mirror of
https://github.com/gnss-sdr/gnss-sdr
synced 2024-06-26 15:03:14 +00:00
228fa3b797
git-svn-id: https://svn.code.sf.net/p/gnss-sdr/code/trunk@72 64b25241-fba3-4117-9849-534c7e92360d
99 lines
2.8 KiB
C++
99 lines
2.8 KiB
C++
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/**
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* Copyright notice
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*/
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/**
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* Author: Carlos Avilés, 2010. carlos.avilesr(at)googlemail.com
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*/
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/**
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* Executes a resampler based on some input parameters.
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* This is intended to check performance of resampling implementations.
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*
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*/
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#include <iostream>
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#include <sys/time.h>
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#include <gflags/gflags.h>
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#include <glog/log_severity.h>
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#include <glog/logging.h>
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using google::LogMessage;
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#include <gr_top_block.h>
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#include <gr_file_source.h>
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#include <gr_null_sink.h>
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#include <gr_firdes.h>
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#include "gr_pfb_arb_resampler_ccf.h"
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DEFINE_string(signal_file, "signal_samples/signal.dat",
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"Path to the file containing the signal samples");
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DEFINE_int64(fs_in, 8000000, "FS of the signal in Hz");
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DEFINE_int64(fs_out, 2048000, "FS of the resampled signal in Hz");
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DEFINE_int64(trans_band, 100000, "Transition band of the filter");
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int mcd(int a, int b){
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if (a==0) return b;
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return mcd(b%a,a);
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}
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int main(int argc, char** argv) {
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google::InitGoogleLogging(argv[0]);
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double cutoff_freq;
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int div = mcd(FLAGS_fs_in,FLAGS_fs_out);
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unsigned int interpolation = FLAGS_fs_out/div;
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unsigned int decimation = FLAGS_fs_in/div;
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double sampling_freq = FLAGS_fs_in*interpolation;
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float rate = FLAGS_fs_in/FLAGS_fs_out;
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double gain = (double) interpolation;
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if(interpolation > decimation) {
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cutoff_freq = FLAGS_fs_in/2;
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} else {
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cutoff_freq = (interpolation*FLAGS_fs_in)/(decimation*2);
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}
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LOG_AT_LEVEL(INFO) << "fs_in " << FLAGS_fs_in;
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LOG_AT_LEVEL(INFO) << "fs_out " << FLAGS_fs_out;
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LOG_AT_LEVEL(INFO) << "signal file " << FLAGS_signal_file;
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LOG_AT_LEVEL(INFO) << "transition band " << FLAGS_trans_band;
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LOG_AT_LEVEL(INFO) << "Interpolation " << interpolation;
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LOG_AT_LEVEL(INFO) << "Decimation " << decimation;
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LOG_AT_LEVEL(INFO) << "LPF cut-off frequency " << cutoff_freq;
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LOG_AT_LEVEL(INFO) << "Sampling frequency " << sampling_freq;
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gr_top_block_sptr top_block = gr_make_top_block("gr_pfb_arb_resampler_test");
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gr_file_source_sptr source = gr_make_file_source(sizeof(gr_complex),FLAGS_signal_file.c_str());
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std::vector<float> low_pass_taps =
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gr_firdes::low_pass(gain, sampling_freq, cutoff_freq, FLAGS_trans_band, (gr_firdes::win_type)1);
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LOG_AT_LEVEL(INFO) << "Taps count " << low_pass_taps.size();
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gr_pfb_arb_resampler_ccf_sptr resampler =
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gr_make_pfb_arb_resampler_ccf(rate, low_pass_taps, interpolation);
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gr_block_sptr sink = gr_make_null_sink(sizeof(gr_complex));
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top_block->connect(source, 0, resampler, 0);
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top_block->connect(resampler, 0, sink, 0);
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LOG_AT_LEVEL(INFO) << "Run";
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struct timeval tv;
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gettimeofday(&tv, NULL);
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long long int begin = tv.tv_sec * 1000000 + tv.tv_usec;
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top_block->run(); // Start threads and wait
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gettimeofday(&tv, NULL);
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long long int end = tv.tv_sec *1000000 + tv.tv_usec;
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LOG_AT_LEVEL(INFO) << "Finished in " << (end - begin) << " microseconds";
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std::cout << (end - begin) << std::endl;
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top_block->stop();
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}
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