first you need to make sure u can access your wireless router with no problems and the wireless is turned on for your ps-3...then u need to forward some ports...
Turn on PS3 and goto Settings, Network Settings.
Select Internet Connections. If it asks you want to be disconnected select Yes. Select EASY. Select wireless
Select SCAN this will take a few minutes. The PS3 should find your
router and already have the SSID# so just type in your WEP key. Select save and then wait a couple of minutes then select test. It should hook up.
If it hooks up with NAT3 then you will have to enable UPnP on you router. type in http://192.168.1.1
on your computers web browser.
Click on the advanced tab and then on Universal plug n play and then make sure both check boxes are marked.
Then on the PS3 make sure the UPnP is enabled also in the network settings.
This should give you network and NAT2.
please try this link for port forwarding help:-