For proper operation, check that the units of measurement in the scene are in mm:
Customize - Units setup - System unit setup - mm
The carpet material is made using the Displacement card (make sure that Displacement is enabled in your scene settings).

3 carpet sizes in the scene:
-120*170 cm.
-160*230 cm.
-230*290 cm.

https://www.laredoute.co.uk/ppdp/prod-350231897.aspx 

More carpets: http://3dsky.org/collection/shared/5321350