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added new burst type - dummy_or_normal for situations in which you don't know what type is used when

This commit is contained in:
Piotr Krysik 2009-06-18 14:10:17 +02:00
parent aa5a774a43
commit e71a1a8675
2 changed files with 20 additions and 3 deletions
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2
src/lib/gsm_constants.h
View File

@ -35,7 +35,7 @@
#define MAX_SCH_ERRORS 5 //maximum number of subsequent sch errors after which gsm receiver goes to find_next_fcch state
typedef enum {empty, fcch_burst, sch_burst, normal_burst, rach_burst, dummy} burst_type;
typedef enum {empty, fcch_burst, sch_burst, normal_burst, rach_burst, dummy, dummy_or_normal} burst_type;
typedef enum {unknown, multiframe_26, multiframe_51} multiframe_type;
static const unsigned char SYNC_BITS[] = {

21
src/lib/gsm_receiver_cf.cc
View File

@ -59,8 +59,8 @@ void gsm_receiver_cf::configure_receiver()
d_channel_conf.set_burst_types(TSC0, TEST_CCH_FRAMES, sizeof(TEST_CCH_FRAMES) / sizeof(unsigned), normal_burst);
d_channel_conf.set_burst_types(TSC0, FCCH_FRAMES, sizeof(FCCH_FRAMES) / sizeof(unsigned), fcch_burst);
// d_channel_conf.set_multiframe_type(TIMESLOT6, multiframe_26);
// d_channel_conf.set_burst_types(TIMESLOT6, TRAFFIC_CHANNEL_F, sizeof(TRAFFIC_CHANNEL_F) / sizeof(unsigned), normal_burst);
// d_channel_conf.set_multiframe_type(TIMESLOT7, multiframe_26);
// d_channel_conf.set_burst_types(TIMESLOT7, TRAFFIC_CHANNEL_F, sizeof(TRAFFIC_CHANNEL_F) / sizeof(unsigned), dummy_or_normal);
}
@ -239,6 +239,23 @@ gsm_receiver_cf::general_work(int noutput_items,
process_normal_burst(d_burst_nr, output_binary); //TODO: this shouldn't be here - remove it when gsm receiver's interface will be ready
break;
case dummy_or_normal: {
burst_start = get_norm_chan_imp_resp(input, &channel_imp_resp[0], TRAIN_SEARCH_RANGE, TS_DUMMY);
detect_burst(input, &channel_imp_resp[0], burst_start, output_binary);
std::vector<unsigned char> v(20);
std::vector<unsigned char>::iterator it;
it = std::set_difference(output_binary + TRAIN_POS, output_binary + TRAIN_POS + 16, &train_seq[TS_DUMMY][5], &train_seq[TS_DUMMY][21], v.begin());
int different_bits = (it - v.begin());
if (different_bits > 2) {
burst_start = get_norm_chan_imp_resp(input, &channel_imp_resp[0], TRAIN_SEARCH_RANGE, d_bcc);
detect_burst(input, &channel_imp_resp[0], burst_start, output_binary);
if (!output_binary[0] && !output_binary[1] && !output_binary[2]) {
process_normal_burst(d_burst_nr, output_binary); //TODO: this shouldn't be here - remove it when gsm receiver's interface will be ready
}
}
}
case rach_burst:
//implementation of this channel isn't possible in current gsm_receiver
//it would take some realtime processing, counter of samples from USRP to