Commit a1da7a2f authored by Ahmed Hussein's avatar Ahmed Hussein Committed by Thomas Schlichter

Applying LDPC code fix at "nr_ulsch_decoding.c" (works for mcs 4 to 28)

parent d7abeed6
......@@ -187,7 +187,7 @@ uint32_t nr_ulsch_decoding(PHY_VARS_gNB *phy_vars_gNB,
uint32_t A,E;
uint32_t G;
uint32_t ret,offset;
int32_t no_iteration_ldpc;
int32_t no_iteration_ldpc, length_dec;
uint32_t r,r_offset=0,Kr=8424,Kr_bytes,K_bytes_F,err_flag=0;
uint8_t crc_type;
int8_t llrProcBuf[OAI_UL_LDPC_MAX_NUM_LLR] __attribute__ ((aligned(32)));
......@@ -206,12 +206,13 @@ uint32_t nr_ulsch_decoding(PHY_VARS_gNB *phy_vars_gNB,
int16_t z [68*384];
int8_t l [68*384];
int16_t inv_d [68*384];
uint8_t kb, kc;
uint8_t kc;
uint8_t Ilbrm = 0;
uint32_t Tbslbrm = 950984;
uint16_t nb_rb = 30; //to update
uint8_t nb_re_dmrs = 6;
uint16_t length_dmrs = 1;
double Coderate = 0.0;
uint32_t i,j;
......@@ -249,6 +250,7 @@ uint32_t nr_ulsch_decoding(PHY_VARS_gNB *phy_vars_gNB,
LOG_I(PHY,"ULSCH Decoding, harq_pid %d TBS %d G %d mcs %d Nl %d nb_symb_sch %d nb_rb %d\n",harq_pid,A,G, nfapi_ulsch_pdu_rel15->mcs, nfapi_ulsch_pdu_rel15->n_layers, nb_symb_sch,nb_rb);
if (harq_process->round == 0) {
// This is a new packet, so compute quantities regarding segmentation
harq_process->B = A+24;
......@@ -270,20 +272,43 @@ uint32_t nr_ulsch_decoding(PHY_VARS_gNB *phy_vars_gNB,
#endif
}
kb = harq_process->K/harq_process->Z;
Coderate = (float) A /(float) G;
if ( kb==22) {
p_decParams->BG = 1;
p_decParams->R = 13;
kc = 68;
} else {
if ((A <=292) || ((A<=3824) && (Coderate <= 0.6667)) || Coderate <= 0.25){
p_decParams->BG = 2;
p_decParams->R = 13;
kc = 52;
if (Coderate < 0.3333) {
p_decParams->R = 15;
kc = 52;
}
else if (Coderate <0.6667) {
p_decParams->R = 13;
kc = 32;
}
else {
p_decParams->R = 23;
kc = 17;
}
} else {
p_decParams->BG = 1;
if (Coderate < 0.6667) {
p_decParams->R = 13;
kc = 68;
}
else if (Coderate <0.8889) {
p_decParams->R = 23;
kc = 35;
}
else {
p_decParams->R = 89;
kc = 27;
}
}
//printf("coderate %f kc %d \n", Coderate, kc);
p_decParams->numMaxIter = ulsch->max_ldpc_iterations;
Kr = p_decParams->Z*kb;
p_decParams->outMode= 0;
err_flag = 0;
......@@ -410,10 +435,14 @@ uint32_t nr_ulsch_decoding(PHY_VARS_gNB *phy_vars_gNB,
memset(harq_process->c[r],0,Kr_bytes);
// printf("done\n");
if (harq_process->C == 1)
if (harq_process->C == 1) {
crc_type = CRC24_A;
else
length_dec = harq_process->B;
}
else {
crc_type = CRC24_B;
length_dec = (harq_process->B+24*harq_process->C)/harq_process->C;
}
if (err_flag == 0) {
......@@ -421,19 +450,18 @@ uint32_t nr_ulsch_decoding(PHY_VARS_gNB *phy_vars_gNB,
start_meas(ulsch_turbo_decoding_stats);
#endif
for (int cnt =0; cnt < (kc-2)*p_decParams->Z; cnt++) {
inv_d[cnt] = (1)*harq_process->d[r][cnt];
}
//LOG_E(PHY,"AbsSubframe %d.%d Start LDPC segment %d/%d A %d ",frame%1024,nr_tti_rx,r,harq_process->C-1, A);
memset(pv,0,2*harq_process->Z*sizeof(int16_t));
memset((pv+K_bytes_F),127,harq_process->F*sizeof(int16_t));
for (i=((2*p_decParams->Z)>>3), j = 0; i < K_bytes_F+((2*p_decParams->Z)>>3); i++, j++) {
pv[i]= _mm_loadu_si128((__m128i*)(&inv_d[8*j]));
for (i=((2*p_decParams->Z)>>3), j = 0; i < K_bytes_F; i++, j++) {
pv[i]= _mm_loadu_si128((__m128i*)(&harq_process->d[r][8*j]));
}
for (i=Kr_bytes+((2*p_decParams->Z)>>3),j=Kr_bytes; i < ((kc*p_decParams->Z)>>3); i++, j++) {
pv[i]= _mm_loadu_si128((__m128i*)(&inv_d[8*j]));
for (i=Kr_bytes,j=K_bytes_F-((2*p_decParams->Z)>>3); i < ((kc*p_decParams->Z)>>3); i++, j++) {
pv[i]= _mm_loadu_si128((__m128i*)(&harq_process->d[r][8*j]));
}
for (i=0, j=0; j < ((kc*p_decParams->Z)>>4); i+=2, j++) {
......@@ -455,8 +483,8 @@ uint32_t nr_ulsch_decoding(PHY_VARS_gNB *phy_vars_gNB,
p_nrLDPC_procBuf[r],
p_procTime);
if (check_crc(llrProcBuf,harq_process->B,harq_process->F,crc_type)) {
printf("CRC OK\n");
if (check_crc((uint8_t*)llrProcBuf,length_dec,harq_process->F,crc_type)) {
printf("Segment %d CRC OK\n",r);
ret = 2;
} else {
printf("CRC NOK\n");
......
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