Confussion on roll-off factor, sampling time and Raised Cosine pulses.

1. Which of the statements are the limitations of the raised cosine filters?
2. What is a raised cosine pulse?
3. What is the roll off factor?
4. Why use raised cosine filter?

Which of the statements are the limitations of the raised cosine filters?

Raised cosine filter does not satisfy Nyquist criteria.

What is a raised cosine pulse?

The raised cosine pulse is one type of Nyquist-II pulse. It possesses a transfer function given by. (3.67) where β is called the roll-off factor, which takes values between 0 to 1, and β/2T is called the excess bandwidth. Figure 3.23 illustrates the raised cosine spectral characteristics.

What is the roll off factor?

Roll-off is the steepness of a transfer function with frequency, particularly in electrical network analysis, and most especially in connection with filter circuits in the transition between a passband and a stopband.

Why use raised cosine filter?

A typical use of raised cosine filtering is to split the filtering between transmitter and receiver. Both transmitter and receiver employ square-root raised cosine filters. The combination of transmitter and receiver filters is a raised cosine filter, which results in minimum ISI.