Beispiel #1
0
int main(int argc, char **argv) {
  int N_id_2, ns, find_ns;
  cf_t *buffer, *fft_buffer;
  cf_t pss_signal[PSS_LEN];
  float sss_signal0[SSS_LEN]; // for subframe 0
  float sss_signal5[SSS_LEN]; // for subframe 5
  int cid, max_cid; 
  uint32_t find_idx;
  sync_t sync;
  lte_fft_t ifft;

  parse_args(argc, argv);

  buffer = malloc(sizeof(cf_t) * FLEN);
  if (!buffer) {
    perror("malloc");
    exit(-1);
  }

  fft_buffer = malloc(sizeof(cf_t) * 2 * FLEN);
  if (!fft_buffer) {
    perror("malloc");
    exit(-1);
  }

  if (lte_ifft_init(&ifft, cp, 6)) {
    fprintf(stderr, "Error creating iFFT object\n");
    exit(-1);
  }

  if (sync_init(&sync, FLEN, 128, 128)) {
    fprintf(stderr, "Error initiating PSS/SSS\n");
    return -1;
  }

  sync_set_threshold(&sync, 1, 1);

  if (cell_id == -1) {
    cid = 0;
    max_cid = 49;
  } else {
    cid = cell_id;
    max_cid = cell_id;
}
  while(cid <= max_cid) {
    N_id_2 = cid%3;

    /* Generate PSS/SSS signals */
    pss_generate(pss_signal, N_id_2);
    sss_generate(sss_signal0, sss_signal5, cid);

    for (ns=0;ns<2;ns++) {
      memset(buffer, 0, sizeof(cf_t) * FLEN);
      pss_put_slot(pss_signal, buffer, 6, cp);
      sss_put_slot(ns?sss_signal5:sss_signal0, buffer, 6, cp);

      /* Transform to OFDM symbols */
      memset(fft_buffer, 0, sizeof(cf_t) * 2 * FLEN);
      lte_ifft_run_slot(&ifft, buffer, &fft_buffer[offset]);

      sync_find(&sync, fft_buffer, &find_idx);
      find_ns = sync_get_slot_id(&sync);
      printf("cell_id: %d find: %d, offset: %d, ns=%d find_ns=%d\n", cid, find_idx, offset,
          ns, find_ns);
      if (find_idx != offset + 960) {
        printf("offset != find_offset: %d != %d\n", find_idx, offset + 960);
        exit(-1);
      }
      if (ns*10 != find_ns) {
        printf("ns != find_ns\n", 10 * ns, find_ns);
        exit(-1);
      }
      if (sync_get_cp(&sync) != cp) {
        printf("Detected CP should be %s\n", CP_ISNORM(cp)?"Normal":"Extended");
        exit(-1);
      }
    }
    cid++;
  }

  free(fft_buffer);
  free(buffer);

  sync_free(&sync);
  lte_ifft_free(&ifft);

  printf("Ok\n");
  exit(0);
}
Beispiel #2
0
int main(int argc, char **argv) {
  int nf, sf_idx, N_id_2;
  cf_t pss_signal[PSS_LEN];
  float sss_signal0[SSS_LEN]; // for subframe 0
  float sss_signal5[SSS_LEN]; // for subframe 5
  pbch_mib_t mib;
  ra_pdsch_t ra_dl;
  ra_prb_t prb_alloc;
  refsignal_t refs[NSLOTS_X_FRAME];
  int i, n;
  char *data;
  cf_t *sf_symbols[MAX_PORTS];
  dci_msg_t dci_msg;
  dci_location_t locations[NSUBFRAMES_X_FRAME][10];

#ifdef DISABLE_UHD
  if (argc < 3) {
    usage(argv[0]);
    exit(-1);
  }
#endif

  parse_args(argc, argv);

  N_id_2 = cell.id % 3;
  sf_n_re = 2 * CPNORM_NSYMB * cell.nof_prb * RE_X_RB;
  sf_n_samples = 2 * SLOT_LEN(lte_symbol_sz(cell.nof_prb));

  /* this *must* be called after setting slot_len_* */
  base_init();

  /* Generate PSS/SSS signals */
  pss_generate(pss_signal, N_id_2);
  sss_generate(sss_signal0, sss_signal5, cell.id);
  
  /* Generate CRS signals */
  for (i = 0; i < NSLOTS_X_FRAME; i++) {
    if (refsignal_init_LTEDL(&refs[i], 0, i, cell)) {
      fprintf(stderr, "Error initiating CRS slot=%d\n", i);
      return -1;
    }
  }

  mib.nof_ports = cell.nof_ports;
  mib.nof_prb = cell.nof_prb;
  mib.phich_length = PHICH_NORM;
  mib.phich_resources = R_1;
  mib.sfn = 0;

  for (i = 0; i < MAX_PORTS; i++) { // now there's only 1 port
    sf_symbols[i] = sf_buffer;
  }

#ifndef DISABLE_UHD
  if (!output_file_name) {
    printf("Set TX rate: %.2f MHz\n",
        cuhd_set_tx_srate(uhd, lte_sampling_freq_hz(cell.nof_prb)) / 1000000);
    printf("Set TX gain: %.1f dB\n", cuhd_set_tx_gain(uhd, uhd_gain));
    printf("Set TX freq: %.2f MHz\n",
        cuhd_set_tx_freq(uhd, uhd_freq) / 1000000);
  }
#endif

  bzero(&ra_dl, sizeof(ra_pdsch_t));
  ra_dl.harq_process = 0;
  ra_dl.mcs_idx = mcs_idx;
  ra_dl.ndi = 0;
  ra_dl.rv_idx = 0;
  ra_dl.alloc_type = alloc_type0;
  ra_dl.type0_alloc.rbg_bitmask = 0xffffffff;
  
  dci_msg_pack_pdsch(&ra_dl, &dci_msg, Format1, cell.nof_prb, false);
  
  ra_prb_get_dl(&prb_alloc, &ra_dl, cell.nof_prb);
  ra_prb_get_re_dl(&prb_alloc, cell.nof_prb, 1, cell.nof_prb<10?(cfi+1):cfi, CPNORM);
  ra_mcs_from_idx_dl(mcs_idx, cell.nof_prb, &ra_dl.mcs);

  ra_pdsch_fprint(stdout, &ra_dl, cell.nof_prb);
  
  /* Initiate valid DCI locations */
  for (i=0;i<NSUBFRAMES_X_FRAME;i++) {
    pdcch_ue_locations(&pdcch, locations[i], 10, i, cfi, 1234);
  }

  data = malloc(sizeof(char) * ra_dl.mcs.tbs);
  if (!data) {
    perror("malloc");
    exit(-1);
  }  
    
  nf = 0;
  
  if (pdsch_harq_setup(&harq_process, ra_dl.mcs, &prb_alloc)) {
    fprintf(stderr, "Error configuring HARQ process\n");
    exit(-1);
  }

  while (nf < nof_frames || nof_frames == -1) {
    for (sf_idx = 0; sf_idx < NSUBFRAMES_X_FRAME && (nf < nof_frames || nof_frames == -1); sf_idx++) {
      bzero(sf_buffer, sizeof(cf_t) * sf_n_re);

      if (sf_idx == 0 || sf_idx == 5) {
        pss_put_slot(pss_signal, sf_buffer, cell.nof_prb, CPNORM);
        sss_put_slot(sf_idx ? sss_signal5 : sss_signal0, sf_buffer, cell.nof_prb,
            CPNORM);
      }
      
      if (sf_idx == 0) {
        pbch_encode(&pbch, &mib, sf_symbols);
      }
    
      for (n=0;n<2;n++) {
        refsignal_put(&refs[2*sf_idx+n], &sf_buffer[n*sf_n_re/2]);
      }

      pcfich_encode(&pcfich, cfi, sf_symbols, sf_idx);       

      INFO("SF: %d, Generating %d random bits\n", sf_idx, ra_dl.mcs.tbs);
      for (i=0;i<ra_dl.mcs.tbs;i++) {
        data[i] = rand()%2;
      }
      
      INFO("Puttting DCI to location: n=%d, L=%d\n", locations[sf_idx][0].ncce, locations[sf_idx][0].L);
      if (pdcch_encode(&pdcch, &dci_msg, locations[sf_idx][0], 1234, sf_symbols, sf_idx, cfi)) {
        fprintf(stderr, "Error encoding DCI message\n");
        exit(-1);
      }
      
      if (pdsch_encode(&pdsch, data, sf_symbols, sf_idx, &harq_process, ra_dl.rv_idx)) {
        fprintf(stderr, "Error encoding PDSCH\n");
        exit(-1);
      }

      /* Transform to OFDM symbols */
      lte_ifft_run_sf(&ifft, sf_buffer, output_buffer);
      
      /* send to file or usrp */
      if (output_file_name) {
        filesink_write(&fsink, output_buffer, sf_n_samples);
        usleep(5000);
      } else {
#ifndef DISABLE_UHD
        vec_sc_prod_cfc(output_buffer, uhd_amp, output_buffer, sf_n_samples);
        cuhd_send(uhd, output_buffer, sf_n_samples, true);
#endif
      }
      nf++;
    }
    mib.sfn = (mib.sfn + 1) % 1024;
    printf("SFN: %4d\r", mib.sfn);
    fflush(stdout);
  }

  base_free();

  printf("Done\n");
  exit(0);
}
Beispiel #3
0
int main(int argc, char **argv) {
	int nf, ns, N_id_2;
	cf_t pss_signal[PSS_LEN];
	float sss_signal0[SSS_LEN]; // for subframe 0
	float sss_signal5[SSS_LEN]; // for subframe 5
	pbch_mib_t mib;
	refsignal_t refs[NSLOTS_X_FRAME];
	int i;
	cf_t *slot1_symbols[MAX_PORTS_CTRL];


#ifdef DISABLE_UHD
	if (argc < 3) {
		usage(argv[0]);
		exit(-1);
	}
#endif

	parse_args(argc,argv);

	N_id_2 = cell_id%3;
	slot_n_re = CPNORM_NSYMB * nof_prb * RE_X_RB;
	slot_n_samples = SLOT_LEN_CPNORM(lte_symbol_sz(nof_prb));

	/* this *must* be called after setting slot_len_* */
	base_init();

	/* Generate PSS/SSS signals */
	pss_generate(pss_signal, N_id_2);
	sss_generate(sss_signal0, sss_signal5, cell_id);

	/* Generate CRS signals */
	for (i=0;i<NSLOTS_X_FRAME;i++) {
		if (refsignal_init_LTEDL(&refs[i], 0, i, cell_id, CPNORM, nof_prb)) {
			fprintf(stderr, "Error initiating CRS slot=%d\n", i);
			return -1;
		}
	}

	mib.nof_ports = 1;
	mib.nof_prb = 6;
	mib.phich_length = PHICH_NORM;
	mib.phich_resources = R_1;
	mib.sfn = 0;

	for (i=0;i<MAX_PORTS_CTRL;i++) { // now there's only 1 port
		slot1_symbols[i] = slot_buffer;
	}

#ifndef DISABLE_UHD
	if (!output_file_name) {
		printf("Set TX rate: %.2f MHz\n", cuhd_set_tx_srate(uhd, UHD_SAMP_FREQ)/1000000);
		printf("Set TX gain: %.1f dB\n", cuhd_set_tx_gain(uhd, uhd_gain));
		printf("Set TX freq: %.2f MHz\n", cuhd_set_tx_freq(uhd, uhd_freq)/1000000);
	}
#endif

	nf = 0;

	while(nf<nof_frames || nof_frames == -1) {
		for (ns=0;ns<NSLOTS_X_FRAME;ns++) {
			bzero(slot_buffer, sizeof(cf_t) * slot_n_re);

			switch(ns) {
			case 0: // tx pss/sss
			case 10: // tx pss/sss
				pss_put_slot(pss_signal, slot_buffer, nof_prb, CPNORM);
				sss_put_slot(ns?sss_signal5:sss_signal0, slot_buffer, nof_prb, CPNORM);
				break;
			case 1: // tx pbch
				pbch_encode(&pbch, &mib, slot1_symbols, 1);
				break;
			default: // transmit zeros
				break;
			}

			refsignal_put(&refs[ns], slot_buffer);

			/* Transform to OFDM symbols */
			lte_ifft_run(&ifft, slot_buffer, output_buffer);

			/* send to file or usrp */
			if (output_file_name) {
				filesink_write(&fsink, output_buffer, slot_n_samples);
				usleep(5000);
			} else {
#ifndef DISABLE_UHD
				vec_sc_prod_cfc(output_buffer, uhd_amp, output_buffer, slot_n_samples);
				cuhd_send(uhd, output_buffer, slot_n_samples, 1);
#endif
			}
		}
		mib.sfn=(mib.sfn+1)%1024;
		printf("SFN: %4d\r", mib.sfn);fflush(stdout);
		nf++;
	}

	base_free();

	printf("Done\n");
	exit(0);
}