GATE ECE 1989 | Digital Communication Systems Question 56 | Communications

GATE ECE 1989

MCQ (More than One Correct Answer)

-0.6

In binary data transmission DPSK is preferred to PSK because

a coherent carrier is not required to be generated at the receiver.

for a given energy per bit, the probability of error is less.

the 180⁰ phase shifts of the carrier are unimportant.

more protection is provided against impulse noise.

GATE ECE 1988

MCQ (Single Correct Answer)

-0.6

The transfer function of a zero - order hold is

$${{1 - \exp \left( { - Ts} \right)} \over s}$$

$$1$$

$${1 \over {\left[ {1 - \exp \left( { - Ts} \right)} \right]}}$$

GATE ECE 1988

MCQ (Single Correct Answer)

-0.6

The message bit sequence input to a DPSK modulator is 1, 1, 0, 0, 1, 1. The carrier phase during the reception of the first two message bits is $$\pi ,\,\,\pi $$. The carrier phase for the remaining four message bits is

$$\pi $$, $$\pi $$, 0, $$\pi $$

0, 0, $$\pi $$, $$\pi $$

0, $$\pi $$, $$\pi $$, $$\pi $$

$$\pi $$, $$\pi $$, 0, 0

GATE ECE Subjects

Signals and Systems

Representation of Continuous Time Signal Fourier Series Discrete Time Signal Fourier Series Fourier Transform Discrete Time Signal Z Transform Continuous Time Linear Invariant System Transmission of Signal Through Continuous Time LTI Systems Discrete Time Linear Time Invariant Systems Sampling Continuous Time Signal Laplace Transform Discrete Fourier Transform and Fast Fourier Transform Transmission of Signal Through Discrete Time Lti Systems Miscellaneous Fourier Transform

Network Theory

State Equations For Networks Network Elements Network Theorems Two Port Networks Transient Response Sinusoidal Steady State Response Network Graphs Miscellaneous

Control Systems

Signal Flow Graph and Block Diagram Time Response Analysis Compensators Basic of Control Systems Frequency Response Analysis Stability Root Locus Diagram State Space Analysis

Digital Circuits

Logic Gates Boolean Algebra Analog to Digital and Digital to Analog Converters Sequential Circuits Combinational Circuits Logic Families Number System and Code Convertions Semiconductor Memories

General Aptitude

Numerical Ability Verbal Ability

Electronic Devices and VLSI

PN Junction Semiconductor Physics IC Basics and MOSFET BJT and FET

Analog Circuits

Bipolar Junction Transistor FET and MOSFET Oscillators Operational Amplifier 555 Timer Frequency Response Diodes Feedback Amplifier Power Amplifier

Engineering Mathematics

Linear Algebra Calculus Vector Calculus Complex Variable Probability and Statistics Differential Equations Numerical Methods Transform Theory

Microprocessors

Instruction Set and Programming with 8085 Pin Details of 8085 and Interfacing with 8085

Communications

Fundamentals of Information Theory Noise In Digital Communication Analog Communication Systems Digital Communication Systems Random Signals and Noise

Electromagnetics

Waveguides Antennas Miscellaneous Transmission Lines Maxwell Equations Uniform Plane Waves