ccf::create_diff_taps(const std::vector<float> &newtaps,
std::vector<float> &difftaps)
{
- float maxtap = -1e12;
+ float maxtap = 1e-20;
difftaps.clear();
difftaps.push_back(0); //newtaps[0]);
for(unsigned int i = 1; i < newtaps.size()-1; i++) {
float tap = newtaps[i+1] - newtaps[i-1];
+ difftaps.push_back(tap);
if(tap > maxtap) {
- maxtap = tap;
+ maxtap = tap;
}
- //maxtap += tap;
- difftaps.push_back(tap);
}
difftaps.push_back(0);//-newtaps[newtaps.size()-1]);
+ // Scale the differential taps; helps scale error term to better update state
+ // FIXME: should this be scaled this way or use the same gain as the taps?
for(unsigned int i = 0; i < difftaps.size(); i++) {
- difftaps[i] /= 1;//maxtap;
+ difftaps[i] /= maxtap;
}
}
void
gr_pfb_clock_sync_ccf::print_taps()
{
- unsigned int i, j;
+ int i, j;
+ printf("[ ");
for(i = 0; i < d_nfilters; i++) {
- printf("filter[%d]: [%.4e, ", i, d_taps[i][0]);
+ printf("[%.4e, ", d_taps[i][0]);
for(j = 1; j < d_taps_per_filter-1; j++) {
printf("%.4e,", d_taps[i][j]);
}
- printf("%.4e]\n", d_taps[i][j]);
+ printf("%.4e],", d_taps[i][j]);
}
+ printf(" ]\n");
}
void
gr_pfb_clock_sync_ccf::print_diff_taps()
{
- unsigned int i, j;
+ int i, j;
+ printf("[ ");
for(i = 0; i < d_nfilters; i++) {
- printf("filter[%d]: [%.4e, ", i, d_dtaps[i][0]);
+ printf("[%.4e, ", d_dtaps[i][0]);
for(j = 1; j < d_taps_per_filter-1; j++) {
printf("%.4e,", d_dtaps[i][j]);
}
- printf("%.4e]\n", d_dtaps[i][j]);
+ printf("%.4e],", d_dtaps[i][j]);
}
+ printf(" ]\n");
}
gr_pfb_clock_sync_ccf::channel_taps(int channel)
{
std::vector<float> taps;
- unsigned int i;
- for(i = 0; i < d_taps_per_filter; i++) {
+ for(int i = 0; i < d_taps_per_filter; i++) {
taps.push_back(d_taps[channel][i]);
}
return taps;
gr_pfb_clock_sync_ccf::diff_channel_taps(int channel)
{
std::vector<float> taps;
- unsigned int i;
- for(i = 0; i < d_taps_per_filter; i++) {
+ for(int i = 0; i < d_taps_per_filter; i++) {
taps.push_back(d_dtaps[channel][i]);
}
return taps;
// We need this many to process one output
int nrequired = ninput_items[0] - d_taps_per_filter;
- int i = 0, count = d_start_count;
- float error = 0;
+ int i = 0, count = 0;
+ float error, error_r, error_i;
// produce output as long as we can and there are enough input samples
while((i < noutput_items) && (count < nrequired)) {
- int filtnum = (int)d_k;
- out[i] = d_filters[filtnum]->filter(&in[count]);
- error = (out[i] * d_diff_filters[filtnum]->filter(&in[count])).real();
+ d_filtnum = (int)floor(d_k);
- d_k = d_k + d_alpha*error + d_rate;
- d_rate = d_rate + d_beta*error;
- while(d_k >= d_nfilters) {
+ // Keep the current filter number in [0, d_nfilters]
+ // If we've run beyond the last filter, wrap around and go to next sample
+ // If we've go below 0, wrap around and go to previous sample
+ while(d_filtnum >= d_nfilters) {
d_k -= d_nfilters;
- count++;
+ d_filtnum -= d_nfilters;
+ count += 1;
}
- while(d_k < 0) {
+ while(d_filtnum < 0) {
d_k += d_nfilters;
- count--;
+ d_filtnum += d_nfilters;
+ count -= 1;
}
+ out[i] = d_filters[d_filtnum]->filter(&in[count]);
+ gr_complex diff = d_diff_filters[d_filtnum]->filter(&in[count]);
+ error_r = out[i].real() * diff.real();
+ error_i = out[i].imag() * diff.imag();
+ error = (error_i + error_r) / 2.0; // average error from I&Q channel
+
+ // Run the control loop to update the current phase (k) and tracking rate
+ d_k = d_k + d_alpha*error + d_rate_i + d_rate_f;
+ d_rate_f = d_rate_f + d_beta*error;
+
+ // Keep our rate within a good range
+ d_rate_f = gr_branchless_clip(d_rate_f, d_max_dev);
+
i++;
- count += d_sps;
+ count += (int)floor(d_sps);
if(output_items.size() > 2) {
err[i] = error;
- outrate[i] = d_rate;
+ outrate[i] = d_rate_f;
outk[i] = d_k;
}
-
- //printf("error: %f k: %f rate: %f\n",
- // error, d_k, d_rate);
}
+ consume_each(count);
- // Set the start index at the next entrance to the work function
- // if we stop because we run out of input items, jump ahead in the
- // next call to work. Otherwise, we can start at zero.
- if(count > nrequired) {
- d_start_count = count - (nrequired);
- consume_each(ninput_items[0]-d_taps_per_filter);
- }
- else {
- d_start_count = 0;
- consume_each(count);
- }
-
return i;
}
projects / debian / gnuradio / blobdiff