Dear Naveenta,
You can’t load OptiSystem project to the forum. You may email me (ahmad.atieh@optiwave.com) the project and the Matlab code to provide guidance.
Meanwhile, please note that the signal entered to the Decision component can be standardized levels (+/-1) or not, that is why we’ve added to the Decision component in version 18.0 a field to choose weather there is a DSP or not.