Digital receivers for the reception of non pulse shaped signals [closed]

1. Why is pulse shaping required for digital communication?
2. What is pulse in digital communication?
3. How does pulse shaping reduce ISI?
4. Why do we use raised cosine filter?

Why is pulse shaping required for digital communication?

In communications systems, two important requirements of a wireless communications channel demand the use of a pulse shaping filter. These requirements are: 1) generating bandlimited channels, and 2) reducing inter symbol interference (ISI) from multi-path signal reflections.

What is pulse in digital communication?

A pulse in signal processing is a rapid, transient change in the amplitude of a signal from a baseline value to a higher or lower value, followed by a rapid return to the baseline value.

How does pulse shaping reduce ISI?

ISI can cause problems during the reception of signals. Pulse shaping is the process of choosing the time-domain and spectral shape of symbols so that pulses do not spread or overlap. Nyquist pulse shaping criterion introduced at the transmission end leads to improved signal reception without ISI.

Why do we use raised cosine filter?

Raised cosine filters are used for pulse shaping, where the signal is upsampled. Therefore, we also need to specify the upsampling factor.