pls help me...i badly need an information about modulation..

kindly help me pls,im going to make a report about PHASE MODULATION on tuesday next week...anyone who has enough knowledge about the said topic,please explain it to me in a very simple way...
PLSPLSPLS

How about this?
http://en.wikipedia.org/wiki/Phase_modulation

I think in the upload/download ebook forum you cna find anything you need.

Refer "Haykin Simon" communication systems