Communication System

1. What is Nyquist Rate and it is expressed in ?
A- 2 f(max), Samples per second

2. A signal is having maximum frequency of 10 Khz and it is sampled at nyquist rate , what is the time interval between the two successive samples ?
A- 50 micro seconds

3. What is the major advantage of sampling ?
A- Higher communication speed

4. In communication system the noise effects mainly which block ?
A- Channel

5. Why is low pass filter used in communication (after sampling )?
A- To get cack the original signal from the sampled signal

6. Define Channel capacity ?
A- it is amount of the information per second

7. Formula for channel capacity is ?
A- B log(1+ (S/N)) , here the base of log is 2

8. What is the expression for the Gaussian Probability density function ?
A- f(x) = 1 / (2 pi sigma^2)^1/2

9. What is the value of one 'Dit' ?
A- 3.32 bits , it is the unit of Information

10 . What will be the value of amount of information i n a Continuous Signal ?
A- Infinity