Modulation Techniques for Wireless

Introduction
The purpose of analog modulation is to impress an
information-bearing analog waveform onto a carrier for
transmission.
The purpose of digital modulation is to convert an
information-bearing discrete-time symbol sequence into a
continuous-time waveform (perhaps impressed on a carrier).
Key concerns | bandwidth eciency and implementation
complexity. These are aected by:
 baseband pulse shape
 phase transition characteristics
 envelope 
uctuations (channel non-linearities?)