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Fix EMA cold-start for noise and SNR/RSSI measurements

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Initialize n0_subband_power and power control avg_snr/avg_rssi directly from the first measurement instead of starting from zero
This commit is contained in:
rmagueta
2026-04-16 14:50:13 +02:00
committed by Robert Schmidt
parent 5fcd456a46
commit aa5bd641fd
3 changed files with 10 additions and 1 deletions
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openair1/PHY/NR_ESTIMATION/nr_measurements_gNB.c
+4
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@@ -162,6 +162,7 @@ void gNB_I0_measurements(PHY_VARS_gNB *gNB, int slot, int first_symb, int num_sy
int32_t n0_subband_tot_perANT[frame_parms->nb_antennas_rx];
memset(n0_subband_tot_perANT, 0, sizeof(n0_subband_tot_perANT));
bool init_meas = measurements->n0_subband_power == NULL;
allocCast2D(n0_subband_power,
unsigned int,
measurements->n0_subband_power,
@@ -174,6 +175,9 @@ void gNB_I0_measurements(PHY_VARS_gNB *gNB, int slot, int first_symb, int num_sy
if (nb_symb[rb] > 0) {
for (int aarx = 0; aarx < frame_parms->nb_antennas_rx; aarx++) {
tmp_n0_subband[aarx][rb] /= nb_symb[rb];
// Initialize n0_subband_power from the first measurement before EMA
if (init_meas)
n0_subband_power[aarx][rb] = tmp_n0_subband[aarx][rb];
// apply exponential moving average to smooth noise measurements
n0_subband_power[aarx][rb] = 0.9 * n0_subband_power[aarx][rb] + 0.1 * tmp_n0_subband[aarx][rb];
n0_subband_tot_perPRB += n0_subband_power[aarx][rb];