[OAI-UE] fix pucch format2 regression

openair1/PHY/LTE_TRANSPORT/pucch.c

@@ -523,8 +523,29 @@ void generate_pucch2x(int32_t **txdataF,
   pucch2x_modulation(btilde,d,amp);
 
   // add extra symbol for 2a/2b
-
-
+  d[20]=0;
+  d[21]=0;
+  if (fmt==pucch_format2a)
+    d[20] = (B2 == 0) ? amp : -amp;
+  else if (fmt==pucch_format2b) {
+    switch (B2) {
+    case 0:
+      d[20] = amp;
+      break;
+    case 1:
+      d[21] = -amp;
+      break;
+    case 2:
+      d[21] = amp;
+      break;
+    case 3:
+      d[20] = -amp;
+      break;
+    default:
+      AssertFatal(1==0,"Illegal modulation symbol %d for PUCCH %s\n",B2,pucch_format_string[fmt]);
+      break;
+    }
+  }
 
 
 #ifdef DEBUG_PUCCH_TX
@@ -552,7 +573,8 @@ void generate_pucch2x(int32_t **txdataF,
       n_cs = (ncs_cell[ns][l]+nprime)%12;
 
       alpha_ind = 0;
-      for (n=0; n<12; n++) {
+      for (n=0; n<12; n++)
+      {
           // this is r_uv^alpha(n)
           ref_re = (int16_t)(((int32_t)alpha_re[alpha_ind] * ul_ref_sigs[u][v][0][n<<1] - (int32_t)alpha_im[alpha_ind] * ul_ref_sigs[u][v][0][1+(n<<1)])>>15);
           ref_im = (int16_t)(((int32_t)alpha_re[alpha_ind] * ul_ref_sigs[u][v][0][1+(n<<1)] + (int32_t)alpha_im[alpha_ind] * ul_ref_sigs[u][v][0][n<<1])>>15);
@@ -563,47 +585,24 @@ void generate_pucch2x(int32_t **txdataF,
               //LOG_I(PHY,"slot %d ofdm# %d ==> d[%d,%d] \n",ns,l,data_ind,n);
           }
           else {
-	    if (l==1){
-	      ((int16_t *)&zptr[n])[0] = ((int32_t)amp*ref_re>>15);
-	      ((int16_t *)&zptr[n])[1] = ((int32_t)amp*ref_im>>15);
-	    }
-	    else if (fmt==pucch_format2a) {
-	      d[20]=amp;
-	      d[21]=amp;
-	      if (B2 == 0) {
+              if ((l==1) || ( (l==5) && (fmt==pucch_format2) ))
+              {
                   ((int16_t *)&zptr[n])[0] = ((int32_t)amp*ref_re>>15);
                   ((int16_t *)&zptr[n])[1] = ((int32_t)amp*ref_im>>15);
               }
-	      else {
-		((int16_t *)&zptr[n])[0] = -((int32_t)amp*ref_re>>15);
-		((int16_t *)&zptr[n])[1] = -((int32_t)amp*ref_im>>15);
-	      }
-	      //LOG_I(PHY,"slot %d ofdm# %d ==> dmrs[%d] \n",ns,l,n);
+              // l == 5 && pucch format 2a
+              else if (fmt==pucch_format2a)
+              {
+                  ((int16_t *)&zptr[n])[0] = ((int32_t)d[20]*ref_re>>15);
+                  ((int16_t *)&zptr[n])[1] = ((int32_t)d[21]*ref_im>>15);
               }
-	    else if (fmt==pucch_format2b) {
-	      switch (B2) {
-	      case 0: // 1
-		((int16_t *)&zptr[n])[0] = ((int32_t)amp*ref_re>>15);
-		((int16_t *)&zptr[n])[1] = ((int32_t)amp*ref_im>>15);
-		break;
-	      case 1: // -j
-		((int16_t *)&zptr[n])[1] = ((int32_t)amp*ref_re>>15);
-		((int16_t *)&zptr[n])[0] = -((int32_t)amp*ref_im>>15);
-		break;
-	      case 2: // -1
-		((int16_t *)&zptr[n])[0] = -((int32_t)amp*ref_re>>15);
-		((int16_t *)&zptr[n])[1] = -((int32_t)amp*ref_im>>15);
-		break;
-	      case 3: // j
-		((int16_t *)&zptr[n])[1] = -((int32_t)amp*ref_re>>15);
-		((int16_t *)&zptr[n])[0] = ((int32_t)amp*ref_im>>15);
-		break;
-	      default:
-		AssertFatal(1==0,"Illegal modulation symbol %d for PUCCH %s\n",B2,pucch_format_string[fmt]);
-		break;
+              // l == 5 && pucch format 2b
+              else if (fmt==pucch_format2b)
+              {
+                  ((int16_t *)&zptr[n])[0] = ((int32_t)d[20]*ref_re>>15);
+                  ((int16_t *)&zptr[n])[1] = ((int32_t)d[21]*ref_im>>15);
               }
-	    }// fmt==pucch_format2b
-          }// l==1 || l==5
+          } // l==1 || l==5
       alpha_ind = (alpha_ind + n_cs)%12;
       } // n
       zptr+=12;