Wanted:Project Suggestions For Wireless Communications

I'm a final year student in Electronics and Telecommunications. I'm confused about what project to select and how to go about it,I would appreciate some help!! 😕

Some of the fields I'm interested in,include

-Wireless communication .. 3G,Site Planning and Roll-out
-Satellite Communication
-Cryptography
-Telecommunications Switching Networks

I've also been interested in making a solar powered cell phone, but i have no clue how to go about it !!

PLEASE post your suggestions!!

Many thanks!