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Fix in atxlev computation in ulsim (the loop should be over nb_antennas_tx and not nb_antennas_rx) and remove wrong sigma_dB computation

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Roberto Louro Magueta
2022-04-26 20:25:53 +01:00
parent ac5444afd9
commit cb456a23cc
1 changed files with 1 additions and 4 deletions
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openair1/SIMULATION/NR_PHY/ulsim.c
+1 -4
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@@ -1224,7 +1224,7 @@ int main(int argc, char **argv)
////////////////////////////////////////////////////
tx_offset = frame_parms->get_samples_slot_timestamp(slot,frame_parms,0);
txlev_sum = 0;
for (int aa=0; aa<frame_parms->nb_antennas_rx; aa++) {
for (int aa=0; aa<frame_parms->nb_antennas_tx; aa++) {
atxlev[aa] = signal_energy(&UE->common_vars.txdata[aa][tx_offset + 5*frame_parms->ofdm_symbol_size + 4*frame_parms->nb_prefix_samples + frame_parms->nb_prefix_samples0],
frame_parms->ofdm_symbol_size + frame_parms->nb_prefix_samples);
@@ -1279,9 +1279,6 @@ int main(int argc, char **argv)
r_im[ap][i] += s_im[aa][i]*H_awgn[ap][aa];
}
}
sigma_dB = 10 * log10((double)atxlev[ap] * ((double)frame_parms->ofdm_symbol_size/(12*nb_rb))) - SNR;;
sigma = pow(10,sigma_dB/10);
((int16_t*) &gNB->common_vars.rxdata[ap][slot_offset])[(2*i) + (delay*2)] = (int16_t)((r_re[ap][i]) + (sqrt(sigma/2)*gaussdouble(0.0,1.0))); // convert to fixed point
((int16_t*) &gNB->common_vars.rxdata[ap][slot_offset])[(2*i)+1 + (delay*2)] = (int16_t)((r_im[ap][i]) + (sqrt(sigma/2)*gaussdouble(0.0,1.0)));