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Adding AWGN channel to txdata

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This commit is contained in:
Khalid Ahmed
2019-06-04 13:42:05 +02:00
committed by Thomas Schlichter
parent 9edbe82dc8
commit d9e077ead0
2 changed files with 34 additions and 17 deletions
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openair1/PHY/INIT/nr_init.c
+5 -3
View File
@@ -156,12 +156,14 @@ int phy_init_nr_gNB(PHY_VARS_gNB *gNB,
gNB->first_run_I0_measurements =
1; ///This flag used to be static. With multiple gNBs this does no longer work, hence we put it in the structure. However it has to be initialized with 1, which is performed here.
common_vars->rxdata = (int32_t **)NULL;
common_vars->rxdata = (int32_t **)malloc16(15*sizeof(int32_t*));
common_vars->txdataF = (int32_t **)malloc16(15*sizeof(int32_t*));
common_vars->rxdataF = (int32_t **)malloc16(64*sizeof(int32_t*));
common_vars->rxdataF = (int32_t **)malloc16(15*sizeof(int32_t*));
for (i=0;i<15;i++){
common_vars->txdataF[i] = (int32_t*)malloc16_clear(fp->samples_per_frame_wCP*sizeof(int32_t) ); // [hna] samples_per_frame without CP
common_vars->txdataF[i] = (int32_t*)malloc16_clear(fp->samples_per_frame_wCP*sizeof(int32_t)); // [hna] samples_per_frame without CP
common_vars->rxdataF[i] = (int32_t*)malloc16_clear(fp->samples_per_frame_wCP*sizeof(int32_t));
common_vars->rxdata[i] = (int32_t*)malloc16_clear(fp->samples_per_frame*sizeof(int32_t));
LOG_D(PHY,"[INIT] common_vars->txdataF[%d] = %p (%lu bytes)\n",
i,common_vars->txdataF[i],
openair1/SIMULATION/NR_PHY/ulsim.c
+29 -14
View File
@@ -129,12 +129,13 @@ int main(int argc, char **argv) {
char c;
int i,sf;
double SNR, SNR_lin, snr0 = -2.0, snr1 = 2.0;
double sigma2, sigma2_dB;
double snr_step = 0.1;
uint8_t snr1set = 0;
int slot = 0;
int **txdata;
int32_t **txdataF;
double **s_re, **s_im, **r_re, **r_im;
double **r_re, **r_im;
FILE *output_fd = NULL;
//uint8_t write_output_file = 0;
int trial, n_trials = 1, n_errors = 0, n_false_positive = 0;
@@ -395,17 +396,11 @@ int main(int argc, char **argv) {
frame_length_complex_samples = frame_parms->samples_per_subframe;
//frame_length_complex_samples_no_prefix = frame_parms->samples_per_subframe_wCP;
s_re = malloc(2 * sizeof(double *));
s_im = malloc(2 * sizeof(double *));
r_re = malloc(2 * sizeof(double *));
r_im = malloc(2 * sizeof(double *));
txdata = malloc(2 * sizeof(int * ));
for (i = 0; i < 2; i++) {
s_re[i] = malloc(frame_length_complex_samples * sizeof(double));
bzero(s_re[i], frame_length_complex_samples * sizeof(double));
s_im[i] = malloc(frame_length_complex_samples * sizeof(double));
bzero(s_im[i], frame_length_complex_samples * sizeof(double));
r_re[i] = malloc(frame_length_complex_samples * sizeof(double));
bzero(r_re[i], frame_length_complex_samples * sizeof(double));
r_im[i] = malloc(frame_length_complex_samples * sizeof(double));
@@ -710,10 +705,29 @@ m, l, k, ((int16_t*)txdataF[ap])[(sample_offsetF)<<1],
///////////
////////////////////////////////////////////////////
for (i=0; i<frame_length_complex_samples; i++) {
for (ap=0; ap<frame_parms->nb_antennas_tx; ap++) {
r_re[ap][i] = ((double)(((short *)txdata[ap]))[(i<<1)]);
r_im[ap][i] = ((double)(((short *)txdata[ap]))[(i<<1)+1]);
}
}
txlev = signal_energy(&txdata[0][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);
for (SNR = snr0; SNR < snr1; SNR += snr_step) {
n_errors = 0;
n_false_positive = 0;
SNR_lin = pow(10, SNR / 10.0);
sigma = 1.0 / sqrt(2 * SNR_lin);
//AWGN
sigma2_dB = 10*log10((double)txlev)-SNR;
sigma2 = pow(10,sigma2_dB/10);
for (trial = 0; trial < n_trials; trial++) {
@@ -722,6 +736,13 @@ m, l, k, ((int16_t*)txdataF[ap])[(sample_offsetF)<<1],
errors_bit = 0;
scrambling_index = 0;
for (i=0; i<frame_length_complex_samples; i++) {
for (ap=0; ap<frame_parms->nb_antennas_rx; ap++) {
((short*) gNB->common_vars.rxdata[ap])[2*i] = (short) ((r_re[ap][i] + sqrt(sigma2/2)*gaussdouble(0.0,1.0)));
((short*) gNB->common_vars.rxdata[ap])[2*i+1] = (short) ((r_im[ap][i] + sqrt(sigma2/2)*gaussdouble(0.0,1.0)));
}
}
for (i = 0; i < available_bits; i++) {
#ifdef DEBUG_CODER
@@ -746,9 +767,7 @@ m, l, k, ((int16_t*)txdataF[ap])[(sample_offsetF)<<1],
modulated_input[i] = -1.0; ///sqrt(2);
////////////////////////////////////////////
SNR_lin = pow(10, SNR / 10.0);
sigma = 1.0 / sqrt(2 * SNR_lin);
#if 1
channel_output_fixed[i] = (short) quantize(sigma / 4.0 / 4.0,
modulated_input[i] + sigma * gaussdouble(0.0, 1.0),
@@ -870,15 +889,11 @@ m, l, k, ((int16_t*)txdataF[ap])[(sample_offsetF)<<1],
}
for (i = 0; i < 2; i++) {
free(s_re[i]);
free(s_im[i]);
free(r_re[i]);
free(r_im[i]);
free(txdata[i]);
}
free(s_re);
free(s_im);
free(r_re);
free(r_im);
free(txdata);