diff options
Diffstat (limited to 'src/lib/gsm_receiver_cf.h')
| -rw-r--r-- | src/lib/gsm_receiver_cf.h | 132 |
1 files changed, 113 insertions, 19 deletions
diff --git a/src/lib/gsm_receiver_cf.h b/src/lib/gsm_receiver_cf.h index 8e30b42..ce05b81 100644 --- a/src/lib/gsm_receiver_cf.h +++ b/src/lib/gsm_receiver_cf.h @@ -1,8 +1,8 @@ /* -*- c++ -*- */ /* - * Copyright 2004 Free Software Foundation, Inc. - * - * This file is part of GNU Radio + * @file + * @author Piotr Krysik <pkrysik@stud.elka.pw.edu.pl> + * @section LICENSE * * 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 @@ -34,35 +34,30 @@ class gsm_receiver_cf; typedef boost::shared_ptr<gsm_receiver_cf> gsm_receiver_cf_sptr; typedef std::vector<gr_complex> vector_complex; -/*! - * \brief Return a shared_ptr to a new instance of gsm_receiver_cf. - * - * To avoid accidental use of raw pointers, gsm_receiver_cf's - * constructor is private. howto_make_square_ff is the public - * interface for creating new instances. - */ gsm_receiver_cf_sptr gsm_make_receiver_cf(gr_feval_dd *tuner, int osr); -/*! - * \brief Receives fcch +/** GSM Receiver GNU Radio block + * GSM Receiver class supports frequency correction, synchronisation and + * MLSE (Maximum Likelihood Sequence Estimation) estimation of synchronisation + * bursts and normal bursts. * \ingroup block - * \sa */ class gsm_receiver_cf : public gr_block { private: + const int d_OSR; const int d_chan_imp_length; - gr_complex d_sch_training_seq[N_SYNC_BITS]; //encoded training sequence of a SCH burst - gr_complex d_norm_training_seq[TRAIN_SEQ_NUM][N_TRAIN_BITS]; - - gr_feval_dd *d_tuner; - unsigned d_counter; + gr_complex d_sch_training_seq[N_SYNC_BITS]; ///<encoded training sequence of a SCH burst + gr_complex d_norm_training_seq[TRAIN_SEQ_NUM][N_TRAIN_BITS]; ///<encoded training sequences of a normal bursts and dummy bursts + + gr_feval_dd *d_tuner; ///<callback to a python object which is used for frequency tunning + unsigned d_samples_counter; ///<samples counter - this is used in beetween find_fcch_burst and find_sch_burst //variables used to store result of the find_fcch_burst fuction - int d_fcch_start_pos; +// unsigned d_fcch_start_pos; float d_freq_offset; burst_counter d_burst_nr; @@ -81,20 +76,119 @@ class gsm_receiver_cf : public gr_block friend gsm_receiver_cf_sptr gsm_make_receiver_cf(gr_feval_dd *tuner, int osr); gsm_receiver_cf(gr_feval_dd *tuner, int osr); + + /** + * + * @param in + * @param nitems + * @return + */ bool find_fcch_burst(const gr_complex *in, const int nitems); + + /** + * + * @param best_sum + * @param denominator + * @return + */ double compute_freq_offset(double best_sum, unsigned denominator); + + /** + * + * @param freq_offset + */ void set_frequency(double freq_offset); + + /** + * + * @param val1 + * @param val2 + * @return + */ inline float compute_phase_diff(gr_complex val1, gr_complex val2); + /** + * + * @param in + * @param nitems + * @param out + * @return + */ bool find_sch_burst(const gr_complex *in, const int nitems , float *out); + + /** + * + * @param in + * @param chan_imp_resp + * @return + */ int get_sch_chan_imp_resp(const gr_complex *in, gr_complex * chan_imp_resp); + + /** + * + * @param in + * @param chan_imp_resp + * @param burst_start + * @param output_binary + */ void detect_burst(const gr_complex * in, gr_complex * chan_imp_resp, int burst_start, unsigned char * output_binary); + + /** + * + * @param input + * @param ninput + * @param gmsk_output + * @param start_point + */ void gmsk_mapper(const unsigned char * input, int ninput, gr_complex * gmsk_output, gr_complex start_point); + + /** + * + * @param sequence + * @param input_signal + * @param ninput + * @return + */ gr_complex correlate_sequence(const gr_complex * sequence, const gr_complex * input_signal, int ninput); + + /** + * + * @param input + * @param out + * @param length + */ inline void autocorrelation(const gr_complex * input, gr_complex * out, int length); + + /** + * + * @param input + * @param input_length + * @param filter + * @param filter_length + * @param output + */ inline void mafi(const gr_complex * input, int input_length, gr_complex * filter, int filter_length, gr_complex * output); + + /** + * + * @param in + * @param chan_imp_resp + * @param search_range + * @param bcc + * @return + */ int get_norm_chan_imp_resp(const gr_complex *in, gr_complex * chan_imp_resp, unsigned search_range, int bcc); + + /** + * + * @param burst_nr + * @param pakiet + */ void przetwarzaj_normalny_pakiet(burst_counter burst_nr, unsigned char * pakiet); + + /** + * + */ void konfiguruj_odbiornik(); public: |