think you havent explained the context clearly, however..
Normalization generally means "making a level playing field". For example, if you are comparing two modulation schemes, you have to normalize the power before you compare their BERs, means you have to ensure that the transmit power is the same for both, or set both to be 1.
It could also mean other things. Say you have a DMT scheme, and you have to send equal power on all carriers, independent of the modulation scheme (for whatever reason). Then when you chose constellation points, you have to ensure that the average power for a 256 (say) point constellation must be the same as that for a 16-point constellation. So you have to normalize the constellations..
There are many other contexts too..
-b