Added "nr_ulsch_unscrambling" + Tested scrambling and unscrambling chain in "ulsim.c" (works)

- Added "nr_ulsch.c" file in NR_TRANSPORT
- Renamed "nr_ulsch.c" in NR_UE_TRANSPORT to "nr_ulsch_ue.c"
- Added "nr_ulsch_unscrambling" declaration to "nr_ulsch.h"
- Added "nr_ulsch_unscrambling" definition to "nr_ulsch.c"
- Added new test in "ulsim.c" to test encoding/decoding + scrambling/unscrambling

cmake_targets/CMakeLists.txt

@@ -1282,6 +1282,7 @@ set(PHY_SRC_UE
   ${OPENAIR1_DIR}/PHY/NR_TRANSPORT/nr_dlsch_tools.c
   ${OPENAIR1_DIR}/PHY/NR_TRANSPORT/nr_dlsch_coding.c
   ${OPENAIR1_DIR}/PHY/NR_TRANSPORT/nr_ulsch_decoding.c
+  ${OPENAIR1_DIR}/PHY/NR_TRANSPORT/nr_ulsch.c
   ${OPENAIR1_DIR}/PHY/NR_TRANSPORT/nr_tbs_tools.c
   ${OPENAIR1_DIR}/PHY/NR_TRANSPORT/nr_sch_dmrs.c
   ${OPENAIR1_DIR}/PHY/NR_REFSIG/nr_gold.c
@@ -1324,7 +1325,7 @@ set(PHY_SRC_UE
   ${OPENAIR1_DIR}/PHY/NR_UE_TRANSPORT/dci_nr.c
   ${OPENAIR1_DIR}/PHY/NR_UE_TRANSPORT/dci_tools_nr.c
   ${OPENAIR1_DIR}/PHY/NR_UE_TRANSPORT/pucch_nr.c
-  ${OPENAIR1_DIR}/PHY/NR_UE_TRANSPORT/nr_ulsch.c
+  ${OPENAIR1_DIR}/PHY/NR_UE_TRANSPORT/nr_ulsch_ue.c
   ${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/PHY/NR_TRANSPORT/nr_ulsch.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
+ */
+
+/*! \file PHY/NR_TRANSPORT/nr_ulsch.c
+* \brief Top-level routines for the reception of the PUSCH TS 38.211 v 15.4.0
+* \author Ahmed Hussein
+* \date 2019
+* \version 0.1
+* \company Fraunhofer IIS
+* \email: ahmed.hussein@iis.fraunhofer.de
+* \note
+* \warning
+*/
+
+#include <stdint.h>
+#include "PHY/NR_TRANSPORT/nr_transport_common_proto.h"
+#include "PHY/NR_TRANSPORT/nr_ulsch.h"
+
+void nr_ulsch_unscrambling(int16_t* llr,
+                         uint32_t size,
+                         uint8_t q,
+                         uint32_t Nid,
+                         uint32_t n_RNTI) 
+{
+  uint8_t reset;
+  uint32_t x1, x2, s=0;
+
+  reset = 1;
+  x2 = (n_RNTI<<15) + Nid;
+
+  for (uint32_t i=0; i<size; i++) {
+    if ((i&0x1f)==0) {
+      s = lte_gold_generic(&x1, &x2, reset);
+      reset = 0;
+    }
+    if (((s>>(i&0x1f))&1)==1)
+      llr[i] = -llr[i];
+  }
+}
\ No newline at end of file

openair1/PHY/NR_TRANSPORT/nr_ulsch.h

@@ -36,6 +36,19 @@ void free_gNB_ulsch(NR_gNB_ULSCH_t *ulsch);
 
 NR_gNB_ULSCH_t *new_gNB_ulsch(uint8_t max_ldpc_iterations,uint8_t N_RB_UL, uint8_t abstraction_flag);
 
+
+/*! \brief Perform PUSCH decoding. TS 38.212 V15.4.0 subclause 6.2
+  @param phy_vars_gNB, Pointer to PHY data structure for gNB
+  @param UE_id, ID of UE transmitting this PUSCH
+  @param ulsch_llr, Pointer to received llr in ulsch
+  @param frame_parms, Pointer to frame descriptor structure
+  @param nb_symb_sch, number of symbols used in the uplink shared channel
+  @param nr_tti_rx, current received TTI
+  @param harq_pid, harq process id
+  @param is_crnti
+  @param llr8_flag If 1, indicate that the 8-bit decoder should be used
+*/
+
 uint32_t nr_ulsch_decoding(PHY_VARS_gNB *phy_vars_gNB,
                            uint8_t UE_id,
                            short *ulsch_llr,
@@ -47,3 +60,18 @@ uint32_t nr_ulsch_decoding(PHY_VARS_gNB *phy_vars_gNB,
                            uint8_t is_crnti,
                            uint8_t llr8_flag);
 
+
+/*! \brief Perform PUSCH unscrambling. TS 38.211 V15.4.0 subclause 6.3.1.1
+  @param llr, Pointer to llr bits
+  @param size, length of llr bits
+  @param q, codeword index (0,1)
+  @param Nid, cell id
+  @param n_RNTI, CRNTI
+*/
+
+void nr_ulsch_unscrambling(int16_t* llr,
+                         uint32_t size,
+                         uint8_t q,
+                         uint32_t Nid,
+                         uint32_t n_RNTI);
+

openair1/PHY/NR_UE_TRANSPORT/nr_ulsch.c → openair1/PHY/NR_UE_TRANSPORT/nr_ulsch_ue.c

@@ -65,4 +65,4 @@ void nr_pusch_codeword_scrambling(uint8_t *in,
     //printf("i %d b_idx %d in %d s 0x%08x out 0x%08x\n", i, b_idx, in[i], s, *out);
   }
 
-}
\ No newline at end of file
+}