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@ -32,45 +32,72 @@
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#define MAX_LEN 70176
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#define MAX_LEN 70176
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uint32_t nof_prb = 25;
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// PRACH Parameters
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uint32_t preamble_format = 0;
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static uint32_t nof_prb = 25;
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uint32_t root_seq_idx = 0;
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static uint32_t preamble_format = 0;
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uint32_t seq_idx = 0;
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static uint32_t root_seq_idx = 0;
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uint32_t frequency_offset = 0;
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static uint32_t seq_idx = 0;
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uint32_t zero_corr_zone = 11;
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static uint32_t frequency_offset = 0;
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float timeadv = 0;
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static uint32_t zero_corr_zone = 11;
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uint32_t nof_frames = 20;
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static bool high_speed_flag = false;
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uint32_t num_ra_preambles = 0; // use default
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// Simulation parameters
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float uhd_rx_gain = 40, uhd_tx_gain = 60, uhd_freq = 2.4e9;
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static float timeadv = 0;
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char* uhd_args = "";
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static uint32_t num_ra_preambles = 0; // use default
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char* output_filename = "prach_rx";
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static uint32_t nof_repetitions = 1;
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static bool continous_tx = true;
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static char* output_filename = NULL;
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static const uint32_t nof_frames = 20;
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static const uint32_t tx_delay_ms = 4;
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// RF parameters
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static float uhd_rx_gain = 40, uhd_tx_gain = 60, uhd_freq = 2.4e9;
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static char* uhd_args = "";
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// SRSLTE Verbose
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SRSLTE_API extern int srslte_verbose;
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void usage(char* prog)
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void usage(char* prog)
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{
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{
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printf("Usage: %s \n", prog);
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printf("Usage: %s \n", prog);
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printf("\t-a UHD args [Default %s]\n", uhd_args);
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printf(" -a UHD args [Default %s]\n", uhd_args);
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printf("\t-f UHD TX/RX frequency [Default %.2f MHz]\n", uhd_freq / 1e6);
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printf(" -c Continous Tx? [Default %s]\n", continous_tx ? "true" : "false");
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printf("\t-g UHD RX gain [Default %.1f dB]\n", uhd_rx_gain);
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printf(" -f UHD TX/RX frequency [Default %.2f MHz]\n", uhd_freq / 1e6);
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printf("\t-G UHD TX gain [Default %.1f dB]\n", uhd_tx_gain);
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printf(" -g UHD RX gain [Default %.1f dB]\n", uhd_rx_gain);
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printf("\t-p Number of UL RB [Default %d]\n", nof_prb);
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printf(" -G UHD TX gain [Default %.1f dB]\n", uhd_tx_gain);
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printf("\t-F Preamble format [Default %d]\n", preamble_format);
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printf(" -p Number of UL RB [Default %d]\n", nof_prb);
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printf("\t-O Frequency offset [Default %d]\n", frequency_offset);
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printf(" -F Preamble format [Default %d]\n", preamble_format);
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printf("\t-s sequence index [Default %d]\n", seq_idx);
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printf(" -O Frequency offset [Default %d]\n", frequency_offset);
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printf("\t-r Root sequence index [Default %d]\n", root_seq_idx);
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printf(" -s sequence index [Default %d]\n", seq_idx);
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printf("\t-t Time advance (us) [Default %.1f us]\n", timeadv);
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printf(" -r Root sequence index [Default %d]\n", root_seq_idx);
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printf("\t-z Zero correlation zone config [Default %d]\n", zero_corr_zone);
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printf(" -R Number of repetitions of %d ms [Default %d]\n", nof_frames, nof_repetitions);
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printf("\t-o Save transmitted PRACH in file [Default no]\n");
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printf(" -t Time advance (us) [Default %.1f us]\n", timeadv);
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printf(" -z Zero correlation zone config [Default %d]\n", zero_corr_zone);
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printf(" -o Save transmitted PRACH in file [Default no]\n");
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printf(" -v [set srslte_verbose to info, debug, default none]\n");
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printf("\n");
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printf("Device arguments for:\n");
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printf(" X300: type=x300,addr=192.168.40.2,send_frame_size=2000,recv_frame_size=2000\n");
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printf(" B200: type=b200\n");
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printf("\n");
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printf("Scripted example:\n");
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printf(" Iterate over all bandwidth for 5 minutes and saving all stdout and displays delay stats at the end:\n");
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printf(" for i in 6 15 25 50 75 100; do sudo ./lib/src/phy/phch/test/prach_test_usrp -a "
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"type=x300,addr=192.168.40.2,send_frame_size=2000,recv_frame_size=2000 -g 20 -G 20 -p $i -f 875e6 -R 15000 | "
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"tee prach_test_usrp_$i.txt; done; grep \"delay:\" prach_*\n");
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}
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}
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void parse_args(int argc, char** argv)
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void parse_args(int argc, char** argv)
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{
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{
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int opt;
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int opt;
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while ((opt = getopt(argc, argv, "apfFgGrstoPOz")) != -1) {
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while ((opt = getopt(argc, argv, "acpfFgGrRstoPOvz")) != -1) {
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switch (opt) {
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switch (opt) {
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case 'a':
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case 'a':
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uhd_args = argv[optind];
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uhd_args = argv[optind];
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break;
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break;
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case 'c':
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continous_tx = !continous_tx;
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break;
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case 'o':
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case 'o':
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output_filename = argv[optind];
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output_filename = argv[optind];
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break;
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break;
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@ -105,9 +132,15 @@ void parse_args(int argc, char** argv)
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case 'r':
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case 'r':
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root_seq_idx = (uint32_t)strtol(argv[optind], NULL, 10);
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root_seq_idx = (uint32_t)strtol(argv[optind], NULL, 10);
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break;
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break;
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case 'R':
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nof_repetitions = (uint32_t)strtol(argv[optind], NULL, 10);
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break;
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case 's':
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case 's':
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seq_idx = (uint32_t)strtol(argv[optind], NULL, 10);
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seq_idx = (uint32_t)strtol(argv[optind], NULL, 10);
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break;
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break;
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case 'v':
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srslte_verbose++;
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break;
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case 'z':
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case 'z':
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zero_corr_zone = (uint32_t)strtol(argv[optind], NULL, 10);
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zero_corr_zone = (uint32_t)strtol(argv[optind], NULL, 10);
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break;
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break;
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@ -118,19 +151,50 @@ void parse_args(int argc, char** argv)
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}
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}
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}
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}
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void rf_msg_callback(void* arg, srslte_rf_error_t error)
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{
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switch (error.type) {
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case SRSLTE_RF_ERROR_LATE:
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printf("L");
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break;
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case SRSLTE_RF_ERROR_UNDERFLOW:
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printf("U");
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break;
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case SRSLTE_RF_ERROR_OVERFLOW:
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printf("O");
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break;
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case SRSLTE_RF_ERROR_RX:
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printf("R");
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break;
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case SRSLTE_RF_ERROR_OTHER:
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printf("X");
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break;
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}
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}
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int main(int argc, char** argv)
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int main(int argc, char** argv)
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{
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{
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parse_args(argc, argv);
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parse_args(argc, argv);
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srslte_prach_t prach;
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srslte_prach_t prach = {};
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int srate = srslte_sampling_freq_hz(nof_prb);
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uint32_t flen = srate / 1000;
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// Allocate buffers
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cf_t* preamble = srslte_vec_cf_malloc(MAX_LEN);
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cf_t* zeros = srslte_vec_cf_malloc(flen);
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cf_t* buffer = srslte_vec_cf_malloc(flen * nof_frames);
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bool high_speed_flag = false;
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if (!preamble || !zeros || !buffer) {
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return SRSLTE_ERROR;
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}
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cf_t preamble[MAX_LEN];
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srslte_vec_cf_zero(preamble, MAX_LEN);
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memset(preamble, 0, sizeof(cf_t) * MAX_LEN);
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srslte_vec_cf_zero(zeros, flen);
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srslte_vec_cf_zero(buffer, flen * nof_frames);
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srslte_prach_cfg_t prach_cfg;
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srslte_prach_cfg_t prach_cfg = {};
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ZERO_OBJECT(prach_cfg);
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prach_cfg.config_idx = preamble_format;
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prach_cfg.config_idx = preamble_format;
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prach_cfg.hs_flag = high_speed_flag;
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prach_cfg.hs_flag = high_speed_flag;
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prach_cfg.freq_offset = 0;
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prach_cfg.freq_offset = 0;
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@ -139,27 +203,17 @@ int main(int argc, char** argv)
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prach_cfg.num_ra_preambles = num_ra_preambles;
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prach_cfg.num_ra_preambles = num_ra_preambles;
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if (srslte_prach_init(&prach, srslte_symbol_sz(nof_prb))) {
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if (srslte_prach_init(&prach, srslte_symbol_sz(nof_prb))) {
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return -1;
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return SRSLTE_ERROR;
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}
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}
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if (srslte_prach_set_cfg(&prach, &prach_cfg, nof_prb)) {
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if (srslte_prach_set_cfg(&prach, &prach_cfg, nof_prb)) {
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ERROR("Error initiating PRACH object\n");
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ERROR("Error initiating PRACH object\n");
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return -1;
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return SRSLTE_ERROR;
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}
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}
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int srate = srslte_sampling_freq_hz(nof_prb);
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uint32_t flen = srate / 1000;
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printf("Generating PRACH\n");
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printf("Generating PRACH\n");
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srslte_vec_cf_zero(preamble, flen);
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srslte_prach_gen(&prach, seq_idx, frequency_offset, preamble);
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srslte_prach_gen(&prach, seq_idx, frequency_offset, preamble);
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uint32_t prach_len = prach.N_seq + prach.N_cp;
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srslte_vec_save_file("generated", preamble, prach_len * sizeof(cf_t));
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cf_t* buffer = srslte_vec_cf_malloc(flen * nof_frames);
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// Send through UHD
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// Send through UHD
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srslte_rf_t rf;
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srslte_rf_t rf;
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printf("Opening RF device...\n");
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printf("Opening RF device...\n");
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@ -167,10 +221,15 @@ int main(int argc, char** argv)
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ERROR("Error opening &uhd\n");
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ERROR("Error opening &uhd\n");
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exit(-1);
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exit(-1);
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}
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}
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printf("Subframe len: %d samples\n", flen);
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printf("Test summary:\n");
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printf("Set RX gain: %.1f dB\n", uhd_rx_gain);
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printf(" Sub-frame len: %d samples\n", flen);
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printf("Set TX gain: %.1f dB\n", uhd_tx_gain);
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printf(" Set RX gain: %.1f dB\n", uhd_rx_gain);
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printf("Set TX/RX freq: %.2f MHz\n", uhd_freq / 1000000);
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printf(" Set TX gain: %.1f dB\n", uhd_tx_gain);
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printf(" Sampling rate: %.3f MHz\n", srate / 1e6);
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printf(" Set TX/RX freq: %.2f MHz\n", uhd_freq / 1000000);
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printf(" Total duration: %d milli-seconds\n", nof_repetitions * nof_frames);
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printf(" Continuous Tx: %s\n", continous_tx ? "true" : "false");
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printf("\n");
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srslte_rf_set_rx_gain(&rf, uhd_rx_gain);
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srslte_rf_set_rx_gain(&rf, uhd_rx_gain);
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srslte_rf_set_tx_gain(&rf, uhd_tx_gain);
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srslte_rf_set_tx_gain(&rf, uhd_tx_gain);
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@ -178,7 +237,7 @@ int main(int argc, char** argv)
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srslte_rf_set_tx_freq(&rf, 0, uhd_freq);
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srslte_rf_set_tx_freq(&rf, 0, uhd_freq);
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printf("Setting sampling rate %.2f MHz\n", (float)srate / 1000000);
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printf("Setting sampling rate %.2f MHz\n", (float)srate / 1000000);
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float srate_rf = srslte_rf_set_rx_srate(&rf, (double)srate);
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int srate_rf = (int)srslte_rf_set_rx_srate(&rf, (double)srate);
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if (srate_rf != srate) {
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if (srate_rf != srate) {
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ERROR("Could not set sampling rate\n");
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ERROR("Could not set sampling rate\n");
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exit(-1);
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exit(-1);
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@ -186,47 +245,118 @@ int main(int argc, char** argv)
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srslte_rf_set_tx_srate(&rf, (double)srate);
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srslte_rf_set_tx_srate(&rf, (double)srate);
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sleep(1);
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sleep(1);
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cf_t* zeros = calloc(sizeof(cf_t), flen);
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srslte_timestamp_t tstamp;
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srslte_timestamp_t tstamp;
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// Register error handler
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srslte_rf_register_error_handler(&rf, rf_msg_callback, NULL);
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// Start streaming
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srslte_rf_start_rx_stream(&rf, false);
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srslte_rf_start_rx_stream(&rf, false);
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uint32_t nframe = 0;
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while (nframe < nof_frames) {
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// Print Table legend
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printf("Rx subframe %d\n", nframe);
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printf("%8s; %5s; %5s; %5s; %6s; %5s; %9s;\n", "Time", "i", "count", "index", "usec", "samp", "Norm Peak");
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// Statistics variables
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double delay_us_min = +INFINITY;
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double delay_us_max = -INFINITY;
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double delay_us_avg = 0.0;
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double peak_min = +INFINITY;
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double peak_max = -INFINITY;
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double peak_avg = 0.0;
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uint32_t count = 0;
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// Perform experiment for given a number of repetitions
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for (uint32_t rep = 0; rep < nof_repetitions; rep++) {
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// First transmission shall be flagged as start of burst
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bool is_start_of_burst = true;
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// For a the number of frames
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for (uint32_t nframe = 0; nframe < nof_frames; nframe++) {
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INFO("Rep %d. Receiving frame %d\n", rep, nframe);
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srslte_rf_recv_with_time(&rf, &buffer[flen * nframe], flen, true, &tstamp.full_secs, &tstamp.frac_secs);
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srslte_rf_recv_with_time(&rf, &buffer[flen * nframe], flen, true, &tstamp.full_secs, &tstamp.frac_secs);
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nframe++;
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if (nframe == 9 || nframe == 8) {
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srslte_timestamp_add(&tstamp, 0, tx_delay_ms * 1e-3 - timeadv * 1e-6);
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srslte_timestamp_add(&tstamp, 0, 2e-3 - timeadv * 1e-6);
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if (nframe == 10 - tx_delay_ms) {
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if (nframe == 8) {
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srslte_rf_send_timed2(&rf, preamble, flen, tstamp.full_secs, tstamp.frac_secs, false, !continous_tx);
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srslte_rf_send_timed2(&rf, zeros, flen, tstamp.full_secs, tstamp.frac_secs, true, false);
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INFO("Rep %d. Transmitting PRACH\n", rep);
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printf("Transmitting zeros\n");
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} else if (nframe == 10 - tx_delay_ms - 1 || continous_tx) {
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} else {
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srslte_rf_send_timed2(&rf, zeros, flen, tstamp.full_secs, tstamp.frac_secs, is_start_of_burst, false);
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srslte_rf_send_timed2(&rf, preamble, flen, tstamp.full_secs, tstamp.frac_secs, false, true);
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INFO("Rep %d. Transmitting Zeros\n", rep);
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printf("Transmitting PRACH\n");
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is_start_of_burst = false;
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}
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}
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}
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}
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}
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uint32_t indices[1024];
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// PRACH detection
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float offsets[1024];
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uint32_t indices[1024] = {};
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uint32_t nof_detected;
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float offsets[1024] = {};
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if (srslte_prach_detect_offset(
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float peak_to_avg[1024] = {};
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&prach, frequency_offset, &buffer[flen * 10 + prach.N_cp], flen, indices, offsets, NULL, &nof_detected)) {
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uint32_t nof_detected = 0;
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printf("Error detecting prach\n");
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if (srslte_prach_detect_offset(&prach,
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frequency_offset,
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&buffer[flen * 10 + prach.N_cp],
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flen,
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indices,
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offsets,
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peak_to_avg,
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&nof_detected)) {
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printf("Rep %d. Error detecting prach\n", rep);
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}
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}
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printf("Nof detected PRACHs: %d\n", nof_detected);
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// Prompt detected PRACH
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INFO("Rep %d. Nof detected PRACHs: %d\n", rep, nof_detected);
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for (int i = 0; i < nof_detected; i++) {
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for (int i = 0; i < nof_detected; i++) {
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printf("%d/%d index=%d, offset=%.2f us (%d samples)\n",
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INFO("%d/%d index=%d, offset=%.2f us (%d samples)\n",
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i,
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i,
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nof_detected,
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nof_detected,
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indices[i],
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indices[i],
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offsets[i] * 1e6,
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offsets[i] * 1e6,
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(int)(offsets[i] * srate));
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(int)(offsets[i] * srate));
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printf("%8.3f; %5d; %5d; %5d; %6.2f; %5d; %9.3f;\n",
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(double)(rep * nof_frames) * 1e-3,
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i + 1,
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nof_detected,
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indices[i],
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offsets[i] * 1e6,
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(int)(offsets[i] * srate),
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peak_to_avg[i]);
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// Update stats
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delay_us_min = SRSLTE_MIN(delay_us_min, offsets[i] * 1e6);
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delay_us_max = SRSLTE_MAX(delay_us_max, offsets[i] * 1e6);
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delay_us_avg = SRSLTE_VEC_CMA(offsets[i] * 1e6, delay_us_avg, count);
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peak_min = SRSLTE_MIN(peak_min, peak_to_avg[i]);
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peak_max = SRSLTE_MAX(peak_max, peak_to_avg[i]);
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peak_avg = SRSLTE_VEC_CMA(peak_to_avg[i], peak_avg, count);
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count++;
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}
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}
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// End burst
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if (continous_tx) {
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srslte_rf_send_timed2(&rf, zeros, 0, tstamp.full_secs, tstamp.frac_secs, false, true);
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}
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}
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srslte_vec_save_file(output_filename, buffer, 11 * flen * sizeof(cf_t));
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// Print statistics
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printf("\n");
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printf("Statistics:\n");
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printf(" PRACH count: %d\n", count);
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printf(" Minimum delay: %.2f us\n", delay_us_min);
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printf(" Maximum delay: %.2f us\n", delay_us_max);
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printf(" Average delay: %.2f us\n", delay_us_avg);
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printf(" Minimum peak: %.2f\n", peak_min);
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printf(" Maximum peak: %.2f\n", peak_max);
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printf(" Average peak: %.2f\n", peak_avg);
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// Save in file if filename is not empty
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if (output_filename) {
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// Save generated PRACH signal
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srslte_vec_save_file("generated", preamble, (prach.N_seq + prach.N_cp) * sizeof(cf_t));
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// Save last received buffer
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srslte_vec_save_file(output_filename, buffer, 11 * flen * (uint32_t)sizeof(cf_t));
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}
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srslte_rf_close(&rf);
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srslte_rf_close(&rf);
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srslte_prach_free(&prach);
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srslte_prach_free(&prach);
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