Maybe u can find better topics by just searching on net.
But projects on present problems are alwys good.
1)Issues of using 1,000 different devices in the same wireless spectrum (microwaves, wireless phones, wireless routers), why did they all pick the same one, what can be done to avoid interference.
2)How to limit a wi-fi hotspot's range to keep inside a building. How to do the same with many rooms next to each other.