PUSCH Rx channel estimation supporting DMRS type 2

- nr_ulsim supports multiple DMRS configurations

openair1/PHY/NR_ESTIMATION/nr_ul_channel_estimation.c

@@ -23,6 +23,7 @@
 #include <string.h>
 
 #include "nr_ul_estimation.h"
+#include "PHY/sse_intrin.h"
 #include "PHY/NR_REFSIG/nr_refsig.h"
 #include "PHY/NR_UE_ESTIMATION/filt16a_32.h"
 
@@ -35,18 +36,19 @@ int nr_pusch_channel_estimation(PHY_VARS_gNB *gNB,
                                 unsigned short p,
                                 unsigned char symbol,
                                 unsigned short bwp_start_subcarrier,
-                                unsigned short nb_rb_pusch)
+                                unsigned short nb_rb_pusch,
+                                dmrs_UplinkConfig_t *dmrs_UplinkConfig)
 {
   int pilot[3280] __attribute__((aligned(16)));
   unsigned char aarx;
   unsigned short k;
-  unsigned int pilot_cnt;
-  int16_t ch[2],*pil,*rxF,*ul_ch;
+  unsigned int pilot_cnt,re_cnt;
+  int16_t ch[2],ch_r[2],ch_l[2],*pil,*rxF,*ul_ch;
   int16_t *fl,*fm,*fr,*fml,*fmr,*fmm,*fdcl,*fdcr,*fdclh,*fdcrh;
   int ch_offset,symbol_offset, length_dmrs, UE_id = 0;
   unsigned short n_idDMRS[2] = {0,1}; //to update from pusch config
-  int32_t temp_in_ifft_0[8192*2] __attribute__((aligned(32)));
   int32_t **ul_ch_estimates_time =  gNB->pusch_vars[UE_id]->ul_ch_estimates_time;
+  __m128i *ul_ch_128;
 
 #ifdef DEBUG_CH
   FILE *debug_ch_est;
@@ -115,7 +117,7 @@ int nr_pusch_channel_estimation(PHY_VARS_gNB *gNB,
 
   nr_gold_pusch(gNB, symbol, n_idDMRS, length_dmrs);
 
-  nr_pusch_dmrs_rx(gNB, Ns, gNB->nr_gold_pusch[gNB_offset][Ns][0], &pilot[0], 1000, 0, nb_rb_pusch);
+  nr_pusch_dmrs_rx(gNB, Ns, gNB->nr_gold_pusch[gNB_offset][Ns][0], &pilot[0], 1000, 0, nb_rb_pusch, dmrs_UplinkConfig->pusch_dmrs_type);
 
   //------------------------------------------------//
 
@@ -135,6 +137,9 @@ int nr_pusch_channel_estimation(PHY_VARS_gNB *gNB,
 #endif
     //if ((gNB->frame_parms.N_RB_UL&1)==0) {
 
+
+    if (dmrs_UplinkConfig->pusch_dmrs_type == pusch_dmrs_type1){
+
       // Treat first 2 pilots specially (left edge)
       ch[0] = (int16_t)(((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15);
       ch[1] = (int16_t)(((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15);
@@ -144,6 +149,7 @@ int nr_pusch_channel_estimation(PHY_VARS_gNB *gNB,
       printf("pilot 0 : rxF - > (%d,%d) addr %p  ch -> (%d,%d), pil -> (%d,%d) \n",rxF[0],rxF[1],&rxF[0],ch[0],ch[1],pil[0],pil[1]);
       printf("data 0 : rxF - > (%d,%d) addr %p  ch -> (%d,%d), pil -> (%d,%d) \n",rxF[2],rxF[3],&rxF[2],ch[0],ch[1],pil[0],pil[1]);
 #endif
+
       multadd_real_vector_complex_scalar(fl,
                                          ch,
                                          ul_ch,
@@ -192,28 +198,33 @@ int nr_pusch_channel_estimation(PHY_VARS_gNB *gNB,
 
         ch[0] = (int16_t)(((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15);
         ch[1] = (int16_t)(((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15);
-#ifdef DEBUG_CH
-    fprintf(debug_ch_est, "pilot %d : rxF - > (%d,%d) ch -> (%d,%d), pil -> (%d,%d) \n",pilot_cnt,rxF[0],rxF[1],ch[0],ch[1],pil[0],pil[1]);
-	//printf("pilot %d : rxF - > (%d,%d) ch -> (%d,%d), pil -> (%d,%d) \n",pilot_cnt,rxF[0],rxF[1],ch[0],ch[1],pil[0],pil[1]);
-#endif
-        multadd_real_vector_complex_scalar(fm,
+
+  #ifdef DEBUG_PUSCH
+        printf("pilot 1 : rxF - > (%d,%d) ch -> (%d,%d), pil -> (%d,%d) \n",rxF[0],rxF[1],ch[0],ch[1],pil[0],pil[1]);
+  #endif
+        multadd_real_vector_complex_scalar(fml,
                                            ch,
                                            ul_ch,
                                            8);
-
         pil+=2;
         re_offset = (re_offset+2) % gNB->frame_parms.ofdm_symbol_size;
         rxF   = (int16_t *)&rxdataF[aarx][(symbol_offset+nushift+re_offset)];
+        //printf("ul_ch addr %p\n",ul_ch);
 
         ch[0] = (int16_t)(((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15);
         ch[1] = (int16_t)(((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15);
-#ifdef DEBUG_PUSCH
-	printf("pilot %d : rxF - > (%d,%d) ch -> (%d,%d), pil -> (%d,%d) \n",pilot_cnt+1,rxF[0],rxF[1],ch[0],ch[1],pil[0],pil[1]);
-#endif
+
+  #ifdef DEBUG_PUSCH
+        printf("pilot 2 : rxF - > (%d,%d) ch -> (%d,%d), pil -> (%d,%d) \n",rxF[0],rxF[1],ch[0],ch[1],pil[0],pil[1]);
+  #endif
         multadd_real_vector_complex_scalar(fmm,
                                            ch,
                                            ul_ch,
                                            8);
+
+        //for (int i= 0; i<16; i++)
+        //printf("ul_ch addr %p %d\n", ul_ch+i, *(ul_ch+i));
+
         pil+=2;
         re_offset = (re_offset+2) % gNB->frame_parms.ofdm_symbol_size;
         rxF   = (int16_t *)&rxdataF[aarx][(symbol_offset+nushift+re_offset)];
@@ -328,65 +339,153 @@ int nr_pusch_channel_estimation(PHY_VARS_gNB *gNB,
       printf("%d\n",idxP);
     }
 #endif    
+    
+    } else { //pusch_dmrs_type2  |p_r,p_l,d,d,d,d,p_r,p_l,d,d,d,d|
+
+      // Treat first DMRS specially (left edge)
+
+        rxF   = (int16_t *)&rxdataF[aarx][(symbol_offset+nushift+re_offset)];
+
+        ul_ch[0] = (int16_t)(((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15);
+        ul_ch[1] = (int16_t)(((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15);
+
+        pil+=2;
+        ul_ch+=2;
+        re_offset = (re_offset + 1)%gNB->frame_parms.ofdm_symbol_size;
+        ch_offset++;
+
+        for (re_cnt = 1; re_cnt < (nb_rb_pusch*NR_NB_SC_PER_RB) - 5; re_cnt+=6){
+
+          rxF   = (int16_t *)&rxdataF[aarx][(symbol_offset+nushift+re_offset)];
+
+          ch_l[0] = (int16_t)(((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15);
+          ch_l[1] = (int16_t)(((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15);
+
+          ul_ch[0] = ch_l[0];
+          ul_ch[1] = ch_l[1];
+
+          pil+=2;
+          ul_ch+=2;
+          ch_offset++;
+
+          multadd_real_four_symbols_vector_complex_scalar(filt8_ml2,
+                                                          ch_l,
+                                                          ul_ch);
+
+          re_offset = (re_offset+5)%gNB->frame_parms.ofdm_symbol_size;
+
+          rxF   = (int16_t *)&rxdataF[aarx][(symbol_offset+nushift+re_offset)];
+
+          ch_r[0] = (int16_t)(((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15);
+          ch_r[1] = (int16_t)(((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15);
+
+
+          multadd_real_four_symbols_vector_complex_scalar(filt8_mr2,
+                                                          ch_r,
+                                                          ul_ch);
+
+          //for (int re_idx = 0; re_idx < 8; re_idx+=2)
+            //printf("ul_ch = %d + j*%d\n", ul_ch[re_idx], ul_ch[re_idx+1]);
+
+          ul_ch+=8;
+          ch_offset+=4;
+
+          ul_ch[0] = ch_r[0];
+          ul_ch[1] = ch_r[1];
+
+          pil+=2;
+          ul_ch+=2;
+          ch_offset++;
+          re_offset = (re_offset + 1)%gNB->frame_parms.ofdm_symbol_size;
+
+        }
+
+        // Treat last pilot specially (right edge)
+
+        rxF   = (int16_t *)&rxdataF[aarx][(symbol_offset+nushift+re_offset)];
+
+        ch_l[0] = (int16_t)(((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15);
+        ch_l[1] = (int16_t)(((int32_t)pil[0]*rxF[1] + (int32_t)pil[1]*rxF[0])>>15);
+
+        ul_ch[0] = ch_l[0];
+        ul_ch[1] = ch_l[1];
+
+        ul_ch+=2;
+        ch_offset++;
+
+        multadd_real_four_symbols_vector_complex_scalar(filt8_rr1,
+                                                        ch_l,
+                                                        ul_ch);
+
+        multadd_real_four_symbols_vector_complex_scalar(filt8_rr2,
+                                                        ch_r,
+                                                        ul_ch);
+
+        ul_ch_128 = (__m128i *)&ul_ch_estimates[aarx][ch_offset];
+
+        ul_ch_128[0] = _mm_slli_epi16 (ul_ch_128[0], 2);
+  }
+
+
+
     // Convert to time domain
-    memset(temp_in_ifft_0, 0, gNB->frame_parms.ofdm_symbol_size*sizeof(int32_t));
-    memcpy(temp_in_ifft_0, &ul_ch_estimates[aarx][symbol_offset], nb_rb_pusch * NR_NB_SC_PER_RB * sizeof(int32_t));
 
       switch (gNB->frame_parms.ofdm_symbol_size) {
         case 128:
-        idft128((int16_t*) temp_in_ifft_0,
+          idft128((int16_t*) &ul_ch_estimates[aarx][symbol_offset],
                  (int16_t*) ul_ch_estimates_time[aarx],
                  1);
           break;
 
         case 256:
-        idft256((int16_t*) temp_in_ifft_0,
+          idft256((int16_t*) &ul_ch_estimates[aarx][symbol_offset],
                  (int16_t*) ul_ch_estimates_time[aarx],
                  1);
           break;
 
         case 512:
-        idft512((int16_t*) temp_in_ifft_0,
+          idft512((int16_t*) &ul_ch_estimates[aarx][symbol_offset],
                  (int16_t*) ul_ch_estimates_time[aarx],
                  1);
           break;
 
         case 1024:
-        idft1024((int16_t*) temp_in_ifft_0,
+          idft1024((int16_t*) &ul_ch_estimates[aarx][symbol_offset],
                  (int16_t*) ul_ch_estimates_time[aarx],
                  1);
           break;
 
         case 1536:
-        idft1536((int16_t*) temp_in_ifft_0,
+          idft1536((int16_t*) &ul_ch_estimates[aarx][symbol_offset],
                  (int16_t*) ul_ch_estimates_time[aarx],
                  1);
           break;
 
         case 2048:
-        idft2048((int16_t*) temp_in_ifft_0,
+          idft2048((int16_t*) &ul_ch_estimates[aarx][symbol_offset],
                  (int16_t*) ul_ch_estimates_time[aarx],
                  1);
           break;
 
         case 4096:
-        idft4096((int16_t*) temp_in_ifft_0,
+          idft4096((int16_t*) &ul_ch_estimates[aarx][symbol_offset],
                  (int16_t*) ul_ch_estimates_time[aarx],
                  1);
           break;
 
         case 8192:
-        idft8192((int16_t*) temp_in_ifft_0,
+          idft8192((int16_t*) &ul_ch_estimates[aarx][symbol_offset],
                  (int16_t*) ul_ch_estimates_time[aarx],
                  1);
           break;
 
         default:
-        idft512((int16_t*) temp_in_ifft_0,
+          idft512((int16_t*) &ul_ch_estimates[aarx][symbol_offset],
                  (int16_t*) ul_ch_estimates_time[aarx],
                  1);
           break;
       }
+
   }
 
 #ifdef DEBUG_CH

openair1/PHY/NR_ESTIMATION/nr_ul_estimation.h

@@ -45,7 +45,8 @@
 				                     unsigned short p,
 				                     unsigned char symbol,
 				                     unsigned short bwp_start_subcarrier,
-				                     unsigned short nb_rb_pusch);
+				                     unsigned short nb_rb_pusch,
+				                     dmrs_UplinkConfig_t *dmrs_UplinkConfig);
 
 int nr_est_timing_advance_pusch(PHY_VARS_gNB* phy_vars_gNB, int UE_id);
 

openair1/PHY/NR_REFSIG/nr_dmrs_rx.c

@@ -56,9 +56,10 @@ int nr_pusch_dmrs_rx(PHY_VARS_gNB *gNB,
                      int32_t *output,
                      unsigned short p,
                      unsigned char lp,
-                     unsigned short nb_pusch_rb)
+                     unsigned short nb_pusch_rb,
+                     uint8_t dmrs_type)
 {
-  int8_t w,config_type;
+  int8_t w;
   short *mod_table;
   unsigned char idx=0;
 
@@ -66,18 +67,16 @@ int nr_pusch_dmrs_rx(PHY_VARS_gNB *gNB,
   array_of_w *wf;
   array_of_w *wt;
 
-  config_type = 0; //to be updated by higher layer
+  wf = (dmrs_type==pusch_dmrs_type1) ? wf1 : wf2;
+  wt = (dmrs_type==pusch_dmrs_type1) ? wt1 : wt2;
 
-  wf = (config_type==0) ? wf1 : wf2;
-  wt = (config_type==0) ? wt1 : wt2;
+  if (dmrs_type > 2)
+    LOG_E(PHY,"Bad PUSCH DMRS config type %d\n", dmrs_type);
 
-  if (config_type > 1)
-    LOG_E(PHY,"Bad PUSCH DMRS config type %d\n", config_type);
-
-  if ((p>=1000) && (p<((config_type==0) ? 1008 : 1012))) {
+  if ((p>=1000) && (p<((dmrs_type==pusch_dmrs_type1) ? 1008 : 1012))) {
       if (gNB->frame_parms.Ncp == NORMAL) {
 
-        for (int i=0; i<nb_pusch_rb*((config_type==0) ? 6:4); i++) {
+        for (int i=0; i<nb_pusch_rb*((dmrs_type==pusch_dmrs_type1) ? 6:4); i++) {
 
           w = (wf[p-1000][i&1])*(wt[p-1000][lp]);
           mod_table = (w==1) ? nr_rx_mod_table : nr_rx_nmod_table;
@@ -86,7 +85,7 @@ int nr_pusch_dmrs_rx(PHY_VARS_gNB *gNB,
         ((int16_t*)output)[i<<1] = mod_table[(NR_MOD_TABLE_QPSK_OFFSET + idx)<<1];
         ((int16_t*)output)[(i<<1)+1] = mod_table[((NR_MOD_TABLE_QPSK_OFFSET + idx)<<1) + 1];
 #ifdef DEBUG_PUSCH
-        printf("nr_pusch_dmrs_rx dmrs config type %d port %d nb_pusch_rb %d\n", config_type, p, nb_pusch_rb);
+        printf("nr_pusch_dmrs_rx dmrs config type %d port %d nb_pusch_rb %d\n", dmrs_type, p, nb_pusch_rb);
         printf("wf[%d] = %d wt[%d]= %d\n", i&1, wf[p-1000][i&1], lp, wt[p-1000][lp]);
         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]);

openair1/PHY/NR_REFSIG/nr_refsig.h

@@ -47,5 +47,6 @@ int nr_pusch_dmrs_rx(PHY_VARS_gNB *gNB,
                      int32_t *output,
                      unsigned short p,
                      unsigned char lp,
-                     unsigned short nb_pusch_rb);
+                     unsigned short nb_pusch_rb,
+                     uint8_t dmrs_type);
 #endif

openair1/PHY/NR_TRANSPORT/nr_transport_proto.h

@@ -75,15 +75,18 @@ void nr_ulsch_extract_rbs_single(int **rxdataF,
                                  unsigned short start_rb,
                                  unsigned short nb_rb_pusch,
                                  NR_DL_FRAME_PARMS *frame_parms,
-                                 uint8_t is_dmrs_symbol,
-                                 uint8_t dmrs_symbol);
+                                 uint8_t dmrs_symbol,
+                                 uint16_t number_symbols,
+                                 uint8_t mapping_type,
+                                 dmrs_UplinkConfig_t *dmrs_UplinkConfig);
 
 void nr_ulsch_scale_channel(int32_t **ul_ch_estimates_ext,
                             NR_DL_FRAME_PARMS *frame_parms,
                             NR_gNB_ULSCH_t **ulsch_gNB,
                             uint8_t symbol,
                             uint8_t start_symbol,
-                            uint16_t nb_rb);
+                            uint16_t nb_rb,
+                            pusch_dmrs_type_t pusch_dmrs_type);
 
 
 /** \brief This function computes the average channel level over all allocated RBs and antennas (TX/RX) in order to compute output shift for compensated signal

openair1/PHY/NR_TRANSPORT/nr_ulsch_demodulation.c

@@ -231,21 +231,25 @@ void nr_ulsch_extract_rbs_single(int **rxdataF,
                                  unsigned short start_rb,
                                  unsigned short nb_rb_pusch,
                                  NR_DL_FRAME_PARMS *frame_parms,
-                                 uint8_t is_dmrs_symbol,
-                                 uint8_t dmrs_symbol)
+                                 uint8_t dmrs_symbol,
+                                 uint16_t number_symbols,
+                                 uint8_t mapping_type,
+                                 dmrs_UplinkConfig_t *dmrs_UplinkConfig)
 {
   unsigned short start_re, re, nb_re_pusch;
   unsigned char aarx;
   uint32_t rxF_ext_index = 0;
   uint32_t ul_ch0_ext_index = 0;
   uint32_t ul_ch0_index = 0;
+  uint8_t is_dmrs_symbol_flag, k_prime;
+  uint16_t n=0;
 
   int16_t *rxF,*rxF_ext;
   int *ul_ch0,*ul_ch0_ext;
 
 #ifdef DEBUG_RB_EXT
 
-  printf("--------------------symbol = %d, is_dmrs_symbol = %u-----------------------\n", symbol, is_dmrs_symbol);
+  printf("--------------------symbol = %d-----------------------\n", symbol);
   printf("--------------------ch_ext_index = %d-----------------------\n", symbol*NR_NB_SC_PER_RB * nb_rb_pusch);
 
 #endif
@@ -253,6 +257,7 @@ void nr_ulsch_extract_rbs_single(int **rxdataF,
   start_re = (frame_parms->first_carrier_offset + (start_rb * NR_NB_SC_PER_RB))%frame_parms->ofdm_symbol_size;
   
   nb_re_pusch = NR_NB_SC_PER_RB * nb_rb_pusch;
+  is_dmrs_symbol_flag = 0;
 
   for (aarx = 0; aarx < frame_parms->nb_antennas_rx; aarx++) {
     
@@ -263,26 +268,44 @@ void nr_ulsch_extract_rbs_single(int **rxdataF,
 
     ul_ch0_ext = &ul_ch_estimates_ext[aarx][symbol*nb_re_pusch];
 
+    n = 0;
+    k_prime = 0;
+
     for (re = 0; re < nb_re_pusch; re++) {
 
-      if ( (is_dmrs_symbol && ((re&1) != 0))    ||    (is_dmrs_symbol == 0) ) { // [hna] (re&1) != frame_parms->nushift) assuming only dmrs type 1 and mapping type A
-                                                                                // frame_parms->nushift should be initialized with 0
+      is_dmrs_symbol_flag =  is_dmrs_symbol(symbol,
+                                            (start_re + re)%frame_parms->ofdm_symbol_size,
+                                            start_re,
+                                            k_prime,
+                                            n,
+                                            0,
+                                            number_symbols,
+                                            dmrs_UplinkConfig,
+                                            mapping_type,
+                                            frame_parms->ofdm_symbol_size);
+  #ifdef DEBUG_RB_EXT
+      printf("re = %d, is_dmrs_symbol_flag = %d, symbol = %d\n", re, is_dmrs_symbol_flag, symbol);
+  #endif
+
+      if ( is_dmrs_symbol_flag == 0 ) {
+
         rxF_ext[rxF_ext_index]     = (rxF[ ((start_re + re)*2)      % (frame_parms->ofdm_symbol_size*2)]);
         rxF_ext[rxF_ext_index + 1] = (rxF[(((start_re + re)*2) + 1) % (frame_parms->ofdm_symbol_size*2)]);
         ul_ch0_ext[ul_ch0_ext_index] = ul_ch0[ul_ch0_index];
 
-        ul_ch0_ext_index++;
-        rxF_ext_index = rxF_ext_index + 2;
-      }
-
-      ul_ch0_index++;
-
   #ifdef DEBUG_RB_EXT
         printf("rxF_ext[%d] = %d\n", rxF_ext_index, rxF_ext[rxF_ext_index]);
         printf("rxF_ext[%d] = %d\n", rxF_ext_index+1, rxF_ext[rxF_ext_index+1]);
-        printf("ul_ch0_ext[%d] = %d\n", 2*rxF_ext_index, ((int16_t *)ul_ch0_ext)[2*rxF_ext_index]);
-        printf("ul_ch0_ext[%d] = %d\n", 2*rxF_ext_index + 1, ((int16_t *)ul_ch0_ext)[2*rxF_ext_index + 1]);
   #endif
+
+        ul_ch0_ext_index++;
+        rxF_ext_index +=2;
+      } else {
+        k_prime++;
+        k_prime&=1;
+        n+=(k_prime)?0:1;
+      }
+      ul_ch0_index++;
     }
   }
 }
@@ -292,7 +315,8 @@ void nr_ulsch_scale_channel(int **ul_ch_estimates_ext,
                             NR_gNB_ULSCH_t **ulsch_gNB,
                             uint8_t symbol,
                             uint8_t is_dmrs_symbol,
-                            unsigned short nb_rb)
+                            unsigned short nb_rb,
+                            pusch_dmrs_type_t pusch_dmrs_type)
 {
 
 #if defined(__x86_64__)||defined(__i386__)
@@ -316,7 +340,10 @@ void nr_ulsch_scale_channel(int **ul_ch_estimates_ext,
       ul_ch128 = (__m128i *)&ul_ch_estimates_ext[aarx][symbol*nb_rb*NR_NB_SC_PER_RB];
 
       if (is_dmrs_symbol==1){
+        if (pusch_dmrs_type == pusch_dmrs_type1)
           nb_rb = nb_rb>>1;
+        else
+          nb_rb = (2*nb_rb)/3;
       }
 
 
@@ -367,7 +394,7 @@ void nr_ulsch_channel_level(int **ul_ch_estimates_ext,
 
       ul_ch128=(__m128i *)&ul_ch_estimates_ext[(aatx<<1)+aarx][symbol*nb_rb*12];
 
-      for (rb = 0; rb < nb_rb; rb++) {
+      for (rb = 0; rb < len/12; rb++) {
         avg128U = _mm_add_epi32(avg128U, _mm_srai_epi32(_mm_madd_epi16(ul_ch128[0], ul_ch128[0]), x));
         avg128U = _mm_add_epi32(avg128U, _mm_srai_epi32(_mm_madd_epi16(ul_ch128[1], ul_ch128[1]), x));
         avg128U = _mm_add_epi32(avg128U, _mm_srai_epi32(_mm_madd_epi16(ul_ch128[2], ul_ch128[2]), x));
@@ -1008,7 +1035,7 @@ void nr_rx_pusch(PHY_VARS_gNB *gNB,
                                       frame_parms->ofdm_symbol_size);
 
     if (dmrs_symbol_flag == 1){
-      nb_re_pusch = rel15_ul->number_rbs * 6;
+      nb_re_pusch = rel15_ul->number_rbs * ((gNB->dmrs_UplinkConfig.pusch_dmrs_type==pusch_dmrs_type1)?6:8);
       gNB->pusch_vars[UE_id]->dmrs_symbol = symbol;
     } else {
         nb_re_pusch = rel15_ul->number_rbs * NR_NB_SC_PER_RB;
@@ -1026,7 +1053,8 @@ void nr_rx_pusch(PHY_VARS_gNB *gNB,
                                   0, // p
                                   symbol,
                                   bwp_start_subcarrier,
-                                  rel15_ul->number_rbs);
+                                  rel15_ul->number_rbs,
+                                  &gNB->dmrs_UplinkConfig);
 
     //----------------------------------------------------------
     //--------------------- RBs extraction ---------------------
@@ -1042,15 +1070,18 @@ void nr_rx_pusch(PHY_VARS_gNB *gNB,
                                 rel15_ul->start_rb,
                                 rel15_ul->number_rbs,
                                 frame_parms,
-                                dmrs_symbol_flag,
-                                gNB->pusch_vars[UE_id]->dmrs_symbol);
+                                gNB->pusch_vars[UE_id]->dmrs_symbol,
+                                rel15_ul->number_symbols,
+                                mapping_type,
+                                &gNB->dmrs_UplinkConfig);
 
     nr_ulsch_scale_channel(gNB->pusch_vars[UE_id]->ul_ch_estimates_ext,
                            frame_parms,
                            gNB->ulsch[UE_id],
                            symbol,
                            dmrs_symbol_flag,
-                           rel15_ul->number_rbs);
+                           rel15_ul->number_rbs,
+                           gNB->dmrs_UplinkConfig.pusch_dmrs_type);
 
     if (first_symbol_flag==1) {
 

openair1/PHY/NR_UE_ESTIMATION/filt16a_32.c

@@ -173,3 +173,15 @@ short filt8_dcl1_h[8]= {
 
 short filt8_dcr1_h[8]= {
 0,0,4096,8192,12288,16384,0,0};
+
+short filt8_ml2[8] = {
+13107,9830,6554,3277,0,0,0,0};
+
+short filt8_mr2[8] = {
+3277,6554,9830,13107,0,0,0,0};
+
+short filt8_rr1[8] = {
+8192,12288,16384,20480,0,0,0,0};
+
+short filt8_rr2[8] = {
+-4096,-8192,-12288,-16384,0,0,0,0};

openair1/PHY/NR_UE_ESTIMATION/filt16a_32.h

@@ -124,4 +124,13 @@ extern short filt8_dcr1[8];
 extern short filt8_dcl1_h[8];
 
 extern short filt8_dcr1_h[8];
+
+extern short filt8_ml2[8];
+
+extern short filt8_mr2[8];
+
+extern short filt8_rr1[8];
+
+extern short filt8_rr2[8];
+
 #endif
\ No newline at end of file

openair1/PHY/NR_UE_TRANSPORT/nr_ulsch_ue.c

@@ -91,13 +91,13 @@ void nr_ue_ulsch_procedures(PHY_VARS_NR_UE *UE,
                                int gNB_id) {
 
   uint32_t available_bits;
-  uint8_t mod_order, cwd_index, num_of_codewords;
+  uint8_t mod_order, cwd_index, num_of_codewords, l;
   uint32_t scrambled_output[NR_MAX_NB_CODEWORDS][NR_MAX_PDSCH_ENCODED_LENGTH>>5];
   uint32_t ***pusch_dmrs;
   int16_t **tx_layers;
   int32_t **txdataF;
   uint16_t start_sc, start_rb;
-  int8_t Wf[2], Wt[2], l0, l_prime[2], delta;
+  int8_t Wf[2], Wt[2], l_prime[2], delta;
   uint16_t n_dmrs, code_rate, number_dmrs_symbols;
   uint8_t dmrs_type;
   uint8_t mapping_type;
@@ -135,8 +135,6 @@ void nr_ue_ulsch_procedures(PHY_VARS_NR_UE *UE,
                                             mapping_type,
                                             frame_parms->ofdm_symbol_size);
 
-    printf("number_dmrs_symbols = %u\n", number_dmrs_symbols);
-
     ulsch_ue->length_dmrs = UE->dmrs_UplinkConfig.pusch_maxLength;
     ulsch_ue->rnti        = n_rnti;
     ulsch_ue->Nid_cell    = Nid_cell;
@@ -229,8 +227,6 @@ void nr_ue_ulsch_procedures(PHY_VARS_NR_UE *UE,
   n_dmrs = (harq_process_ul_ue->nb_rb*ulsch_ue->nb_re_dmrs);
   int16_t mod_dmrs[n_dmrs<<1];
   dmrs_type = UE->dmrs_UplinkConfig.pusch_dmrs_type;
-
-  l0 = get_l0_ul(mapping_type, 2);
   ///////////
   ////////////////////////////////////////////////////////////////////////
 
@@ -252,7 +248,6 @@ void nr_ue_ulsch_procedures(PHY_VARS_NR_UE *UE,
   ///////////
 
   l_prime[0] = 0; // single symbol ap 0
-  uint8_t dmrs_symbol = l0+l_prime[0], l; // Assuming dmrs-AdditionalPosition = 0
 
 #ifdef NR_SC_FDMA
   uint32_t nb_re_pusch, nb_re_dmrs_per_rb;
@@ -260,8 +255,19 @@ void nr_ue_ulsch_procedures(PHY_VARS_NR_UE *UE,
 
   for (l = start_symbol; l < start_symbol + harq_process_ul_ue->number_of_symbols; l++) {
 
-    if(l == dmrs_symbol)
-      nb_re_dmrs_per_rb = ulsch_ue->nb_re_dmrs; // [hna] ulsch_ue->nb_re_dmrs = 6 in this configuration
+    is_dmrs = is_dmrs_symbol(l,
+                             0,
+                             0,
+                             0,
+                             0,
+                             0,
+                             harq_process_ul_ue->number_of_symbols,
+                             &UE->dmrs_UplinkConfig,
+                             mapping_type,
+                             frame_parms->ofdm_symbol_size);
+
+    if (is_dmrs == 1)
+      nb_re_dmrs_per_rb = ulsch_ue->nb_re_dmrs;
     else
       nb_re_dmrs_per_rb = 0;
     
@@ -328,8 +334,6 @@ void nr_ue_ulsch_procedures(PHY_VARS_NR_UE *UE,
 
         if (is_dmrs == 1) {
 
-          printf("DMRS l = %u\n", l);
-
           nr_modulation(pusch_dmrs[l][0], n_dmrs*2, DMRS_MOD_ORDER, mod_dmrs); // currently only codeword 0 is modulated. Qm = 2 as DMRS is QPSK modulated
 
           ((int16_t*)txdataF[ap])[(sample_offsetF)<<1] = (Wt[l_prime[0]]*Wf[k_prime]*AMP*mod_dmrs[dmrs_idx<<1]) >> 15;

openair1/PHY/TOOLS/cmult_sv.c

@@ -119,6 +119,32 @@ void multadd_real_vector_complex_scalar(int16_t *x,
 
 }
 
+void multadd_real_four_symbols_vector_complex_scalar(int16_t *x,
+                                                     int16_t *alpha,
+                                                     int16_t *y)
+{
+
+  // do 8 multiplications at a time
+  simd_q15_t alpha_r_128,alpha_i_128,yr,yi,*x_128=(simd_q15_t*)x;
+  simd_q15_t y_128;
+  y_128 = _mm_loadu_si128((simd_q15_t*)y);
+
+  alpha_r_128 = set1_int16(alpha[0]);
+  alpha_i_128 = set1_int16(alpha[1]);
+
+
+  yr     = mulhi_s1_int16(alpha_r_128,x_128[0]);
+  yi     = mulhi_s1_int16(alpha_i_128,x_128[0]);
+  y_128   = _mm_adds_epi16(y_128,_mm_unpacklo_epi16(yr,yi));
+  y_128   = _mm_adds_epi16(y_128,_mm_unpackhi_epi16(yr,yi));
+
+  _mm_storeu_si128((simd_q15_t*)y, y_128);
+
+  _mm_empty();
+  _m_empty();
+
+}
+
 /*
 int rotate_cpx_vector(int16_t *x,
                       int16_t *alpha,

openair1/PHY/TOOLS/tools_defs.h

@@ -71,6 +71,10 @@ void multadd_real_vector_complex_scalar(int16_t *x,
                                         int16_t *y,
                                         uint32_t N);
 
+void multadd_real_four_symbols_vector_complex_scalar(int16_t *x,
+                                                     int16_t *alpha,
+                                                     int16_t *y);
+
 /*!\fn void multadd_complex_vector_real_scalar(int16_t *x,int16_t alpha,int16_t *y,uint8_t zero_flag,uint32_t N)
 This function performs componentwise multiplication and accumulation of a real scalar and a complex vector.
 @param x Vector input (Q1.15) in the format |Re0 Im0|Re1 Im 1| ...

openair1/SCHED_NR/phy_procedures_nr_gNB.c

@@ -22,6 +22,7 @@
 #include "PHY/phy_extern.h"
 #include "PHY/defs_gNB.h"
 #include "sched_nr.h"
+#include "PHY/NR_REFSIG/dmrs_nr.h"
 #include "PHY/NR_TRANSPORT/nr_transport.h"
 #include "PHY/NR_TRANSPORT/nr_transport_proto.h"
 #include "PHY/NR_TRANSPORT/nr_dlsch.h"

openair1/SIMULATION/NR_PHY/ulschsim.c

@@ -400,7 +400,6 @@ int main(int argc, char **argv)
   rel15_ul->mcs            = Imcs;
   rel15_ul->rv             = rvidx;
   rel15_ul->n_layers       = Nl;
-  rel15_ul->nb_re_dmrs     = nb_re_dmrs;
   rel15_ul->length_dmrs    = length_dmrs;
   rel15_ul->R              = code_rate;
   ///////////////////////////////////////////////////

openair1/SIMULATION/NR_PHY/ulsim.c

@@ -150,8 +150,8 @@ int main(int argc, char **argv)
   NR_DL_FRAME_PARMS *frame_parms;
   int loglvl = OAILOG_WARNING;
   uint64_t SSB_positions=0x01;
-  uint16_t nb_symb_sch = 12;
-  int start_symbol = NR_SYMBOLS_PER_SLOT - nb_symb_sch;
+  uint16_t nb_symb_sch = 14;
+  int start_symbol = 0;
   uint16_t nb_rb = 50;
   uint8_t Imcs = 9;
   uint8_t precod_nbr_layers = 1;
@@ -453,6 +453,7 @@ int main(int argc, char **argv)
   available_bits = nr_get_G(nb_rb, nb_symb_sch, nb_re_dmrs, length_dmrs, mod_order, 1);
   TBS            = nr_compute_tbs(mod_order, code_rate, nb_rb, nb_symb_sch, nb_re_dmrs*length_dmrs, 0, precod_nbr_layers);
 
+
   NR_gNB_ULSCH_t *ulsch_gNB = gNB->ulsch[UE_id][0];
   //nfapi_nr_ul_config_ulsch_pdu *rel15_ul = &ulsch_gNB->harq_processes[harq_pid]->ulsch_pdu;
   nfapi_nr_ul_tti_request_t     *UL_tti_req  = &gNB->UL_tti_req;
@@ -472,6 +473,32 @@ int main(int argc, char **argv)
   nr_scheduled_response_t scheduled_response;
   fapi_nr_ul_config_request_t ul_config;
 
+  unsigned int TBS;
+  uint16_t number_dmrs_symbols = 0;
+  unsigned int available_bits;
+  uint8_t nb_re_dmrs;
+  uint8_t length_dmrs = UE->dmrs_UplinkConfig.pusch_maxLength;
+  unsigned char mod_order;
+  uint16_t code_rate;
+
+  for (i = 0; i < NR_SYMBOLS_PER_SLOT; i++)
+      number_dmrs_symbols += is_dmrs_symbol(i,
+                                            0,
+                                            0,
+                                            0,
+                                            0,
+                                            0,
+                                            nb_symb_sch,
+                                            &UE->dmrs_UplinkConfig,
+                                            UE->pusch_config.pusch_TimeDomainResourceAllocation[0]->mappingType,
+                                            frame_parms->ofdm_symbol_size);
+
+  mod_order      = nr_get_Qm_ul(Imcs, 0);
+  nb_re_dmrs     = ((UE->dmrs_UplinkConfig.pusch_dmrs_type == pusch_dmrs_type1) ? 6 : 4) * number_dmrs_symbols;
+  code_rate      = nr_get_code_rate_ul(Imcs, 0);
+  available_bits = nr_get_G(nb_rb, nb_symb_sch, nb_re_dmrs, length_dmrs, mod_order, 1);
+  TBS            = nr_compute_tbs(mod_order, code_rate, nb_rb, nb_symb_sch, nb_re_dmrs*length_dmrs, 0, precod_nbr_layers);
+
   printf("\n");
 
   for (SNR = snr0; SNR < snr1; SNR += snr_step) {
@@ -493,7 +520,6 @@ int main(int argc, char **argv)
       rel15_ul->ulsch_pdu_rel15.number_rbs     = nb_rb;
       rel15_ul->ulsch_pdu_rel15.start_symbol   = start_symbol;
       rel15_ul->ulsch_pdu_rel15.number_symbols = nb_symb_sch;
-      rel15_ul->ulsch_pdu_rel15.nb_re_dmrs     = nb_re_dmrs;
       rel15_ul->ulsch_pdu_rel15.length_dmrs    = length_dmrs;
       rel15_ul->ulsch_pdu_rel15.Qm             = mod_order;
       rel15_ul->ulsch_pdu_rel15.mcs            = Imcs;

ubl

+diff --git a/cmake_targets/build_oai b/cmake_targets/build_oai
+index 227e8d8..6cd7151 100755
+--- a/cmake_targets/build_oai
++++ b/cmake_targets/build_oai
+@@ -661,7 +661,8 @@ function main() {
+   if [ "$SIMUS_PHY" = "1" ] ; then
+     echo_info "Compiling physical unitary tests simulators"
+     # TODO: fix: dlsim_tm4 pucchsim prachsim pdcchsim pbchsim mbmssim
+-    simlist="dlsim ulsim ldpctest polartest smallblocktest nr_pbchsim nr_dlschsim nr_ulschsim nr_dlsim nr_ulsim nr_pucchsim"
++    #simlist="dlsim ulsim ldpctest polartest smallblocktest nr_pbchsim nr_dlschsim nr_ulschsim nr_dlsim nr_ulsim nr_pucchsim"
++    simlist="nr_ulsim nr_dlsim"
+     for f in $simlist ; do
+       compilations \
+         phy_simulators $f \
+diff --git a/executables/nr-ru.c b/executables/nr-ru.c
+index b96fc9e..4ab9fce 100644
+--- a/executables/nr-ru.c
++++ b/executables/nr-ru.c
+@@ -2330,7 +2330,7 @@ void RCconfig_RU(void)
+       RC.ru[j]->nb_tx                             = *(RUParamList.paramarray[j][RU_NB_TX_IDX].uptr);
+       RC.ru[j]->nb_rx                             = *(RUParamList.paramarray[j][RU_NB_RX_IDX].uptr);
+       RC.ru[j]->att_tx                            = *(RUParamList.paramarray[j][RU_ATT_TX_IDX].uptr);
+-      RC.ru[j]->att_rx                            = *(RUParamList.paramarray[j][RU_ATT_RX_IDX].uptr);
++      RC.ru[j]->att_rx                            = 4;//*(RUParamList.paramarray[j][RU_ATT_RX_IDX].uptr);
+     }// j=0..num_rus
+   } else {
+     RC.nb_RU = 0;
+diff --git a/openair1/PHY/INIT/nr_init.c b/openair1/PHY/INIT/nr_init.c
+index fff1245..66d6e09 100644
+--- a/openair1/PHY/INIT/nr_init.c
++++ b/openair1/PHY/INIT/nr_init.c
+@@ -403,12 +403,47 @@ void nr_phy_config_request_sim(PHY_VARS_gNB *gNB,
+   gNB->mac_enabled   = 1;
+   fp->dl_CarrierFreq = 3500000000;//from_nrarfcn(gNB_config->nfapi_config.rf_bands.rf_band[0],gNB_config->nfapi_config.nrarfcn.value);
+   fp->ul_CarrierFreq = 3500000000;//fp->dl_CarrierFreq - (get_uldl_offset(gNB_config->nfapi_config.rf_bands.rf_band[0])*100000);
+-  fp->threequarter_fs= 0;
++  fp->threequarter_fs= 1;
+   nr_init_frame_parms(gNB_config, fp);
+   gNB->configured    = 1;
+   LOG_I(PHY,"gNB configured\n");
+ }
+ 
++void nr_phy_config_request_sim_ulsim(PHY_VARS_gNB *gNB,
++                               int N_RB_DL,
++                               int N_RB_UL,
++                               int mu,
++                               int Nid_cell,
++                               uint64_t position_in_burst,
++                               uint8_t threequarter_fs)
++{
++  NR_DL_FRAME_PARMS *fp                                   = &gNB->frame_parms;
++  nfapi_nr_config_request_t *gNB_config                   = &gNB->gNB_config;
++  //overwrite for new NR parameters
++  gNB_config->nfapi_config.rf_bands.rf_band[0]            = 78;
++  gNB_config->nfapi_config.nrarfcn.value                  = 620000;
++  gNB_config->subframe_config.numerology_index_mu.value   = mu;
++  gNB_config->subframe_config.duplex_mode.value           = TDD;
++  gNB_config->rf_config.dl_carrier_bandwidth.value        = N_RB_DL;
++  gNB_config->rf_config.ul_carrier_bandwidth.value        = N_RB_UL;
++  gNB_config->sch_config.half_frame_index.value           = 0;
++  gNB_config->sch_config.ssb_subcarrier_offset.value      = 0;
++  gNB_config->sch_config.n_ssb_crb.value                  = (N_RB_DL-20);
++  gNB_config->sch_config.ssb_subcarrier_offset.value      = 0;
++  gNB_config->sch_config.physical_cell_id.value           = Nid_cell;
++  gNB_config->sch_config.ssb_scg_position_in_burst.value  = position_in_burst;
++  gNB_config->subframe_config.dl_cyclic_prefix_type.value = (fp->Ncp == NORMAL) ? NFAPI_CP_NORMAL : NFAPI_CP_EXTENDED;
++
++  gNB->mac_enabled   = 1;
++  fp->dl_CarrierFreq = 3500000000;//from_nrarfcn(gNB_config->nfapi_config.rf_bands.rf_band[0],gNB_config->nfapi_config.nrarfcn.value);
++  fp->ul_CarrierFreq = 3500000000;//fp->dl_CarrierFreq - (get_uldl_offset(gNB_config->nfapi_config.rf_bands.rf_band[0])*100000);
++  fp->threequarter_fs= threequarter_fs;
++  nr_init_frame_parms(gNB_config, fp);
++  nr_dump_frame_parms(fp);
++  gNB->configured    = 1;
++  LOG_I(PHY,"gNB configured\n");
++}
++
+ 
+ void nr_phy_config_request(NR_PHY_Config_t *phy_config)
+ {
+diff --git a/openair1/PHY/INIT/phy_init.h b/openair1/PHY/INIT/phy_init.h
+index 7e0500b..4209413 100644
+--- a/openair1/PHY/INIT/phy_init.h
++++ b/openair1/PHY/INIT/phy_init.h
+@@ -387,6 +387,7 @@ void nr_dump_frame_parms(NR_DL_FRAME_PARMS *frame_parms);
+ int phy_init_nr_gNB(PHY_VARS_gNB *gNB, unsigned char is_secondary_gNB, unsigned char abstraction_flag);
+ void nr_phy_config_request(NR_PHY_Config_t *gNB);
+ void nr_phy_config_request_sim(PHY_VARS_gNB *gNB,int N_RB_DL,int N_RB_UL,int mu,int Nid_cell,uint64_t position_in_burst);
++void nr_phy_config_request_sim_ulsim(PHY_VARS_gNB *gNB,int N_RB_DL,int N_RB_UL,int mu,int Nid_cell,uint64_t position_in_burst, uint8_t threequarter_fs);
+ void phy_free_nr_gNB(PHY_VARS_gNB *gNB);
+ int l1_north_init_gNB(void);
+ void init_nr_transport(PHY_VARS_gNB *gNB);
+diff --git a/openair1/PHY/NR_ESTIMATION/nr_ul_channel_estimation.c b/openair1/PHY/NR_ESTIMATION/nr_ul_channel_estimation.c
+index 0656091..9e5fcb1 100644
+--- a/openair1/PHY/NR_ESTIMATION/nr_ul_channel_estimation.c
++++ b/openair1/PHY/NR_ESTIMATION/nr_ul_channel_estimation.c
+@@ -140,7 +140,7 @@ int nr_pusch_channel_estimation(PHY_VARS_gNB *gNB,
+                                          ul_ch,
+                                          8);
+       pil+=2;
+-      re_offset = (re_offset+2)&(gNB->frame_parms.ofdm_symbol_size-1);
++      re_offset = (re_offset+2)%gNB->frame_parms.ofdm_symbol_size;//(re_offset+2)&(gNB->frame_parms.ofdm_symbol_size-1);
+       rxF   = (int16_t *)&rxdataF[aarx][(symbol_offset+nushift+re_offset)];
+       //for (int i= 0; i<8; i++)
+       //printf("ul_ch addr %p %d\n", ul_ch+i, *(ul_ch+i));
+@@ -156,7 +156,7 @@ int nr_pusch_channel_estimation(PHY_VARS_gNB *gNB,
+                                          ul_ch,
+                                          8);
+       pil+=2;
+-      re_offset = (re_offset+2)&(gNB->frame_parms.ofdm_symbol_size-1);
++      re_offset = (re_offset+2)%gNB->frame_parms.ofdm_symbol_size;//(re_offset+2)&(gNB->frame_parms.ofdm_symbol_size-1);
+       rxF   = (int16_t *)&rxdataF[aarx][(symbol_offset+nushift+re_offset)];
+       //printf("ul_ch addr %p\n",ul_ch);
+       
+@@ -175,7 +175,7 @@ int nr_pusch_channel_estimation(PHY_VARS_gNB *gNB,
+       //printf("ul_ch addr %p %d\n", ul_ch+i, *(ul_ch+i));
+       
+       pil+=2;
+-      re_offset = (re_offset+2)&(gNB->frame_parms.ofdm_symbol_size-1);
++      re_offset = (re_offset+2)%gNB->frame_parms.ofdm_symbol_size;//(re_offset+2)&(gNB->frame_parms.ofdm_symbol_size-1);
+       rxF   = (int16_t *)&rxdataF[aarx][(symbol_offset+nushift+re_offset)];
+       ul_ch+=8;
+ 
+@@ -193,7 +193,7 @@ int nr_pusch_channel_estimation(PHY_VARS_gNB *gNB,
+                                            8);
+ 
+         pil+=2;
+-        re_offset = (re_offset+2)&(gNB->frame_parms.ofdm_symbol_size-1);
++        re_offset = (re_offset+2)%gNB->frame_parms.ofdm_symbol_size;//(re_offset+2)&(gNB->frame_parms.ofdm_symbol_size-1);
+         rxF   = (int16_t *)&rxdataF[aarx][(symbol_offset+nushift+re_offset)];
+       
+         ch[0] = (int16_t)(((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15);
+@@ -206,7 +206,7 @@ int nr_pusch_channel_estimation(PHY_VARS_gNB *gNB,
+                                            ul_ch,
+                                            8);
+         pil+=2;
+-        re_offset = (re_offset+2)&(gNB->frame_parms.ofdm_symbol_size-1);
++        re_offset = (re_offset+2)%gNB->frame_parms.ofdm_symbol_size;//(re_offset+2)&(gNB->frame_parms.ofdm_symbol_size-1);
+         rxF   = (int16_t *)&rxdataF[aarx][(symbol_offset+nushift+re_offset)];
+         ul_ch+=8;
+ 
+@@ -227,7 +227,7 @@ int nr_pusch_channel_estimation(PHY_VARS_gNB *gNB,
+       //printf("ul_ch addr %p %d\n", ul_ch+i, *(ul_ch+i));
+ 
+       pil+=2;
+-      re_offset = (re_offset+2)&(gNB->frame_parms.ofdm_symbol_size-1);
++      re_offset = (re_offset+2)%gNB->frame_parms.ofdm_symbol_size;//(re_offset+2)&(gNB->frame_parms.ofdm_symbol_size-1);
+       rxF   = (int16_t *)&rxdataF[aarx][(symbol_offset+nushift+re_offset)];
+              
+       ch[0] = (int16_t)(((int32_t)pil[0]*rxF[0] - (int32_t)pil[1]*rxF[1])>>15);
+@@ -242,7 +242,7 @@ int nr_pusch_channel_estimation(PHY_VARS_gNB *gNB,
+                                          8);
+                                          
+       pil+=2;
+-      re_offset = (re_offset+2)&(gNB->frame_parms.ofdm_symbol_size-1);
++      re_offset = (re_offset+2)%gNB->frame_parms.ofdm_symbol_size;//(re_offset+2)&(gNB->frame_parms.ofdm_symbol_size-1);
+       rxF   = (int16_t *)&rxdataF[aarx][(symbol_offset+nushift+re_offset)];
+       ul_ch+=8;
+       
+diff --git a/openair1/PHY/NR_TRANSPORT/nr_ulsch.c b/openair1/PHY/NR_TRANSPORT/nr_ulsch.c
+index 2bc623a..e78842d 100644
+--- a/openair1/PHY/NR_TRANSPORT/nr_ulsch.c
++++ b/openair1/PHY/NR_TRANSPORT/nr_ulsch.c
+@@ -54,5 +54,8 @@ void nr_ulsch_unscrambling(int16_t* llr,
+     }
+     if (((s>>(i&0x1f))&1)==1)
+       llr[i] = -llr[i];
++
++    //if (i<10)
++      //printf("llr[%d] = %d\n", i, llr[i]);
+   }
+ }
+diff --git a/openair1/PHY/NR_TRANSPORT/nr_ulsch_decoding.c b/openair1/PHY/NR_TRANSPORT/nr_ulsch_decoding.c
+index 19ca123..68a54b3 100644
+--- a/openair1/PHY/NR_TRANSPORT/nr_ulsch_decoding.c
++++ b/openair1/PHY/NR_TRANSPORT/nr_ulsch_decoding.c
+@@ -346,7 +346,7 @@ uint32_t nr_ulsch_decoding(PHY_VARS_gNB *phy_vars_gNB,
+ 
+   G = nr_get_G(nb_rb, number_symbols, nb_re_dmrs, length_dmrs, Qm, n_layers);
+ 
+-  LOG_D(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, mcs, n_layers, nb_symb_sch,nb_rb);
++  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, mcs, n_layers, nb_symb_sch,nb_rb);
+ 
+   if (harq_process->round == 0) {
+ 
+diff --git a/openair1/PHY/NR_TRANSPORT/nr_ulsch_demodulation.c b/openair1/PHY/NR_TRANSPORT/nr_ulsch_demodulation.c
+index e1b3c5c..0369e73 100644
+--- a/openair1/PHY/NR_TRANSPORT/nr_ulsch_demodulation.c
++++ b/openair1/PHY/NR_TRANSPORT/nr_ulsch_demodulation.c
+@@ -365,9 +365,9 @@ void nr_ulsch_channel_level(int **ul_ch_estimates_ext,
+       ul_ch128=(__m128i *)&ul_ch_estimates_ext[(aatx<<1)+aarx][symbol*nb_rb*12];
+ 
+       for (rb = 0; rb < nb_rb; rb++) {
+-        avg128U = _mm_add_epi32(avg128U, _mm_srai_epi32(_mm_madd_epi16(ul_ch128[0], ul_ch128[0]), x));
+-        avg128U = _mm_add_epi32(avg128U, _mm_srai_epi32(_mm_madd_epi16(ul_ch128[1], ul_ch128[1]), x));
+-        avg128U = _mm_add_epi32(avg128U, _mm_srai_epi32(_mm_madd_epi16(ul_ch128[2], ul_ch128[2]), x));
++        avg128U = _mm_add_epi32(avg128U, _mm_srai_epi16(_mm_madd_epi16(ul_ch128[0], ul_ch128[0]), x));
++        avg128U = _mm_add_epi32(avg128U, _mm_srai_epi16(_mm_madd_epi16(ul_ch128[1], ul_ch128[1]), x));
++        avg128U = _mm_add_epi32(avg128U, _mm_srai_epi16(_mm_madd_epi16(ul_ch128[2], ul_ch128[2]), x));
+         ul_ch128+=3;
+       }
+ 
+@@ -977,6 +977,7 @@ void nr_rx_pusch(PHY_VARS_gNB *gNB,
+   uint32_t nb_re_pusch, bwp_start_subcarrier;
+   int avgs;
+   int avg[4];
++  char filename[40];
+ 
+   pilots = 0;
+   first_symbol_flag = 0;
+@@ -1062,6 +1063,16 @@ void nr_rx_pusch(PHY_VARS_gNB *gNB,
+                                 rel15_ul->number_rbs,
+                                 gNB->pusch_vars[UE_id]->log2_maxh);
+ 
++  if (symbol == 3){
++    printf("log2_maxh = %d\n", gNB->pusch_vars[UE_id]->log2_maxh);
++    sprintf(filename,"rxdataF_gnb_ext.m");
++    LOG_M(filename,"rxdataF_gnb_v",&gNB->pusch_vars[UE_id]->rxdataF_ext[0][symbol*NR_NB_SC_PER_RB*rel15_ul->number_rbs],NR_NB_SC_PER_RB*rel15_ul->number_rbs, 1, 1);
++    sprintf(filename,"rxdataF_comp_gnb.m");
++    LOG_M(filename,"rxdataF_comp_gnb_v",&gNB->pusch_vars[UE_id]->rxdataF_comp[0][symbol*NR_NB_SC_PER_RB*rel15_ul->number_rbs],NR_NB_SC_PER_RB*rel15_ul->number_rbs, 1, 1);
++    sprintf(filename,"ul_ch_est_ext_gnb.m");
++    LOG_M(filename,"ul_ch_est_ext_gnb_v",&gNB->pusch_vars[UE_id]->ul_ch_estimates_ext[0][symbol*NR_NB_SC_PER_RB*rel15_ul->number_rbs], NR_NB_SC_PER_RB*rel15_ul->number_rbs, 1, 1);
++  }
++
+ #ifdef NR_SC_FDMA
+   nr_idft(&((uint32_t*)gNB->pusch_vars[UE_id]->rxdataF_ext[0])[symbol * rel15_ul->number_rbs * NR_NB_SC_PER_RB], nb_re_pusch);
+ #endif
+diff --git a/openair1/PHY/NR_UE_TRANSPORT/nr_dlsch_demodulation.c b/openair1/PHY/NR_UE_TRANSPORT/nr_dlsch_demodulation.c
+index 79b5c8d..c96a9a6 100644
+--- a/openair1/PHY/NR_UE_TRANSPORT/nr_dlsch_demodulation.c
++++ b/openair1/PHY/NR_UE_TRANSPORT/nr_dlsch_demodulation.c
+@@ -155,6 +155,7 @@ int nr_rx_pdsch(PHY_VARS_NR_UE *ue,
+   uint16_t n_tx=1, n_rx=1;
+   int32_t median[16];
+   uint32_t len;
++  char filename[40];
+   
+   switch (type) {
+   case SI_PDSCH:
+@@ -592,6 +593,17 @@ int nr_rx_pdsch(PHY_VARS_NR_UE *ue,
+ 
+     }
+ 
++  if (symbol == 3){
++    printf("log2_maxh = %d\n", pdsch_vars[eNB_id]->log2_maxh);
++    sprintf(filename,"rxdataF_ue_ext.m");
++    LOG_M(filename,"rxdataF_ue_ext_v",&pdsch_vars[eNB_id]->rxdataF_ext[0][symbol*NR_NB_SC_PER_RB*nb_rb],NR_NB_SC_PER_RB*nb_rb, 1, 1);
++    sprintf(filename,"rxdataF_comp_ue.m");
++    LOG_M(filename,"rxdataF_comp_ue_v",&pdsch_vars[eNB_id]->rxdataF_comp0[0][symbol*NR_NB_SC_PER_RB*nb_rb],NR_NB_SC_PER_RB*nb_rb, 1, 1);
++    sprintf(filename,"dl_ch_est_ext_ue.m");
++    LOG_M(filename,"dl_ch_est_ext_ue",&pdsch_vars[eNB_id]->dl_ch_estimates_ext[0][symbol*NR_NB_SC_PER_RB*nb_rb], NR_NB_SC_PER_RB*nb_rb, 1, 1);
++  }
++
++
+ #if UE_TIMING_TRACE
+     stop_meas(&ue->generic_stat_bis[ue->current_thread_id[nr_tti_rx]][slot]);
+ #if DISABLE_LOG_X
+@@ -636,6 +648,15 @@ int nr_rx_pdsch(PHY_VARS_NR_UE *ue,
+     dl_ch_mag_ptr = pdsch_vars[eNB_id_i]->dl_ch_mag0;
+     //i_mod should have been passed as a parameter
+   }
++
++
++  if (symbol == 3){
++    printf("log2_maxh = %d\n", pdsch_vars[eNB_id]->log2_maxh);
++    sprintf(filename,"rxdataF_comp_ue.m");
++    LOG_M(filename,"rxdataF_comp_ue_v",&pdsch_vars[eNB_id]->rxdataF_comp0[0][symbol*NR_NB_SC_PER_RB*nb_rb],NR_NB_SC_PER_RB*nb_rb, 1, 1);
++    sprintf(filename,"dl_ch_est_ext_ue.m");
++    LOG_M(filename,"dl_ch_est_ext_ue",&pdsch_vars[eNB_id]->dl_ch_estimates_ext[0][symbol*NR_NB_SC_PER_RB*nb_rb], NR_NB_SC_PER_RB*nb_rb, 1, 1);
++  }
+   
+ #if UE_TIMING_TRACE
+     stop_meas(&ue->generic_stat_bis[ue->current_thread_id[nr_tti_rx]][slot]);
+diff --git a/openair1/SCHED_NR/nr_ru_procedures.c b/openair1/SCHED_NR/nr_ru_procedures.c
+index 3ac808f..9ab539a 100644
+--- a/openair1/SCHED_NR/nr_ru_procedures.c
++++ b/openair1/SCHED_NR/nr_ru_procedures.c
+@@ -395,6 +395,7 @@ void nr_fep_full(RU_t *ru, int slot) {
+   RU_proc_t *proc = &ru->proc;
+   int l, aa;
+   NR_DL_FRAME_PARMS *fp = ru->nr_frame_parms;
++  char filename[40];
+ 
+   // if ((fp->frame_type == TDD) && 
+      // (subframe_select(fp,proc->tti_rx) != SF_UL)) return;
+@@ -405,6 +406,9 @@ void nr_fep_full(RU_t *ru, int slot) {
+   // remove_7_5_kHz(ru,proc->tti_rx<<1);
+   // remove_7_5_kHz(ru,1+(proc->tti_rx<<1));
+ 
++  //sprintf(filename,"rxdata_gnb.m");
++  //LOG_M(filename,"rxdata_gnb_v",&ru->common.rxdata[0][proc->tti_rx*fp->samples_per_slot], 2*fp->samples_per_slot, 1, 0);
++
+   for (l = 0; l < fp->symbols_per_slot; l++) {
+     for (aa = 0; aa < fp->nb_antennas_rx; aa++) {
+       nr_slot_fep_ul(fp,
+diff --git a/openair1/SCHED_NR_UE/phy_procedures_nr_ue.c b/openair1/SCHED_NR_UE/phy_procedures_nr_ue.c
+index ccf5343..bbd0c65 100644
+--- a/openair1/SCHED_NR_UE/phy_procedures_nr_ue.c
++++ b/openair1/SCHED_NR_UE/phy_procedures_nr_ue.c
+@@ -4143,6 +4143,8 @@ int phy_procedures_nrUE_RX(PHY_VARS_NR_UE *ue,
+   uint8_t ssb_periodicity = 10;// ue->ssb_periodicity; // initialized to 5ms in nr_init_ue for scenarios where UE is not configured (otherwise acquired by cell configuration from gNB or LTE)
+   uint8_t dci_cnt = 0;
+   fapi_nr_pbch_config_t *pbch_config = &ue->nrUE_config.pbch_config;
++
++  char filename[40];
+   
+   LOG_D(PHY," ****** start RX-Chain for Frame.Slot %d.%d ******  \n", frame_rx%1024, nr_tti_rx);
+ 
+@@ -4200,6 +4202,7 @@ int phy_procedures_nrUE_RX(PHY_VARS_NR_UE *ue,
+   }
+ 
+   dci_cnt = nr_ue_pdcch_procedures(eNB_id, ue, proc);
++  dci_cnt = 1;
+ 
+   if (dci_cnt > 0) {
+ 
+@@ -4215,17 +4218,32 @@ int phy_procedures_nrUE_RX(PHY_VARS_NR_UE *ue,
+ 						 16384);
+     }
+   } else {
+-    LOG_D(PHY,"[UE  %d] Frame %d, nr_tti_rx %d: No DCIs found\n",ue->Mod_id,frame_rx,nr_tti_rx);
++    LOG_I(PHY,"[UE  %d] Frame %d, nr_tti_rx %d: No DCIs found\n",ue->Mod_id,frame_rx,nr_tti_rx);
+   }
+ #endif //NR_PDCCH_SCHED
+ 
+   
+   if (dci_cnt > 0){
+-    LOG_D(PHY," ------ --> PDSCH ChannelComp/LLR Frame.slot %d.%d ------  \n", frame_rx%1024, nr_tti_rx);
++
++    ue->dlsch[ue->current_thread_id[nr_tti_rx]][eNB_id][0]->active = 1;
++    dlsch0_harq->nb_rb = 50;
++    dlsch0_harq->start_rb = 0;
++    dlsch0_harq->nb_symbols = 12;//dlsch_config_pdu->number_symbols;
++    dlsch0_harq->start_symbol = 2;//dlsch_config_pdu->start_symbol;
++    dlsch0_harq->mcs = 9;
++    dlsch0_harq->DCINdi = 1;
++    dlsch0_harq->rvidx = 0;
++    dlsch0_harq->Nl=1;
++    dlsch0_harq->status = ACTIVE;
++
++    LOG_I(PHY," ------ --> PDSCH ChannelComp/LLR Frame.slot %d.%d ------  \n", frame_rx%1024, nr_tti_rx);
+     //to update from pdsch config
+     nr_gold_pdsch(ue,nb_symb_pdcch,0, 1);
+ 
+     nb_symb_sch = dlsch0_harq->nb_symbols;
++
++    sprintf(filename,"rxdata_ue_test.m");
++    LOG_M(filename,"rxdata_ue_test_v",&ue->common_vars.rxdata[0][nr_tti_rx*ue->frame_parms.samples_per_slot],ue->frame_parms.samples_per_slot, 1, 1);
+     
+     for (uint16_t m=nb_symb_pdcch;m<=(nb_symb_sch+nb_symb_pdcch-1) ; m++){
+       nr_slot_fep(ue,
+@@ -4237,7 +4255,7 @@ int phy_procedures_nrUE_RX(PHY_VARS_NR_UE *ue,
+       
+     }
+     //set active for testing, to be removed
+-    ue->dlsch[ue->current_thread_id[nr_tti_rx]][eNB_id][0]->active = 1;
++    
+   }
+   else
+     ue->dlsch[ue->current_thread_id[nr_tti_rx]][eNB_id][0]->active = 0;
+diff --git a/openair1/SIMULATION/NR_PHY/dlsim.c b/openair1/SIMULATION/NR_PHY/dlsim.c
+index a471062..cd64e53 100644
+--- a/openair1/SIMULATION/NR_PHY/dlsim.c
++++ b/openair1/SIMULATION/NR_PHY/dlsim.c
+@@ -173,7 +173,7 @@ int main(int argc, char **argv)
+   //unsigned char frame_type = 0;
+   unsigned char pbch_phase = 0;
+ 
+-  int frame=0,slot=1;
++  int frame=0,slot=2;
+   int frame_length_complex_samples;
+   int frame_length_complex_samples_no_prefix;
+   int slot_length_complex_samples_no_prefix;
+@@ -188,7 +188,7 @@ int main(int argc, char **argv)
+   int run_initial_sync=0;
+   int do_pdcch_flag=1;
+ 
+-  int loglvl=OAILOG_WARNING;
++  int loglvl=OAILOG_INFO;
+ 
+   float target_error_rate = 0.01;
+ 
+@@ -398,6 +398,7 @@ int main(int argc, char **argv)
+   logInit();
+   set_glog(loglvl);
+   T_stdout = 1;
++  FILE *in_file;
+ 
+   if (snr1set==0)
+     snr1 = snr0+10;
+@@ -695,8 +696,13 @@ int main(int argc, char **argv)
+ 
+   nr_ue_phy_config_request(&UE_mac->phy_config);
+ 
++  int16_t *rxdata_ue;
++  rxdata_ue = &((short*) UE->common_vars.rxdata[0])[2*slot*frame_parms->samples_per_slot];
++
+   for (SNR = snr0; SNR < snr1; SNR += .2) {
+ 
++    in_file = fopen("rxdata_gnb.m", "r");
++
+     n_errors = 0;
+     //n_errors2 = 0;
+     //n_alamouti = 0;
+@@ -710,14 +716,22 @@ int main(int argc, char **argv)
+       sigma2_dB = 10 * log10((double)txlev) - SNR;
+       sigma2    = pow(10, sigma2_dB/10);
+       // printf("sigma2 %f (%f dB)\n",sigma2,sigma2_dB);
+-
++/*
+       for (i=0; i<frame_length_complex_samples; i++) {
+ 	for (aa=0; aa<frame_parms->nb_antennas_rx; aa++) {
+ 	  ((short*) UE->common_vars.rxdata[aa])[2*i]   = (short) ((r_re[aa][i] + sqrt(sigma2/2)*gaussdouble(0.0,1.0)));
+ 	  ((short*) UE->common_vars.rxdata[aa])[2*i+1] = (short) ((r_im[aa][i] + sqrt(sigma2/2)*gaussdouble(0.0,1.0)));
+ 	}
+       }
+-
++*/
++      for (i = 0; i < 2*frame_parms->samples_per_slot; i++){
++        fscanf(in_file, "%d", &rxdata_ue[i]);
++      }
++/*
++      char filename[40];
++      sprintf(filename,"rxdata_ue_test.m");
++      LOG_M(filename,"rxdata_ue_test_v",&UE->common_vars.rxdata[0][slot*frame_parms->samples_per_slot],frame_parms->samples_per_slot, 1, 1);
++*/
+       if (n_trials == 1) {
+ 
+         LOG_M("rxsig0.m","rxs0", UE->common_vars.rxdata[0], frame_length_complex_samples, 1, 1);
+diff --git a/openair1/SIMULATION/NR_PHY/ulsim.c b/openair1/SIMULATION/NR_PHY/ulsim.c
+index 00ba0bb..3e31fa0 100644
+--- a/openair1/SIMULATION/NR_PHY/ulsim.c
++++ b/openair1/SIMULATION/NR_PHY/ulsim.c
+@@ -99,7 +99,7 @@ int main(int argc, char **argv)
+   double sigma, sigma_dB;
+   double snr_step = 0.1;
+   uint8_t snr1set = 0;
+-  int slot = 0;
++  int slot = 1;
+   FILE *output_fd = NULL;
+   //uint8_t write_output_file = 0;
+   int trial, n_trials = 1, n_errors = 0, n_false_positive = 0, delay = 0;
+@@ -116,10 +116,10 @@ int main(int argc, char **argv)
+   int number_of_frames = 1;
+   int frame_length_complex_samples;
+   NR_DL_FRAME_PARMS *frame_parms;
+-  int loglvl = OAILOG_WARNING;
++  int loglvl = OAILOG_INFO;
+   uint64_t SSB_positions=0x01;
+-  uint16_t nb_symb_sch = 12;
+-  int start_symbol = NR_SYMBOLS_PER_SLOT - nb_symb_sch;
++  uint16_t nb_symb_sch = 9;
++  int start_symbol = 2;
+   uint16_t nb_rb = 50;
+   uint8_t Imcs = 9;
+   uint8_t precod_nbr_layers = 1;
+@@ -130,6 +130,7 @@ int main(int argc, char **argv)
+   int32_t txlev;
+   int start_rb = 0;
+   int UE_id =0; // [hna] only works for UE_id = 0 because NUMBER_OF_NR_UE_MAX is set to 1 (phy_init_nr_gNB causes segmentation fault)
++  uint8_t threequarter_fs = 0;
+ 
+   cpuf = get_cpu_freq_GHz();
+ 
+@@ -144,7 +145,7 @@ int main(int argc, char **argv)
+   //logInit();
+   randominit(0);
+ 
+-  while ((c = getopt(argc, argv, "d:f:g:h:i:j:l:m:n:p:r:s:y:z:F:M:N:P:R:S:")) != -1) {
++  while ((c = getopt(argc, argv, "d:f:g:h:i:j:l:m:n:pr:s:y:z:F:M:N:P:R:S:E")) != -1) {
+     switch (c) {
+ 
+       /*case 'd':
+@@ -303,6 +304,10 @@ int main(int argc, char **argv)
+         printf("Setting SNR1 to %f\n", snr1);
+         break;
+ 
++      case 'E':
++        threequarter_fs = 1;
++        break;
++
+       default:
+         case 'h':
+           printf("%s -h(elp) -p(extended_prefix) -N cell_id -f output_filename -F input_filename -g channel_model -n n_frames -t Delayspread -s snr0 -S snr1 -x transmission_mode -y TXant -z RXant -i Intefrence0 -j Interference1 -A interpolation_file -C(alibration offset dB) -N CellId\n", argv[0]);
+@@ -330,6 +335,7 @@ int main(int argc, char **argv)
+           printf("-O oversampling factor (1,2,4,8,16)\n");
+           printf("-R N_RB_DL\n");
+           printf("-S Ending SNR, runs from SNR0 to SNR1\n");
++          printf("-E enable threequarter sampling\n");
+           exit(-1);
+           break;
+     }
+@@ -338,6 +344,7 @@ int main(int argc, char **argv)
+   logInit();
+   set_glog(loglvl);
+   T_stdout = 1;
++  FILE *in_file;
+ 
+   if (snr1set == 0)
+     snr1 = snr0 + 10;
+@@ -367,7 +374,7 @@ int main(int argc, char **argv)
+ 
+   crcTableInit();
+ 
+-  nr_phy_config_request_sim(gNB, N_RB_DL, N_RB_UL, mu, Nid_cell, SSB_positions);
++  nr_phy_config_request_sim_ulsim(gNB, N_RB_DL, N_RB_UL, mu, Nid_cell, SSB_positions, threequarter_fs);
+ 
+   phy_init_nr_gNB(gNB, 0, 0);
+   //init_eNB_afterRU();
+@@ -511,20 +518,42 @@ int main(int argc, char **argv)
+       sigma_dB = 10*log10(txlev_float)-SNR;
+       sigma    = pow(10,sigma_dB/10);
+ 
++      int16_t *rxdata_gnb;
++      rxdata_gnb = &((short*) gNB->common_vars.rxdata[0])[2*slot*frame_parms->samples_per_slot];
++
+       for (trial = 0; trial < n_trials; trial++) {
+ 
+         errors_scrambling  = 0;
+         errors_decoding    = 0;
+ 
++        in_file = fopen("rxdata_ue.m", "r");
++
++        if (in_file == NULL)
++        {
++            printf("Can't open file for reading.\n");
++            return -1;
++        }
++
+         //----------------------------------------------------------
+         //------------------------ add noise -----------------------
+         //----------------------------------------------------------
++        /*
+         for (i=0; i<frame_length_complex_samples; i++) {
+           for (ap=0; ap<frame_parms->nb_antennas_rx; ap++) {
+-            ((short*) gNB->common_vars.rxdata[ap])[(2*i) + (delay*2)]   = (((int16_t *)UE->common_vars.txdata[ap])[(i<<1)])   + (int16_t)(sqrt(sigma/2)*gaussdouble(0.0,1.0)*(double)AMP); // convert to fixed point
+-            ((short*) gNB->common_vars.rxdata[ap])[2*i+1 + (delay*2)]   = (((int16_t *)UE->common_vars.txdata[ap])[(i<<1)+1]) + (int16_t)(sqrt(sigma/2)*gaussdouble(0.0,1.0)*(double)AMP);
++            ((short*) gNB->common_vars.rxdata[ap])[(2*i) + (delay*2)]   = 0.5*((((int16_t *)UE->common_vars.txdata[ap])[(i<<1)])   + (int16_t)(sqrt(sigma/2)*gaussdouble(0.0,1.0)*(double)AMP)); // convert to fixed point
++            ((short*) gNB->common_vars.rxdata[ap])[2*i+1 + (delay*2)]   = 0.5*((((int16_t *)UE->common_vars.txdata[ap])[(i<<1)+1]) + (int16_t)(sqrt(sigma/2)*gaussdouble(0.0,1.0)*(double)AMP));
+           }
+         }
++        */
++
++        for (i = 0; i < 2*frame_parms->samples_per_slot; i++){
++          fscanf(in_file, "%d", &rxdata_gnb[i]);
++        }
++
++        char filename[40];
++        sprintf(filename,"rxdata_ue_ulsim.m");
++        LOG_M(filename,"rxdata_ue_v",&gNB->common_vars.rxdata[0][slot*frame_parms->samples_per_slot], frame_parms->samples_per_slot, 1, 1);
++        
+         ////////////////////////////////////////////////////////////
+ 
+         //----------------------------------------------------------
+@@ -628,5 +657,8 @@ int main(int argc, char **argv)
+   if (input_fd)
+     fclose(input_fd);
+ 
++  if (in_file)
++    fclose(in_file);
++
+   return (n_errors);
+ }
+diff --git a/targets/PROJECTS/GENERIC-LTE-EPC/CONF/gnb.band78.tm1.106PRB.usrpx300.conf b/targets/PROJECTS/GENERIC-LTE-EPC/CONF/gnb.band78.tm1.106PRB.usrpx300.conf
+index a11bf9d..86dc080 100644
+--- a/targets/PROJECTS/GENERIC-LTE-EPC/CONF/gnb.band78.tm1.106PRB.usrpx300.conf
++++ b/targets/PROJECTS/GENERIC-LTE-EPC/CONF/gnb.band78.tm1.106PRB.usrpx300.conf
+@@ -255,7 +255,6 @@ RUs = (
+          max_rxgain                    = 114;
+          eNB_instances  = [0];
+          sdr_addrs = "type=x300";
+-
+     }
+ );  
+