adding LDPC encoder and decoder (from mwc18 branch)

2018-04-09 13:10:17 -07:00
parent 4b0a1c06c7
commit b61e800764
979 changed files with 21685 additions and 1 deletions
@@ -0,0 +1,111 @@
+/*
+ * 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 ldpc_encoder.c
+ * \brief Defines the LDPC encoder
+ * \author Florian Kaltenberger, Raymond Knopp, Kien le Trung (Eurecom)
+ * \email openair_tech@eurecom.fr
+ * \date 27-03-2018
+ * \version 1.0
+ * \note
+ * \warning
+ */
+
+
+
+#include <stdlib.h>
+#include <math.h>
+#include <stdio.h>
+#include <string.h>
+#include <types.h>
+#include "defs.h"
+
+short *choose_generator_matrix(short BG,short Zc);
+extern short no_shift_values_BG1[1012],pointer_shift_values_BG1[1012],no_shift_values_BG2[2109],pointer_shift_values_BG2[2019];
+
+int encode_parity_check_part_orig(unsigned char *c,unsigned char *d, short BG,short Zc,short Kb,short block_length)
+{
+  short *Gen_shift_values=choose_generator_matrix(BG,Zc);
+  short *no_shift_values, *pointer_shift_values;
+  int no_punctured_columns;
+  short nrows,ncols;
+  int i1,i2,i3,i4,i5,temp_prime;
+  unsigned char channel_temp,temp;
+
+  //if (BG==1)
+  {
+    no_shift_values=(short *) no_shift_values_BG1;
+    pointer_shift_values=(short *) pointer_shift_values_BG1;
+      nrows=46; //parity check bits
+      ncols=22; //info bits
+  }
+  /*else if (BG==2)
+  {
+    no_shift_values=(short *) no_shift_values_BG2;
+    pointer_shift_values=(short *) pointer_shift_values_BG2;
+      nrows=42; //parity check bits
+      ncols=10; //info bits
+  }
+  else {
+    printf("problem with BG\n");
+    return(-1);
+  }
+  */
+
+  no_punctured_columns=(int)((nrows-2)*Zc+block_length-block_length*3)/Zc;
+
+  //printf("no_punctured_columns = %d\n",no_punctured_columns);
+
+  for (i2=0; i2 < Zc; i2++)
+  {
+    //t=Kb*Zc+i2;
+
+    //rotate matrix here
+    for (i5=0; i5 < Kb; i5++)
+    {
+      temp = c[i5*Zc];
+      memmove(&c[i5*Zc], &c[i5*Zc+1], (Zc-1)*sizeof(unsigned char));
+      c[i5*Zc+Zc-1] = temp;
+    }
+
+    // calculate each row in base graph
+    for (i1=0; i1 < nrows-no_punctured_columns; i1++)
+    {
+      channel_temp=0;
+      for (i3=0; i3 < Kb; i3++)
+      {
+        temp_prime=i1 * ncols + i3;
+
+        for (i4=0; i4 < no_shift_values[temp_prime]; i4++)
+        {
+          channel_temp = channel_temp ^ c[ i3*Zc + Gen_shift_values[ pointer_shift_values[temp_prime]+i4 ] ];
+        }
+      }
+      d[i2+i1*Zc]=channel_temp;
+      //channel_input[t+i1*Zc]=channel_temp;
+    }
+  }
+  return(0);
+}
+
+
+
+