i would go wired to make it a whole lot simpler for you. the first thing you need to do is access the router settings through the web browser. verify dhcp setting is correct and then check the ps3 in the newtork sys settings. heres a link to ps3 network setup.
PS3 120Gig Resistance Series | GT:HD | MGSnake Eater | GT3:A-spec | Warhawk | GT5 Prologue | MGS4 Guns of the Patriots | Socom | Little Big Planet | SFIV | COD4|CODMW2 PSNetwork ID = anoBato