here's a post i made in another thread... see if this would work for you.
I've been looking for this exact thing for some time now. What I do is tether my phone to my computer and then use the program from
http://connectify.me/ with one of the access point cards... I use this
http://www.microcenter.com/single_pr...uct_id=0305492 This will broadcast the wifi network you need. I know its a horrid work-around but does the trick when trying to connect things like the PS3 that don't see ad-hoc networks. Probably should mention that this particular program only runs on a PC running windows7.