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Diffstat (limited to 'src/lib/gsm_receiver_cf.h')
| -rw-r--r-- | src/lib/gsm_receiver_cf.h | 254 |
1 files changed, 0 insertions, 254 deletions
diff --git a/src/lib/gsm_receiver_cf.h b/src/lib/gsm_receiver_cf.h deleted file mode 100644 index 21cb1ff..0000000 --- a/src/lib/gsm_receiver_cf.h +++ /dev/null @@ -1,254 +0,0 @@ -/* -*- c++ -*- */ -/* - * @file - * @author Piotr Krysik <pkrysik@stud.elka.pw.edu.pl> - * @section LICENSE - * - * This program 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. - * - * This program 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 this program; see the file COPYING. If not, write to - * the Free Software Foundation, Inc., 51 Franklin Street, - * Boston, MA 02110-1301, USA. - */ -#ifndef INCLUDED_GSM_RECEIVER_CF_H -#define INCLUDED_GSM_RECEIVER_CF_H - -#include <vector> -#include <list> -#include <gr_block.h> -#include <gr_complex.h> -#include <gr_feval.h> -#include <gsm_constants.h> -#include <gsm_receiver_config.h> - -#include <gsmstack.h> //TODO: remember to remove this line in the future! -#include "GSML1FEC.h" //!! -#include <a5-1-2.h>//!! -#include <string>//!! -#include <map>//!! - -class gsm_receiver_cf; - -typedef boost::shared_ptr<gsm_receiver_cf> gsm_receiver_cf_sptr; -typedef std::vector<gr_complex> vector_complex; - -gsm_receiver_cf_sptr gsm_make_receiver_cf(gr_feval_dd *tuner, gr_feval_dd *synchronizer, int osr, std::string key); - -/** 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 - */ - -class gsm_receiver_cf : public gr_block -{ - private: - std::map<char,int> d_hex_to_int; - FILE * d_gsm_file; //!! - byte d_KC[8]; //!! - GSM::TCHFACCHL1Decoder d_tch_decoder1; //!! - GSM::TCHFACCHL1Decoder d_tch_decoder2; //!! - GSM::TCHFACCHL1Decoder d_tch_decoder3; //!! - GSM::TCHFACCHL1Decoder d_tch_decoder4; //!! - GSM::TCHFACCHL1Decoder d_tch_decoder5; //!! - GSM::TCHFACCHL1Decoder d_tch_decoder6; //!! - GSM::TCHFACCHL1Decoder d_tch_decoder7; //!! - /**@name Configuration of the receiver */ - //@{ - const int d_OSR; ///< oversampling ratio - const int d_chan_imp_length; ///< channel impulse 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]; ///<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 - gr_feval_dd *d_synchronizer; ///<callback to a python object which is used to correct offset of USRP's internal clock - - /** Countes samples consumed by the receiver - * - * It is used in beetween find_fcch_burst and reach_sch_burst calls. - * My intention was to synchronize this counter with some internal sample - * counter of the USRP. Simple access to such USRP's counter isn't possible - * so this variable isn't used in the "synchronized" state of the receiver yet. - */ - unsigned d_counter; - - /**@name Variables used to store result of the find_fcch_burst fuction */ - //@{ - unsigned d_fcch_start_pos; ///< position of the first sample of the fcch burst - float d_freq_offset; ///< frequency offset of the received signal - //@} - std::list<double> d_freq_offset_vals; - - /**@name Identifiers of the BTS extracted from the SCH burst */ - //@{ - int d_ncc; ///< network color code - int d_bcc; ///< base station color code - //@} - - /**@name Internal state of the gsm receiver */ - //@{ - enum states { - first_fcch_search, next_fcch_search, sch_search, // synchronization search part - synchronized // receiver is synchronized in this state - } d_state; - //@} - - /**@name Variables which make internal state in the "synchronized" state */ - //@{ - burst_counter d_burst_nr; ///< frame number and timeslot number - channel_configuration d_channel_conf; ///< mapping of burst_counter to burst_type - //@} - - unsigned d_failed_sch; ///< number of subsequent erroneous SCH bursts - - // GSM Stack - GS_CTX d_gs_ctx;//TODO: remove it! it'a not right place for a decoder - - friend gsm_receiver_cf_sptr gsm_make_receiver_cf(gr_feval_dd *tuner, gr_feval_dd *synchronizer, int osr, std::string key); - gsm_receiver_cf(gr_feval_dd *tuner, gr_feval_dd *synchronizer, int osr, std::string key); - - /** Function whis is used to search a FCCH burst and to compute frequency offset before - * "synchronized" state of the receiver - * - * TODO: Describe the FCCH search algorithm in the documentation - * @param input vector with input signal - * @param nitems number of samples in the input vector - * @return - */ - bool find_fcch_burst(const gr_complex *input, const int nitems); - - /** Computes frequency offset from FCCH burst samples - * - * @param input vector with input samples - * @param first_sample number of the first sample of the FCCH busrt - * @param last_sample number of the last sample of the FCCH busrt - * @return frequency offset - */ - double compute_freq_offset(const gr_complex * input, unsigned first_sample, unsigned last_sample); - - /** Calls d_tuner's method to set frequency offset from Python level - * - * @param freq_offset absolute frequency offset of the received signal - */ - void set_frequency(double freq_offset); - - /** Computes angle between two complex numbers - * - * @param val1 first complex number - * @param val2 second complex number - * @return - */ - inline float compute_phase_diff(gr_complex val1, gr_complex val2); - - /** Function whis is used to get near to SCH burst - * - * @param nitems number of samples in the gsm_receiver's buffer - * @return true if SCH burst is near, false otherwise - */ - bool reach_sch_burst(const int nitems); - - /** Extracts channel impulse response from a SCH burst and computes first sample number of this burst - * - * @param input vector with input samples - * @param chan_imp_resp complex vector where channel impulse response will be stored - * @return number of first sample of the burst - */ - int get_sch_chan_imp_resp(const gr_complex *input, gr_complex * chan_imp_resp); - - /** MLSE detection of a burst bits - * - * Detects bits of burst using viterbi algorithm. - * @param input vector with input samples - * @param chan_imp_resp vector with the channel impulse response - * @param burst_start number of the first sample of the burst - * @param output_binary vector with output bits - */ - void detect_burst(const gr_complex * input, gr_complex * chan_imp_resp, int burst_start, unsigned char * output_binary); - - /** Encodes differentially input bits and maps them into MSK states - * - * @param input vector with input bits - * @param nitems number of samples in the "input" vector - * @param gmsk_output bits mapped into MSK states - * @param start_point first state - */ - void gmsk_mapper(const unsigned char * input, int nitems, gr_complex * gmsk_output, gr_complex start_point); - - /** Correlates MSK mapped sequence with input signal - * - * @param sequence MKS mapped sequence - * @param length length of the sequence - * @param input_signal vector with input samples - * @return correlation value - */ - gr_complex correlate_sequence(const gr_complex * sequence, int length, const gr_complex * input); - - /** Computes autocorrelation of input vector for positive arguments - * - * @param input vector with input samples - * @param out output vector - * @param nitems length of the input vector - */ - inline void autocorrelation(const gr_complex * input, gr_complex * out, int nitems); - - /** Filters input signal through channel impulse response - * - * @param input vector with input samples - * @param nitems number of samples to pass through filter - * @param filter filter taps - channel impulse response - * @param filter_length nember of filter taps - * @param output vector with filtered samples - */ - inline void mafi(const gr_complex * input, int nitems, gr_complex * filter, int filter_length, gr_complex * output); - - /** Extracts channel impulse response from a normal burst and computes first sample number of this burst - * - * @param input vector with input samples - * @param chan_imp_resp complex vector where channel impulse response will be stored - * @param search_range possible absolute offset of a channel impulse response start - * @param bcc base station color code - number of a training sequence - * @return first sample number of normal burst - */ - int get_norm_chan_imp_resp(const gr_complex * input, gr_complex * chan_imp_resp, int bcc); - - - /** - * - */ - void read_key(std::string key); - - /** - * - */ - void process_normal_burst(burst_counter burst_nr, const unsigned char * burst_binary); - - /** - * - */ - void configure_receiver(); - - - - public: - ~gsm_receiver_cf(); - void forecast(int noutput_items, gr_vector_int &ninput_items_required); - 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 /* INCLUDED_GSM_RECEIVER_CF_H */ |