C++ (Cpp) srslte_ue_mib_sync_decode示例

示例#1

文件： rf_utils.c 项目： andrepuschmann/srsLTE

/** This function is simply a wrapper to the ue_cell_search module for rf devices 
 * Return 1 if the MIB is decoded, 0 if not or -1 on error. 
 */
int rf_mib_decoder(srslte_rf_t *rf, uint32_t nof_rx_antennas,cell_search_cfg_t *config, srslte_cell_t *cell, float *cfo) {
  int ret = SRSLTE_ERROR; 
  srslte_ue_mib_sync_t ue_mib; 
  uint8_t bch_payload[SRSLTE_BCH_PAYLOAD_LEN];

  if (srslte_ue_mib_sync_init_multi(&ue_mib, srslte_rf_recv_wrapper_cs, nof_rx_antennas, (void*) rf)) {
    fprintf(stderr, "Error initiating srslte_ue_mib_sync\n");
    goto clean_exit; 
  }

  if (srslte_ue_mib_sync_set_cell(&ue_mib, cell->id, cell->cp)) {
    fprintf(stderr, "Error initiating srslte_ue_mib_sync\n");
    goto clean_exit;
  }

  int srate = srslte_sampling_freq_hz(SRSLTE_UE_MIB_NOF_PRB);
  INFO("Setting sampling frequency %.2f MHz for PSS search\n", (float) srate/1000000);
  srslte_rf_set_rx_srate(rf, (float) srate);
  
  INFO("Starting receiver...\n");
  srslte_rf_start_rx_stream(rf, false);

  // Copy CFO estimate if provided and disable CP estimation during find
  if (cfo) {
    ue_mib.ue_sync.cfo_current_value = *cfo/15000;
    ue_mib.ue_sync.cfo_is_copied = true;
    ue_mib.ue_sync.cfo_correct_enable_find = true;
    srslte_sync_set_cfo_cp_enable(&ue_mib.ue_sync.sfind, false, 0);
  }

  /* Find and decode MIB */
  ret = srslte_ue_mib_sync_decode(&ue_mib, config->max_frames_pbch, bch_payload, &cell->nof_ports, NULL); 
  if (ret < 0) {
    fprintf(stderr, "Error decoding MIB\n");
    goto clean_exit; 
  }
  if (ret == 1) {
    srslte_pbch_mib_unpack(bch_payload, cell, NULL);
  }
  
  // Save CFO 
  if (cfo) {
    *cfo = srslte_ue_sync_get_cfo(&ue_mib.ue_sync);
  }
  
clean_exit: 

  srslte_rf_stop_rx_stream(rf);
  srslte_ue_mib_sync_free(&ue_mib);

  return ret; 
}

示例#2

文件： cuhd_utils.c 项目： CodaCarlson/srsLTE

/** This function is simply a wrapper to the ue_cell_search module for cuhd devices 
 * Return 1 if the MIB is decoded, 0 if not or -1 on error. 
 */
int cuhd_mib_decoder(void *uhd, cell_search_cfg_t *config, srslte_cell_t *cell) {
  int ret = SRSLTE_ERROR; 
  srslte_ue_mib_sync_t ue_mib; 
  uint8_t bch_payload[SRSLTE_BCH_PAYLOAD_LEN];

  if (srslte_ue_mib_sync_init(&ue_mib, cell->id, cell->cp, cuhd_recv_wrapper_cs, uhd)) {
    fprintf(stderr, "Error initiating srslte_ue_mib_sync\n");
    goto clean_exit; 
  }
  
  if (config->init_agc > 0) {
    srslte_ue_sync_start_agc(&ue_mib.ue_sync, cuhd_set_rx_gain_th, config->init_agc);    
  }

  int srate = srslte_sampling_freq_hz(SRSLTE_UE_MIB_NOF_PRB);
  INFO("Setting sampling frequency %.2f MHz for PSS search\n", (float) srate/1000000);
  cuhd_set_rx_srate(uhd, (float) srate);
  
  INFO("Starting receiver...\n", 0);
  cuhd_start_rx_stream(uhd);
    
  /* Find and decody MIB */
  ret = srslte_ue_mib_sync_decode(&ue_mib, config->max_frames_pss, bch_payload, &cell->nof_ports, NULL); 
  if (ret < 0) {
    fprintf(stderr, "Error decoding MIB\n");
    goto clean_exit; 
  }
  if (ret == 1) {
    srslte_pbch_mib_unpack(bch_payload, cell, NULL);
  }

  // Save AGC value 
  if (config->init_agc > 0) {
    config->init_agc = srslte_agc_get_gain(&ue_mib.ue_sync.agc);
  }

clean_exit: 

  cuhd_stop_rx_stream(uhd);
  srslte_ue_mib_sync_free(&ue_mib);

  return ret; 
}