Hi Hi Fayiqa Naqshbandi ma’m,
there are many software for designing wireless networks and are compatible and easily accessed in combination with optisystem software as well.
We also design wireless system in optisystem software as Aabid sir said previously,
I addition to this we could wireless network part in NS2, NS3, Matlab , iBwave design, ProSoft Wireless Designer and many more.
The suitability and compatibility depends uopn the application and type of design we are having.
http://www.conceptdraw.com/examples/computer-networking
http://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/Education/SchoolsSRA_DG/SchoolsSRA-DG/SchoolsSRA_chap5.html
http://www.prosoft-technology.com/Products/ProSoft-Software/ProSoft-Wireless-Designer
http://www.ibwave.com/products/ibwavedesign.aspx