fixing reference point for k in pusch dmrs

openair1/PHY/NR_ESTIMATION/nr_ul_channel_estimation.c

@@ -116,7 +116,10 @@ int nr_pusch_channel_estimation(PHY_VARS_gNB *gNB,
 
   //------------------generate DMRS------------------//
 
-  nr_pusch_dmrs_rx(gNB, Ns, gNB->nr_gold_pusch_dmrs[pusch_pdu->scid][Ns][symbol], &pilot[0], 1000, 0, nb_rb_pusch, pusch_pdu->dmrs_config_type);
+  if (pusch_pdu->transform_precoding) // if transform precoding is disabled
+    nr_pusch_dmrs_rx(gNB, Ns, gNB->nr_gold_pusch_dmrs[pusch_pdu->scid][Ns][symbol], &pilot[0], 1000, 0, nb_rb_pusch, pusch_pdu->rb_start*NR_NB_SC_PER_RB, pusch_pdu->dmrs_config_type);
+  else
+    nr_pusch_dmrs_rx(gNB, Ns, gNB->nr_gold_pusch_dmrs[pusch_pdu->scid][Ns][symbol], &pilot[0], 1000, 0, nb_rb_pusch, 0, pusch_pdu->dmrs_config_type);
 
   //------------------------------------------------//
 

openair1/PHY/NR_REFSIG/nr_dmrs_rx.c

@@ -45,7 +45,7 @@ int wt1[8][2] = {{1,1},{1,1},{1,1},{1,1},{1,-1},{1,-1},{1,-1},{1,-1}};
 int wf2[12][2] = {{1,1},{1,-1},{1,1},{1,-1},{1,1},{1,-1},{1,1},{1,1},{1,1},{1,-1},{1,1},{1,1}};
 int wt2[12][2] = {{1,1},{1,1},{1,1},{1,1},{1,1},{1,1},{1,-1},{1,-1},{1,-1},{1,-1},{1,-1},{1,-1}};
 
-
+// complex conjugate of mod table
 short nr_rx_mod_table[14]  = {0,0,23170,-23170,-23170,23170,23170,-23170,23170,23170,-23170,-23170,-23170,23170};
 short nr_rx_nmod_table[14] = {0,0,-23170,23170,23170,-23170,-23170,23170,-23170,-23170,23170,23170,23170,-23170};
 
@@ -57,6 +57,7 @@ int nr_pusch_dmrs_rx(PHY_VARS_gNB *gNB,
                      unsigned short p,
                      unsigned char lp,
                      unsigned short nb_pusch_rb,
+                     uint32_t re_offset,
                      uint8_t dmrs_type)
 {
   int8_t w, nb_dmrs;
@@ -66,7 +67,6 @@ int nr_pusch_dmrs_rx(PHY_VARS_gNB *gNB,
   typedef int array_of_w[2];
   array_of_w *wf;
   array_of_w *wt;
-
   wf = (dmrs_type==pusch_dmrs_type1) ? wf1 : wf2;
   wt = (dmrs_type==pusch_dmrs_type1) ? wt1 : wt2;
 
@@ -76,7 +76,7 @@ int nr_pusch_dmrs_rx(PHY_VARS_gNB *gNB,
   if ((p>=1000) && (p<((dmrs_type==pusch_dmrs_type1) ? 1008 : 1012))) {
       if (gNB->frame_parms.Ncp == NORMAL) {
         nb_dmrs = ((dmrs_type==pusch_dmrs_type1) ? 6:4);
-        for (int i=0; i<nb_pusch_rb*nb_dmrs; i++) {
+        for (int i=re_offset; i<re_offset+(nb_pusch_rb*nb_dmrs); i++) {
 
           w = (wf[p-1000][i&1])*(wt[p-1000][lp]);
           mod_table = (w==1) ? nr_rx_mod_table : nr_rx_nmod_table;
@@ -90,6 +90,7 @@ int nr_pusch_dmrs_rx(PHY_VARS_gNB *gNB,
           printf("i %d idx %d pusch gold %u b0-b1 %d-%d mod_dmrs %d %d\n", i, idx, nr_gold_pusch[(i<<1)>>5], (((nr_gold_pusch[(i<<1)>>5])>>((i<<1)&0x1f))&1),
           (((nr_gold_pusch[((i<<1)+1)>>5])>>(((i<<1)+1)&0x1f))&1), ((int16_t*)output)[i<<1], ((int16_t*)output)[(i<<1)+1]);
 #endif
+
         }
       } else {
         LOG_E(PHY,"extended cp not supported for PUSCH DMRS yet\n");

openair1/PHY/NR_REFSIG/nr_refsig.h

@@ -48,5 +48,6 @@ int nr_pusch_dmrs_rx(PHY_VARS_gNB *gNB,
                      unsigned short p,
                      unsigned char lp,
                      unsigned short nb_pusch_rb,
+                     uint32_t re_offset,
                      uint8_t dmrs_type);
 #endif

openair2/LAYER2/NR_MAC_gNB/gNB_scheduler_RA.c

@@ -473,6 +473,8 @@ void nr_add_msg3(module_id_t module_idP, int CC_id, frame_t frameP, sub_frame_t
   pusch_pdu->dmrs_config_type = 0;
   pusch_pdu->ul_dmrs_scrambling_id = *scc->physCellId; //If provided and the PUSCH is not a msg3 PUSCH, otherwise, L2 should set this to physical cell id.
   pusch_pdu->scid = 0; //DMRS sequence initialization [TS38.211, sec 6.4.1.1.1]. Should match what is sent in DCI 0_1, otherwise set to 0.
+  pusch_pdu->dmrs_ports = 1;  // 6.2.2 in 38.214 only port 0 to be used
+  pusch_pdu->num_dmrs_cdm_grps_no_data = 2;  // no data in dmrs symbols as in 6.2.2 in 38.214
   pusch_pdu->resource_alloc = 1; //type 1
   pusch_pdu->rb_start = ra->msg3_first_rb + ibwp_start - abwp_start; // as for 6.3.1.7 in 38.211
   if (ra->msg3_nb_rb > pusch_pdu->bwp_size)
@@ -621,7 +623,7 @@ void nr_generate_Msg2(module_id_t module_idP,
     pdsch_pdu_rel15->dmrsConfigType = 0;
     pdsch_pdu_rel15->dlDmrsScramblingId = *scc->physCellId;
     pdsch_pdu_rel15->SCID = 0;
-    pdsch_pdu_rel15->numDmrsCdmGrpsNoData = 1;
+    pdsch_pdu_rel15->numDmrsCdmGrpsNoData = 2;
     pdsch_pdu_rel15->dmrsPorts = 1;
     pdsch_pdu_rel15->resourceAlloc = 1;
     pdsch_pdu_rel15->rbStart = 0;