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Chapter: Analog and Digital Communication

Important Short Questions and Answers: Digital Communication

Analog and Digital Communication - Important Short Questions and Answers: Digital Communication

DIGITAL COMMUNICATION

 

1. Define bit rate

 

Bit rate is defined as number of bits transmitted during one second between the transmitter and receiver.

 

2. Define baud rate.

 

Baud rate is defined as the rate of change of signal on transmission medium after encoding and modulation have occurred.

 

3. Define bandwidth efficiency

 

Bandwidth efficiency is the ratio of the transmission bit rate to the minimum bandwidth required for a particular modulation

 

4. Define Digital modulation

 

Digital Modulation is defined as changing the amplitude of the carrier signal with respect to the binary information or digital signal.

 

5. What are the advantages of Digital communications

 

It has a better noise immunity

 

Repeaters can be used between transmitters and receivers

 

It becomes simpler and cheaper as compared to the analog communication

 

 

6. What are the disadvantages of Digital communications

 

It requires a larger channel bandwidth

 

Delta modulation needs synchronization incase of synchronous modulation

 

7. Define Amplitude Shift Keying (ASK).

 

Amplitude Shift Keying is defined as changing the amplitude of the carrier signal with respect to the binary information or digital signal.

 

 

8. Define Phase Shift Keying (PSK).

 

Phase Shift Keying is defined as changing the amplitude of the carrier signal with respect to the binary information or digital signal.

 

 

9. Define Minimum Shift Keying (MSK).

 

The minimum frequency space that allows the 2 fsk representing symbols 0s and 1s. Thus CP (Continuous Phase) FSK signal with a deviation ratio if one half is defined as MSK.

 

 

10. Define Quadrature Amplitude modulation (QAM).

 

QAM is a form of digital modulation similar to PSK except the digital information is contained in both the amplitude and phase of the transmitted carrier.

 

11. Define Frequency Shift Keying (FSK).

 

Frequency Shift Keying is defined as changing the amplitude of the carrier signal with respect to the binary information or digital signal.

 

 

12. What are the advantages of MSK?

 

MSK baseband waveform are smoother compared with QPSK MSK signals have continuous phase It does not have any amplitude variation

 

 

13. What are the advantages of QPSK?

 

Very good noise immunity

 

Effective utilization of available bandwidth

 

Low error probability

 

Very high bit rate data transmission

 

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Analog and Digital Communication : Important Short Questions and Answers: Digital Communication |


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