BE PROJECTS
Undergraduate OK?
Then not really needed to do some thing completely new, I suggest you to begin working on one area and learn and learn and then, in graduate level you can develope some thing new.
For now just do some research and make some ideas about what new can be done.
Example: ADSL modems is interesting
Power line communications
and even you can go wireless, doing some research on Digital Radio Receivers, Software Radio, RF MEMs usage in communication systems, Super conducting ADCs .... There is a lot,
Even more,
You can go on multimedia,
Video compression, Audio Processing and compression and so.... These fields are all very interesting.
Good Luck.
( Of course, I'm completely Agree, Look around and see what others need. It is the best source of ideas )