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@ -44,12 +44,13 @@ uint32_t preamble_format = 0;
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uint32_t root_seq_idx = 0;
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uint32_t seq_idx = 0;
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uint32_t frequency_offset = 0;
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uint32_t zero_corr_zone = 0;
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uint32_t zero_corr_zone = 11;
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uint32_t timeadv = 0;
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uint32_t nof_frames = 20;
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float uhd_gain=40, uhd_freq=2.4e9;
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char *uhd_args="";
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char *output_filename = NULL;
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char *output_filename = "prach_rx";
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void usage(char *prog) {
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printf("Usage: %s \n", prog);
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@ -58,15 +59,17 @@ void usage(char *prog) {
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printf("\t-g UHD TX/RX gain [Default %.1f dB]\n", uhd_gain);
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printf("\t-p Number of UL RB [Default %d]\n", nof_prb);
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printf("\t-F Preamble format [Default %d]\n", preamble_format);
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printf("\t-O Frequency offset [Default %d]\n", frequency_offset);
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printf("\t-s sequence index [Default %d]\n", seq_idx);
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printf("\t-r Root sequence index [Default %d]\n", root_seq_idx);
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printf("\t-t Time advance (us) [Default %d]\n", timeadv);
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printf("\t-z Zero correlation zone config [Default %d]\n", zero_corr_zone);
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printf("\t-o Save transmitted PRACH in file [Default no]\n");
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}
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void parse_args(int argc, char **argv) {
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int opt;
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while ((opt = getopt(argc, argv, "apfFgrsoz")) != -1) {
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while ((opt = getopt(argc, argv, "apfFgrstoPOz")) != -1) {
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switch (opt) {
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case 'a':
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uhd_args = argv[optind];
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@ -80,6 +83,15 @@ void parse_args(int argc, char **argv) {
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case 'g':
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uhd_gain = atof(argv[optind]);
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break;
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case 'P':
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preamble_format = atoi(argv[optind]);
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break;
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case 'O':
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frequency_offset = atoi(argv[optind]);
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break;
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case 't':
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timeadv = atoi(argv[optind]);
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break;
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case 'p':
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nof_prb = atoi(argv[optind]);
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if (!srslte_nofprb_isvalid(nof_prb)) {
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@ -123,7 +135,8 @@ int main(int argc, char **argv) {
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high_speed_flag,
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zero_corr_zone);
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uint32_t flen = srslte_sampling_freq_hz(nof_prb)/1000;
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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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bzero(preamble, flen*sizeof(cf_t));
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@ -133,7 +146,7 @@ int main(int argc, char **argv) {
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preamble);
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uint32_t prach_len = p->N_seq;
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uint32_t prach_len = p->N_seq+p->N_cp;
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srslte_vec_save_file("generated",preamble,prach_len*sizeof(cf_t));
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@ -147,11 +160,27 @@ int main(int argc, char **argv) {
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exit(-1);
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}
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printf("Subframe len: %d samples\n", flen);
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printf("Set TX/RX rate: %.2f MHz\n", srslte_rf_set_rx_srate(&uhd, srslte_sampling_freq_hz(nof_prb)) / 1000000);
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printf("Set RX gain: %.1f dB\n", srslte_rf_set_rx_gain(&uhd, uhd_gain));
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printf("Set TX gain: %.1f dB\n", srslte_rf_set_tx_gain(&uhd, uhd_gain));
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printf("Set TX/RX freq: %.2f MHz\n", srslte_rf_set_rx_freq(&uhd, uhd_freq) / 1000000);
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srslte_rf_set_tx_srate(&uhd, srslte_sampling_freq_hz(nof_prb));
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printf("Set RX gain: %.1f dB\n", uhd_gain);
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printf("Set TX gain: %.1f dB\n", 20+uhd_gain);
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printf("Set TX/RX freq: %.2f MHz\n", uhd_freq/ 1000000);
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srslte_rf_set_rx_gain(&uhd, uhd_gain);
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srslte_rf_set_tx_gain(&uhd, 10+uhd_gain);
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srslte_rf_set_rx_freq(&uhd, uhd_freq);
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srslte_rf_set_tx_freq(&uhd, uhd_freq);
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if (srate < 10e6) {
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srslte_rf_set_master_clock_rate(&uhd, 4*srate);
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} else {
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srslte_rf_set_master_clock_rate(&uhd, srate);
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}
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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(&uhd, (double) srate);
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if (srate_rf != srate) {
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fprintf(stderr, "Could not set sampling rate\n");
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exit(-1);
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}
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srslte_rf_set_tx_srate(&uhd, (double) srate);
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sleep(1);
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cf_t *zeros = calloc(sizeof(cf_t),flen);
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@ -171,7 +200,7 @@ int main(int argc, char **argv) {
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srslte_rf_recv_with_time(&uhd, &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, 2e-3);
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srslte_timestamp_add(&tstamp, 0, 2e-3-timeadv*1e-6);
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if (nframe==8) {
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srslte_rf_send_timed2(&uhd, zeros, flen, tstamp.full_secs, tstamp.frac_secs, true, false);
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printf("Transmitting zeros\n");
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@ -183,7 +212,7 @@ int main(int argc, char **argv) {
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}
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if (f) {
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fwrite(&buffer[10*flen], flen*sizeof(cf_t), 1, f);
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fwrite(buffer, 11*flen*sizeof(cf_t), 1, f);
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}
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if (f) {
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fclose(f);
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Ismael Gomez
9 years ago