diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/lib/gsm_receiver_cf.cc | 79 | ||||
| -rwxr-xr-x | src/python/gsm_findfcch.py | 1 |
2 files changed, 48 insertions, 32 deletions
diff --git a/src/lib/gsm_receiver_cf.cc b/src/lib/gsm_receiver_cf.cc index 5019c71..578cd80 100644 --- a/src/lib/gsm_receiver_cf.cc +++ b/src/lib/gsm_receiver_cf.cc @@ -24,7 +24,6 @@ #include "config.h" #endif -#include <gsm_receiver_cf.h> #include <gr_io_signature.h> #include <gr_math.h> #include <math.h> @@ -32,6 +31,9 @@ #include <list> #include <boost/circular_buffer.hpp> #include <algorithm> +#include <gsm_receiver_cf.h> +#include <viterbi_detector.h> +#include <sch.h> #define FCCH_BUFFER_SIZE (FCCH_HITS_NEEDED) #define SYNC_SEARCH_RANGE 40 @@ -112,7 +114,7 @@ gsm_receiver_cf::general_work(int noutput_items, if (find_fcch_burst(in, ninput_items[0])) { if (abs(d_freq_offset) > 100) { float mean_freq_offset = (prev_freq_offset + d_freq_offset) / 2; -// set_frequency(d_freq_offset); + set_frequency(d_freq_offset); } produced_out = 0; d_state = sch_search; @@ -125,7 +127,7 @@ gsm_receiver_cf::general_work(int noutput_items, case sch_search: if (find_sch_burst(in, ninput_items[0], out)) { // d_state = read_bcch; - d_state = read_bcch;//next_fcch_search; + d_state = next_fcch_search;//read_bcch; } else { d_state = sch_search; } @@ -284,8 +286,8 @@ double gsm_receiver_cf::compute_freq_offset() d_x2_temp += freq_offset * freq_offset; d_mean = d_x_temp / d_fcch_count; - DCOUT("freq_offset: " << freq_offset );//" d_best_sum: " << d_best_sum - DCOUT("wariancja: " << sqrt((d_x2_temp / d_fcch_count - d_mean * d_mean)) << " fcch_count:" << d_fcch_count << " d_mean: " << d_mean); + DCOUT("freq_offset: " << freq_offset );//" d_best_sum: " << d_best_sum +// DCOUT("wariancja: " << sqrt((d_x2_temp / d_fcch_count - d_mean * d_mean)) << " fcch_count:" << d_fcch_count << " d_mean: " << d_mean); return freq_offset; } @@ -328,14 +330,16 @@ bool gsm_receiver_cf::find_sch_burst(const gr_complex *in, const int nitems , fl gr_complex rhh[6]; gr_complex filtered_burst[148]; //!!!! + int fn_o; + int bsic_o; int burst_start = 0; - unsigned int stop_states[1] = { 4, }; + unsigned int stop_states[2] = {4,12}; float output[BURST_SIZE]; + unsigned char output_binary[BURST_SIZE]; float energy = 0; bool loop_end = false; vector_float::iterator iter; - gr_complex dzielnik(54, 0); while (!end) { switch (sch_search_state) { @@ -361,11 +365,11 @@ bool gsm_receiver_cf::find_sch_burst(const gr_complex *in, const int nitems , fl // DCOUT("find_sch_start d_counter" << d_counter); for (int ii = SYNC_POS * d_OSR; ii < (SYNC_POS + SYNC_SEARCH_RANGE)*d_OSR; ii++) { to_consume++; - gr_complex correlation = correlate_sequence(&d_sch_training_seq[5], &in[ii], N_SYNC_BITS - 10) / dzielnik; + gr_complex correlation = correlate_sequence(&d_sch_training_seq[5], &in[ii], N_SYNC_BITS - 10); correlation_buffer.push_back(correlation); // tylko do znalezienia odp imp kanału power_buffer.push_back(pow(abs(correlation), 2)); if (abs(correlation) > 30000 / 54) { - DCOUT("znaleziono środek sch na pozycji: " << ii - SYNC_POS * d_OSR); +// DCOUT("znaleziono środek sch na pozycji: " << ii - SYNC_POS * d_OSR); } } @@ -400,7 +404,7 @@ bool gsm_receiver_cf::find_sch_burst(const gr_complex *in, const int nitems , fl // std::cout << "# type: complex matrix\n" ; // std::cout << "# rows: 1\n" ; // std::cout << "# columns: " << (chan_imp_length)*d_OSR << "\n"; - + max_correlation = 0; for (int ii = 0; ii < (chan_imp_length)*d_OSR; ii++) { gr_complex correlation = correlation_buffer[strongest_window_nr + ii]; @@ -408,11 +412,11 @@ bool gsm_receiver_cf::find_sch_burst(const gr_complex *in, const int nitems , fl chan_imp_resp_center = ii; max_correlation = abs(correlation); } -// std::cout << correlation << " "; +// std::cout << correlation << " "; d_channel_imp_resp.push_back(correlation); chan_imp_resp[ii] = correlation; } - DCOUT("\nSrodek odp_imp:" << chan_imp_resp_center ); +// DCOUT("\nSrodek odp_imp:" << chan_imp_resp_center ); autocorrelation(chan_imp_resp, rhh_temp, chan_imp_length*d_OSR); // std::cout << "\n# name: rhh_temp\n" ; @@ -430,8 +434,8 @@ bool gsm_receiver_cf::find_sch_burst(const gr_complex *in, const int nitems , fl // std::cout << "# columns: " << (chan_imp_length) << "\n"; for (int ii = 0; ii < (chan_imp_length); ii++) { - rhh[ii] = rhh_temp[ii*d_OSR]; -// std::cout << rhh_temp[ii*d_OSR] << " "; + rhh[ii] = conj(rhh_temp[ii*d_OSR]); +// std::cout << rhh[ii] << " "; } // std::cout << "\n# name: normal_burst\n" ; @@ -439,10 +443,10 @@ bool gsm_receiver_cf::find_sch_burst(const gr_complex *in, const int nitems , fl // std::cout << "# rows: 1\n" ; // std::cout << "# columns: " << 156*d_OSR << "\n"; burst_start = strongest_window_nr + chan_imp_resp_center - 48 * d_OSR - 2 * d_OSR + 2 + SYNC_POS * d_OSR; -// for (int ii = 0; ii < 156*d_OSR; ii++) { -// gr_complex sample = in[burst_start+ii]; -// std::cout << sample << " "; -// } + for (int ii = 0; ii < 156*d_OSR; ii++) { + gr_complex sample = in[burst_start+ii]; +// std::cout << sample << " "; + } mafi(&in[burst_start], 148, chan_imp_resp, chan_imp_length*d_OSR, filtered_burst); @@ -450,15 +454,22 @@ bool gsm_receiver_cf::find_sch_burst(const gr_complex *in, const int nitems , fl // std::cout << "# type: complex matrix\n" ; // std::cout << "# rows: 1\n" ; // std::cout << "# columns: " << 148 << "\n"; -// for (int ii = 0; ii < 148; ii++) { -// gr_complex filtered_sample = filtered_burst[ii]; + for (int ii = 0; ii < 148; ii++) { + gr_complex filtered_sample = filtered_burst[ii]; // std::cout << filtered_sample << " "; -// } + } - viterbi_detector(filtered_burst, BURST_SIZE, rhh, 3, stop_states, 1, output); + viterbi_detector(filtered_burst, 148, rhh, 3, stop_states, 2, output); +// printf("# name: output\n# type: matrix\n# rows: 1\n# columns: 148\n"); + for(int i=0; i<BURST_SIZE ; i++){ + output_binary[i] = (output[i]>0); +// printf(" %d", output_binary[i]); + } +// printf("\n"); + decode_sch(&output_binary[3], &fn_o, &bsic_o); - std::cout << "\n\n"; - DCOUT("strongest_window_nr: " << strongest_window_nr); +// std::cout << "fn: " << fn_o << " bsic: " << bsic_o << "\n"; +// DCOUT("strongest_window_nr: " << strongest_window_nr); sch_search_state = sch_found; break; @@ -510,6 +521,7 @@ gr_complex gsm_receiver_cf::correlate_sequence(const gr_complex * sequence, cons result += sequence[ii] * conj(input_signal[sample_number]); } + result = result/gr_complex(length, 0); return result; } @@ -546,22 +558,25 @@ inline void gsm_receiver_cf::autocorrelation(const gr_complex * input, gr_comple inline void gsm_receiver_cf::mafi(const gr_complex * input, int input_length, gr_complex * filter, int filter_length, gr_complex * output) { int ii = 0, n, a; - std::cout << "\n"; +// std::cout << "\nfilter:"; +// for(n = 0; n < filter_length; n++) +// { +// std::cout << filter[n] << " "; +// } +// std::cout << "\n"; for (n = 0; n < input_length; n++) { a = n * d_OSR; output[n] = 0; ii = 0; - + while (ii < filter_length) { -// if (n == 0) { -// std::cout << "a:" << a << " ii: " << ii << " input[" << a + ii << "]: " << input[a+ii] << "\n"; -// } if ((a + ii) >= input_length*d_OSR) break; - - output[n] += input[a+ii] * filter[ii]; +// if(n==0) +// std::cout << input[a+ii] << " "; + output[n] += input[a+ii] * filter[ii]; //!!conj ii++; } -// output[n] = conj(output[n]); + output[n] = output[n]*gr_complex(0,-1);//!!nie powinno tego tu być } } diff --git a/src/python/gsm_findfcch.py b/src/python/gsm_findfcch.py index 5df5971..2050d33 100755 --- a/src/python/gsm_findfcch.py +++ b/src/python/gsm_findfcch.py @@ -73,6 +73,7 @@ class gsm_receiver_first_blood(gr.top_block): def _ustaw_interpolator(self): interpolator = gr.fractional_interpolator_cc(0, self.sps) +# interpolator = blks2.rational_resampler_ccf(13, 6) return interpolator def _ustaw_odbiornik(self): |