The controllers are broadcasting in RF, not 802.11b wifi, which is incompatible and a different standard. ^_^; What you're suggesting is like trying to control your television (ir-infrared) with your wireless controller (rf-radio). =D Unless you can blue shift it by -alot-.. but that's not possible, so let's not get into that.
What would probably serve you better is the mod for your PSP that allows you to not only output the image to the television, but lets you use a PS2 controller to control the PSP. This would be able to do what what want, though I can't vouch for the wireless controller (I'm fairly confident that it'd work, though).
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