Instructions
Power on your PSP.
Turn on the WLAN switch on the side of your PSP.
Set your PSP's channel so it matches the channel of the consoles you are connecting to. Scroll to "Settings" on the PSP home menu (called the "cross media bar," or "XMB"), select "Network Settings," then choose "Ad Hoc Mode" to adjust the ad hoc channel settings. To connect to the same ad hoc network, all PSP consoles connecting to the ad hoc network need to be set to "Automatic" or the same channel number.
Insert an ad hoc-compatible game into your PSP and begin the game.
Select the multiplayer mode for the game you're playing. Your PSP will recognize all other consoles playing the same game.