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fixes for TDL channel models in nr_ulsim

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This commit is contained in:
Raymond Knopp
2020-08-13 09:43:50 +02:00
parent ae4f3320c7
commit 49a14c4f9f
5 changed files with 140 additions and 114 deletions
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openair1/SIMULATION/NR_PHY/ulsim.c
+117 -101
View File
@@ -127,7 +127,7 @@ int main(int argc, char **argv)
double *r_re[4]= {r_re0,r_re1,r_re2,r_re3};
double *r_im[4]= {r_im0,r_im1,r_im2,r_im3};
//uint8_t write_output_file = 0;
int trial, n_trials = 1, n_errors = 0, n_false_positive = 0, delay = 0;
int trial, n_trials = 1, n_false_positive = 0, delay = 0;
double maxDoppler = 0.0;
uint8_t n_tx = 1, n_rx = 1;
//uint8_t transmission_mode = 1;
@@ -170,7 +170,7 @@ int main(int argc, char **argv)
UE_nr_rxtx_proc_t UE_proc;
FILE *scg_fd=NULL;
double TDL_DS = 30e-9;
double DS_TDL = .03;
int ibwps=24;
int ibwp_rboffset=41;
@@ -253,17 +253,17 @@ int main(int argc, char **argv)
case 'H':
channel_model = TDL_C;
TDL_DS = 30e-9;
DS_TDL = .030; // 30 ns
break;
case 'I':
channel_model = TDL_C;
TDL_DS = 300e-9;
DS_TDL = .3; // 300ns
break;
case 'J':
channel_model=TDL_D;
TDL_DS = 30e-9;
DS_TDL = .03;
break;
default:
@@ -435,19 +435,20 @@ int main(int argc, char **argv)
double sampling_frequency;
double bandwidth;
if (N_RB_UL >= 217) sampling_frequency = 122.88e6;
else if (N_RB_UL >= 106) sampling_frequency = 61.44e6;
if (N_RB_UL >= 217) sampling_frequency = 122.88;
else if (N_RB_UL >= 106) sampling_frequency = 61.44;
else { printf("Need at least 106 PRBs\b"); exit(-1); }
if (N_RB_UL == 273) bandwidth = 100e6;
else if (N_RB_UL == 217) bandwidth = 80e6;
else if (N_RB_UL == 106) bandwidth = 40e6;
if (N_RB_UL == 273) bandwidth = 100;
else if (N_RB_UL == 217) bandwidth = 80;
else if (N_RB_UL == 106) bandwidth = 40;
else { printf("Add N_RB_UL %d\n",N_RB_UL); exit(-1); }
if (openair0_cfg[0].threequarter_fs == 1) sampling_frequency*=.75;
UE2gNB = new_channel_desc_scm(n_tx, n_rx, channel_model,
sampling_frequency,
bandwidth,
TDL_DS,
DS_TDL,
0, 0, 0);
UE2gNB->max_Doppler = maxDoppler;
@@ -588,7 +589,7 @@ int main(int argc, char **argv)
unsigned char *estimated_output_bit;
unsigned char *test_input_bit;
uint32_t errors_decoding = 0;
uint32_t errors_scrambling = 0;
test_input_bit = (unsigned char *) malloc16(sizeof(unsigned char) * 16 * 68 * 384);
estimated_output_bit = (unsigned char *) malloc16(sizeof(unsigned char) * 16 * 68 * 384);
@@ -633,19 +634,23 @@ int main(int argc, char **argv)
//for (int i=0;i<16;i++) printf("%f\n",gaussdouble(0.0,1.0));
snrRun = 0;
int n_errs;
for (SNR = snr0; SNR < snr1; SNR += snr_step) {
varArray_t *table_rx=initVarArray(1000,sizeof(double));
int error_flag = 0;
n_false_positive = 0;
effRate = 0;
n_errors = 0;
int n_errors[4] = {0,0,0,0};;
int round_trials[4]={0,0,0,0};
uint32_t errors_scrambling[4] = {0,0,0,0};
for (trial = 0; trial < n_trials; trial++) {
uint8_t round = 0;
crc_status = 1;
errors_scrambling = 0;
errors_decoding = 0;
while (round<max_rounds && crc_status) {
round_trials[round]++;
ulsch_ue[0]->harq_processes[harq_pid]->round = round;
gNB->ulsch[0][0]->harq_processes[harq_pid]->round = round;
rv_index = nr_rv_round_map[round];
@@ -837,13 +842,12 @@ int main(int argc, char **argv)
if (UE2gNB->max_Doppler == 0) {
multipath_channel(UE2gNB,s_re,s_im,r_re,r_im,
slot_length,0);
slot_length,0,(n_trials==1)?1:0);
} else {
multipath_tv_channel(UE2gNB,s_re,s_im,r_re,r_im,
2*slot_length,0);
}
for (i=0; i<slot_length; i++) {
if (n_trials== 1 && i<256) printf("i %d : (%f,%f)*%f = (%f,%f) \n",i,r_re[0][i],r_im[0][i],tx_gain,r_re[0][i]*tx_gain,r_im[0][i]*tx_gain);
for (ap=0; ap<frame_parms->nb_antennas_rx; ap++) {
((int16_t*) &gNB->common_vars.rxdata[ap][slot_offset])[(2*i) + (delay*2)] = (int16_t)((tx_gain*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)((tx_gain*r_im[ap][i]) + (sqrt(sigma/2)*gaussdouble(0.0,1.0)));
@@ -901,104 +905,116 @@ int main(int argc, char **argv)
}
start_meas(&gNB->phy_proc_rx);
////////////////////////////////////////////////////////////
if (gNB->ulsch[0][0]->last_iteration_cnt >=
gNB->ulsch[0][0]->max_ldpc_iterations+1) {
error_flag = 1;
n_errors++;
crc_status = 1;
n_errors[round]++;
crc_status = 1;
} else {
crc_status = 0;
}
if(n_trials==1) printf("end of round %d rv_index %d\n",round, rv_index);
round++;
crc_status = 0;
}
if(n_trials==1) printf("end of round %d rv_index %d\n",round, rv_index);
for (i = 0; i < available_bits; i++) {
if(((ulsch_ue[0]->g[i] == 0) && (gNB->pusch_vars[UE_id]->llr[i] <= 0)) ||
((ulsch_ue[0]->g[i] == 1) && (gNB->pusch_vars[UE_id]->llr[i] >= 0)))
{
/*if(errors_scrambling == 0)
printf("\x1B[34m" "[frame %d][trial %d]\t1st bit in error in unscrambling = %d\n" "\x1B[0m", frame, trial, i);*/
errors_scrambling[round]++;
}
}
round++;
} // round
//----------------------------------------------------------
//----------------- count and print errors -----------------
//----------------------------------------------------------
for (i = 0; i < available_bits; i++) {
if(((ulsch_ue[0]->g[i] == 0) && (gNB->pusch_vars[UE_id]->llr[i] <= 0)) ||
((ulsch_ue[0]->g[i] == 1) && (gNB->pusch_vars[UE_id]->llr[i] >= 0)))
{
/*if(errors_scrambling == 0)
printf("\x1B[34m" "[frame %d][trial %d]\t1st bit in error in unscrambling = %d\n" "\x1B[0m", frame, trial, i);*/
errors_scrambling++;
}
}
if (errors_scrambling > 0) {
if (n_trials==1)
printf("\x1B[31m""[frame %d][trial %d]\tnumber of errors in unscrambling = %u\n" "\x1B[0m", frame, trial, errors_scrambling);
}
for (i = 0; i < TBS; i++) {
estimated_output_bit[i] = (ulsch_gNB->harq_processes[harq_pid]->b[i/8] & (1 << (i & 7))) >> (i & 7);
test_input_bit[i] = (ulsch_ue[0]->harq_processes[harq_pid]->b[i/8] & (1 << (i & 7))) >> (i & 7);
if (estimated_output_bit[i] != test_input_bit[i]) {
/*if(errors_decoding == 0)
printf("\x1B[34m""[frame %d][trial %d]\t1st bit in error in decoding = %d\n" "\x1B[0m", frame, trial, i);*/
errors_decoding++;
}
}
if (n_trials == 1) {
for (int r=0;r<ulsch_ue[0]->harq_processes[harq_pid]->C;r++)
for (int i=0;i<ulsch_ue[0]->harq_processes[harq_pid]->K>>3;i++) {
/*if ((ulsch_ue[0]->harq_processes[harq_pid]->c[r][i]^ulsch_gNB->harq_processes[harq_pid]->c[r][i]) != 0) printf("************");
printf("r %d: in[%d] %x, out[%d] %x (%x)\n",r,
i,ulsch_ue[0]->harq_processes[harq_pid]->c[r][i],
i,ulsch_gNB->harq_processes[harq_pid]->c[r][i],
ulsch_ue[0]->harq_processes[harq_pid]->c[r][i]^ulsch_gNB->harq_processes[harq_pid]->c[r][i]);*/
}
if (n_trials == 1 && errors_scrambling[0] > 0) {
printf("\x1B[31m""[frame %d][trial %d]\tnumber of errors in unscrambling = %u\n" "\x1B[0m", frame, trial, errors_scrambling);
}
for (i = 0; i < TBS; i++) {
estimated_output_bit[i] = (ulsch_gNB->harq_processes[harq_pid]->b[i/8] & (1 << (i & 7))) >> (i & 7);
test_input_bit[i] = (ulsch_ue[0]->harq_processes[harq_pid]->b[i/8] & (1 << (i & 7))) >> (i & 7);
if (estimated_output_bit[i] != test_input_bit[i]) {
/*if(errors_decoding == 0)
printf("\x1B[34m""[frame %d][trial %d]\t1st bit in error in decoding = %d\n" "\x1B[0m", frame, trial, i);*/
errors_decoding++;
}
}
if (n_trials == 1) {
for (int r=0;r<ulsch_ue[0]->harq_processes[harq_pid]->C;r++)
for (int i=0;i<ulsch_ue[0]->harq_processes[harq_pid]->K>>3;i++) {
/*if ((ulsch_ue[0]->harq_processes[harq_pid]->c[r][i]^ulsch_gNB->harq_processes[harq_pid]->c[r][i]) != 0) printf("************");
printf("r %d: in[%d] %x, out[%d] %x (%x)\n",r,
i,ulsch_ue[0]->harq_processes[harq_pid]->c[r][i],
i,ulsch_gNB->harq_processes[harq_pid]->c[r][i],
ulsch_ue[0]->harq_processes[harq_pid]->c[r][i]^ulsch_gNB->harq_processes[harq_pid]->c[r][i]);*/
}
if (errors_decoding > 0 && error_flag == 0) {
n_false_positive++;
if (n_trials==1)
printf("\x1B[31m""[frame %d][trial %d]\tnumber of errors in decoding = %u\n" "\x1B[0m", frame, trial, errors_decoding);
}
roundStats[snrRun] += ((float)round);
if (!crc_status) effRate += ((float)TBS)/round;
} // trial loop
roundStats[snrRun]/=((float)n_trials);
effRate /= n_trials;
printf("*****************************************\n");
printf("SNR %f: n_errors (negative CRC) = %d/%d, false_positive %d/%d, errors_scrambling %u/%u\n", SNR, n_errors, n_trials, n_false_positive, n_trials, errors_scrambling, available_bits*n_trials);
}
if (errors_decoding > 0 && error_flag == 0) {
n_false_positive++;
if (n_trials==1)
printf("\x1B[31m""[frame %d][trial %d]\tnumber of errors in decoding = %u\n" "\x1B[0m", frame, trial, errors_decoding);
}
roundStats[snrRun] += ((float)round);
if (!crc_status) effRate += ((float)TBS)/round;
} // trial loop
roundStats[snrRun]/=((float)n_trials);
effRate /= n_trials;
printf("*****************************************\n");
printf("SNR %f: n_errors (%d/%d,%d/%d,%d/%d,%d/%d) (negative CRC), false_positive %d/%d, errors_scrambling (%u/%u,%u/%u,%u/%u,%u/%u\n", SNR, n_errors[0], round_trials[0],n_errors[1], round_trials[1],n_errors[2], round_trials[2],n_errors[3], round_trials[3], n_false_positive, n_trials, errors_scrambling[0],available_bits*n_trials,errors_scrambling[1],available_bits*n_trials,errors_scrambling[2],available_bits*n_trials,errors_scrambling[3],available_bits*n_trials);
printf("\n");
printf("SNR %f: Channel BLER (%e,%e,%e,%e), Channel BER (%e,%e,%e,%e) Avg round %.2f, Eff Rate %.4f bits/slot, Eff Throughput %.2f, TBS %d bits/slot\n", SNR,
(double)n_errors[0]/round_trials[0],
(double)n_errors[1]/round_trials[0],
(double)n_errors[2]/round_trials[0],
(double)n_errors[3]/round_trials[0],
(double)errors_scrambling[0]/available_bits/round_trials[0],
(double)errors_scrambling[1]/available_bits/round_trials[0],
(double)errors_scrambling[2]/available_bits/round_trials[0],
(double)errors_scrambling[3]/available_bits/round_trials[0],
roundStats[snrRun],effRate,effRate/TBS*100,TBS);
printf("*****************************************\n");
printf("\n");
if (print_perf==1) {
printDistribution(&gNB->phy_proc_rx,table_rx,"Total PHY proc rx");
printStatIndent(&gNB->ulsch_channel_estimation_stats,"ULSCH channel estimation time");
printStatIndent(&gNB->ulsch_rbs_extraction_stats,"ULSCH rbs extraction time");
printStatIndent(&gNB->ulsch_channel_compensation_stats,"ULSCH channel compensation time");
printStatIndent(&gNB->ulsch_llr_stats,"ULSCH llr computation");
printStatIndent(&gNB->ulsch_unscrambling_stats,"ULSCH unscrambling");
printStatIndent(&gNB->ulsch_decoding_stats,"ULSCH total decoding time");
printStatIndent2(&gNB->ulsch_deinterleaving_stats,"ULSCH deinterleaving");
printStatIndent2(&gNB->ulsch_rate_unmatching_stats,"ULSCH rate matching rx");
printStatIndent2(&gNB->ulsch_ldpc_decoding_stats,"ULSCH ldpc decoding");
printf("\n");
printf("SNR %f: Channel BLER %e, Channel BER %e Avg round %.2f, Eff Rate %.4f bits/slot, Eff Throughput %.2f, TBS %d bits/slot\n", SNR,(double)n_errors/n_trials,(double)errors_scrambling/available_bits/n_trials,roundStats[snrRun],effRate,effRate/TBS*100,TBS);
printf("*****************************************\n");
printf("\n");
if (print_perf==1) {
printDistribution(&gNB->phy_proc_rx,table_rx,"Total PHY proc rx");
printStatIndent(&gNB->ulsch_channel_estimation_stats,"ULSCH channel estimation time");
printStatIndent(&gNB->ulsch_rbs_extraction_stats,"ULSCH rbs extraction time");
printStatIndent(&gNB->ulsch_channel_compensation_stats,"ULSCH channel compensation time");
printStatIndent(&gNB->ulsch_llr_stats,"ULSCH llr computation");
printStatIndent(&gNB->ulsch_unscrambling_stats,"ULSCH unscrambling");
printStatIndent(&gNB->ulsch_decoding_stats,"ULSCH total decoding time");
printStatIndent2(&gNB->ulsch_deinterleaving_stats,"ULSCH deinterleaving");
printStatIndent2(&gNB->ulsch_rate_unmatching_stats,"ULSCH rate matching rx");
printStatIndent2(&gNB->ulsch_ldpc_decoding_stats,"ULSCH ldpc decoding");
printf("\n");
}
if(n_trials==1)
break;
if ((float)n_errors/(float)n_trials <= target_error_rate) {
printf("*************\n");
printf("PUSCH test OK\n");
printf("*************\n");
break;
}
}
if(n_trials==1)
break;
if ((float)n_errors[0]/(float)n_trials <= target_error_rate) {
printf("*************\n");
printf("PUSCH test OK\n");
printf("*************\n");
break;
}
snrRun++;
n_errs = n_errors[0];
} // SNR loop
printf("\n");
@@ -1014,5 +1030,5 @@ int main(int argc, char **argv)
if (scg_fd)
fclose(scg_fd);
return (n_errors);
return (n_errs);
}
openair1/SIMULATION/TOOLS/channel_sim.c
+2 -2
View File
@@ -180,7 +180,7 @@ void do_DL_sig(sim_t *sim,
//RU2UE[eNB_id][UE_id]->path_loss_dB = 0;
multipath_channel(sim->RU2UE[ru_id][UE_id][CC_id],s_re,s_im,r_re0,r_im0,
length,hold_channel);
length,hold_channel,0);
#ifdef DEBUG_SIM
rx_pwr = signal_energy_fp2(sim->RU2UE[ru_id][UE_id][CC_id]->ch[0],
sim->RU2UE[ru_id][UE_id][CC_id]->channel_length)*sim->RU2UE[ru_id][UE_id][CC_id]->channel_length;
@@ -394,7 +394,7 @@ void do_UL_sig(sim_t *sim,
multipath_channel(sim->UE2RU[UE_id][ru_id][CC_id],s_re,s_im,r_re0,r_im0,
frame_parms->samples_per_tti,hold_channel);
frame_parms->samples_per_tti,hold_channel,0);
rx_pwr = signal_energy_fp2(sim->UE2RU[UE_id][ru_id][CC_id]->ch[0],
openair1/SIMULATION/TOOLS/multipath_channel.c
+9 -2
View File
@@ -44,7 +44,8 @@ void multipath_channel(channel_desc_t *desc,
double rx_sig_re[2][30720*2],
double rx_sig_im[2][30720*2],
uint32_t length,
uint8_t keep_channel)
uint8_t keep_channel,
int log_channel)
{
int i,ii,j,l;
@@ -150,7 +151,8 @@ void multipath_channel(channel_desc_t *desc,
double *rx_sig_re[2],
double *rx_sig_im[2],
uint32_t length,
uint8_t keep_channel)
uint8_t keep_channel,
int log_channel)
{
int i,ii,j,l;
@@ -196,6 +198,11 @@ void multipath_channel(channel_desc_t *desc,
rx_tmp.x += (tx.x * desc->ch[ii+(j*desc->nb_rx)][l].x) - (tx.y * desc->ch[ii+(j*desc->nb_rx)][l].y);
rx_tmp.y += (tx.y * desc->ch[ii+(j*desc->nb_rx)][l].x) + (tx.x * desc->ch[ii+(j*desc->nb_rx)][l].y);
if (i==0 && log_channel == 1) {
printf("channel[%d][%d][%d] = %f dB (%e,%e)\n",ii,j,l,10*log10(pow(desc->ch[ii+(j*desc->nb_rx)][l].x,2.0)+pow(desc->ch[ii+(j*desc->nb_rx)][l].y,2.0)),
desc->ch[ii+(j*desc->nb_rx)][l].x,
desc->ch[ii+(j*desc->nb_rx)][l].y);
}
} //l
} // j
openair1/SIMULATION/TOOLS/random_channel.c
+7 -7
View File
@@ -695,9 +695,10 @@ channel_desc_t *new_channel_desc_scm(uint8_t nb_tx,
sum_amps += chan_desc->amps[i];
}
for (i = 0; i<chan_desc->nb_taps; i++)
for (i = 0; i<chan_desc->nb_taps; i++) {
chan_desc->amps[i] /= sum_amps;
tdl_delays[i] *= DS_TDL;
}
chan_desc->delays = tdl_delays;
chan_desc->ricean_factor = tdl_ricean_factor;
chan_desc->aoa = 0;
@@ -1733,15 +1734,14 @@ int random_channel(channel_desc_t *desc, uint8_t abstraction_flag) {
desc->ch[aarx+(aatx*desc->nb_rx)][k].x += s*desc->a[l][aarx+(aatx*desc->nb_rx)].x;
desc->ch[aarx+(aatx*desc->nb_rx)][k].y += s*desc->a[l][aarx+(aatx*desc->nb_rx)].y;
// printf("l %d : desc->ch.x %f\n",l,desc->a[l][aarx+(aatx*desc->nb_rx)].x);
// printf("l %d : desc->ch.x %f, s %e, delay %f\n",l,desc->a[l][aarx+(aatx*desc->nb_rx)].x,s,desc->delays[l]);
} //nb_taps
#ifdef DEBUG_CH
k=0;
printf("(%d,%d,%d)->(%f,%f)\n",k,aarx,aatx,desc->ch[aarx+(aatx*desc->nb_rx)][k].x,desc->ch[aarx+(aatx*desc->nb_rx)][k].y);
printf("(%d,%d,%d)->(%e,%e)\n",k,aarx,aatx,desc->ch[aarx+(aatx*desc->nb_rx)][k].x,desc->ch[aarx+(aatx*desc->nb_rx)][k].y);
#endif
}
} //channel_length
} //channel_length
}
} //aatx
} //aarx
openair1/SIMULATION/TOOLS/sim.h
+5 -2
View File
@@ -277,7 +277,8 @@ int random_channel(channel_desc_t *desc, uint8_t abstraction_flag);
double rx_sig_re[2],
double rx_sig_im[2],
uint32_t length,
uint8_t keep_channel)
uint8_t keep_channel,
int log_channel)
\brief This function generates and applys a random frequency selective random channel model.
@param desc Pointer to channel descriptor
@@ -287,6 +288,7 @@ int random_channel(channel_desc_t *desc, uint8_t abstraction_flag);
@param rx_sig_im output signal (imaginary component)
@param length Length of input signal
@param keep_channel Set to 1 to keep channel constant for null-B/F
@param log_channel=1 make channel coefficients come out for first sample of input
*/
void multipath_channel(channel_desc_t *desc,
@@ -295,7 +297,8 @@ void multipath_channel(channel_desc_t *desc,
double *rx_sig_re[2],
double *rx_sig_im[2],
uint32_t length,
uint8_t keep_channel);
uint8_t keep_channel,
int log_channel);
/*
\fn double compute_pbch_sinr(channel_desc_t *desc,
channel_desc_t *desc_i1,