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Adding AWGN noise to ulsim

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This commit is contained in:
Khalid Ahmed
2019-06-04 13:43:19 +02:00
committed by Thomas Schlichter
parent 02e329a35d
commit b1c6538783
2 changed files with 11 additions and 9 deletions
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openair1/PHY/NR_UE_TRANSPORT/nr_ulsch_ue.c
+1 -1
View File
@@ -62,7 +62,7 @@ int generate_ue_ulsch_params(PHY_VARS_NR_UE *UE,
n_rnti = 0x1234;
Nid_cell = 0;
nb_rb = 50;
first_rb = 90;
first_rb = 30;
Nsymb_pusch = 12;
nb_codewords = (ul_dci_pdu->precod_nbr_layers>4)?2:1;
//------------------------------------------------------------------------------//
openair1/SIMULATION/NR_PHY/ulsim.c
+10 -8
View File
@@ -166,7 +166,8 @@ int main(int argc, char **argv) {
int gNB_id = 0;
int ap;
int tx_offset;
double txlev;
double txlev_float;
int32_t txlev;
int start_rb = 30;
int UE_id =0; // [hna] only works for UE_id = 0 because NUMBER_OF_NR_UE_MAX is set to 1 (phy_init_nr_gNB causes segmentation fault)
@@ -488,10 +489,12 @@ int main(int argc, char **argv) {
////////////////////////////////////////////////////
tx_offset = slot*frame_parms->samples_per_slot;
txlev = (double) signal_energy_amp_shift(&UE->common_vars.txdata[0][tx_offset + 5*frame_parms->ofdm_symbol_size + 4*frame_parms->nb_prefix_samples + frame_parms->nb_prefix_samples0],
txlev = signal_energy_amp_shift(&UE->common_vars.txdata[0][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);
txlev = txlev/(double)AMP; // output of signal_energy is fixed point representation
txlev_float = (double)txlev/(double)AMP; // output of signal_energy is fixed point representation
printf("\n");
@@ -501,9 +504,9 @@ int main(int argc, char **argv) {
n_false_positive = 0;
//AWGN
sigma_dB = 10*log10((double)txlev)-SNR;
sigma_dB = 10*log10(txlev_float)-SNR;
sigma = pow(10,sigma_dB/10);
for (trial = 0; trial < n_trials; trial++) {
errors_scrambling = 0;
@@ -511,10 +514,9 @@ int main(int argc, char **argv) {
for (i=0; i<frame_length_complex_samples; i++) {
for (ap=0; ap<frame_parms->nb_antennas_rx; ap++) {
// [hna] doesn't work with noise in case of mod_order = 6
((short*) gNB->common_vars.rxdata[ap])[2*i] = (((int16_t *)UE->common_vars.txdata[ap])[(i<<1)]);// + (int16_t)(sqrt(sigma/2)*gaussdouble(0.0,1.0)*(double)AMP)); // convert to fixed point
((short*) gNB->common_vars.rxdata[ap])[2*i+1] = (((int16_t *)UE->common_vars.txdata[ap])[(i<<1)+1]);// + (int16_t)(sqrt(sigma/2)*gaussdouble(0.0,1.0)*(double)AMP));
((short*) gNB->common_vars.rxdata[ap])[2*i] = (((int16_t *)UE->common_vars.txdata[ap])[(i<<1)])+ (int16_t)(sqrt(sigma/2)*gaussdouble(0.0,1.0)*(double)AMP); // convert to fixed point
((short*) gNB->common_vars.rxdata[ap])[2*i+1] = (((int16_t *)UE->common_vars.txdata[ap])[(i<<1)+1])+ (int16_t)(sqrt(sigma/2)*gaussdouble(0.0,1.0)*(double)AMP);
}
}