Any Wifi specialist here?

This is what I want to do but not sure if possible.

Got my ADSL Router in some corner in my house it has wifi but does not cover where our tv is with my ps3 and Home entertainment system.

I wish to connect a wireless AP to the ps3 and Home entertainment with a Ethernet cable. And let the WIFI connect wireless to the ADLS router in the other room. Without having to connect the ADSL router with the AP with a Ethernet cable.