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
-Manmade 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
-advantages
-disadvantages
-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
-FSK receiver diagram
-operation
2.With neat block diagram, explain binary PSK transmitter and receiver?
-PSK Definition
-Binary PSK
-Transmitter and Receiver block diagram
-Operation
-Bandwidth consideration of BPSK
3.With neat block diagram, explain binary QPSK transmitter and receiver?
-Definition
-Transmitter and receiver block diagram
-operation
-Waveform
-bandwidth consideration of QPSK
4.With neat block diagram, explain binary QAM transmitter and receiver?
-Definition
-Transmitter and receiver block diagram
-operation
-Waveform
-bandwidth consideration of QAM
5.With neat block diagram, explain binary ASK transmitter and receiver?
-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
-FSK receiver diagram
-operation
9.Explain PSK.
-modulation index
-FSK transmitter diagram
-FSK receiver diagram
-operation
10.Explain how QPSK signal can be generated and recovered?
-offset definition
-diagram
-operation
-conversional QPSK
-advantage and disadvantage
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
2.Explain about hamming code?
-check bit
-code words
-message
-code rate
3.What are the cyclic codes? And explain the advantage and disadvantage?
-subclass of linear block codes
-advantage
-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
MULTI-USER RADIO COMMUNICATION
1.Explain the concept of CDMA techniques and mention its advantages and disadvantages.
-encoder and decoder
-block diagram
-operation
-data alignment
-advantage
-bandwidth
-impurity to interference
2.Explain the applications of CDMA in wireless communication?
-military and commercial
-spread spectrum
-mobile communication
-satellite communication
3.What is geosynchronous satellite? Mention its advantages and disadvantages?
-advantage
-expensive tracking equipment
-shadow 100%
-no transmission break
-effect of Doppler shift are negligible
-disadvantage
-higher transmitter power
-longer propagation delay
4.What are the benefits of satellite communication systems?
-efficient utilization of channel bandwidth
-used in radar communication
5.Give notes on satellite sub-systems?
-uplink model
-downlink model
-transponder
-diagram and its operation
.
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