Exam Details
| Subject | Analog Communication | |
| Paper | ||
| Exam / Course | BTCVI / BTECVI / BTELVI | |
| Department | School of Engineering & Technology (SOET) | |
| Organization | indira gandhi national open university | |
| Position | ||
| Exam Date | June, 2015 | |
| City, State | new delhi, |
Question Paper
Explain variance and standard deviation of a random variable.
Find the cross co-relation between the two given functions:
P1 cos wot
=P2 sin wot
Explain how frequency modulation may be obtained from a phase modulator.
Find the total modulated power, sideband power and net modulation index for the AM signal given by the following expression
10 cos (2n 5 cos (2n cos (2n 2 cos (2n cos (4n 10^3
A single tone Em cos modulating signal is used to generate a VSB signal.
1/2 a Em Ec cos (Wc Wm)t 1/2 Em cos (Wc -Wm)t.
where a is a constant less than unity, representing the attenuation of upper side frequency.
Find the quadrature component of VSB signal
The VSB signal, plus the carrier Ec cos Wc t is passed through an Envelope detector. Determine the distortion produced by the quadrature component.
Deduce and compare the figure of merit in the following cases
Amplitude modulation
DSB-SC
SSB
Compute the correlation of white Gaussian noise having zero mean and power spectral density of No/2 with a sinusoidal wave sqrt(2/T) cos (2n fc t).
Prove that a narrowband FM signal requires essentially the same transmission bandwidth as that of AM signal.
Explain with a suitable block diagram for demodulating of DSB-SC signal using Costas receiver.
What is meant by diagonal clipping In Envelope detector?
Draw and explain the block diagram of Weaver's method for generating SSB modulated waves.
What is meant by Pre-emphasis. and De-emphasis in FM
What are the non-linear effects In FM system?
Generate an SSB wave using phase discrimination method.
What are the limitations of Amplitude modulation?
Prove that if a Gaussian process is applied to a stable linear filter, then the random process Yet) developed at the output of the filter is also Gaussian.
State Central limit theorem.
Describe the principle of working of linearised model of phase locked loop and show that the output voltage is proportional to change in frequency in FM signal.
10. Write short notes on any two of the following:
Superheterodyne Receiver
Frequency Division Multiplexing
Properties of Hilbert Transform
Find the cross co-relation between the two given functions:
P1 cos wot
=P2 sin wot
Explain how frequency modulation may be obtained from a phase modulator.
Find the total modulated power, sideband power and net modulation index for the AM signal given by the following expression
10 cos (2n 5 cos (2n cos (2n 2 cos (2n cos (4n 10^3
A single tone Em cos modulating signal is used to generate a VSB signal.
1/2 a Em Ec cos (Wc Wm)t 1/2 Em cos (Wc -Wm)t.
where a is a constant less than unity, representing the attenuation of upper side frequency.
Find the quadrature component of VSB signal
The VSB signal, plus the carrier Ec cos Wc t is passed through an Envelope detector. Determine the distortion produced by the quadrature component.
Deduce and compare the figure of merit in the following cases
Amplitude modulation
DSB-SC
SSB
Compute the correlation of white Gaussian noise having zero mean and power spectral density of No/2 with a sinusoidal wave sqrt(2/T) cos (2n fc t).
Prove that a narrowband FM signal requires essentially the same transmission bandwidth as that of AM signal.
Explain with a suitable block diagram for demodulating of DSB-SC signal using Costas receiver.
What is meant by diagonal clipping In Envelope detector?
Draw and explain the block diagram of Weaver's method for generating SSB modulated waves.
What is meant by Pre-emphasis. and De-emphasis in FM
What are the non-linear effects In FM system?
Generate an SSB wave using phase discrimination method.
What are the limitations of Amplitude modulation?
Prove that if a Gaussian process is applied to a stable linear filter, then the random process Yet) developed at the output of the filter is also Gaussian.
State Central limit theorem.
Describe the principle of working of linearised model of phase locked loop and show that the output voltage is proportional to change in frequency in FM signal.
10. Write short notes on any two of the following:
Superheterodyne Receiver
Frequency Division Multiplexing
Properties of Hilbert Transform
Other Question Papers
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Subjects
- Advance Microprocessor And Architecture
- Analog and Mixed Mode VLSI Design
- Analog Communication
- Analog Electronic Circuits
- Analog Integrated Circuits Design
- Antennas and Propagation
- B10-Informatics
- Basics Of Electronics Engineering
- Computer Architecture
- Computer Communication Networks
- Control Engineering
- Data Communication And Network
- Device Modelling For Circuit Simulation
- Digital Electronics
- Digital Signal Processing
- Digital System Design
- Electromagnetic Field Theory
- Electronic Measurement and Inst
- Electronic Switching Circuits
- Embedded System Design
- Information Theory And Coding
- Linear Integrated Circuits
- Microcontrollers
- Microprocessor And Its Applications
- Microwave And Radar Engineering
- Multirate Systems
- Optical Fiber Communication
- Power Electronics
- Satellite And Tv Engineering
- Signal And Systems
- Wireless Communication