### CS6304 ANALOG AND DIGITAL COMMUNICATION Two Marks Questions With Answers 2014

Anna University, Chennai

DHANALAKSHMI SRINIVASAN INSTITUTE OF RESEARCH AND TECHNOLOGY SIRUVACHUR-621113

DEPARTMENT OF CSE QUESTION BANK

SUBJECT CODE: CS6304

SUBJECT NAME: ANALOG AND DIGITAL COMMUNICATION

Part-B UNIT-I

ANALOG COMMUNICATION

1.Classification of noise?

-Internal noise

-shot noise

-thermal noise

-transit time noise

-External noise

-Atmospheric noise

-Extraterrestrial noise

-solar noise

-cosmic noise

2.Explain the principle of operation of internal noise with neat diagram?

-Internal noise principle

-operation

-diagram

3. Explain the principle of operation of external noise with neat diagram?

-External noise principle

-operation

-diagram

4.Explain how SSB is generated using amplitude modulation?

-SSB modulation

-operation

-frequency domain description of SSB

-spectrum diagram

-application

5.Comparison between FM and AM.

-modulation index

-cost

-efficiency

-bandwidth

-transmission line

-equation wave

-%modulation

-distance communication

6.Comparison between FM and PM

-modulation index

-cost

-efficiency

-bandwidth

-transmission line

-equation wave

-%modulation

-distance communication

UNIT-II

DIGITAL COMMUNICATION

1.With neat block diagram, explain binary FSK transmitter and receiver?

-binary FSK

-with binary FSK

-Time domain

-bit rate, baud, bandwidth

-modulation index

-FSK transmitter diagram

-operation

2.With neat block diagram, explain binary PSK transmitter and receiver?

-PSK Definition

-Binary PSK

-Operation

-Bandwidth consideration of BPSK

3.With neat block diagram, explain binary QPSK transmitter and receiver?

-Definition

-operation

-Waveform

-bandwidth consideration of QPSK

4.With neat block diagram, explain binary QAM transmitter and receiver?

-Definition

-operation

-Waveform

-bandwidth consideration of QAM

-Definition

-Normalized binary waveform

-operation

-input and output waveform

-binary data scheme case 1 and case 2

6.Compare the performance of PSK and FSK.

-encoding scheme

-output possible

-minimum bandwidth

-bit rate

-bandwidth efficiency

7.Compare QPSK and BPSK.

-encoding scheme

-output possible

-minimum bandwidth

-bit rate

-bandwidth efficiency

8.Give the generation and detection of FSK.

-modulation index

-FSK transmitter diagram

-operation

9.Explain PSK.

-modulation index

-FSK transmitter diagram

-operation

10.Explain how QPSK signal can be generated and recovered?

-offset definition

-diagram

-operation

-conversional QPSK

UNIT-III

DATA AND PULSE COMMUNICATION

1.Explain the principle of PAM with neat blockdiagram?

-pulse amplitude modulation principle

-block diagram

-operation

-waveform

2.Explain PCM with neat block diagram?

-pulse code modulation concept

-block diagram

-operation

-waveform

3.Explain PPM.

-pulse position modulation concept

-block diagram

-operation

-waveform

4.Explain the principle PTM.

-pulse time modulation principle

-block diagram

-operation

-waveform

5.Derive the output signal to noise ratio in PCM.

-wave form of output signal

-PCM code=sample voltage/revaluation

-SNR(db)=10log(V2/(q2/12))

UNIT-IV

SOURCE AND ERROR CONTROL CODING

1.Explain about coding and decoding of linear block code?

-Principle of block coding

-Systematic codes

-Non-systematic code

-line code

-Matrix representation

-check bit

-code words

-message

-code rate

-subclass of linear block codes

-easy

-act as a shift register

4.Give the properties of cyclic codes?

-hamming code

-BCH code

-RS code

5.Explain convolution coding with block diagrams?

-basic concept

-block diagram

-operation

-Important terms

-code rate

-length

-dimension

-polynomial expression

6.Explain the concept of viterbi algorithm?

-concept

-diagram

-operation

7.Explain the concept of channel capacity coding?

-channel capacity

-mutual information

-average mutual information

8.Explain the procedure of channel coding theorem?

-channel systematic

-channel entropy

-conditional probability.

UNIT-V

1.Explain the concept of CDMA techniques and mention its advantages and disadvantages.

-encoder and decoder

-block diagram

-operation

-data alignment

-bandwidth

-impurity to interference

2.Explain the applications of CDMA in wireless communication?

-military and commercial

-mobile communication

-satellite communication

-expensive tracking equipment

-no transmission break

-effect of Doppler shift are negligible

-higher transmitter power

-longer propagation delay

4.What are the benefits of satellite communication systems?

-efficient utilization of channel bandwidth

5.Give notes on satellite sub-systems?