channel estimation, compensation, etc ..

Added the following folder:
- ../openair1/PHY/NR_ESTIMATION/

Added the following file to CMakelists.txt:
- ../openair1/PHY/NR_ESTIMATION/nr_ul_channel_estimation.c

Added the following functions:
- nr_pusch_dmrs_rx
- nr_gold_pusch
- nr_ulsch_channel_level
- nr_ulsch_channel_compensation
- nr_ulsch_scale_channel is commented out (I think only used for downlink)

Changes from Khalid Ahmed Mahmoud Mohamed:
- nr_pusch_channel_estimation is used
- nr_ulsch_scale_channel is used
- nr_ulsch_channel_level is used
- nr_ulsch_channel_compensation is used
- multiple logging options for channel and signal magnitude

cmake_targets/CMakeLists.txt

@@ -1394,6 +1394,8 @@ set(PHY_SRC_UE
   ${OPENAIR1_DIR}/PHY/NR_TRANSPORT/nr_ulsch_llr_computation.c
   ${OPENAIR1_DIR}/PHY/NR_TRANSPORT/nr_ulsch_demodulation.c
   ${OPENAIR1_DIR}/PHY/NR_REFSIG/nr_gold.c
+  ${OPENAIR1_DIR}/PHY/NR_UE_ESTIMATION/filt16a_32.c
+  ${OPENAIR1_DIR}/PHY/NR_ESTIMATION/nr_ul_channel_estimation.c
   ${OPENAIR1_DIR}/PHY/TOOLS/file_output.c
   ${OPENAIR1_DIR}/PHY/TOOLS/cadd_vv.c
   #${OPENAIR1_DIR}/PHY/TOOLS/lte_dfts.c
@@ -1438,6 +1440,7 @@ set(PHY_SRC_UE
   ${OPENAIR1_DIR}/PHY/NR_REFSIG/ul_ref_seq_nr.c
   ${OPENAIR1_DIR}/PHY/NR_REFSIG/nr_dmrs_rx.c
   ${OPENAIR1_DIR}/PHY/NR_REFSIG/nr_gold_ue.c
+  ${OPENAIR1_DIR}/PHY/NR_UE_ESTIMATION/filt16a_32.c
   ${OPENAIR1_DIR}/PHY/NR_UE_ESTIMATION/nr_dl_channel_estimation.c
   ${OPENAIR1_DIR}/PHY/NR_UE_ESTIMATION/nr_adjust_synch_ue.c
   ${OPENAIR1_DIR}/PHY/NR_UE_ESTIMATION/nr_ue_measurements.c

openair1/PHY/INIT/nr_init.c

@@ -208,24 +208,32 @@ int phy_init_nr_gNB(PHY_VARS_gNB *gNB,
   for (int UE_id=0; UE_id<NUMBER_OF_UE_MAX; UE_id++) {
     //FIXME
     pusch_vars[UE_id] = (NR_gNB_PUSCH *)malloc16_clear( sizeof(NR_gNB_PUSCH) );
-    pusch_vars[UE_id]->rxdataF_ext           = (int32_t **)malloc16( 2*sizeof(int32_t *) );
-    pusch_vars[UE_id]->rxdataF_ext2          = (int32_t **)malloc16( 2*sizeof(int32_t *) );
-    pusch_vars[UE_id]->drs_ch_estimates      = (int32_t **)malloc16( 2*sizeof(int32_t *) );
-    pusch_vars[UE_id]->drs_ch_estimates_time = (int32_t **)malloc16( 2*sizeof(int32_t *) );
-    pusch_vars[UE_id]->rxdataF_comp          = (int32_t **)malloc16( 2*sizeof(int32_t *) );
-    pusch_vars[UE_id]->ul_ch_mag             = (int32_t **)malloc16( 2*sizeof(int32_t *) );
-    pusch_vars[UE_id]->ul_ch_magb            = (int32_t **)malloc16( 2*sizeof(int32_t *) );
-
-    for (i=0; i<2; i++) {
+    pusch_vars[UE_id]->rxdataF_ext           = (int32_t **)malloc16( fp->nb_antennas_rx*sizeof(int32_t *) );
+    pusch_vars[UE_id]->rxdataF_ext2          = (int32_t **)malloc16( fp->nb_antennas_rx*sizeof(int32_t *) );
+    pusch_vars[UE_id]->ul_ch_estimates       = (int32_t **)malloc16( fp->nb_antennas_rx*sizeof(int32_t *) );
+    pusch_vars[UE_id]->ul_ch_estimates_ext   = (int32_t **)malloc16( fp->nb_antennas_rx*sizeof(int32_t *) );
+    pusch_vars[UE_id]->ul_ch_estimates_time  = (int32_t **)malloc16( fp->nb_antennas_rx*sizeof(int32_t *) );
+    pusch_vars[UE_id]->rxdataF_comp          = (int32_t **)malloc16( fp->nb_antennas_rx*sizeof(int32_t *) );
+    pusch_vars[UE_id]->ul_ch_mag0             = (int32_t **)malloc16( fp->nb_antennas_rx*sizeof(int32_t *) );
+    pusch_vars[UE_id]->ul_ch_magb0            = (int32_t **)malloc16( fp->nb_antennas_rx*sizeof(int32_t *) );
+    pusch_vars[UE_id]->ul_ch_mag             = (int32_t **)malloc16( fp->nb_antennas_rx*sizeof(int32_t *) );
+    pusch_vars[UE_id]->ul_ch_magb            = (int32_t **)malloc16( fp->nb_antennas_rx*sizeof(int32_t *) );
+    pusch_vars[UE_id]->rho                   = (int32_t **)malloc16_clear( fp->nb_antennas_rx*sizeof(int32_t*) );
+
+    for (i=0; i<fp->nb_antennas_rx; i++) {
       // RK 2 times because of output format of FFT!
       // FIXME We should get rid of this
       pusch_vars[UE_id]->rxdataF_ext[i]           = (int32_t *)malloc16_clear( sizeof(int32_t)*cfg->rf_config.ul_carrier_bandwidth.value*12*fp->symbols_per_slot );
       pusch_vars[UE_id]->rxdataF_ext2[i]          = (int32_t *)malloc16_clear( sizeof(int32_t)*cfg->rf_config.ul_carrier_bandwidth.value*12*fp->symbols_per_slot );
-      pusch_vars[UE_id]->drs_ch_estimates[i]      = (int32_t *)malloc16_clear( sizeof(int32_t)*cfg->rf_config.ul_carrier_bandwidth.value*12*fp->symbols_per_slot );
-      pusch_vars[UE_id]->drs_ch_estimates_time[i] = (int32_t *)malloc16_clear( 2*sizeof(int32_t)*fp->ofdm_symbol_size );
+      pusch_vars[UE_id]->ul_ch_estimates[i]       = (int32_t *)malloc16_clear( sizeof(int32_t)*cfg->rf_config.ul_carrier_bandwidth.value*12*fp->symbols_per_slot );
+      pusch_vars[UE_id]->ul_ch_estimates_ext[i]   = (int32_t *)malloc16_clear( sizeof(int32_t)*cfg->rf_config.ul_carrier_bandwidth.value*12*fp->symbols_per_slot );
+      pusch_vars[UE_id]->ul_ch_estimates_time[i]  = (int32_t *)malloc16_clear( 2*sizeof(int32_t)*fp->ofdm_symbol_size );
       pusch_vars[UE_id]->rxdataF_comp[i]          = (int32_t *)malloc16_clear( sizeof(int32_t)*cfg->rf_config.ul_carrier_bandwidth.value*12*fp->symbols_per_slot );
+      pusch_vars[UE_id]->ul_ch_mag0[i]             = (int32_t *)malloc16_clear( fp->symbols_per_slot*sizeof(int32_t)*cfg->rf_config.ul_carrier_bandwidth.value*12 );
+      pusch_vars[UE_id]->ul_ch_magb0[i]            = (int32_t *)malloc16_clear( fp->symbols_per_slot*sizeof(int32_t)*cfg->rf_config.ul_carrier_bandwidth.value*12 );
       pusch_vars[UE_id]->ul_ch_mag[i]             = (int32_t *)malloc16_clear( fp->symbols_per_slot*sizeof(int32_t)*cfg->rf_config.ul_carrier_bandwidth.value*12 );
       pusch_vars[UE_id]->ul_ch_magb[i]            = (int32_t *)malloc16_clear( fp->symbols_per_slot*sizeof(int32_t)*cfg->rf_config.ul_carrier_bandwidth.value*12 );
+      pusch_vars[UE_id]->rho[i]                   = (int32_t *)malloc16_clear( sizeof(int32_t)*(fp->N_RB_UL*12*7*2) );
     }
 
     pusch_vars[UE_id]->llr = (int16_t *)malloc16_clear( (8*((3*8*6144)+12))*sizeof(int16_t) ); // [hna] 6144 is LTE and (8*((3*8*6144)+12)) is not clear 

openair1/PHY/NR_ESTIMATION/nr_ul_estimation.h

+/*
+ * Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The OpenAirInterface Software Alliance licenses this file to You under
+ * the OAI Public License, Version 1.1  (the "License"); you may not use this file
+ * except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.openairinterface.org/?page_id=698
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *-------------------------------------------------------------------------------
+ * For more information about the OpenAirInterface (OAI) Software Alliance:
+ *      contact@openairinterface.org
+ */
+
+#ifndef __NR_UL_ESTIMATION_DEFS__H__
+#define __NR_UL_ESTIMATION_DEFS__H__
+
+
+#include "PHY/defs_gNB.h"
+/** @addtogroup _PHY_PARAMETER_ESTIMATION_BLOCKS_
+ * @{
+ */
+
+
+/*!
+\brief This function performs channel estimation including frequency interpolation
+\param gNB Pointer to gNB PHY variables
+\param Ns slot number (0..19)
+\param p
+\param symbol symbol within slot
+\param bwp_start_subcarrier, first allocated subcarrier
+\param nb_rb_pusch, number of allocated RBs for this UE
+*/
+
+ int32_t nr_pusch_channel_estimation(PHY_VARS_gNB *gNB,
+                                     uint8_t gNB_offset,
+				                     unsigned char Ns,
+				                     unsigned short p,
+				                     unsigned char symbol,
+				                     unsigned short bwp_start_subcarrier,
+				                     unsigned short nb_rb_pusch);
+
+
+#endif

openair1/PHY/NR_REFSIG/nr_dmrs_rx.c

@@ -36,6 +36,8 @@
 
 #include "refsig_defs_ue.h"
 #include "PHY/defs_nr_UE.h"
+#include "nr_refsig.h"
+#include "PHY/defs_gNB.h"
 
 /*Table 7.4.1.1.2-1/2 from 38.211 */
 int wf1[8][2] = {{1,1},{1,-1},{1,1},{1,-1},{1,1},{1,-1},{1,1},{1,1}};
@@ -48,6 +50,59 @@ short nr_rx_mod_table[14]  = {0,0,23170,-23170,-23170,23170,23170,-23170,23170,2
 short nr_rx_nmod_table[14] = {0,0,-23170,23170,23170,-23170,-23170,23170,-23170,-23170,23170,23170,23170,-23170};
 
 
+int nr_pusch_dmrs_rx(PHY_VARS_gNB *gNB,
+                     unsigned int Ns,
+                     unsigned int *nr_gold_pusch,
+                     int32_t *output,
+                     unsigned short p,
+                     unsigned char lp,
+                     unsigned short nb_pusch_rb)
+{
+  int8_t w,config_type;
+  short *mod_table;
+  unsigned char idx=0;
+
+  typedef int array_of_w[2];
+  array_of_w *wf;
+  array_of_w *wt;
+
+  config_type = 0; //to be updated by higher layer
+
+  wf = (config_type==0) ? wf1 : wf2;
+  wt = (config_type==0) ? wt1 : wt2;
+
+  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 (gNB->frame_parms.Ncp == NORMAL) {
+
+        for (int i=0; i<nb_pusch_rb*((config_type==0) ? 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;
+
+          idx = ((((nr_gold_pusch[(i<<1)>>5])>>((i<<1)&0x1f))&1)<<1) ^ (((nr_gold_pusch[((i<<1)+1)>>5])>>(((i<<1)+1)&0x1f))&1);
+        ((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("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]);
+#endif
+        }
+      } else {
+        LOG_E(PHY,"extended cp not supported for PUSCH DMRS yet\n");
+      }
+  } else {
+    LOG_E(PHY,"Illegal p %d PUSCH DMRS port\n",p);
+  }
+
+  return(0);
+}
+
+
 
 int nr_pdsch_dmrs_rx(PHY_VARS_NR_UE *ue,
 						unsigned int Ns,

openair1/PHY/NR_REFSIG/nr_gold.c

@@ -101,3 +101,59 @@ void nr_init_pdsch_dmrs(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)
+{
+
+  unsigned char ns,l;
+  unsigned int n,x1,x2,x2tmp0;
+  int nscid;
+  unsigned int nid;
+
+  /// to be updated from higher layer
+  //unsigned short lbar = 0;
+
+  for (nscid=0; nscid<2; nscid++) {
+    if (n_idDMRS)
+      nid = n_idDMRS[nscid];
+    else
+      nid = gNB->frame_parms.Nid_cell;
+      
+      //printf("gold pdsch nid %d lbar %d\n",nid,lbar);
+
+    for (ns=0; ns<20; ns++) {
+
+      for (l=0; l<length_dmrs; l++) {
+
+      x2tmp0 = ((14*ns+(lbar+l)+1)*((nid<<1)+1))<<17;
+        x2 = (x2tmp0+(nid<<1)+nscid)%(1<<31);  //cinit
+        
+                //printf("ns %d gold pdsch x2 %d\n",ns,x2);
+
+        x1 = 1+ (1<<31);
+        x2=x2 ^ ((x2 ^ (x2>>1) ^ (x2>>2) ^ (x2>>3))<<31);
+
+        // skip first 50 double words (1600 bits)
+        for (n=1; n<50; n++) {
+          x1 = (x1>>1) ^ (x1>>4);
+          x1 = x1 ^ (x1<<31) ^ (x1<<28);
+          x2 = (x2>>1) ^ (x2>>2) ^ (x2>>3) ^ (x2>>4);
+          x2 = x2 ^ (x2<<31) ^ (x2<<30) ^ (x2<<29) ^ (x2<<28);
+            //printf("x1 : %x, x2 : %x\n",x1,x2);
+        }
+
+        for (n=0; n<52; n++) {
+          x1 = (x1>>1) ^ (x1>>4);
+          x1 = x1 ^ (x1<<31) ^ (x1<<28);
+          x2 = (x2>>1) ^ (x2>>2) ^ (x2>>3) ^ (x2>>4);
+          x2 = x2 ^ (x2<<31) ^ (x2<<30) ^ (x2<<29) ^ (x2<<28);
+          gNB->nr_gold_pusch[nscid][ns][l][n] = x1^x2;
+            // if ((ns==2)&&(l==0))
+            //printf("n=%d : c %x\n",n,x1^x2);
+        }
+
+      }
+    }
+  }
+}
\ No newline at end of file

openair1/PHY/NR_REFSIG/nr_refsig.h

@@ -39,4 +39,13 @@ 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_gold_pusch(PHY_VARS_gNB* gNB, unsigned short lbar,unsigned short *n_idDMRS, unsigned short length_dmrs);
+
+int nr_pusch_dmrs_rx(PHY_VARS_gNB *gNB,
+                     unsigned int Ns,
+                     unsigned int *nr_gold_pusch,
+                     int32_t *output,
+                     unsigned short p,
+                     unsigned char lp,
+                     unsigned short nb_pusch_rb);
 #endif

openair1/PHY/NR_TRANSPORT/nr_transport_proto.h

@@ -65,7 +65,9 @@ void nr_rx_pusch(PHY_VARS_gNB *gNB,
 
 */
 void nr_ulsch_extract_rbs_single(int **rxdataF,
+                                 int **ul_ch_estimates,
                                  int **rxdataF_ext,
+                                 int **ul_ch_estimates_ext,
                                  uint32_t rxdataF_ext_offset,
                                  // unsigned int *rb_alloc, [hna] Resource Allocation Type 1 is assumed only for the moment
                                  unsigned char symbol,
@@ -73,6 +75,54 @@ void nr_ulsch_extract_rbs_single(int **rxdataF,
                                  unsigned short nb_rb_pusch,
                                  NR_DL_FRAME_PARMS *frame_parms);
 
+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);
+
+
+/** \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
+    @param ul_ch_estimates_ext Channel estimates in allocated RBs
+    @param frame_parms Pointer to frame descriptor
+    @param avg Pointer to average signal strength
+    @param pilots_flag Flag to indicate pilots in symbol
+    @param nb_rb Number of allocated RBs
+*/
+void nr_ulsch_channel_level(int **ul_ch_estimates_ext,
+                            NR_DL_FRAME_PARMS *frame_parms,
+                            int32_t *avg,
+                            uint8_t symbol,
+                            uint32_t len,
+                            unsigned short nb_rb);
+
+
+/** \brief This function performs channel compensation (matched filtering) on the received RBs for this allocation.  In addition, it computes the squared-magnitude of the channel with weightings for 16QAM/64QAM detection as well as dual-stream detection (cross-correlation)
+    @param rxdataF_ext Frequency-domain received signal in RBs to be demodulated
+    @param ul_ch_estimates_ext Frequency-domain channel estimates in RBs to be demodulated
+    @param ul_ch_mag First Channel magnitudes (16QAM/64QAM)
+    @param ul_ch_magb Second weighted Channel magnitudes (64QAM)
+    @param rxdataF_comp Compensated received waveform
+    @param frame_parms Pointer to frame descriptor
+    @param symbol Symbol on which to operate
+    @param Qm Modulation order of allocation
+    @param nb_rb Number of RBs in allocation
+    @param output_shift Rescaling for compensated output (should be energy-normalizing)
+*/
+void nr_ulsch_channel_compensation(int **rxdataF_ext,
+                                int **ul_ch_estimates_ext,
+                                int **ul_ch_mag,
+                                int **ul_ch_magb,
+                                int **rxdataF_comp,
+                                int **rho,
+                                NR_DL_FRAME_PARMS *frame_parms,
+                                unsigned char symbol,
+                                uint8_t pilots,
+                                unsigned char mod_order,
+                                unsigned short nb_rb,
+                                unsigned char output_shift);
+
 /*!
 \brief This function implements the idft transform precoding in PUSCH
 \param z Pointer to input in frequnecy domain, and it is also the output in time domain
@@ -102,6 +152,7 @@ void nr_ulsch_qpsk_llr(int32_t *rxdataF_comp,
 void nr_ulsch_16qam_llr(int32_t *rxdataF_comp,
                         int32_t **ul_ch_mag,
                         int16_t  *ulsch_llr,
+                        uint32_t nb_rb,
                         uint32_t nb_re,
                         uint8_t  symbol);
 
@@ -118,6 +169,7 @@ void nr_ulsch_64qam_llr(int32_t *rxdataF_comp,
                         int32_t **ul_ch_mag,
                         int32_t **ul_ch_magb,
                         int16_t  *ulsch_llr,
+                        uint32_t nb_rb,
                         uint32_t nb_re,
                         uint8_t  symbol);
 
@@ -135,6 +187,7 @@ void nr_ulsch_compute_llr(int32_t *rxdataF_comp,
                           int32_t **ul_ch_mag,
                           int32_t **ul_ch_magb,
                           int16_t  *ulsch_llr,
+                          uint32_t nb_rb,
                           uint32_t nb_re,
                           uint8_t  symbol,
                           uint8_t  mod_order);
\ No newline at end of file

openair1/PHY/NR_TRANSPORT/nr_ulsch_llr_computation.c

@@ -30,7 +30,6 @@
  * \warning
  */
 
-
 #include "PHY/defs_nr_common.h"
 #include "PHY/sse_intrin.h"
 #include "PHY/impl_defs_top.h"
@@ -71,23 +70,20 @@ void nr_ulsch_qpsk_llr(int32_t *rxdataF_comp,
 void nr_ulsch_16qam_llr(int32_t *rxdataF_comp,
                         int32_t **ul_ch_mag,
                         int16_t  *ulsch_llr,
+                        uint32_t nb_rb,
                         uint32_t nb_re,
                         uint8_t  symbol)
 {
+
 #if defined(__x86_64__) || defined(__i386__)
   __m128i *rxF = (__m128i*)rxdataF_comp;
-  // __m128i *ch_mag; // [hna] This should be uncommented once channel estimation is implemented
+  __m128i *ch_mag;
   __m128i llr128[2];
   uint32_t *llr32;
 
-  // [hna] temp_channel and one_over_sqrt_2 are for temporary use until channel estimation is implemented
-  //       else ul_ch_mag and ul_ch_magb should be used after channel estimation has benn implemented
-  __m128i temp_channel;
-  int16_t one_over_sqrt_2 = 23170;
-  
 #elif defined(__arm__)
   int16x8_t *rxF = (int16x8_t*)&rxdataF_comp;
-  // int16x8_t *ch_mag; // [hna] This should be uncommented once channel estimation is implemented
+  int16x8_t *ch_mag;
   int16x8_t xmm0;
   int16_t *llr16;
 #endif
@@ -103,21 +99,16 @@ void nr_ulsch_16qam_llr(int32_t *rxdataF_comp,
     llr16 = (int16_t*)ulsch_llr;
 #endif
 
-// [hna] This should be uncommented once channel estimation is implemented
-// ------------------------------------------------------------
-// #if defined(__x86_64__) || defined(__i386__)
-//   ch_mag = (__m128i*)&ul_ch_mag[0][(symbol*nb_rb*12)];
-// #elif defined(__arm__)
-//   ch_mag = (int16x8_t*)&ul_ch_mag[0][(symbol*nb_rb*12)];
-// #endif
-// ------------------------------------------------------------
+#if defined(__x86_64__) || defined(__i386__)
+  ch_mag = (__m128i*)&ul_ch_mag[0][(symbol*nb_rb*12)];
+#elif defined(__arm__)
+  ch_mag = (int16x8_t*)&ul_ch_mag[0][(symbol*nb_rb*12)];
+#endif
 
   len_mod4 = nb_re&3;
   nb_re >>= 2;  // length in quad words (4 REs)
   nb_re += (len_mod4 == 0 ? 0 : 1);
 
-  temp_channel = _mm_set1_epi16((QAM16_n1 * one_over_sqrt_2)>>(2*15-AMP_SHIFT));
-
   for (i=0; i<nb_re; i++) {
 
 #if defined(__x86_64__) || defined(__i386)
@@ -125,7 +116,7 @@ void nr_ulsch_16qam_llr(int32_t *rxdataF_comp,
     xmm0 = _mm_abs_epi16(rxF[i]); // registers of even index in xmm0-> |y_R|, registers of odd index in xmm0-> |y_I|
     
     
-    xmm0 = _mm_subs_epi16(temp_channel,xmm0); // registers of even index in xmm0-> |y_R|-|h|^2, registers of odd index in xmm0-> |y_I|-|h|^2
+    xmm0 = _mm_subs_epi16(ch_mag[i],xmm0); // registers of even index in xmm0-> |y_R|-|h|^2, registers of odd index in xmm0-> |y_I|-|h|^2
 
     llr128[0] = _mm_unpacklo_epi32(rxF[i],xmm0); // llr128[0] contains the llrs of the 1st and 2nd REs
     llr128[1] = _mm_unpackhi_epi32(rxF[i],xmm0); // llr128[1] contains the llrs of the 3rd and 4th REs
@@ -186,52 +177,43 @@ void nr_ulsch_64qam_llr(int32_t *rxdataF_comp,
                         int32_t **ul_ch_mag,
                         int32_t **ul_ch_magb,
                         int16_t  *ulsch_llr,
+                        uint32_t nb_rb,
                         uint32_t nb_re,
                         uint8_t  symbol)
 {
+
 #if defined(__x86_64__) || defined(__i386__)
   __m128i *rxF = (__m128i*)rxdataF_comp;
-  // __m128i *ch_mag,*ch_magb; // [hna] This should be uncommented once channel estimation is implemented
-
-  // [hna] temp_channel and one_over_sqrt_2 are for temporary use until channel estimation is implemented
-  //       else ul_ch_mag and ul_ch_magb should be used after channel estimation has been implemented
-  __m128i temp_channel[2];
-  int16_t one_over_sqrt_2 = 23170;
-
+  __m128i *ch_mag,*ch_magb;
 #elif defined(__arm__)
   int16x8_t *rxF = (int16x8_t*)&rxdataF_comp;
-  // int16x8_t *ch_mag,*ch_magb; // [hna] This should be uncommented once channel estimation is implemented
+  int16x8_t *ch_mag,*ch_magb; // [hna] This should be uncommented once channel estimation is implemented
   int16x8_t xmm1,xmm2;
 #endif
 
   int i;
   unsigned char len_mod4;
 
-// [hna] This should be uncommented once channel estimation is implemented
-// -------------------------------------------------------------------------
-// #if defined(__x86_64__) || defined(__i386__)
-//   ch_mag = (__m128i*)&ul_ch_mag[0][(symbol*frame_parms->N_RB_UL*12)];
-//   ch_magb = (__m128i*)&ul_ch_magb[0][(symbol*frame_parms->N_RB_UL*12)];
-// #elif defined(__arm__)
-//   ch_mag = (int16x8_t*)&ul_ch_mag[0][(symbol*frame_parms->N_RB_UL*12)];
-//   ch_magb = (int16x8_t*)&ul_ch_magb[0][(symbol*frame_parms->N_RB_UL*12)];
-// #endif
-// -------------------------------------------------------------------------
+#if defined(__x86_64__) || defined(__i386__)
+  ch_mag = (__m128i*)&ul_ch_mag[0][(symbol*nb_rb*12)];
+  ch_magb = (__m128i*)&ul_ch_magb[0][(symbol*nb_rb*12)];
+#elif defined(__arm__)
+  ch_mag = (int16x8_t*)&ul_ch_mag[0][(symbol*nb_rb*12)];
+  ch_magb = (int16x8_t*)&ul_ch_magb[0][(symbol*nb_rb*12)];
+#endif
 
   len_mod4 = nb_re&3;
   nb_re    = nb_re>>2;  // length in quad words (4 REs)
   nb_re   += ((len_mod4 == 0) ? 0 : 1);
 
-  temp_channel[0] = _mm_set1_epi16((QAM64_n1 * one_over_sqrt_2)>>(2*15-AMP_SHIFT));
-  temp_channel[1] = _mm_set1_epi16((QAM64_n2 * one_over_sqrt_2)>>(2*15-AMP_SHIFT));
 
   for (i=0; i<nb_re; i++) {
 
 #if defined(__x86_64__) || defined(__i386__)
     xmm1 = _mm_abs_epi16(rxF[i]);
-    xmm1 = _mm_subs_epi16(temp_channel[0],xmm1);
+    xmm1 = _mm_subs_epi16(ch_mag[i],xmm1);
     xmm2 = _mm_abs_epi16(xmm1);
-    xmm2 = _mm_subs_epi16(temp_channel[1],xmm2);
+    xmm2 = _mm_subs_epi16(ch_magb[i],xmm2);
 #elif defined(__arm__)
     xmm1 = vabsq_s16(rxF[i]);
     xmm1 = vsubq_s16(ch_mag[i],xmm1);
@@ -331,6 +313,7 @@ void nr_ulsch_compute_llr(int32_t *rxdataF_comp,
                           int32_t **ul_ch_mag,
                           int32_t **ul_ch_magb,
                           int16_t *ulsch_llr,
+                          uint32_t nb_rb,
                           uint32_t nb_re,
                           uint8_t  symbol,
                           uint8_t  mod_order)
@@ -346,6 +329,7 @@ void nr_ulsch_compute_llr(int32_t *rxdataF_comp,
       nr_ulsch_16qam_llr(rxdataF_comp,
                          ul_ch_mag,
                          ulsch_llr,
+                         nb_rb,
                          nb_re,
                          symbol);
       break;
@@ -354,6 +338,7 @@ void nr_ulsch_compute_llr(int32_t *rxdataF_comp,
                        ul_ch_mag,
                        ul_ch_magb,
                        ulsch_llr,
+                       nb_rb,
                        nb_re,
                        symbol);
       break;

openair1/PHY/NR_UE_ESTIMATION/filt16a_32.c

+/*
+ * Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The OpenAirInterface Software Alliance licenses this file to You under
+ * the OAI Public License, Version 1.1  (the "License"); you may not use this file
+ * except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.openairinterface.org/?page_id=698
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *-------------------------------------------------------------------------------
+ * For more information about the OpenAirInterface (OAI) Software Alliance:
+ *      contact@openairinterface.org
+ */
+#include "filt16a_32.h"
+
+short filt16a_l0[16] = {
+16384,12288,8192,4096,0,0,0,0,0,0,0,0,0,0,0,0};
+
+short filt16a_r0[16] = {
+0,0,0,0,0,4096,8192,12288,16384,20480,24576,28672,0,0,0,0};
+
+short filt16a_m0[16] = {
+0,4096,8192,12288,16384,12288,8192,4096,0,-4096,-8192,-12288,0,0,0,0};
+
+short filt16a_l1[16] = {
+20480,16384,12288,8192,4096,0,0,0,0,0,0,0,0,0,0,0};
+
+short filt16a_r1[16] = {
+0,0,0,0,0,0,4096,8192,12288,16384,20480,24576,0,0,0,0};
+
+short filt16a_m1[16] = {
+-4096,0,4096,8192,12288,16384,12288,8192,4096,0,-4096,-8192,0,0,0,0};
+
+short filt16a_l2[16] = {
+24576,20480,16384,12288,8192,4096,0,0,0,0,0,0,0,0,0,0};
+
+short filt16a_r2[16] = {
+0,0,0,0,0,0,0,4096,8192,12288,16384,20480,0,0,0,0};
+
+short filt16a_m2[16] = {
+-8192,-4096,0,4096,8192,12288,16384,12288,8192,4096,0,-4096,0,0,0,0};
+
+short filt16a_l3[16] = {
+28672,24576,20480,16384,12288,8192,4096,0,0,0,0,0,0,0,0,0};
+
+short filt16a_r3[16] = {
+0,0,0,0,0,0,0,0,4096,8192,12288,16384,0,0,0,0};
+
+short filt16a_m3[16] = {
+-12288,-8192,-4096,0,4096,8192,12288,16384,12288,8192,4096,0,0,0,0,0};
+
+short filt16a_l0_dc[16] = {
+16384,12288,8192,4096,0,0,0,0,0,0,0,0,0,0,0,0};
+
+short filt16a_r0_dc[16] = {
+0,0,0,0,0,3276,9830,13107,16384,19660,22937,26214,0,0,0,0};
+
+short filt16a_m0_dc[16] = {
+0,4096,8192,12288,16384,13107,6553,3276,0,-3277,-6554,-9831,0,0,0,0};
+
+short filt16a_l1_dc[16] = {
+16384,12288,8192,4096,0,-4096,0,0,0,0,0,0,0,0,0,0};
+
+short filt16a_r1_dc[16] = {
+0,0,0,0,0,0,6553,9830,13107,16384,19660,22937,0,0,0,0};
+
+short filt16a_m1_dc[16] = {
+-4096,0,4096,8192,12288,16384,9830,6553,3276,0,-3277,-6554,0,0,0,0};
+
+short filt16a_l2_dc[16] = {
+26214,22937,19660,16384,13107,9830,6553,0,0,0,0,0,0,0,0,0};
+
+short filt16a_r2_dc[16] = {
+0,0,0,0,0,0,0,4096,8192,12288,16384,20480,0,0,0,0};
+
+short filt16a_m2_dc[16] = {
+-6554,-3277,0,3276,6553,6553,16384,12288,8192,4096,0,-4096,0,0,0,0};
+
+short filt16a_l3_dc[16] = {
+26214,22937,19660,16384,13107,9830,3276,0,0,0,0,0,0,0,0,0};
+
+short filt16a_r3_dc[16] = {
+0,0,0,0,0,0,0,0,4096,8192,12288,16384,0,0,0,0};
+
+short filt16a_m3_dc[16] = {
+-9831,-6554,-3277,0,3276,6553,9830,16384,12288,8192,4096,0,0,0,0,0};
+
+short filt16a_1[16] = {
+16384,16384,16384,16384,16384,16384,16384,16384,16384,16384,16384,16384};
+
+short filt16a_2l0[16] = {
+16384,12288,8192,4096,-4096,0,0,0,0,0,0,0,0,0,0,0};
+
+short filt16a_2r0[16] = {
+0,4096,8192,12288,16384,20480,0,0,0,0,0,0,0,0,0,0};
+
+short filt16a_2l1[16] = {
+20480,16384,12288,8192,4096,0,0,0,0,0,0,0,0,0,0,0};
+
+short filt16a_2r1[16] = {
+-4096,0,4096,8192,12288,16384,0,0,0,0,0,0,0,0,0,0};
+
+/*filter8*/
+short filt8_l0[8] = {
+16384,8192,0,0,0,0,0,0};
+
+short filt8_mr0[8] = {
+0,0,0,8192,16384,8192,0,-8192};
+
+short filt8_r0[8] = {
+0,8192,16384,24576,0,0,0,0};
+
+short filt8_m0[8] = {
+0,8192,16384,8192,0,0,0,0};
+
+short filt8_mm0[8]= {
+0,0,0,8192,16384,8192,0,0};
+
+short filt8_l1[8] = {
+24576,16384,0,0,0,0,0,0};
+
+short filt8_ml1[8] = {
+-8192,0,8192,16384,8192,0,0,0};
+
+short filt8_r1[8] = {
+0,0,8192,16384,0,0,0,0};
+
+short filt8_m1[8] = {
+0,0,8192,16384,8192,0,0,0};
+
+short filt8_mm1[8]= {
+0,0,0,0,8192,16384,8192,0};
\ No newline at end of file

openair1/PHY/NR_UE_ESTIMATION/filt16a_32.h

-short filt16a_l0[16] = {
-16384,12288,8192,4096,0,0,0,0,0,0,0,0,0,0,0,0};
+/*
+ * Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The OpenAirInterface Software Alliance licenses this file to You under
+ * the OAI Public License, Version 1.1  (the "License"); you may not use this file
+ * except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.openairinterface.org/?page_id=698
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *-------------------------------------------------------------------------------
+ * For more information about the OpenAirInterface (OAI) Software Alliance:
+ *      contact@openairinterface.org
+ */
 
-short filt16a_r0[16] = {
-0,0,0,0,0,4096,8192,12288,16384,20480,24576,28672,0,0,0,0};
+#ifndef __FILT16A_32__H__
+#define __FILT16A_32__H__
 
-short filt16a_m0[16] = {
-0,4096,8192,12288,16384,12288,8192,4096,0,-4096,-8192,-12288,0,0,0,0};
+extern short filt16a_l0[16];
 
-short filt16a_l1[16] = {
-20480,16384,12288,8192,4096,0,0,0,0,0,0,0,0,0,0,0};
+extern short filt16a_r0[16];
 
-short filt16a_r1[16] = {
-0,0,0,0,0,0,4096,8192,12288,16384,20480,24576,0,0,0,0};
+extern short filt16a_m0[16];
 
-short filt16a_m1[16] = {
--4096,0,4096,8192,12288,16384,12288,8192,4096,0,-4096,-8192,0,0,0,0};
+extern short filt16a_l1[16];
 
-short filt16a_l2[16] = {
-24576,20480,16384,12288,8192,4096,0,0,0,0,0,0,0,0,0,0};
+extern short filt16a_r1[16];
 
-short filt16a_r2[16] = {
-0,0,0,0,0,0,0,4096,8192,12288,16384,20480,0,0,0,0};
+extern short filt16a_m1[16];
 
-short filt16a_m2[16] = {
--8192,-4096,0,4096,8192,12288,16384,12288,8192,4096,0,-4096,0,0,0,0};
+extern short filt16a_l2[16];
 
-short filt16a_l3[16] = {
-28672,24576,20480,16384,12288,8192,4096,0,0,0,0,0,0,0,0,0};
+extern short filt16a_r2[16];
 
-short filt16a_r3[16] = {
-0,0,0,0,0,0,0,0,4096,8192,12288,16384,0,0,0,0};
+extern short filt16a_m2[16];
 
-short filt16a_m3[16] = {
--12288,-8192,-4096,0,4096,8192,12288,16384,12288,8192,4096,0,0,0,0,0};
+extern short filt16a_l3[16];
 
-short filt16a_l0_dc[16] = {
-16384,12288,8192,4096,0,0,0,0,0,0,0,0,0,0,0,0};
+extern short filt16a_r3[16];
 
-short filt16a_r0_dc[16] = {
-0,0,0,0,0,3276,9830,13107,16384,19660,22937,26214,0,0,0,0};
+extern short filt16a_m3[16];
 
-short filt16a_m0_dc[16] = {
-0,4096,8192,12288,16384,13107,6553,3276,0,-3277,-6554,-9831,0,0,0,0};
+extern short filt16a_l0_dc[16];
 
-short filt16a_l1_dc[16] = {
-16384,12288,8192,4096,0,-4096,0,0,0,0,0,0,0,0,0,0};
+extern short filt16a_r0_dc[16];
 
-short filt16a_r1_dc[16] = {
-0,0,0,0,0,0,6553,9830,13107,16384,19660,22937,0,0,0,0};
+extern short filt16a_m0_dc[16];
 
-short filt16a_m1_dc[16] = {
--4096,0,4096,8192,12288,16384,9830,6553,3276,0,-3277,-6554,0,0,0,0};
+extern short filt16a_l1_dc[16];
 
-short filt16a_l2_dc[16] = {
-26214,22937,19660,16384,13107,9830,6553,0,0,0,0,0,0,0,0,0};
+extern short filt16a_r1_dc[16];
 
-short filt16a_r2_dc[16] = {
-0,0,0,0,0,0,0,4096,8192,12288,16384,20480,0,0,0,0};
+extern short filt16a_m1_dc[16];
 
-short filt16a_m2_dc[16] = {
--6554,-3277,0,3276,6553,6553,16384,12288,8192,4096,0,-4096,0,0,0,0};
+extern short filt16a_l2_dc[16];
 
-short filt16a_l3_dc[16] = {
-26214,22937,19660,16384,13107,9830,3276,0,0,0,0,0,0,0,0,0};
+extern short filt16a_r2_dc[16];
 
-short filt16a_r3_dc[16] = {
-0,0,0,0,0,0,0,0,4096,8192,12288,16384,0,0,0,0};
+extern short filt16a_m2_dc[16];
 
-short filt16a_m3_dc[16] = {
--9831,-6554,-3277,0,3276,6553,9830,16384,12288,8192,4096,0,0,0,0,0};
+extern short filt16a_l3_dc[16];
 
-short filt16a_1[16] = {
-16384,16384,16384,16384,16384,16384,16384,16384,16384,16384,16384,16384};
+extern short filt16a_r3_dc[16];
 
-short filt16a_2l0[16] = {
-16384,12288,8192,4096,-4096,0,0,0,0,0,0,0,0,0,0,0};
+extern short filt16a_m3_dc[16];
 
-short filt16a_2r0[16] = {
-0,4096,8192,12288,16384,20480,0,0,0,0,0,0,0,0,0,0};
+extern short filt16a_1[16];
 
-short filt16a_2l1[16] = {
-20480,16384,12288,8192,4096,0,0,0,0,0,0,0,0,0,0,0};
+extern short filt16a_2l0[16];
 
-short filt16a_2r1[16] = {
--4096,0,4096,8192,12288,16384,0,0,0,0,0,0,0,0,0,0};
+extern short filt16a_2r0[16];
+
+extern short filt16a_2l1[16];
+
+extern short filt16a_2r1[16];
 
 /*filter8*/
-short filt8_l0[8] = {
-16384,8192,0,0,0,0,0,0};
+extern short filt8_l0[8];
+
+extern short filt8_mr0[8];
 
-short filt8_mr0[8] = {
-0,0,0,8192,16384,8192,0,-8192};
+extern short filt8_r0[8];
 
-short filt8_r0[8] = {
-0,8192,16384,24576,0,0,0,0};
+extern short filt8_m0[8];
 
-short filt8_m0[8] = {
-0,8192,16384,8192,0,0,0,0};
+extern short filt8_mm0[8];
 
-short filt8_mm0[8]= {
-0,0,0,8192,16384,8192,0,0};
+extern short filt8_l1[8];
 
-short filt8_l1[8] = {
-24576,16384,0,0,0,0,0,0};
+extern short filt8_ml1[8];
 
-short filt8_ml1[8] = {
--8192,0,8192,16384,8192,0,0,0};
+extern short filt8_r1[8];
 
-short filt8_r1[8] = {
-0,0,8192,16384,0,0,0,0};
+extern short filt8_m1[8];
 
-short filt8_m1[8] = {
-0,0,8192,16384,8192,0,0,0};
+extern short filt8_mm1[8];
 
-short filt8_mm1[8]= {
-0,0,0,0,8192,16384,8192,0};
+#endif
\ No newline at end of file

openair1/PHY/NR_UE_TRANSPORT/nr_ulsch_ue.c

@@ -42,6 +42,7 @@
 #include "PHY/TOOLS/tools_defs.h"
 
 //#define DEBUG_SCFDMA
+//#define DEBUG_PUSCH_MAPPING
 
 
 int generate_ue_ulsch_params(PHY_VARS_NR_UE *UE,
@@ -342,6 +343,7 @@ uint8_t nr_ue_ulsch_procedures(PHY_VARS_NR_UE *UE,
             ((int16_t*)txdataF[ap])[((sample_offsetF)<<1) + 1]);
           #endif
 
+
           dmrs_idx++;
           k_prime++;
           k_prime&=1;

openair1/PHY/defs_gNB.h

@@ -366,11 +366,15 @@ typedef struct {
   /// \brief Hold the channel estimates in time domain based on DRS.
   /// - first index: rx antenna id [0..nb_antennas_rx[
   /// - second index: ? [0..4*ofdm_symbol_size[
-  int32_t **drs_ch_estimates_time;
+  int32_t **ul_ch_estimates_time;
   /// \brief Hold the channel estimates in frequency domain based on DRS.
   /// - first index: rx antenna id [0..nb_antennas_rx[
   /// - second index: ? [0..12*N_RB_UL*frame_parms->symbols_per_tti[
-  int32_t **drs_ch_estimates;
+  int32_t **ul_ch_estimates;
+  /// \brief Uplink channel estimates extracted in PRBS.
+  /// - first index: ? [0..7] (hard coded) FIXME! accessed via \c nb_antennas_rx
+  /// - second index: ? [0..12*N_RB_UL*frame_parms->symbols_per_tti[
+  int32_t **ul_ch_estimates_ext;
   /// \brief Holds the compensated signal.
   /// - first index: rx antenna id [0..nb_antennas_rx[
   /// - second index: ? [0..12*N_RB_UL*frame_parms->symbols_per_tti[
@@ -383,6 +387,28 @@ typedef struct {
   /// - first index: rx antenna id [0..nb_antennas_rx[
   /// - second index: ? [0..12*N_RB_UL*frame_parms->symbols_per_tti[
   int32_t **ul_ch_magb;
+  /// \brief Cross-correlation of two UE signals.
+  /// - first index: rx antenna [0..nb_antennas_rx[
+  /// - second index: symbol [0..]
+  int32_t **rho;
+  /// \f$\log_2(\max|H_i|^2)\f$
+  int16_t log2_maxh;
+  /// \brief Magnitude of Uplink Channel first layer (16QAM level/First 64QAM level).
+  /// - first index: ? [0..7] (hard coded) FIXME! accessed via \c nb_antennas_rx
+  /// - second index: ? [0..168*N_RB_UL[
+  int32_t **ul_ch_mag0;
+  /// \brief Magnitude of Uplink Channel second layer (16QAM level/First 64QAM level).
+  /// - first index: ? [0..7] (hard coded) FIXME! accessed via \c nb_antennas_rx
+  /// - second index: ? [0..168*N_RB_UL[
+  int32_t **ul_ch_mag1[8][8];
+  /// \brief Magnitude of Uplink Channel, first layer (2nd 64QAM level).
+  /// - first index: ? [0..7] (hard coded) FIXME! accessed via \c nb_antennas_rx
+  /// - second index: ? [0..168*N_RB_UL[
+  int32_t **ul_ch_magb0;
+  /// \brief Magnitude of Uplink Channel second layer (2nd 64QAM level).
+  /// - first index: ? [0..7] (hard coded) FIXME! accessed via \c nb_antennas_rx
+  /// - second index: ? [0..168*N_RB_UL[
+  int32_t **ul_ch_magb1[8][8];
   /// measured RX power based on DRS
   int ulsch_power[2];
   /// \brief llr values.
@@ -642,6 +668,9 @@ typedef struct PHY_VARS_gNB_s {
   /// PDSCH DMRS sequence
   uint32_t ****nr_gold_pdsch_dmrs;
   
+  /// PUSCH DMRS
+  uint32_t nr_gold_pusch[2][20][2][52];
+
   /// Indicator set to 0 after first SR
   uint8_t first_sr[NUMBER_OF_UE_MAX];
 

openair1/PHY/impl_defs_top.h

@@ -208,6 +208,7 @@
 
 /// First Amplitude for QAM16 (\f$ 2^{15} \times 2/\sqrt{10}\f$)
 #define QAM16_n1 20724
+
 /// Second Amplitude for QAM16 (\f$ 2^{15} \times 1/\sqrt{10}\f$)
 #define QAM16_n2 10362
 

openair1/SIMULATION/NR_PHY/ulsim.c

@@ -497,6 +497,8 @@ int main(int argc, char **argv)
       //---------------------- count errors ----------------------
       //----------------------------------------------------------
 
+      printf("available_bits = %d\n",available_bits);
+
       for (i = 0; i < available_bits; i++) {
         
         if(((ulsch_ue[0]->g[i] == 0) && (gNB->pusch_vars[UE_id]->llr[i] <= 0)) || 
@@ -511,6 +513,7 @@ int main(int argc, char **argv)
 
       }
 
+
       for (i = 0; i < TBS; i++) {
 
         estimated_output_bit[i] = (ulsch_gNB->harq_processes[harq_pid]->b[i/8] & (1 << (i & 7))) >> (i & 7);