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merge timing_advance_offset and timing_advance_offset_ns computation

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This commit is contained in:
Rakesh Mundlamuri
2026-01-09 16:58:34 +05:30
parent b378acf2e0
commit 1b974c6ab2
7 changed files with 132 additions and 58 deletions
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openair1/SIMULATION/NR_PHY/srssim.c
+41 -10
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@@ -88,9 +88,8 @@ int main(int argc, char *argv[])
sigaction(SIGINT, &sigint_action, &oldaction);
double SNR, snr0 = 0, snr1 = 20.0;
double sum_srs_snr = 0;
double sigma, sigma_dB;
double snr_step = 5;
double snr_step = 1;
uint8_t snr1set = 0;
double **s_re, **s_im, **r_re, **r_im;
int trial, n_trials = 1, delay = 0;
@@ -128,7 +127,7 @@ int main(int argc, char *argv[])
InitSinLUT();
int c;
while ((c = getopt(argc, argv, "--:O:a:b:c:d:e:f:g:h:i:k:l:m:n:p:s:u:y:z:A:B:C:H:PR:S:L:")) != -1) {
while ((c = getopt(argc, argv, "--:O:a:b:c:d:e:f:g:h:i:kl:m:n:p:s:u:y:z:A:B:C:H:PR:S:L:")) != -1) {
/* ignore long options starting with '--', option '-O' and their arguments that are handled by configmodule */
/* with this opstring getopt returns 1 for non-option arguments, refer to 'man 3 getopt' */
if (c == 1 || c == '-' || c == 'O')
@@ -570,7 +569,8 @@ int main(int argc, char *argv[])
reset_meas(&gNB->srs_channel_estimation_stats);
reset_meas(&gNB->srs_timing_advance_stats);
sum_srs_snr = 0;
double sum_srs_snr = 0;
int tao_ns_count = 0;
for (trial = 0; trial < n_trials && !stop; trial++) {
// Estimate noise power from the transmitter level and SNR
sigma_dB = 10 * log10(((double)txlev_sum) * ((double)ofdm_symbol_size / (12 * srs_pdu.bwp_size))) - SNR;
@@ -627,6 +627,8 @@ int main(int argc, char *argv[])
uint8_t N_ap = 1 << srs->srs_pdu.num_ant_ports;
uint8_t nb_antennas_rx = fp->nb_antennas_rx;
int16_t snr_per_rb[srs->srs_pdu.bwp_size];
uint16_t timing_advance_offset;
int16_t timing_advance_offset_nsec[nb_antennas_rx];
int srs_est;
c16_t srs_estimated_channel_freq[nb_antennas_rx][N_ap][ofdm_symbol_size * N_symb_SRS] __attribute__((aligned(32)));
c16_t srs_estimated_channel_time[nb_antennas_rx][N_ap][ofdm_symbol_size] __attribute__((aligned(32)));
@@ -643,16 +645,41 @@ int main(int argc, char *argv[])
&srs_est,
srs_estimated_channel_freq,
srs_estimated_channel_time,
snr_per_rb);
snr_per_rb,
&timing_advance_offset,
timing_advance_offset_nsec);
start_meas(&gNB->srs_timing_advance_stats);
nr_est_timing_advance_srs(fp, srs_estimated_channel_time[0]);
stop_meas(&gNB->srs_timing_advance_stats);
sum_srs_snr += pow(10, (double)gNB->srs->snr / 10.0);
int16_t delay_ns = delay * 1e9 / (fp->samples_per_frame * 100);
for (int ant_idx = 0; ant_idx < nb_antennas_rx; ant_idx++) {
if (n_trials == 1)
printf("[RX ant %d] SRS estimated: TA offset %d, TA offset ns %d \n",
ant_idx,
timing_advance_offset,
timing_advance_offset_nsec[ant_idx]);
if (timing_advance_offset_nsec[ant_idx] == delay_ns)
tao_ns_count++;
}
stop_meas(&gNB->rx_srs_stats);
} // trail loop
sum_srs_snr /= n_trials;
printf("Actual SNR : %f, Estimated SNR from SRS %f (dB)\n", SNR, 10 * log10(sum_srs_snr));
float tao_ns_rate = (float)tao_ns_count / (n_trials * n_rx);
float SRS_SNR_dB = 10 * log10(sum_srs_snr / n_trials);
printf("Actual SNR : %f, Estimated SNR from SRS %f (dB), TA offset success rate %f %%\n", SNR, SRS_SNR_dB, tao_ns_rate * 100);
int srs_ret = 1;
if (SNR > 30 && SRS_SNR_dB > 30) {
srs_ret = 0;
} else if (SNR >= SRS_SNR_dB) {
srs_ret = SRS_SNR_dB >= 0.7 * SNR ? 0 : 1;
} else if (SRS_SNR_dB > SNR) {
srs_ret = SNR >= 0.7 * SRS_SNR_dB ? 0 : 1;
}
if (tao_ns_rate > 0.9 && srs_ret == 0) {
ret = 0;
break;
}
if (print_perf == 1) {
printf("\ngNB RX\n");
@@ -666,6 +693,10 @@ int main(int argc, char *argv[])
} // SNR loop
printf("*************\n");
printf("SRS test %s\n", ret == 0 ? "OK" : "FAILED");
printf("*************\n");
// free memory
for (i = 0; i < n_tx; i++) {