Question

In a digital baseband communication system, bits are modelled by using a basic pulse p(t), whose Fourier transform is P(f). If the data rate of the system is 2 kbps, then for which one of the following cases, the baseband signal will be effected by inter symbol interference (ISI)?

• A.
• B.
• C.
• D.

Answer 1

The correct option is C

The condition to be satisfied by the basic pulse to avoid ISI is

${\sum }_{n=-\infty }^{\infty }P(f-n{R}_b)=\text{Constant}$

Except the P(f) given in option (b), remaining all cases will satisfy this condtion.