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Automatic update of USRP RX gain during initial search using --agc option

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- if search fails, keeps increasing the rx gain (set by --ue-rxgain) by
  3 db until USRP max rx gain
- if initial sync is success, sets the rxgain to the value of
  (TARGET_RX_POWER (50) - pbch digital power in dB/RE)
This commit is contained in:
Raghavendra Dinavahi
2024-07-25 15:33:44 +02:00
committed by Robert Schmidt
parent 4c698bce2b
commit 95a8767383
10 changed files with 83 additions and 26 deletions
Download Patch File Download Diff File Expand all files Collapse all files
executables/nr-ue.c
+38 -5
View File
@@ -351,10 +351,31 @@ typedef struct {
int rx_offset;
} syncData_t;
static int nr_ue_adjust_rx_gain(PHY_VARS_NR_UE *UE, openair0_config_t *cfg0, int gain_change)
{
// Increase the RX gain by the value determined by adjust_rxgain
cfg0->rx_gain[0] += gain_change;
// Set new RX gain.
int ret_gain = UE->rfdevice.trx_set_gains_func(&UE->rfdevice, cfg0);
// APPLY RX gain again if crossed the MAX RX gain threshold
if (ret_gain < 0) {
gain_change += ret_gain;
cfg0->rx_gain[0] += ret_gain;
ret_gain = UE->rfdevice.trx_set_gains_func(&UE->rfdevice, cfg0);
}
int applied_rxgain = cfg0->rx_gain[0] - cfg0->rx_gain_offset[0];
LOG_I(PHY, "Rxgain adjusted by %d dB, RX gain: %d dB \n", gain_change, applied_rxgain);
return gain_change;
}
static void UE_synch(void *arg) {
syncData_t *syncD = (syncData_t *)arg;
PHY_VARS_NR_UE *UE = syncD->UE;
UE->is_synchronized = 0;
openair0_config_t *cfg0 = &openair0_cfg[UE->rf_map.card];
if (UE->target_Nid_cell != -1) {
LOG_W(NR_PHY, "Starting re-sync detection for target Nid_cell %i\n", UE->target_Nid_cell);
@@ -386,18 +407,30 @@ static void UE_synch(void *arg) {
// rerun with new cell parameters and frequency-offset
// todo: the freq_offset computed on DL shall be scaled before being applied to UL
nr_rf_card_config_freq(&openair0_cfg[UE->rf_map.card], ul_carrier, dl_carrier, freq_offset);
nr_rf_card_config_freq(cfg0, ul_carrier, dl_carrier, freq_offset);
if (get_nrUE_params()->agc) {
nr_ue_adjust_rx_gain(UE, cfg0, UE->adjust_rxgain);
}
LOG_I(PHY,
"Got synch: hw_slot_offset %d, carrier off %d Hz, rxgain %f (DL %f Hz, UL %f Hz)\n",
hw_slot_offset,
freq_offset,
openair0_cfg[UE->rf_map.card].rx_gain[0],
openair0_cfg[UE->rf_map.card].rx_freq[0],
openair0_cfg[UE->rf_map.card].tx_freq[0]);
cfg0->rx_gain[0] - cfg0->rx_gain_offset[0],
cfg0->rx_freq[0],
cfg0->tx_freq[0]);
UE->rfdevice.trx_set_freq_func(&UE->rfdevice, &openair0_cfg[0]);
UE->rfdevice.trx_set_freq_func(&UE->rfdevice, cfg0);
UE->is_synchronized = 1;
} else {
int gain_change = 0;
if (get_nrUE_params()->agc)
gain_change = nr_ue_adjust_rx_gain(UE, cfg0, INCREASE_IN_RXGAIN);
if (gain_change)
LOG_I(PHY, "synch retry: Rx gain increased \n");
else
LOG_E(PHY, "synch Failed: \n");
}
}