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Analog Digital Communication, Exams of Digital Communication Systems

Srinivas UniversityDigital Communication Systems

UNIT-I Analog Modulation – Need for modulation, AM, DSB-SC, SSB, VSB - Time domain and frequency domain description, single to NE modulation, power relations, Generation & Detection techniques, AM Transmitters, AM Receivers- Super-heterodyne receiver, IF,AGC. UNIT-II Angle Modulation: Phase and Frequency Modulation, Narrow band and Wideband FM, Carson‟s rule, Indirect and direct method of FM generation, Detection of FM, Phase locked loop, Comparison of FM and AM, FM Transmitters, FM Super-heterodyne receiver. UNIT-III Noise in Analog Communication system: Noise in DSB &SSB system, Noise in AM system, Noise in Angle Modulation system, Pre-emphasis and de-emphasis. Pulse Modulation: Time Division Multiplexing, PAM, PWM, PPM-Generation and Detection. UNIT-IV DigitalModulationSystems:PulseModulation:Basebandsignals.Samplingprocess ;QuantizationProcess;QuantizationNoise;Pulse- CodeModulation;NoiseConsiderationsinPCMSystems; Differential Pulse-Code Modulation

Typology: Exams

2021/2022

Available from 12/05/2023

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Unit wise Question Bank
UNIT-1 INTRODUCTION
CO
Kx
1.
Describe Need for modulation and Frequency Division Multiplexing
CO1
K2
2.
Describe Time and frequency domain representation of AM
CO1
K2
3.
Describe Single tone modulation of AM and power calculations
CO1
K2
4.
Explain the Square Law modulator for AM generation.
CO1
K2
5.
A carrier signal c (t) = 6 cos 2π106 t is modulated by m (t) = cos
4π103 t to generate an AM signal with µ = 0.5. Find (i) bandwidth
and power. (ii) Quantity PSB/PC.
CO1
K2
6.
Describe the operation of envelope detector.
CO1
K2
7.
Describe Time and frequency domain representation of DSB-SC
CO1
K2
8.
Describe Single tone modulation of DSB-SC and power calculations
CO1
K2
9.
Explain the synchronous detection of DSB-SC signal.
CO1
K2
10.
Explain the Phase Discrimination method of SSB Generation
CO1
K2
11.
Describe Time and frequency domain representation of SSB-SC
CO1
K1
12.
Describe Single tone modulation of SSB-SC and power calculations
CO1
K1
13.
Describe about VSB
CO1
K2
14.
Explain function of each block of super heterodyne receiver with neat
diagram
CO1
K2
UNIT 2. Angle Modulation
1.
Estimate the time domain equation for narrow band and wide band FM
signals along with the spectrums
CO2
K2
2.
Explain the direct method of FM generation.
CO2
K2
3.
Explain FM generation using Armstrong method with a neat block
diagram.
CO2
K2
4.
Describe the principle of TDM with neat diagram
CO2
K2
5.
Estimate the expression for time domain repression of wide band
Frequency modulated wave.
CO2
K1
6.
Explain the FM Receiver with neat block diagram.
CO2
K2
7.
An angle modulated signal v(t) = 100cos[2πfct+4sin(2000πt)] where
fc=10 MHz i) Determine the average transmitted power ii) Find the
peak phase deviation iii) Determine the peak frequency deviation
iv) Is this FM or a PM signal? Explain
CO2
K2
8.
Comparison of FM and AM.
CO2
K2
UNIT 3. Noise in Analog Communication system & Pulse
Modulation
1.
Describe two methods of generation of the PAM
CO3
K2
2.
Compute the figure of merit in case of DSB-SC communication
System
CO3
K2
3.
Explain briefly i. PWM ii. PPM
CO3
K2
4.
Compute the figure of merit in case of AM System with envelope
detector
CO3
K2
5.
Explain the PPM circuit diagram with related waveforms.
6.
Compute figure of merit of FM System
pf2

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Unit wise Question Bank

UNIT-1 INTRODUCTION CO Kx

1. Describe^ Need for modulation^ and^ Frequency Division Multiplexing^ CO1^ K

2. Describe^ Time and frequency domain representation of AM^ CO1^ K

3. Describe^ Single tone modulation of AM and power calculations^ CO1^ K

4. Explain the Square Law modulator for AM generation. CO1^ K

5. A carrier signal c (t) = 6 cos 2π106 t is modulated by m (t) = cos

4π103 t to generate an AM signal with μ = 0.5. Find (i) bandwidth and power. (ii) Quantity PSB/PC.

CO1 K

6. Describe the operation of envelope detector.^ CO1^ K

7. Describe Time and frequency domain representation of DSB-SC^ CO1^ K

8. Describe^ Single tone modulation of DSB-SC and power calculations^ CO1^ K

9. Explain the synchronous detection of DSB-SC signal.^ CO1^ K

10. Explain the Phase Discrimination method of SSB Generation CO1^ K

11. Describe Time and frequency domain^ representation of SSB-SC^ CO1^ K

12. Describe^ Single tone modulation of SSB-SC and power calculations^ CO1^ K

13. Describe about VSB^ CO1^ K

14. Explain function of each block of super heterodyne receiver with neat

diagram

CO1 K

UNIT 2. Angle Modulation

1. Estimate the time domain equation for narrow band and wide band FM

signals along with the spectrums

CO2 K

2. Explain the direct method of FM generation.^ CO2^ K

3. Explain FM generation using Armstrong method with a neat block

diagram.

CO2 K

4. Describe the principle of TDM with neat diagram CO2^ K

5. Estimate the expression for time domain repression of wide band

Frequency modulated wave.

CO2 K

6. Explain the FM^ Receiver with neat block diagram.^ CO2^ K

7. An angle modulated signal v(t) = 100cos[2πfct+4sin(2000πt)] where

fc=10 MHz i) Determine the average transmitted power ii) Find the peak phase deviation iii) Determine the peak frequency deviation iv) Is this FM or a PM signal? Explain

CO2 K

8. Comparison of FM and AM.^ CO2^ K

UNIT 3. Noise in Analog Communication system & Pulse Modulation

1. Describe two methods of generation of the PAM^ CO3^ K

2. Compute the figure of merit in case of^ DSB-SC communication

System

CO3 K

3. Explain briefly i. PWM ii. PPM^ CO3^ K

4. Compute the figure of merit in case of AM System with envelope

detector

CO3 K

5. Explain the PPM circuit diagram with related waveforms.

6. Compute figure of merit of FM^ System

7. Explain the following terms: i) PAM ii) PWM

8. Compute the noise performance of the SSB-SC system.

UNIT - 4 DIGITAL MODULATION SYSTEMS

1. Discuss the different noise effects in Delta Modulation.^ CO4^ K^2

2. Compare a correlator and^ matched filter^ CO4^ K^2

3. Explain quantization error and derive an expression for maximum SNR

in a PCM system that uses linear quantization.

CO4 K

4. In a binary PCM system, the output signal to quantizing noise ratio is

to be held to a minimum value of 40dB. Determine the number of levels and find the corresponding signal to quantizing noise ratio.

CO4 K

5. Sketch the wave forms for ASK, FSK and PSK and explain each

briefly

CO4 K

6. Explain the generation and reception of DPSK signal with^ example.^ CO4^ K

7. Explain the generation and reception of DM.^ CO4^ K

8. Obtain the probability of error for a Matched filter.^ CO4^ K

UNIT- 5 INFORMATION THEORY AND ERROR CONTROL

CODING

1. What are discrete memoryless channels?^ CO5^ K

2. Explain the^ concept of entropy and its properties^ CO5^ K

3. Discuss in brief about continuous channel capacity.^ CO5^ K^3

4. Derive Shannon^ – Hartley theorem.^ CO5^ K

5. Explain the sequential decoding of convolutional codes with one

example.

CO5 K

6. Briefly describe^ about the Code tree, Trellis and State Diagram for a

Convolution.

CO5 K 3

7. Find the information rate of Telegraph source having two symbols dot

and dash. The dot duration is 0.2 sec. The dash duration is twice as long as the dot and half as probable.

CO5 K 3