1.What
are the advantages of digital communication/
-transmission quality high
-Effect of noise, distortion and
interference is less in a communication system.
-Digital circuits are more reliable
and cheaper compared to analog circuits
2.What
are the disadvantages of digital communication?
-Large System Bandwidth
-System Synchronization
3.What
are the performance measure of communication systems?
-Spectral Efficiency
-Bit Error Rate
-Bandwidth Utilization
4.Define
Sampling.
The process of conversion of analog
signal into digital signal is called sampling. There are two types of sampling
1.Impulse sampling 2. Natural Sampling
5.What
is meant by Alaising effect?
Alaising effect takes place when the
sampling frequency is less than nyquist rate. During this condition the
spectrum of sampled signal overlaps itself. So high frequency takes the form of
low frequency. This interference is called as aliasing effect.
