correction of scrambling sequence initialization in phich.c (rx_phich)

openair1/PHY/LTE_TRANSPORT/phich.c

@@ -1120,7 +1120,7 @@ void rx_phich(PHY_VARS_UE *ue,
   phich_d_ptr = phich_d;
 
   // x1 is set in lte_gold_generic
-  x2 = (((subframe+1)*(frame_parms->Nid_cell+1))<<9) + frame_parms->Nid_cell;
+  x2 = (((subframe+1)*((frame_parms->Nid_cell<<1)+1))<<9) + frame_parms->Nid_cell;
 
   s = lte_gold_generic(&x1, &x2, reset);