C++ (Cpp) pbch_put Examples

Example #1

File: pbch.c Project: immortaltw/libLTE

/** Converts the MIB message to symbols mapped to SLOT #1 ready for transmission
 */
void pbch_encode(pbch_t *q, pbch_mib_t *mib,
    cf_t *slot1_symbols[MAX_PORTS_CTRL], int nof_ports) {
  int i;
  int nof_bits = 2 * q->nof_symbols;

  assert(nof_ports <= MAX_PORTS_CTRL);

  /* Set pointers for layermapping & precoding */
  cf_t *x[MAX_LAYERS];

  /* number of layers equals number of ports */
  for (i = 0; i < nof_ports; i++) {
    x[i] = q->pbch_x[i];
  }
  memset(&x[nof_ports], 0, sizeof(cf_t*) * (MAX_LAYERS - nof_ports));

  if (q->frame_idx == 0) {
    /* pack MIB */
    pbch_mib_pack(mib, q->data);

    /* encode & modulate */
    crc_attach(&q->crc, q->data, 24);
    crc_set_mask(q->data, nof_ports);

    convcoder_encode(&q->encoder, q->data, q->data_enc, 40);

    rm_conv_tx(q->data_enc, 120, q->pbch_rm_b, 4 * nof_bits);

  }

  scrambling_b_offset(&q->seq_pbch, &q->pbch_rm_b[q->frame_idx * nof_bits],
      q->frame_idx * nof_bits, nof_bits);
  mod_modulate(&q->mod, &q->pbch_rm_b[q->frame_idx * nof_bits], q->pbch_d,
      nof_bits);

  /* layer mapping & precoding */
  if (nof_ports > 1) {
    layermap_diversity(q->pbch_d, x, nof_ports, q->nof_symbols);
    precoding_diversity(x, q->pbch_symbols, nof_ports,
        q->nof_symbols / nof_ports);
  } else {
    memcpy(q->pbch_symbols[0], q->pbch_d, q->nof_symbols * sizeof(cf_t));
  }

  /* mapping to resource elements */
  for (i = 0; i < nof_ports; i++) {
    pbch_put(q->pbch_symbols[i], slot1_symbols[i], q->nof_prb, q->cp,
        q->cell_id);
  }
  q->frame_idx++;
  if (q->frame_idx == 4) {
    q->frame_idx = 0;
  }
}

Example #2

File: pbch.c Project: SPLURGE831/libLTE

/** Converts the MIB message to symbols mapped to SLOT #1 ready for transmission
 */
int pbch_encode(pbch_t *q, pbch_mib_t *mib, cf_t *slot1_symbols[MAX_PORTS]) {
  int i;
  int nof_bits;
  cf_t *x[MAX_LAYERS];
  
  if (q                 != NULL &&
      mib               != NULL)
  {
    for (i=0;i<q->cell.nof_ports;i++) {
      if (slot1_symbols[i] == NULL) {
        return LIBLTE_ERROR_INVALID_INPUTS;
      } 
    }
    /* Set pointers for layermapping & precoding */
    nof_bits = 2 * q->nof_symbols;

    /* number of layers equals number of ports */
    for (i = 0; i < q->cell.nof_ports; i++) {
      x[i] = q->pbch_x[i];
    }
    memset(&x[q->cell.nof_ports], 0, sizeof(cf_t*) * (MAX_LAYERS - q->cell.nof_ports));
    
    if (q->frame_idx == 0) {
      /* pack MIB */
      pbch_mib_pack(mib, q->data);

      /* encode & modulate */
      crc_attach(&q->crc, q->data, 24);
      crc_set_mask(q->data, q->cell.nof_ports);

      convcoder_encode(&q->encoder, q->data, q->data_enc, 40);

      rm_conv_tx(q->data_enc, 120, q->pbch_rm_b, 4 * nof_bits);

    }

    scrambling_b_offset(&q->seq_pbch, &q->pbch_rm_b[q->frame_idx * nof_bits],
        q->frame_idx * nof_bits, nof_bits);
    mod_modulate(&q->mod, &q->pbch_rm_b[q->frame_idx * nof_bits], q->pbch_d,
        nof_bits);

    /* layer mapping & precoding */
    if (q->cell.nof_ports > 1) {
      layermap_diversity(q->pbch_d, x, q->cell.nof_ports, q->nof_symbols);
      precoding_diversity(x, q->pbch_symbols, q->cell.nof_ports,
          q->nof_symbols / q->cell.nof_ports);
    } else {
      memcpy(q->pbch_symbols[0], q->pbch_d, q->nof_symbols * sizeof(cf_t));
    }

    /* mapping to resource elements */
    for (i = 0; i < q->cell.nof_ports; i++) {
      pbch_put(q->pbch_symbols[i], slot1_symbols[i], q->cell);
    }
    q->frame_idx++;
    if (q->frame_idx == 4) {
      q->frame_idx = 0;
    }
    return LIBLTE_SUCCESS;
  } else {
    return LIBLTE_ERROR_INVALID_INPUTS;
  }
}