gNB: fix Resource mapping to support multiple layers DMRS generation

openair1/PHY/NR_TRANSPORT/nr_dlsch.c

@@ -153,10 +153,10 @@ uint8_t nr_generate_pdsch(PHY_VARS_gNB *gNB,
       n_dmrs = ((rel15->rbSize+rel15->rbStart)*4)<<1;
     }
     uint16_t nb_re;
-    nb_re = ((12*rel15->NrOfSymbols)-nb_re_dmrs-xOverhead)*rel15->rbSize*rel15->NrOfCodewords;
+    nb_re = ((12*rel15->NrOfSymbols)-nb_re_dmrs-xOverhead)*rel15->rbSize*rel15->nrOfLayers;
     uint8_t Qm = rel15->qamModOrder[0];
     uint32_t encoded_length = nb_re*Qm;
-    int16_t mod_dmrs[n_dmrs<<1] __attribute__ ((aligned(16)));
+    int16_t mod_dmrs[14][n_dmrs] __attribute__ ((aligned(16)));
     
     
     /// CRC, coding, interleaving and rate matching
@@ -253,7 +253,10 @@ uint8_t nr_generate_pdsch(PHY_VARS_gNB *gNB,
     
     
     l0 = get_l0(rel15->dlDmrsSymbPos);
-    nr_modulation(pdsch_dmrs[l0][0], n_dmrs, DMRS_MOD_ORDER, mod_dmrs); // currently only codeword 0 is modulated. Qm = 2 as DMRS is QPSK modulated
+    for (int l=rel15->StartSymbolIndex; l<rel15->StartSymbolIndex+rel15->NrOfSymbols; l++) {
+    	if (rel15->dlDmrsSymbPos & (1 << l))
+    		nr_modulation(pdsch_dmrs[l][0], n_dmrs, DMRS_MOD_ORDER, mod_dmrs[l]); // currently only codeword 0 is modulated. Qm = 2 as DMRS is QPSK modulated
+    }
     
 #ifdef DEBUG_DLSCH
     printf("DMRS modulation (single symbol %d, %d symbols, type %d):\n", l0, n_dmrs>>1, dmrs_Type);
@@ -293,17 +296,21 @@ uint8_t nr_generate_pdsch(PHY_VARS_gNB *gNB,
       uint16_t m=0, n=0, dmrs_idx=0, k=0;
       
       int txdataF_offset = (slot%2)*frame_parms->samples_per_slot_wCP;
-      if (dmrs_Type == NFAPI_NR_DMRS_TYPE1) // another if condition to be included to check pdsch config type (reference of k)
-	dmrs_idx = rel15->rbStart*6;
-      else
-	dmrs_idx = rel15->rbStart*4;
       
       for (int l=rel15->StartSymbolIndex; l<rel15->StartSymbolIndex+rel15->NrOfSymbols; l++) {
 	k = start_sc;
+	n = 0;
+	k_prime = 0;
+    if (dmrs_Type == NFAPI_NR_DMRS_TYPE1) // another if condition to be included to check pdsch config type (reference of k)
+	dmrs_idx = rel15->rbStart*6;
+    else
+	dmrs_idx = rel15->rbStart*4;
 	for (int i=0; i<rel15->rbSize*NR_NB_SC_PER_RB; i++) {
-	  if ((l == dmrs_symbol) && (k == ((start_sc+get_dmrs_freq_idx(n, k_prime, delta, dmrs_Type))%(frame_parms->ofdm_symbol_size)))) {
-	    ((int16_t*)txdataF[ap])[((l*frame_parms->ofdm_symbol_size + k)<<1) + (2*txdataF_offset)] = (Wt[l_prime[0]]*Wf[k_prime]*amp*mod_dmrs[dmrs_idx<<1]) >> 15;
-	    ((int16_t*)txdataF[ap])[((l*frame_parms->ofdm_symbol_size + k)<<1) + 1 + (2*txdataF_offset)] = (Wt[l_prime[0]]*Wf[k_prime]*amp*mod_dmrs[(dmrs_idx<<1) + 1]) >> 15;
+
+	  if ((rel15->dlDmrsSymbPos & (1 << l)) && (k == ((start_sc+get_dmrs_freq_idx(n, k_prime, delta, dmrs_Type))%(frame_parms->ofdm_symbol_size)))) {
+
+	    ((int16_t*)txdataF[ap])[((l*frame_parms->ofdm_symbol_size + k)<<1) + (2*txdataF_offset)] = (Wt[l_prime[0]]*Wf[k_prime]*amp*mod_dmrs[l][dmrs_idx<<1]) >> 15;
+	    ((int16_t*)txdataF[ap])[((l*frame_parms->ofdm_symbol_size + k)<<1) + 1 + (2*txdataF_offset)] = (Wt[l_prime[0]]*Wf[k_prime]*amp*mod_dmrs[l][(dmrs_idx<<1) + 1]) >> 15;
 #ifdef DEBUG_DLSCH_MAPPING
 	    printf("dmrs_idx %d\t l %d \t k %d \t k_prime %d \t n %d \t txdataF: %d %d\n",
 		   dmrs_idx, l, k, k_prime, n, ((int16_t*)txdataF[ap])[((l*frame_parms->ofdm_symbol_size + k)<<1) + (2*txdataF_offset)],
@@ -316,7 +323,7 @@ uint8_t nr_generate_pdsch(PHY_VARS_gNB *gNB,
 	  }
 	  
 	  else {
-	    if( (l != dmrs_symbol) || allowed_xlsch_re_in_dmrs_symbol(k,start_sc,rel15->numDmrsCdmGrpsNoData,dmrs_Type)) {
+	    if( (!(rel15->dlDmrsSymbPos & (1 << l))) || allowed_xlsch_re_in_dmrs_symbol(k,start_sc,rel15->numDmrsCdmGrpsNoData,dmrs_Type)) {
 	      ((int16_t*)txdataF[ap])[((l*frame_parms->ofdm_symbol_size + k)<<1) + (2*txdataF_offset)] = (amp * tx_layers[ap][m<<1]) >> 15;
 	      ((int16_t*)txdataF[ap])[((l*frame_parms->ofdm_symbol_size + k)<<1) + 1 + (2*txdataF_offset)] = (amp * tx_layers[ap][(m<<1) + 1]) >> 15;
 #ifdef DEBUG_DLSCH_MAPPING
@@ -332,6 +339,9 @@ uint8_t nr_generate_pdsch(PHY_VARS_gNB *gNB,
 	} //RE loop
       } // symbol loop
     }// layer loop
+
+    /// RE Precoding
+
     dlsch->slot_tx[slot]=0;
   }// dlsch loop
   return 0;