--- /dev/null
+/* -*- c++ -*- */
+/*
+ * Copyright 2009 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 <cstdio>
+#include <cmath>
+
+#include <gr_pfb_clock_sync_ccf.h>
+#include <gr_fir_ccf.h>
+#include <gr_fir_util.h>
+#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,
+ const std::vector<float> &taps,
+ unsigned int filter_size,
+ float init_phase)
+{
+ return gr_pfb_clock_sync_ccf_sptr (new gr_pfb_clock_sync_ccf (sps, gain, taps,
+ filter_size,
+ init_phase));
+}
+
+
+gr_pfb_clock_sync_ccf::gr_pfb_clock_sync_ccf (float sps, float gain,
+ const std::vector<float> &taps,
+ unsigned int filter_size,
+ float init_phase)
+ : gr_block ("pfb_clock_sync_ccf",
+ gr_make_io_signature (1, 1, sizeof(gr_complex)),
+ gr_make_io_signature2 (2, 2, sizeof(gr_complex), sizeof(float))),
+ d_updated (false), d_sps(sps), d_alpha(gain)
+{
+ d_nfilters = filter_size;
+
+ // 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);
+ float x = init_phase / (2*M_PI); //normalize initial phase
+ d_acc = x*(d_nfilters-1);
+ d_last_filter = (int)floor(d_acc);
+ d_acc = fmodf(d_acc, 1);
+ d_start_count = 0;
+
+
+ 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++) {
+ d_filters[i] = gr_fir_util::create_gr_fir_ccf(vtaps);
+ d_diff_filters[i] = gr_fir_util::create_gr_fir_ccf(vtaps);
+ }
+
+ // Now, actually set the filters' taps
+ std::vector<float> dtaps;
+ create_diff_taps(taps, dtaps);
+ set_taps(taps, d_taps, d_filters);
+ set_taps(dtaps, d_dtaps, d_diff_filters);
+}
+
+gr_pfb_clock_sync_ccf::~gr_pfb_clock_sync_ccf ()
+{
+ for(unsigned int i = 0; i < d_nfilters; i++) {
+ delete d_filters[i];
+ }
+}
+
+void
+gr_pfb_clock_sync_ccf::set_taps (const std::vector<float> &newtaps,
+ std::vector< std::vector<float> > &ourtaps,
+ std::vector<gr_fir_ccf*> &ourfilter)
+{
+ unsigned int i,j;
+
+ unsigned int ntaps = newtaps.size();
+ d_taps_per_filter = (unsigned int)ceil((double)ntaps/(double)d_nfilters);
+
+ // Create d_numchan vectors to store each channel's taps
+ ourtaps.resize(d_nfilters);
+
+ // Make a vector of the taps plus fill it out with 0's to fill
+ // each polyphase filter with exactly d_taps_per_filter
+ std::vector<float> tmp_taps;
+ tmp_taps = newtaps;
+ while((float)(tmp_taps.size()) < d_nfilters*d_taps_per_filter) {
+ tmp_taps.push_back(0.0);
+ }
+
+ // 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);
+ 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
+ }
+
+ // Build a filter for each channel and add it's taps to it
+ ourfilter[i]->set_taps(ourtaps[i]);
+ }
+
+ // Set the history to ensure enough input items for each filter
+ set_history (d_taps_per_filter + d_sps);
+
+ d_updated = true;
+}
+
+void
+gr_pfb_clock_sync_ccf::create_diff_taps(const std::vector<float> &newtaps,
+ std::vector<float> &difftaps)
+{
+ difftaps.clear();
+ difftaps.push_back(0); //newtaps[0]);
+ for(unsigned int i = 1; i < newtaps.size()-1; i++) {
+ difftaps.push_back(newtaps[i+1] - newtaps[i-1]);
+ }
+ difftaps.push_back(0);//-newtaps[newtaps.size()-1]);
+}
+
+void
+gr_pfb_clock_sync_ccf::print_taps()
+{
+ unsigned int i, j;
+ for(i = 0; i < d_nfilters; i++) {
+ printf("filter[%d]: [%.4e, ", i, 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]);
+ }
+}
+
+void
+gr_pfb_clock_sync_ccf::print_diff_taps()
+{
+ unsigned int i, j;
+ for(i = 0; i < d_nfilters; i++) {
+ printf("filter[%d]: [%.4e, ", i, 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]);
+ }
+}
+
+
+std::vector<float>
+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++) {
+ taps.push_back(d_taps[channel][i]);
+ }
+ return taps;
+}
+
+std::vector<float>
+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++) {
+ taps.push_back(d_dtaps[channel][i]);
+ }
+ return taps;
+}
+
+
+int
+gr_pfb_clock_sync_ccf::general_work (int noutput_items,
+ gr_vector_int &ninput_items,
+ gr_vector_const_void_star &input_items,
+ gr_vector_void_star &output_items)
+{
+ gr_complex *in = (gr_complex *) input_items[0];
+ gr_complex *out = (gr_complex *) output_items[0];
+ float *err = (float *) output_items[1];
+
+ if (d_updated) {
+ d_updated = false;
+ return 0; // history requirements may have changed.
+ }
+
+ // 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;
+
+ // produce output as long as we can and there are enough input samples
+ while((i < noutput_items) && (count < nrequired)) {
+ out[i] = d_filters[d_last_filter]->filter(&in[count]);
+ error = (out[i] * d_diff_filters[d_last_filter]->filter(&in[count])).real();
+ err[i] = error;
+
+ d_acc += d_alpha*error;
+ gr_branchless_clip(d_acc, 1);
+
+ int newfilter;
+ newfilter = (int)((float)d_last_filter + d_acc);
+ if(newfilter != (int)d_last_filter)
+ d_acc = 0.5;
+
+ d_last_filter = newfilter % d_nfilters;
+ if(newfilter >= (int)d_nfilters) {
+ d_last_filter = newfilter - d_nfilters;
+ count++;
+ }
+ else if(newfilter < 0) {
+ d_last_filter = d_nfilters + newfilter;
+ count--;
+ }
+ else {
+ d_last_filter = newfilter;
+ }
+
+ i++;
+ count += d_sps;
+ }
+
+ // 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;
+}
--- /dev/null
+/* -*- c++ -*- */
+/*
+ * Copyright 2009 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.
+ */
+
+
+#ifndef INCLUDED_GR_PFB_CLOCK_SYNC_CCF_H
+#define INCLUDED_GR_PFB_CLOCK_SYNC_CCF_H
+
+#include <gr_block.h>
+
+class gr_pfb_clock_sync_ccf;
+typedef boost::shared_ptr<gr_pfb_clock_sync_ccf> gr_pfb_clock_sync_ccf_sptr;
+gr_pfb_clock_sync_ccf_sptr gr_make_pfb_clock_sync_ccf (float sps, float gain,
+ const std::vector<float> &taps,
+ unsigned int filter_size=32,
+ float init_phase=0);
+
+class gr_fir_ccf;
+
+/*!
+ * \class gr_pfb_clock_sync_ccf
+ *
+ * \brief Timing synchronizer using polyphase filterbanks
+ *
+ * \ingroup filter_blk
+ *
+ */
+
+class gr_pfb_clock_sync_ccf : public gr_block
+{
+ private:
+ /*!
+ * Build the polyphase filterbank timing synchronizer.
+ */
+ friend gr_pfb_clock_sync_ccf_sptr gr_make_pfb_clock_sync_ccf (float sps, float gain,
+ const std::vector<float> &taps,
+ unsigned int filter_size,
+ float init_phase);
+
+ bool d_updated;
+ unsigned int d_sps;
+ float d_alpha;
+ unsigned int d_nfilters;
+ std::vector<gr_fir_ccf*> d_filters;
+ std::vector<gr_fir_ccf*> d_diff_filters;
+ std::vector< std::vector<float> > d_taps;
+ std::vector< std::vector<float> > d_dtaps;
+ float d_acc;
+ unsigned int d_last_filter;
+ unsigned int d_start_count;
+ unsigned int d_taps_per_filter;
+
+ /*!
+ * Build the polyphase filterbank timing synchronizer.
+ */
+ gr_pfb_clock_sync_ccf (float sps, float gain,
+ const std::vector<float> &taps,
+ unsigned int filter_size,
+ float init_phase);
+
+ void create_diff_taps(const std::vector<float> &newtaps,
+ std::vector<float> &difftaps);
+
+public:
+ ~gr_pfb_clock_sync_ccf ();
+
+ /*!
+ * Resets the filterbank's filter taps with the new prototype filter
+ */
+ void set_taps (const std::vector<float> &taps,
+ std::vector< std::vector<float> > &ourtaps,
+ std::vector<gr_fir_ccf*> &ourfilter);
+ std::vector<float> channel_taps(int channel);
+ std::vector<float> diff_channel_taps(int channel);
+
+ /*!
+ * Print all of the filterbank taps to screen.
+ */
+ void print_taps();
+ void print_diff_taps();
+
+ int general_work (int noutput_items,
+ gr_vector_int &ninput_items,
+ gr_vector_const_void_star &input_items,
+ gr_vector_void_star &output_items);
+};
+
+#endif
--- /dev/null
+/* -*- c++ -*- */
+/*
+ * Copyright 2009 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.
+ */
+
+GR_SWIG_BLOCK_MAGIC(gr,pfb_clock_sync_ccf);
+
+gr_pfb_clock_sync_ccf_sptr gr_make_pfb_clock_sync_ccf (float sps, float gain,
+ const std::vector<float> &taps,
+ unsigned int filter_size=32,
+ float init_phase=0);
+
+class gr_pfb_clock_sync_ccf : public gr_block
+{
+ private:
+ gr_pfb_clock_sync_ccf (float sps, float gain,
+ const std::vector<float> &taps,
+ unsigned int filter_size,
+ float init_phase);
+
+ public:
+ ~gr_pfb_clock_sync_ccf ();
+
+ void set_taps (const std::vector<float> &taps,
+ std::vector< std::vector<float> > &ourtaps,
+ std::vector<gr_fir_ccf*> &ourfilter);
+
+ std::vector<float> channel_taps(int channel);
+ std::vector<float> diff_channel_taps(int channel);
+ void print_taps();
+ void print_diff_taps();
+};
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