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Diffstat (limited to 'gsm-tvoid/src/lib/gsm_burst.h')
| -rwxr-xr-x | gsm-tvoid/src/lib/gsm_burst.h | 147 |
1 files changed, 147 insertions, 0 deletions
diff --git a/gsm-tvoid/src/lib/gsm_burst.h b/gsm-tvoid/src/lib/gsm_burst.h new file mode 100755 index 0000000..ce727fe --- /dev/null +++ b/gsm-tvoid/src/lib/gsm_burst.h @@ -0,0 +1,147 @@ +#ifndef INCLUDED_GSM_BURST_H +#define INCLUDED_GSM_BURST_H + +//TODO: rename to gsm_burst_receiver ? use gsm_burst as encapsulation of an actual burst, incl bbuf, etc. +// need to determine what is a decoder vs. burst function. E.g. calc_freq_offset +// everything but I/O & clocking & sync_state? +// What about handling complex&diff&bin data? + +#include <gsm_constants.h> +#include <gr_math.h> + +//Console printing options +#define PRINT_NOTHING 0x00000000 +#define PRINT_EVERYTHING 0x7FFFFFFF //7 for SWIG overflow check work around +#define PRINT_BITS 0x00000001 +#define PRINT_ALL_BITS 0x00000002 +#define PRINT_CORR_BITS 0x00000004 + +#define PRINT_ALL_TYPES 0x00000FF0 +#define PRINT_KNOWN 0x00000008 +#define PRINT_UNKNOWN 0x00000010 +#define PRINT_TS0 0x00000020 +#define PRINT_FCCH 0x00000040 +#define PRINT_SCH 0x00000080 +#define PRINT_DUMMY 0x00000100 +#define PRINT_NORMAL 0x00000200 + +//Timing/clock options +#define QB_NONE 0x00000000 +#define QB_QUARTER 0x00000001 //only for internal clocked versions +#define QB_FULL04 0x00000003 +#define QB_MASK 0x0000000F + +#define CLK_CORR_TRACK 0x00000010 //adjust timing based on correlation offsets + +#define DEFAULT_CLK_OPTS ( QB_QUARTER | CLK_CORR_TRACK ) + +#define SIGNUM(x) ((x>0)-(x<0)) + +#define BBUF_SIZE TS_BITS + +// Center bursts in the TS, splitting the guard period +// +// +--+--+---...-----+--...---+----...----+--+--+ +// G T D1 TS D2 T G +// Start ^ + +#define MAX_SYNC_WAIT 176 //Bursts between SCH before reverting to WAIT_FCCH. (TODO: 88 should be max?) + +#define MAX_CORR_DIST 7 // 4 + 3 = 1/2 GUARD + TAIL +#define SCH_CORR_THRESHOLD 0.80 +#define FCCH_CORR_THRESHOLD 0.90 +#define NORM_CORR_THRESHOLD 0.80 + +#define FCCH_HITS_NEEDED (USEFUL_BITS - 4) +#define FCCH_MAX_MISSES 1 + +enum EQ_TYPE { + EQ_NONE, + EQ_FIXED_LINEAR, + EQ_ADAPTIVE_LINEAR, + EQ_FIXED_DFE, + EQ_ADAPTIVE_DFE, + EQ_VITERBI +}; + +class gsm_burst; + +class gsm_burst +{ +protected: + + gsm_burst(); + + //Burst Buffer: Storage for burst data + float d_burst_buffer[BBUF_SIZE]; + int d_bbuf_pos; //write position + int d_burst_start; //first useful bit (beginning of output) + unsigned long d_sample_count; //sample count at end (TODO:beginning) of BBUF (bit count if external clock) + unsigned long d_last_burst_s_count; //sample count from previous burst + + ///// Sync/training sequence correlation + //TODO: need all sync patterns + float corr_sync[N_SYNC_BITS]; //encoded sync bits for correlation + float corr_train_seq[10][N_TRAIN_BITS]; +// float d_corr[50]; + const float *d_corr_pattern; + int d_corr_pat_size; + float d_corr_max; + int d_corr_maxpos; + int d_corr_center; + + ///// Burst information + SYNC_STATE d_sync_state; + BURST_TYPE d_burst_type; + unsigned d_ts; //timeslot 0-7 + unsigned long d_burst_count; //Bursts received starting w/ initial FCCH reset after lost sync + unsigned long d_last_sch; //Burst count of last SCH + float d_freq_offset; + int d_color_code; + + //////// Methods + int get_burst(void); + BURST_TYPE get_fcch_burst(void); + BURST_TYPE get_sch_burst(void); + BURST_TYPE get_norm_burst(void); + + void shift_burst(int); + void calc_freq_offset(void); + void equalize(void); + float correlate_pattern(const float *,const int,const int,const int); + + void print_bits(const float *data,int length); + void print_burst(void); + + void diff_encode(const float *in,float *out,int length,float lastbit = 1.0); + void diff_decode(const float *in,float *out,int length,float lastbit = 1.0); + + +public: + ~gsm_burst (); + + ////// General Stats + //TODO: Maybe there should be a burst_stats class? + long d_sync_loss_count; + long d_fcch_count; + long d_part_sch_count; + long d_sch_count; + long d_normal_count; + long d_dummy_count; + long d_unknown_count; + + ////// Options + unsigned long d_clock_options; + unsigned long d_print_options; + EQ_TYPE d_equalizer_type; + + int sync_state() { return d_sync_state;} + float freq_offset() {return d_freq_offset;} + + //Methods + //TODO: reset state (e.g. channel change) + //void reset(void); +}; + + +#endif /* INCLUDED_GSM_BURST_H */ |