whether ur using wireless or wired isnt the issue. you have to be sure to open ur ports and set wireless up on ur router correctly. took me a while before i understood that completely. you have to make an IP address for ur ps3 manually and a you have to get ur DNS and ip from ur router and such. the open the right ports pretty much.
EDIT: ports to open are: 80 BOTH, 443 BOTH, 5223 BOTH, 3478-3479 BOTH, 3658 BOTH
but i already have wireless connections and i cant, im thinking of getting wired, does that work well?
No i did the same thing as well, well its coming from the router so maybe its just me, U can give it a try, tell me if it works.