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Fix LDPC ULSCH decoding (CRC NOK) for short LDPC code, e.g. Z_c is not multiple of 8

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This commit is contained in:
Khodr Saaifan
2020-11-27 15:56:15 +01:00
committed by Thomas Schlichter
parent 334bf336b7
commit 1488750db1
1 changed files with 15 additions and 24 deletions
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openair1/PHY/NR_TRANSPORT/nr_ulsch_decoding.c
+15 -24
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@@ -292,7 +292,7 @@ void nr_processULSegment(void* arg) {
int no_iteration_ldpc; int no_iteration_ldpc;
int Kr; int Kr;
int Kr_bytes; int Kr_bytes;
int K_bytes_F; int K_bits_F;
uint8_t crc_type; uint8_t crc_type;
int i; int i;
int j; int j;
@@ -318,8 +318,7 @@ void nr_processULSegment(void* arg) {
Kr = ulsch_harq->K; Kr = ulsch_harq->K;
Kr_bytes = Kr>>3; Kr_bytes = Kr>>3;
K_bits_F = Kr-ulsch_harq->F;
K_bytes_F = Kr_bytes-(ulsch_harq->F>>3);
t_nrLDPC_time_stats procTime; t_nrLDPC_time_stats procTime;
t_nrLDPC_time_stats* p_procTime = &procTime ; t_nrLDPC_time_stats* p_procTime = &procTime ;
@@ -402,23 +401,19 @@ void nr_processULSegment(void* arg) {
//start_meas(&phy_vars_gNB->ulsch_ldpc_decoding_stats); //start_meas(&phy_vars_gNB->ulsch_ldpc_decoding_stats);
memset(pv,0,2*ulsch_harq->Z*sizeof(int16_t)); //set first 2*Z_c bits to zeros
memset((pv+K_bytes_F),127,ulsch_harq->F*sizeof(int16_t)); memset(&z[0],0,2*ulsch_harq->Z*sizeof(int16_t));
//set Filler bits
for (i=((2*p_decoderParms->Z)>>3), j = 0; i < K_bytes_F; i++, j++) { memset((&z[0]+K_bits_F),127,ulsch_harq->F*sizeof(int16_t));
pv[i]= _mm_loadu_si128((__m128i*)(&ulsch_harq->d[r][8*j])); //Move coded bits before filler bits
} memcpy((&z[0]+2*ulsch_harq->Z),ulsch_harq->d[r],(K_bits_F-2*ulsch_harq->Z)*sizeof(int16_t));
//skip filler bits
AssertFatal(kc!=255,""); memcpy((&z[0]+Kr),ulsch_harq->d[r]+(Kr-2*ulsch_harq->Z),(kc*ulsch_harq->Z-Kr)*sizeof(int16_t));
j+=(ulsch_harq->F>>3); //Saturate coded bits before decoding into 8 bits values
for (i=Kr_bytes; i < ((kc*p_decoderParms->Z)>>3); i++, j++) { for (i=0, j=0; j < ((kc*ulsch_harq->Z)>>4)+1; i+=2, j++)
pv[i]= _mm_loadu_si128((__m128i*)(&ulsch_harq->d[r][8*j])); {
}
for (i=0, j=0; j < ((kc*p_decoderParms->Z)>>4); i+=2, j++) {
pl[j] = _mm_packs_epi16(pv[i],pv[i+1]); pl[j] = _mm_packs_epi16(pv[i],pv[i+1]);
} }
////////////////////////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////////////////////////
@@ -523,31 +518,27 @@ uint32_t nr_ulsch_decoding(PHY_VARS_gNB *phy_vars_gNB,
if ((A <=292) || ((A<=3824) && (Coderate <= 0.6667)) || Coderate <= 0.25){ if ((A <=292) || ((A<=3824) && (Coderate <= 0.6667)) || Coderate <= 0.25){
p_decParams->BG = 2; p_decParams->BG = 2;
kc = 52;
if (Coderate < 0.3333) { if (Coderate < 0.3333) {
p_decParams->R = 15; p_decParams->R = 15;
kc = 52;
} }
else if (Coderate <0.6667) { else if (Coderate <0.6667) {
p_decParams->R = 13; p_decParams->R = 13;
kc = 32;
} }
else { else {
p_decParams->R = 23; p_decParams->R = 23;
kc = 17;
} }
} else { } else {
p_decParams->BG = 1; p_decParams->BG = 1;
kc = 68;
if (Coderate < 0.6667) { if (Coderate < 0.6667) {
p_decParams->R = 13; p_decParams->R = 13;
kc = 68;
} }
else if (Coderate <0.8889) { else if (Coderate <0.8889) {
p_decParams->R = 23; p_decParams->R = 23;
kc = 35;
} }
else { else {
p_decParams->R = 89; p_decParams->R = 89;
kc = 27;
} }
} }