1
GATE ECE 2007
MCQ (Single Correct Answer)
+2
-0.6
The raised cosine pulse p(t) is used for zero ISI in digital communications. The expression for p(t) with unity roll-off factor is given by $$$p(t) = {{\sin \,4\,\pi \,W\,t} \over \matrix{
4\,\pi \,W\,t(1 - 16{W^2}{t^2}) \hfill \cr
\hfill \cr
\hfill \cr} }$$$
The value of p(t) at $$t = {1 \over {4\,W}}$$ is
2
GATE ECE 2007
MCQ (Single Correct Answer)
+2
-0.6
In a Direct sequence CDMA system the chip rate is $$1.2288\,\, \times \,\,{10^6}$$ chips per second. If the processing gain is desired to be at least 100. The data rate
3
GATE ECE 2006
MCQ (Single Correct Answer)
+2
-0.6
The minimum step-size required for a Delta-Modulator operating at 32 K samples/sec to track the signal (here u(t) is the unit-step function)
x(t) = 125t(u(t) - u (t - 1) + (250 - 125t) (u (t - 1) - u (t - 2 )) so that slope - overload is avoided, would be
4
GATE ECE 2004
MCQ (Single Correct Answer)
+2
-0.6
Three analog signals, having bandwidths 1200 Hz, 600 Hz and 600 Hz are sampled at their respective Nyquist rates, enocodes with 12 bit words, and time division multiplexed. The bit rate for the multiplexed signal is
Questions Asked from Digital Communication Systems (Marks 2)
Number in Brackets after Paper Indicates No. of Questions
GATE ECE 2017 Set 1 (1)
GATE ECE 2016 Set 2 (1)
GATE ECE 2016 Set 3 (1)
GATE ECE 2015 Set 1 (2)
GATE ECE 2014 Set 4 (1)
GATE ECE 2014 Set 3 (2)
GATE ECE 2014 Set 2 (1)
GATE ECE 2008 (4)
GATE ECE 2007 (4)
GATE ECE 2006 (1)
GATE ECE 2004 (3)
GATE ECE 2003 (3)
GATE ECE 2000 (1)
GATE ECE 1999 (1)
GATE ECE 1996 (1)
GATE ECE 1992 (3)
GATE ECE 1991 (1)
GATE ECE 1990 (1)
GATE ECE 1989 (1)
GATE ECE 1988 (2)
GATE ECE Subjects
Network Theory
Control Systems
Electronic Devices and VLSI
Analog Circuits
Digital Circuits
Microprocessors
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
Communications
Electromagnetics
General Aptitude