SC-FDMA implemented and compiling. (NOT TESTED)!!

openair1/PHY/NR_UE_TRANSPORT/nr_transport_proto_ue.h

@@ -1069,6 +1069,10 @@ void nr_pusch_codeword_scrambling(uint8_t *in,
                          uint32_t n_RNTI,
                          uint32_t* out);
 
+void pusch_transform_precoding(NR_UE_ULSCH_t *ulsch,
+                         NR_DL_FRAME_PARMS *frame_parms,
+                         int harq_pid);
+
 
 
 uint32_t  nr_dlsch_decoding_mthread(PHY_VARS_NR_UE *phy_vars_ue,

openair1/PHY/NR_UE_TRANSPORT/nr_transport_ue.h

@@ -138,10 +138,6 @@ typedef struct {
   uint32_t sumKr;
   /// Number of "Filler" bits
   uint32_t F;
-  /// Msc_initial, Initial number of subcarriers for ULSCH
-  uint16_t Msc_initial;
-  /// Nsymb_initial, Initial number of symbols for ULSCH
-  uint8_t Nsymb_initial;
   /// n_DMRS  for cyclic shift of DMRS
   uint8_t n_DMRS;
   /// n_DMRS2 for cyclic shift of DMRS
@@ -165,6 +161,8 @@ typedef struct {
 typedef struct {
   /// Current Number of Symbols
   uint8_t Nsymb_pusch;
+  /// Nsc_pusch, number of allocated subcarriers for ULSCH
+  uint16_t Nsc_pusch;
   /// number of DMRS resource elements
   uint8_t nb_re_dmrs;
   /// DMRS length
@@ -204,9 +202,9 @@ typedef struct {
   /// Scrambled "b"-sequences (for definition see 36-211 V8.6 2009-03, p.14)
   uint8_t b_tilde[MAX_NUM_NR_CHANNEL_BITS];
   /// Modulated "d"-sequences (for definition see 36-211 V8.6 2009-03, p.14)
-  int32_t d_mod[MAX_NUM_NR_RE] __attribute__ ((aligned(16)));
+  uint32_t d_mod[MAX_NUM_NR_RE] __attribute__ ((aligned(16)));
-  /// Transform-coded "z"-sequences (for definition see 36-211 V8.6 2009-03, p.14-15)
+  /// Transform-coded "y"-sequences (for definition see 38-211 V15.3.0 2018-09, subsection 6.3.1.4)
-  int32_t z[MAX_NUM_NR_RE];
+  uint32_t y[MAX_NUM_NR_RE];
   /*
   /// "q" sequences for CQI/PMI (for definition see 36-212 V8.6 2009-03, p.27)
   uint8_t q[MAX_CQI_PAYLOAD];

openair1/PHY/NR_UE_TRANSPORT/nr_ulsch_ue.c

@@ -30,9 +30,19 @@
 * \warning
 */
 #include <stdint.h>
+#include "PHY/NR_UE_TRANSPORT/nr_transport_ue.h"
 #include "common/utils/assertions.h"
 #include "PHY/NR_TRANSPORT/nr_transport_common_proto.h"
 #include "PHY/defs_nr_common.h"
+#include "PHY/TOOLS/tools_defs.h"
+
+//#define DEBUG_SCFDMA
+
+#ifdef DEBUG_SCFDMA
+
+  FILE *debug_scfdma;
+
+#endif
 
 
 
@@ -74,3 +84,100 @@ void nr_pusch_codeword_scrambling(uint8_t *in,
   }
 
 }
+
+
+void pusch_transform_precoding(NR_UE_ULSCH_t *ulsch, NR_DL_FRAME_PARMS *frame_parms, int harq_pid){
+
+  NR_UL_UE_HARQ_t *harq_process;
+  int16_t x[8192] = {0}; // 8192 is the maximum number of fft bins
+  uint32_t *dmod;
+  int sc, pusch_symb, pusch_sc;
+  int symb, k, l, num_mod_symb;
+
+  harq_process = ulsch->harq_processes[harq_pid];
+
+#ifdef DEBUG_SCFDMA
+  debug_scfdma = fopen("debug_scfdma.txt","w");
+#endif
+
+  dmod = ulsch->d_mod;
+  pusch_symb = ulsch->Nsymb_pusch;
+  pusch_sc = ulsch->Nsc_pusch;
+  num_mod_symb = harq_process->num_of_mod_symbols;
+
+  void (*dft)(int16_t *,int16_t *, int);
+
+  switch (frame_parms->ofdm_symbol_size) {
+  case 128:
+    dft = dft128;
+    break;
+
+  case 256:
+    dft = dft256;
+    break;
+
+  case 512:
+    dft = dft512;
+    break;
+
+  case 1024:
+    dft = dft1024;
+    break;
+
+  case 1536:
+    dft = dft1536;
+    break;
+
+  case 2048:
+    dft = dft2048;
+    break;
+
+  case 4096:
+    dft = dft4096;
+    break;
+
+  case 8192:
+    dft = dft8192;
+    break;
+
+  default:
+    dft = dft512;
+    break;
+  }
+
+  k = 0;
+  symb = 0;
+
+  for(l = 0; l < pusch_symb; l++){
+
+    for (sc = 0; sc < pusch_sc; sc++){
+
+      x[sc*2] = (symb<num_mod_symb)?(AMP*((int16_t *)dmod)[symb*2])>>15:0;
+      x[sc*2 + 1] = (symb<num_mod_symb)?(AMP*((int16_t *)dmod)[symb*2 + 1])>>15:0;
+
+  #ifdef DEBUG_SCFDMA
+      fprintf(debug_scfdma, "x[%d] = %d\n", symb*2, x[sc*2] );
+      fprintf(debug_scfdma, "x[%d] = %d\n", symb*2 + 1, x[sc*2 + 1] );
+  #endif
+
+      symb++;
+
+    }
+
+
+    dft(x, (int16_t *)&ulsch->y[l*pusch_sc], 1);
+
+  }
+
+#ifdef DEBUG_SCFDMA
+
+  for (symb = 0; symb < num_mod_symb; symb++)
+  {
+    fprintf(debug_scfdma, "ulsch->y[%d] = %d\n", symb*2, ((int16_t *)ulsch->y)[symb*2] );
+    fprintf(debug_scfdma, "ulsch->y[%d] = %d\n", symb*2 + 1, ((int16_t *)ulsch->y)[symb*2 + 1] );
+  }
+
+  fclose(debug_scfdma);
+#endif
+
+}

openair1/SIMULATION/NR_PHY/ulsim.c

@@ -507,6 +507,8 @@ int main(int argc, char **argv) {
     ulsch_ue[cwd]->nb_re_dmrs = nb_re_dmrs;
     ulsch_ue[cwd]->length_dmrs =  length_dmrs;
     ulsch_ue[cwd]->rnti = n_rnti;
+    ulsch_ue[cwd]->Nsc_pusch = nb_rb*NR_NB_SC_PER_RB;
+    ulsch_ue[cwd]->Nsymb_pusch = nb_symb_sch;
     ///////////
     ////////////////////////////////////////////////////////////////////////////////////////////
 
@@ -572,6 +574,8 @@ int main(int argc, char **argv) {
                   mod_order,
                   (int16_t *)ulsch_ue[cwd]->d_mod);
 
+    pusch_transform_precoding(ulsch_ue[cwd], frame_parms, harq_pid);
+
     ///////////
     ////////////////////////////////////////////////////////////////////////