ABSTRACT
Baseband signaling and pulse shaping refers to the way in which a group of source bits is mapped to a baseband transmitted pulse. The shape of the eye diagram is determined by the pulse shape. In general, the faster the baseband pulse decays, the wider the eye opening. In many applications, bandwidth and intersymbol interference are not the only important considerations for selecting baseband pulses. To avoid the problems associated with Nyquist signaling over an ideal bandlimited channel, bandwidth and/or power efficiency must be compromised. The chapter focuses on the spectral characteristics of partial-response (PR) signaling and defers discussion of how to detect the transmitted sequence in the presence of intersymbol interference. Like duobinary PR, modified duobinary allows minimum bandwidth signaling at the Nyquist rate. The chapter concludes with a brief description of baseband pulse shapes used in existing standards for digital mobile cellular systems.
