PUSCH modulation

openair1/PHY/NR_UE_TRANSPORT/nr_transport_proto_ue.h

@@ -1056,11 +1056,11 @@ int nr_ulsch_encoding(NR_UE_ULSCH_t *ulsch,
                      uint8_t harq_pid);
 
 /*! \brief Perform PUSCH scrambling. TS 38.211 V15.4.0 subclause 6.3.1.1
-  @param[in] in Pointer to input bits
-  @param[in] size of input bits
-  @param[in] Nid cell id
-  @param[in] n_RNTI CRNTI
-  @param[out] out the scrambled bits
+  @param[in] in, Pointer to input bits
+  @param[in] size, of input bits
+  @param[in] Nid, cell id
+  @param[in] n_RNTI, CRNTI
+  @param[out] out, the scrambled bits
 */
 
 void nr_pusch_codeword_scrambling(uint8_t *in,
@@ -1070,6 +1070,19 @@ void nr_pusch_codeword_scrambling(uint8_t *in,
                          uint32_t* out);
 
 
+/*! \brief Perform PUSCH modulation. TS 38.211 V15.4.0 subclause 6.3.1.2
+  @param[in] in, Pointer to input bits
+  @param[in] Qm, modulation order
+  @param[in] length, size of input bits
+  @param[out] out, complex valued modulated symbols
+*/
+
+void nr_pusch_codeword_modulation(uint32_t *in,
+                         uint8_t  Qm,
+                         uint32_t length,
+                         int16_t *out);
+
+
 uint32_t  nr_dlsch_decoding_mthread(PHY_VARS_NR_UE *phy_vars_ue,
 						 UE_nr_rxtx_proc_t *proc,
                          int eNB_id,
@@ -1115,7 +1128,7 @@ uint32_t dlsch_decoding_emul(PHY_VARS_NR_UE *phy_vars_ue,
     @param first_symbol_flag set to 1 on first DLSCH symbol
     @param rx_type. rx_type=RX_IC_single_stream will enable interference cancellation of a second stream when decoding the first stream. In case of TM1, 2, 5, and this can cancel interference from a neighbouring cell given by eNB_id_i. In case of TM5, eNB_id_i should be set to n_connected_eNB to perform multi-user interference cancellation. In case of TM3, eNB_id_i should be set to eNB_id to perform co-channel interference cancellation; this option should be used together with an interference cancellation step [...]. In case of TM3, if rx_type=RX_IC_dual_stream, both streams will be decoded by applying the IC single stream receiver twice.
     @param i_mod Modulation order of the interfering stream
-*/
+
 int32_t nr_rx_pdsch(PHY_VARS_NR_UE *phy_vars_ue,
                  PDSCH_t type,
                  uint8_t eNB_id,
@@ -1127,7 +1140,7 @@ int32_t nr_rx_pdsch(PHY_VARS_NR_UE *phy_vars_ue,
                  RX_type_t rx_type,
                  uint8_t i_mod,
                  uint8_t harq_pid);
-
+*/
 int32_t nr_rx_pdcch(PHY_VARS_NR_UE *ue,
                     uint32_t frame,
                     uint8_t nr_tti_rx,

openair1/PHY/NR_UE_TRANSPORT/nr_ulsch.c

@@ -30,7 +30,11 @@
 * \warning
 */
 #include <stdint.h>
+#include "common/utils/assertions.h"
 #include "PHY/NR_TRANSPORT/nr_transport_common_proto.h"
+#include "PHY/defs_nr_common.h"
+
+extern short nr_mod_table[NR_MOD_TABLE_SIZE_SHORT];
 
 
 
@@ -64,3 +68,28 @@ void nr_pusch_codeword_scrambling(uint8_t *in,
   }
 
 }
+
+// This function is copied from PHY/NR_TRANSPORT/nr_dlsch.c
+void nr_pusch_codeword_modulation(uint32_t *in,
+                         uint8_t  Qm,
+                         uint32_t length,
+                         int16_t *out) {
+
+  uint16_t offset = (Qm==2)? NR_MOD_TABLE_QPSK_OFFSET : (Qm==4)? NR_MOD_TABLE_QAM16_OFFSET : \
+                    (Qm==6)? NR_MOD_TABLE_QAM64_OFFSET: (Qm==8)? NR_MOD_TABLE_QAM256_OFFSET : 0;
+  AssertFatal(offset, "Invalid modulation order %d\n", Qm);
+
+  for (int i=0; i<length/Qm; i++) {
+    uint8_t idx = 0, b_idx;
+
+    for (int j=0; j<Qm; j++) {
+      b_idx = (i*Qm+j)&0x1f;
+      if (i && (!b_idx))
+        in++;
+      idx ^= (((*in)>>b_idx)&1)<<(Qm-j-1);
+    }
+
+    out[i<<1] = nr_mod_table[(offset+idx)<<1];
+    out[(i<<1)+1] = nr_mod_table[((offset+idx)<<1)+1];
+  }
+}

openair1/SIMULATION/NR_PHY/ulschsim.c

@@ -562,7 +562,7 @@ int main(int argc, char **argv) {
   //printf("crc32: [0]->0x%08x\n",crc24c(test_input, 32));
   // generate signal
 
-  /////////////////////////[adk] ULSCH coding/////////////////////////
+  /////////////////////////ULSCH coding/////////////////////////
   ///////////
 
   if (input_fd == NULL) {
@@ -572,7 +572,7 @@ int main(int argc, char **argv) {
   ///////////
   ////////////////////////////////////////////////////////////////////
 
-  /////////////////////////[adk] ULSCH scrambling/////////////////////////
+  /////////////////////////ULSCH scrambling/////////////////////////
   ///////////
 
   uint32_t scrambled_output[NR_MAX_NB_CODEWORDS][NR_MAX_PDSCH_ENCODED_LENGTH>>5];
@@ -594,6 +594,18 @@ int main(int argc, char **argv) {
   /////////////
   //////////////////////////////////////////////////////////////////////////
 
+  /////////////////////////ULSCH modulation/////////////////////////
+  ///////////
+
+  nr_pusch_codeword_modulation(scrambled_output[0], // assume one codeword for the moment
+                               mod_order,
+                               encoded_length,
+                               ulsch_ue->d);
+
+
+  ///////////
+  ////////////////////////////////////////////////////////////////////////
+
   for (SNR = snr0; SNR < snr1; SNR += snr_step) {
     n_errors = 0;
     n_false_positive = 0;