MCS-042 Data Communication and Computer Network Solved Assignment 2019-2020

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Q1. (a) What is the need of modulating a signal? Will it be a right approach to send the    information as the signal itself?   
Ans: Modulation is the process of mixing a low energy message signal with the high energy carrier signal to produce a new high energy signal which carries information to a long distance.
Modulation is the process of changing the characteristics (amplitude, frequency or phase) of the carrier signal, in accordance with the amplitude of the message signal.A device that performs modulation is called modulator. 

Need for Modulation

Modulation is extremely necessary in communication system because of the following reasons:
1) Avoids mixing of signals
2) Increase the range of communication
3) Wireless communication
4) Reduces the effect of noise
5) Reduces height of antenna

Q1. (b) Explain techniques used in digital to analog modulation with the help of diagram.
Ans: Coming Soon...
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