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dft-based pucch0 receiver

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This commit is contained in:
Raymond Knopp
2020-04-01 16:52:56 +02:00
parent 0a2e033253
commit 72d76c7585
4 changed files with 98 additions and 26 deletions
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openair1/PHY/NR_TRANSPORT/pucch_rx.c
+70 -18
View File
@@ -17,6 +17,7 @@
#include "T.h"
#define DEBUG_NR_PUCCH_RX 1
void nr_decode_pucch0(int32_t **rxdataF,
NR_DL_FRAME_PARMS *frame_parms,
@@ -79,28 +80,32 @@ void nr_decode_pucch0(int32_t **rxdataF,
nr_group_sequence_hopping(pucch_GroupHopping,pucch_pdu->hopping_id,n_hop,slot,&u,&v); // calculating u and v value
alpha = nr_cyclic_shift_hopping(pucch_pdu->hopping_id,pucch_pdu->initial_cyclic_shift,mcs[i],l,pucch_pdu->start_symbol_index,slot);
#ifdef DEBUG_NR_PUCCH_RX
printf("\t [nr_generate_pucch0] sequence generation \tu=%d \tv=%d \talpha=%lf \t(for symbol l=%d)\n",u,v,alpha,l);
#endif
#ifdef DEBUG_NR_PUCCH_RX
printf("\t [nr_generate_pucch0] sequence generation \tu=%d \tv=%d \talpha=%lf \t(for symbol l=%d/%d,mcs %d)\n",u,v,alpha,l,l+pucch_pdu->start_symbol_index,mcs[i]);
#endif
for (n=0; n<12; n++){
x_n_re[i][(12*l)+n] = (int16_t)((int16_t)(((((int32_t)(round(32767*cos(alpha*n))) * table_5_2_2_2_2_Re[u][n])>>15)
- (((int32_t)(round(32767*sin(alpha*n))) * table_5_2_2_2_2_Im[u][n])>>15)))>>15); // Re part of base sequence shifted by alpha
- (((int32_t)(round(32767*sin(alpha*n))) * table_5_2_2_2_2_Im[u][n])>>15)))); // Re part of base sequence shifted by alpha
x_n_im[i][(12*l)+n] =(int16_t)((int16_t)(((((int32_t)(round(32767*cos(alpha*n))) * table_5_2_2_2_2_Im[u][n])>>15)
+ (((int32_t)(round(32767*sin(alpha*n))) * table_5_2_2_2_2_Re[u][n])>>15)))>>15); // Im part of base sequence shifted by alpha
#ifdef DEBUG_NR_PUCCH_RX
printf("\t [nr_generate_pucch0] sequence generation \tu=%d \tv=%d \talpha=%lf \tx_n(l=%d,n=%d)=(%d,%d)\n",
u,v,alpha,l,n,x_n_re[(12*l)+n],x_n_im[(12*l)+n]);
#endif
+ (((int32_t)(round(32767*sin(alpha*n))) * table_5_2_2_2_2_Re[u][n])>>15)))); // Im part of base sequence shifted by alpha
#ifdef DEBUG_NR_PUCCH_RX
printf("\t [nr_generate_pucch0] sequence generation \tu=%d \tv=%d \talpha=%lf \tx_n(l=%d,n=%d)=(%d,%d) %d,%d\n",
u,v,alpha,l,n,x_n_re[i][(12*l)+n],x_n_im[i][(12*l)+n],
(int32_t)(round(32767*cos(alpha*n))),
(int32_t)(round(32767*sin(alpha*n))));
#endif
}
}
}
int16_t r_re[24],r_im[24];
/*
* Implementing TS 38.211 Subclause 6.3.2.3.2 Mapping to physical resources
*/
uint32_t re_offset=0;
uint8_t l2;
#ifdef OLD_IMPL
int16_t r_re[24],r_im[24];
for (l=0; l<pucch_pdu->nr_of_symbols; l++) {
l2 = l+pucch_pdu->start_symbol_index;
@@ -122,7 +127,7 @@ void nr_decode_pucch0(int32_t **rxdataF,
if (re_offset>= frame_parms->ofdm_symbol_size)
re_offset-=frame_parms->ofdm_symbol_size;
}
}
}
double corr[nr_sequences],corr_re[nr_sequences],corr_im[nr_sequences];
memset(corr,0,nr_sequences*sizeof(double));
memset(corr_re,0,nr_sequences*sizeof(double));
@@ -144,7 +149,55 @@ void nr_decode_pucch0(int32_t **rxdataF,
max_corr=corr[i];
}
}
#else
int16_t *x_re = x_n_re[0],*x_im = x_n_im[0];
int16_t xr[32] __attribute__((aligned(32)));
int16_t xrt[32] __attribute__((aligned(32)));
int32_t xrtmag=0;
int maxpos=0;
int n2=0;
uint8_t index=0;
memset((void*)xr,0,32*sizeof(int16_t));
for (l=0; l<pucch_pdu->nr_of_symbols; l++) {
l2 = l+pucch_pdu->start_symbol_index;
re_offset = (12*pucch_pdu->prb_start) + frame_parms->first_carrier_offset;
if (re_offset>= frame_parms->ofdm_symbol_size)
re_offset-=frame_parms->ofdm_symbol_size;
AssertFatal(re_offset+12 < frame_parms->ofdm_symbol_size,"pucch straddles DC carrier, handle this!\n");
n2=0;
int16_t *r=(int16_t*)&rxdataF[0][(l2*frame_parms->ofdm_symbol_size+re_offset)];
if (l==0) for (n=0;n<12;n++,n2+=2) {
xr[n2] =((int32_t)x_re[n]*r[n2]+(int32_t)x_im[n]*r[n2+1])>>15;
xr[n2+1]=((int32_t)x_re[n]*r[n2+1]-(int32_t)x_im[n]*r[n2])>>15;
printf("x (%d,%d), r (%d,%d), xr (%d,%d)\n",
x_re[n],x_im[n],r[n2],r[n2+1],xr[n2],xr[n2+1]);
}
else for (n=0;n<12;n++,n2+=2) {
xr[n2] +=((int32_t)x_re[n]*r[n2]+(int32_t)x_im[n]*r[n2+1])>>15;
xr[n2+1]+=((int32_t)x_re[n]*r[n2+1]-(int32_t)x_im[n]*r[n2])>>15;
}
x_re+=12;
x_im+=12;
}
idft16f(xr,xrt);
n2=0;
int32_t temp;
for (n=0;n<16;n++,n2+=2) {
#ifdef DEBUG_NR_PUCCH_RX
printf("PUCCH IDFT[%d] = (%d,%d)\n",n,xrt[n2],xrt[n2+1]);
#endif
if ((temp=(int32_t)xrt[n2]*xrt[n2]+(int32_t)xrt[n2+1]*xrt[n2+1])<xrtmag) {
xrtmag=temp;
maxpos=n;
}
}
exit(-1);
#endif
// first bit of bitmap for sr presence and second bit for acknack presence
uci_pdu->pdu_bit_map = pucch_pdu->sr_flag | ((pucch_pdu->bit_len_harq>0)<<1);
uci_pdu->pucch_format = 0; // format 0
@@ -281,7 +334,6 @@ void nr_decode_pucch1( int32_t **rxdataF,
re_offset = ((l+startingSymbolIndex)*frame_parms->ofdm_symbol_size) + (12*startingPRB) + frame_parms->first_carrier_offset;
}
//txptr = &txdataF[0][re_offset];
for (int n=0; n<12; n++) {
if ((n==6) && (startingPRB == (frame_parms->N_RB_DL>>1)) && ((frame_parms->N_RB_DL & 1) == 1)) {
// if number RBs in bandwidth is odd and current PRB contains DC, we need to recalculate the offset when n=6 (for second half PRB)
@@ -294,7 +346,7 @@ void nr_decode_pucch1( int32_t **rxdataF,
#ifdef DEBUG_NR_PUCCH_RX
printf("\t [nr_generate_pucch1] mapping PUCCH to RE \t amp=%d \tofdm_symbol_size=%d \tN_RB_DL=%d \tfirst_carrier_offset=%d \tz_pucch[%d]=txptr(%d)=(x_n(l=%d,n=%d)=(%d,%d))\n",
amp,frame_parms->ofdm_symbol_size,frame_parms->N_RB_DL,frame_parms->first_carrier_offset,i+n,re_offset,
l,n,((int16_t *)&txdataF[0][re_offset])[0],((int16_t *)&txdataF[0][re_offset])[1]);
l,n,((int16_t *)&rxdataF[0][re_offset])[0],((int16_t *)&rxdataF[0][re_offset])[1]);
#endif
}
@@ -305,7 +357,7 @@ void nr_decode_pucch1( int32_t **rxdataF,
#ifdef DEBUG_NR_PUCCH_RX
printf("\t [nr_generate_pucch1] mapping DM-RS to RE \t amp=%d \tofdm_symbol_size=%d \tN_RB_DL=%d \tfirst_carrier_offset=%d \tz_dm-rs[%d]=txptr(%d)=(x_n(l=%d,n=%d)=(%d,%d))\n",
amp,frame_parms->ofdm_symbol_size,frame_parms->N_RB_DL,frame_parms->first_carrier_offset,i+n,re_offset,
l,n,((int16_t *)&txdataF[0][re_offset])[0],((int16_t *)&txdataF[0][re_offset])[1]);
l,n,((int16_t *)&rxdataF[0][re_offset])[0],((int16_t *)&rxdataF[0][re_offset])[1]);
#endif
// printf("l=%d\ti=%d\tre_offset=%d\treceived dmrs re=%d\tim=%d\n",l,i,re_offset,z_dmrs_re_rx[i+n],z_dmrs_im_rx[i+n]);
}
@@ -416,7 +468,7 @@ void nr_decode_pucch1( int32_t **rxdataF,
mprime, m, n, (mprime*12*N_SF_mprime0_PUCCH_1)+(m*12)+n,
table_6_3_2_4_1_2_Wi_Re[N_SF_mprime_PUCCH_1][w_index][m],y_n_re[n],table_6_3_2_4_1_2_Wi_Im[N_SF_mprime_PUCCH_1][w_index][m],y_n_im[n],
table_6_3_2_4_1_2_Wi_Re[N_SF_mprime_PUCCH_1][w_index][m],y_n_im[n],table_6_3_2_4_1_2_Wi_Im[N_SF_mprime_PUCCH_1][w_index][m],y_n_re[n],
z_re[(mprime*12*N_SF_mprime0_PUCCH_1)+(m*12)+n],z_im[(mprime*12*N_SF_mprime0_PUCCH_1)+(m*12)+n]);
z_re_rx[(mprime*12*N_SF_mprime0_PUCCH_1)+(m*12)+n],z_im_rx[(mprime*12*N_SF_mprime0_PUCCH_1)+(m*12)+n]);
#endif
// multiplying with conjugate of low papr sequence
z_re_temp = (int16_t)(((((int32_t)(r_u_v_alpha_delta_re[n])*z_re_rx[(mprime*12*N_SF_mprime0_PUCCH_1)+(m*12)+n])>>15)
@@ -450,7 +502,7 @@ void nr_decode_pucch1( int32_t **rxdataF,
mprime, m, n, (mprime*12*N_SF_mprime0_PUCCH_1)+(m*12)+n,
table_6_3_2_4_1_2_Wi_Re[N_SF_mprime_PUCCH_1][w_index][m],r_u_v_alpha_delta_dmrs_re[n],table_6_3_2_4_1_2_Wi_Im[N_SF_mprime_PUCCH_1][w_index][m],r_u_v_alpha_delta_dmrs_im[n],
table_6_3_2_4_1_2_Wi_Re[N_SF_mprime_PUCCH_1][w_index][m],r_u_v_alpha_delta_dmrs_im[n],table_6_3_2_4_1_2_Wi_Im[N_SF_mprime_PUCCH_1][w_index][m],r_u_v_alpha_delta_dmrs_re[n],
z_dmrs_re[(mprime*12*N_SF_mprime0_PUCCH_1)+(m*12)+n],z_dmrs_im[(mprime*12*N_SF_mprime0_PUCCH_1)+(m*12)+n]);
z_dmrs_re_rx[(mprime*12*N_SF_mprime0_PUCCH_1)+(m*12)+n],z_dmrs_im_rx[(mprime*12*N_SF_mprime0_PUCCH_1)+(m*12)+n]);
#endif
//finding channel coeffcients by dividing received dmrs with actual dmrs and storing them in z_dmrs_re_rx and z_dmrs_im_rx arrays
z_dmrs_re_temp = (int16_t)(((((int32_t)(r_u_v_alpha_delta_dmrs_re[n])*z_dmrs_re_rx[(mprime*12*N_SF_mprime0_PUCCH_DMRS_1)+(m*12)+n])>>15)
@@ -501,7 +553,7 @@ void nr_decode_pucch1( int32_t **rxdataF,
mprime, m, n, (mprime*12*N_SF_mprime0_PUCCH_1)+(m*12)+n,
table_6_3_2_4_1_2_Wi_Re[N_SF_mprime_PUCCH_1][w_index][m],y_n_re[n],table_6_3_2_4_1_2_Wi_Im[N_SF_mprime_PUCCH_1][w_index][m],y_n_im[n],
table_6_3_2_4_1_2_Wi_Re[N_SF_mprime_PUCCH_1][w_index][m],y_n_im[n],table_6_3_2_4_1_2_Wi_Im[N_SF_mprime_PUCCH_1][w_index][m],y_n_re[n],
z_re[(mprime*12*N_SF_mprime0_PUCCH_1)+(m*12)+n],z_im[(mprime*12*N_SF_mprime0_PUCCH_1)+(m*12)+n]);
z_re_rx[(mprime*12*N_SF_mprime0_PUCCH_1)+(m*12)+n],z_im_rx[(mprime*12*N_SF_mprime0_PUCCH_1)+(m*12)+n]);
#endif
z_re_temp = (int16_t)(((((int32_t)(r_u_v_alpha_delta_re[n])*z_re_rx[(mprime*12*N_SF_mprime0_PUCCH_1)+(m*12)+n])>>15)
+ (((int32_t)(r_u_v_alpha_delta_im[n])*z_im_rx[(mprime*12*N_SF_mprime0_PUCCH_1)+(m*12)+n])>>15))>>1);
@@ -529,7 +581,7 @@ void nr_decode_pucch1( int32_t **rxdataF,
mprime, m, n, (mprime*12*N_SF_mprime0_PUCCH_1)+(m*12)+n,
table_6_3_2_4_1_2_Wi_Re[N_SF_mprime_PUCCH_1][w_index][m],r_u_v_alpha_delta_dmrs_re[n],table_6_3_2_4_1_2_Wi_Im[N_SF_mprime_PUCCH_1][w_index][m],r_u_v_alpha_delta_dmrs_im[n],
table_6_3_2_4_1_2_Wi_Re[N_SF_mprime_PUCCH_1][w_index][m],r_u_v_alpha_delta_dmrs_im[n],table_6_3_2_4_1_2_Wi_Im[N_SF_mprime_PUCCH_1][w_index][m],r_u_v_alpha_delta_dmrs_re[n],
z_dmrs_re[(mprime*12*N_SF_mprime0_PUCCH_1)+(m*12)+n],z_dmrs_im[(mprime*12*N_SF_mprime0_PUCCH_1)+(m*12)+n]);
z_dmrs_re_rx[(mprime*12*N_SF_mprime0_PUCCH_1)+(m*12)+n],z_dmrs_im_rx[(mprime*12*N_SF_mprime0_PUCCH_1)+(m*12)+n]);
#endif
//finding channel coeffcients by dividing received dmrs with actual dmrs and storing them in z_dmrs_re_rx and z_dmrs_im_rx arrays
z_dmrs_re_temp = (int16_t)(((((int32_t)(r_u_v_alpha_delta_dmrs_re[n])*z_dmrs_re_rx[(mprime*12*N_SF_mprime0_PUCCH_DMRS_1)+(m*12)+n])>>15)
openair1/PHY/TOOLS/lte_dfts.c
+4
View File
@@ -2437,6 +2437,10 @@ static inline void idft16(int16_t *x,int16_t *y)
#endif
}
void idft16f(int16_t *x,int16_t *y) {
idft16(x,y);
}
#if defined(__x86_64__) || defined(__i386__)
#ifdef __AVX2__
// Does two 16-point IDFTS (x[0 .. 15] is 128 LSBs of input vector, x[16..31] is in 128 MSBs)
openair1/PHY/TOOLS/tools_defs.h
+2
View File
@@ -171,6 +171,8 @@ This function performs optimized fixed-point radix-2 FFT/IFFT.
);
*/
void idft16f(int16_t *x,int16_t *y);
void idft1536(int16_t *sigF,int16_t *sig,int scale);
void idft6144(int16_t *sigF,int16_t *sig,int scale);
openair1/SIMULATION/NR_PHY/pucchsim.c
+22 -8
View File
@@ -454,8 +454,6 @@ int main(int argc, char **argv)
for(SNR=snr0;SNR<=snr1;SNR=SNR+1){
ack_nack_errors=0;
n_errors = 0;
sigma2_dB = 20*log10((double)amp/32767)-SNR;
sigma2 = pow(10,sigma2_dB/10);
for (trial=0; trial<n_trials; trial++) {
bzero(txdata[0],frame_length_complex_samples*sizeof(int));
if(format==0){
@@ -464,7 +462,11 @@ int main(int argc, char **argv)
else{
nr_generate_pucch1(UE,txdata,frame_parms,UE->pucch_config_dedicated,actual_payload,amp,nr_tti_tx,m0,nrofSymbols,startingSymbolIndex,startingPRB,startingPRB_intraSlotHopping,0,nr_bit);
}
for(i=0; i<frame_length_complex_samples; i++) {
int tx_lev=signal_energy(
sigma2_dB = 20*log10((double)amp/32767)-SNR;
sigma2 = pow(10,sigma2_dB/10);
for(i=(nr_tti_tx*frame_parms->samples_per_slot; i<(nr_tti_tx+1)*frame_parms->samples_per_slot; i++) {
r_re[aa][i]=((double)(((int16_t *)txdata[0])[(i<<1)])/32767 + sqrt(sigma2/2)*gaussdouble(0.0,1.0));
r_im[aa][i]=((double)(((int16_t *)txdata[0])[(i<<1)+1])/32767+ sqrt(sigma2/2)*gaussdouble(0.0,1.0));
r_re[aa][i]=r_re[0][i]/(sqrt(sigma2/2)+1);
@@ -481,13 +483,26 @@ int main(int argc, char **argv)
((int16_t *)txdata[aa])[(i<<1)+1] =(int16_t)round(r_im[aa][i]*32767);
}
if(format==0){
nr_decode_pucch0(txdata,PUCCH_GroupHopping,n_id,&(payload_received),frame_parms,amp,nr_tti_tx,m0,nrofSymbols,startingSymbolIndex,startingPRB,nr_bit);
nfapi_nr_uci_pucch_pdu_format_0_1_t uci_pdu;
nfapi_nr_pucch_pdu_t pucch_pdu;
pucch_pdu.group_hop_flag = PUCCH_GroupHopping&1;
pucch_pdu.sequence_hop_flag = (PUCCH_GroupHopping>>1)&1;
pucch_pdu.bit_len_harq = nr_bit;
pucch_pdu.sr_flag = 0;
pucch_pdu.nr_of_symbols = nrofSymbols;
pucch_pdu.hopping_id = n_id;
pucch_pdu.initial_cyclic_shift = 0;
pucch_pdu.start_symbol_index = startingSymbolIndex;
pucch_pdu.prb_start = startingPRB;
nr_decode_pucch0(txdata,frame_parms,nr_tti_tx,&uci_pdu,&pucch_pdu);
if(nr_bit==1)
ack_nack_errors+=(((actual_payload^payload_received)&2)>>1);
ack_nack_errors+=(actual_payload^uci_pdu.harq->harq_list[0].harq_value);
else
ack_nack_errors+=(((actual_payload^payload_received)&2)>>1) + (((actual_payload^payload_received)&4)>>2);
ack_nack_errors+=((actual_payload^uci_pdu.harq->harq_list[0].harq_value)+((actual_payload>>1)^uci_pdu.harq->harq_list[1].harq_value));
free(uci_pdu.harq->harq_list);
}
else{
nr_decode_pucch1(txdata,PUCCH_GroupHopping,n_id,&(payload_received),frame_parms,amp,nr_tti_tx,m0,nrofSymbols,startingSymbolIndex,startingPRB,startingPRB_intraSlotHopping,timeDomainOCC,nr_bit);
if(nr_bit==1)
ack_nack_errors+=((actual_payload^payload_received)&1);
@@ -496,8 +511,7 @@ int main(int argc, char **argv)
}
n_errors=((actual_payload^payload_received)&1)+(((actual_payload^payload_received)&2)>>1)+(((actual_payload^payload_received)&4)>>2)+n_errors;
}
printf("Decoded payload is %ld\n",payload_received);
printf("SNR=%f, n_trials=%d, n_bit_errors=%d\n",SNR,n_trials,n_errors);
printf("SNR=%f, n_trials=%d, n_bit_errors=%d\n",SNR,n_trials,ack_nack_errors);
if((float)ack_nack_errors/(float)(nr_bit*n_trials)<=target_error_rate){
printf("PUCCH test OK\n");
break;