generation of csi-rs sequence

openair1/PHY/INIT/nr_init.c

@@ -155,6 +155,23 @@ int phy_init_nr_gNB(PHY_VARS_gNB *gNB,
 
   nr_init_pdsch_dmrs(gNB, cfg->sch_config.physical_cell_id.value);
 
+  //CSI RS init
+  gNB->nr_gold_csi_rs = (uint32_t ***)malloc16(fp->slots_per_frame*sizeof(uint32_t **));
+  uint32_t ***csi_rs = gNB->nr_gold_csi_rs;
+  AssertFatal(csi_rs!=NULL, "NR init: csi reference signal malloc failed\n");
+
+  for (int slot=0; slot<fp->slots_per_frame; slot++) {
+    csi_rs[slot] = (uint32_t **)malloc16(fp->symbols_per_slot*sizeof(uint32_t *));
+    AssertFatal(csi_rs[slot]!=NULL, "NR init: csi reference signal for slot %d - malloc failed\n", slot);
+
+    for (int symb=0; symb<fp->symbols_per_slot; symb++) {
+      csi_rs[slot][symb] = (uint32_t *)malloc16(NR_MAX_CSI_RS_INIT_LENGTH_DWORD*sizeof(uint32_t));
+      AssertFatal(csi_rs[slot][symb]!=NULL, "NR init: csi reference signal for slot %d symbol %d - malloc failed\n", slot, symb);
+    }
+  }
+
+  nr_init_csi_rs(gNB, 0); // TODO scramblingID currently hardcoded to 0, to be taken from higher layer parameter scramblingID when implemented
+
   /// Transport init necessary for NR synchro
   init_nr_transport(gNB);
 

openair1/PHY/NR_REFSIG/nr_gold.c

@@ -65,7 +65,7 @@ void nr_init_pdcch_dmrs(PHY_VARS_gNB* gNB, uint32_t Nid)
     for (uint8_t symb=0; symb<fp->symbols_per_slot; symb++) {
 
       reset = 1;
-      x2 = ((1<<17) * (14*slot+symb+1) * ((Nid<<1)+1) + (Nid<<1));
+      x2 = ((1<<17) * (fp->symbols_per_slot*slot+symb+1) * ((Nid<<1)+1) + (Nid<<1));
 
       for (uint32_t n=0; n<NR_MAX_PDCCH_DMRS_INIT_LENGTH_DWORD; n++) {
         pdcch_dmrs[slot][symb][n] = lte_gold_generic(&x1, &x2, reset);
@@ -157,3 +157,25 @@ void nr_gold_pusch(PHY_VARS_gNB* gNB, unsigned short lbar,unsigned short *n_idDM
     }
   }
 }
+
+void nr_init_csi_rs(PHY_VARS_gNB* gNB, uint32_t Nid)
+{
+  NR_DL_FRAME_PARMS *fp = &gNB->frame_parms;
+  uint32_t ***csi_rs = gNB->nr_gold_csi_rs;
+  uint32_t x1, x2;
+  uint8_t reset;
+
+  for (uint8_t slot=0; slot<fp->slots_per_frame; slot++) {
+    for (uint8_t symb=0; symb<fp->symbols_per_slot; symb++) {
+
+      reset = 1;
+      x2 = ((1<<10) * (fp->symbols_per_slot*slot+symb+1) * ((Nid<<1)+1) + (Nid));
+
+      for (uint32_t n=0; n<NR_MAX_PDCCH_DMRS_INIT_LENGTH_DWORD; n++) {
+        csi_rs[slot][symb][n] = lte_gold_generic(&x1, &x2, reset);
+        reset = 0;
+      }
+    }  
+  }
+
+}

openair1/PHY/NR_REFSIG/nr_refsig.h

@@ -38,6 +38,7 @@ void nr_init_pbch_dmrs(PHY_VARS_gNB* gNB);
  */
 void nr_init_pdcch_dmrs(PHY_VARS_gNB* gNB, uint32_t Nid);
 void nr_init_pdsch_dmrs(PHY_VARS_gNB* gNB, uint32_t Nid);
+void nr_init_csi_rs(PHY_VARS_gNB* gNB, uint32_t Nid);
 
 void nr_gold_pusch(PHY_VARS_gNB* gNB, unsigned short lbar,unsigned short *n_idDMRS, unsigned short length_dmrs);
 

openair1/PHY/defs_gNB.h

@@ -673,6 +673,9 @@ typedef struct PHY_VARS_gNB_s {
   /// PUSCH DMRS
   uint32_t nr_gold_pusch[2][20][2][NR_MAX_PUSCH_DMRS_INIT_LENGTH_DWORD];
 
+  /// CSI  RS sequence
+  uint32_t ***nr_gold_csi_rs;
+
   /// Indicator set to 0 after first SR
   uint8_t first_sr[NUMBER_OF_UE_MAX];
 

openair1/PHY/defs_nr_common.h

@@ -82,6 +82,9 @@
 #define NR_MAX_PDSCH_DMRS_LENGTH 3300      //275*6(k)*2(QPSK real+imag) 
 #define NR_MAX_PDSCH_DMRS_INIT_LENGTH_DWORD 104  // ceil(NR_MAX_PDSCH_DMRS_LENGTH/32)
 
+#define NR_MAX_CSI_RS_LENGTH 5500 //275*10(max allocation per RB)*2(QPSK)
+#define NR_MAX_CSI_RS_INIT_LENGTH_DWORD 172  // ceil(NR_MAX_CSI_RS_LENGTH/32)
+
 #define NR_MAX_PUSCH_DMRS_LENGTH NR_MAX_PDSCH_DMRS_LENGTH 
 #define NR_MAX_PUSCH_DMRS_INIT_LENGTH_DWORD NR_MAX_PDSCH_DMRS_INIT_LENGTH_DWORD