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1
GATE ECE 1991
Fill in the Blanks
+2
-0
For the signal constellation shown in the figure, the type of modulation is ________. GATE ECE 1991 Communications - Digital Communication Systems Question 45 English
2
GATE ECE 1990
MCQ (Single Correct Answer)
+2
-0.6
In a BPSK signal detector, the local oscillator has a fixed phase error of 200. This phase error deteriorates the SNR at the output by a factor of
A
$$\cos {20^0}$$
B
$${\cos ^2}{20^0}$$
C
$$\cos {70^0}$$
D
$${\cos ^2}{70^0}$$
3
GATE ECE 1989
MCQ (More than One Correct Answer)
+2
-0
In binary data transmission DPSK is preferred to PSK because
A
a coherent carrier is not required to be generated at the receiver.
B
for a given energy per bit, the probability of error is less.
C
the 1800 phase shifts of the carrier are unimportant.
D
more protection is provided against impulse noise.
4
GATE ECE 1988
MCQ (Single Correct Answer)
+2
-0.6
The transfer function of a zero - order hold is
A
$${{1 - \exp \left( { - Ts} \right)} \over s}$$
B
$${{1 - \exp \left( { - Ts} \right)} \over s}$$
C
$$1$$
D
$${1 \over {\left[ {1 - \exp \left( { - Ts} \right)} \right]}}$$
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General Aptitude
Verbal Ability Logical Reasoning Numerical Ability
Network Theory
Network Elements State Equations For Networks Network Graphs Miscellaneous Sinusoidal Steady State Response Network Theorems Two Port Networks Transient Response
Microprocessors
Pin Details of 8085 and Interfacing with 8085 Instruction Set and Programming with 8085
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Discrete Fourier Transform and Fast Fourier Transform Discrete Time Signal Fourier Series Fourier Transform Continuous Time Signal Laplace Transform Fourier Transform Representation of Continuous Time Signal Fourier Series Transmission of Signal Through Continuous Time LTI Systems Miscellaneous Sampling Continuous Time Linear Invariant System Discrete Time Linear Time Invariant Systems Discrete Time Signal Z Transform Transmission of Signal Through Discrete Time Lti Systems
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Waveguides Miscellaneous Antennas Transmission Lines Uniform Plane Waves Maxwell Equations
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PN Junction Semiconductor Physics IC Basics and MOSFET BJT and FET
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Stability Frequency Response Analysis Compensators State Space Analysis Root Locus Diagram Signal Flow Graph and Block Diagram Time Response Analysis Basic of Control Systems
Communications
Fundamentals of Information Theory Noise In Digital Communication Digital Communication Systems Random Signals and Noise Analog Communication Systems
Engineering Mathematics
Probability and Statistics Linear Algebra Complex Variable Transform Theory Vector Calculus Differential Equations Calculus Numerical Methods
Analog Circuits
Oscillators Operational Amplifier 555 Timer Diodes FET and MOSFET Power Amplifier Frequency Response Bipolar Junction Transistor Feedback Amplifier
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