adding llr clipping + other bugfixes

openair1/PHY/CODING/TESTBENCH/ldpctest.c

@@ -91,6 +91,7 @@ int test_ldpc(short No_iteration,
   //Table of possible lifting sizes
   short lift_size[51]= {2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,18,20,22,24,26,28,30,32,36,40,44,48,52,56,60,64,72,80,88,96,104,112,120,128,144,160,176,192,208,224,240,256,288,320,352,384};
   int n_segments=8;
+  int N; //length encoded block
 
   t_nrLDPC_dec_params decParams;
   int n_iter;
@@ -165,7 +166,12 @@ int test_ldpc(short No_iteration,
     }
   }
 
-  printf("ldpc_test: block_length %d, BG %d, Zc %d, Kb %d\n",block_length,BG, Zc, Kb);
+  if (BG==1)
+    N=66*Zc;
+  else if (BG==2)
+    N=50*Zc;
+
+  printf("ldpc_test: block_length %d, BG %d, Zc %d, Kb %d, N %d\n",block_length,BG, Zc, Kb, N);
   no_punctured_columns=(int)((nrows-2)*Zc+block_length-block_length*(1/((float)nom_rate/(float)denom_rate)))/Zc;
   //  printf("puncture:%d\n",no_punctured_columns);
   removed_bit=(nrows-no_punctured_columns-2) * Zc+block_length-(int)(block_length/((float)nom_rate/(float)denom_rate));
@@ -219,8 +225,13 @@ int test_ldpc(short No_iteration,
           modulated_input[i]=-1/sqrt(2);
 
         channel_output[i] = modulated_input[i] + gaussdouble(0.0,1.0) * 1/sqrt(2*SNR);
+	if (channel_output[i]>1.0)
+	  channel_output_fixed[i]=127;
+	else if (channel_output[i]<-1.0)
+	  channel_output_fixed[i]=-128;
+	else
 	  channel_output_fixed[i] = (char) ((channel_output[i]*128)<0?(channel_output[i]*128-0.5):(channel_output[i]*128+0.5)); //fixed point 9-7
-	//printf("llr[%d]=%d\n",i,channel_output_fixed[i]);
+	//printf("llr[%d]=%d (%f)\n",i,channel_output_fixed[i],channel_output[i]);
       }
 
       /*
@@ -239,7 +250,7 @@ int test_ldpc(short No_iteration,
       // decoder supports BG2, Z=128 & 256
       //estimated_output=ldpc_decoder(channel_output_fixed, block_length, No_iteration, (double)((float)nom_rate/(float)denom_rate));
 
-      nrLDPC_decoder(&decParams, channel_output_fixed, estimated_output, NULL);
+      n_iter = nrLDPC_decoder(&decParams, channel_output_fixed, estimated_output, NULL);
 
       //for (i=(Kb+nrows) * Zc-5;i<(Kb+nrows) * Zc;i++)
       //  printf("esimated_output[%d]=%d\n",i,esimated_output[i]);

openair1/PHY/CODING/nrLDPC_encoder/ldpc_encoder.c

@@ -50,14 +50,14 @@ int encode_parity_check_part_orig(unsigned char *c,unsigned char *d, short BG,sh
   int i1,i2,i3,i4,i5,temp_prime;
   unsigned char channel_temp,temp;
 
-  //if (BG==1)
+  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)
+  else if (BG==2)
   {
     no_shift_values=(short *) no_shift_values_BG2;
     pointer_shift_values=(short *) pointer_shift_values_BG2;
@@ -68,7 +68,7 @@ int encode_parity_check_part_orig(unsigned char *c,unsigned char *d, short BG,sh
     printf("problem with BG\n");
     return(-1);
   }
-  */
+  
 
   no_punctured_columns=(int)((nrows-2)*Zc+block_length-block_length*3)/Zc;