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Recent questions and answers in Communications
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1
GATE2017 EC2: 52
Consider a binary memoryless channel characterized by the transition probability diagram shown in the figure. The channel is lossless noiseless useless deterministic
asked
Nov 25, 2017
in
Communications
by
admin
(
2.8k
points)
gate2017ec2
informationtheory
communications
0
votes
0
answers
2
GATE2017 EC2: 51
A modulating signal given by $x(t)=5\sin (4\pi 10^3t 10\pi \cos 2\pi 10^3t)V$ is fed to a phase modulator with phase deviation constant $k_p=5$ rad/V. If the carrier frequency is $20$ kHz, the instantaneous frequency(in kHz) at $t=0.5$ ms is ____________
asked
Nov 25, 2017
in
Communications
by
admin
(
2.8k
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gate2017ec2
analogcommunications
numericalanswers
communications
0
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0
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3
GATE2017 EC2: 50
The unmodulated carrier power in an AM transmitter is $5$ kW. This carrier is modulated by a sinusoidal modulating signal. The maximum percentage of modulation is $50 \%$. If it is reduced to $40 \%$, then the maximum unmodulated carrier power (in kW) that can be used without overloading the transmitter is _________
asked
Nov 25, 2017
in
Communications
by
admin
(
2.8k
points)
gate2017ec2
ammodulation
numericalanswers
communications
0
votes
0
answers
4
GATE2017 EC2: 49
The signal $x(t)=\sin (14000\pi t)$, where $t$ is in seconds, is sampled at a rate of $9000$ samples per second. The sampled signal is the input to an ideal lowpass filter with frequency response $H(f)$ ... $= 7$ Number $= 3$, frequencies $= 2,7,11$ Number $= 2$, frequencies $= 2,7$ Number $= 2$, frequencies $= 7,11$
asked
Nov 25, 2017
in
Communications
by
admin
(
2.8k
points)
gate2017ec2
analogcommunication
lowpassfilters
0
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0
answers
5
GATE2017 EC2: 23
A sinusoidal message signal is converted to a PCM signal using a uniform quantizer. The required signaltoquantization noise ratio (SQNR) at the output of the quantizer is $40$ dB. The minimum number of bits per sample needed to achieve the desired SQNR is __________
asked
Nov 23, 2017
in
Communications
by
admin
(
2.8k
points)
gate2017ec2
digitalcommunications
numericalanswers
0
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0
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6
GATE2017 EC2: 21
Which one of the following graphs shows the Shannon capacity (channel capacity) in bits of a memoryless binary symmetric channel with crossover probability $p$ ?
asked
Nov 23, 2017
in
Communications
by
admin
(
2.8k
points)
gate2017ec2
channelcapacity
communications
0
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0
answers
7
GATE2017 EC1: 51
Let $X(t)$ be a wide sense stationary random process with the power spectral density $S_{X}(f)$ as shown in Figure (a), where $f$ is in Hertz$(Hz)$. The random process $X(t)$ ... Select the correct option: only I is true only II and III are true only I and II are true only I and III are true
asked
Nov 17, 2017
in
Communications
by
admin
(
2.8k
points)
gate2017ec1
spectraldensity
communications
0
votes
0
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8
GATE2017 EC1: 50
In binary frequency shift keying (FSK), the given signal waveforms are $u_{0}(t)=5\, \cos(20000\pi t)\, ;0\leq t\leq T \text{, and } \\ u_{1}(t)=5\, \cos(22000\pi t)\, ;0 \leq t \leq T,$ where $T$ is the bitduration interval and $t$ ... $T$ (in milliseconds) required to have $u_{0}(t)$ and $u_{1}(t)$ uncorrelated is $0.25$ ms $0.5$ ms $0.75$ ms $1.0$ ms
asked
Nov 17, 2017
in
Communications
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admin
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2.8k
points)
gate2017ec1
digitalcommunication
fsk
communications
0
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0
answers
9
GATE2017 EC1: 22
Which one of the following statements about differential pulse code modulation (DPCM) is true? The sum of message signal sample with its prediction is quantized The message signal sample is directly quantized, and its prediction is not used The ... of message signal sample and a random signal is quantized The difference of message signal sample with its prediction is quantized
asked
Nov 17, 2017
in
Communications
by
admin
(
2.8k
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gate2017ec1
digitalcommunications
modulation
0
votes
0
answers
10
GATE2017 EC1: 23
In a digital communication system, the overall pulse shape $p(t)$ at the receiver before the sampler has the Fourier transform $P(f)$. If the symbols are transmitted at the rate of $2000$ symbols per second, for which of the following cases is the inter symbol interference zero?
asked
Nov 17, 2017
in
Communications
by
admin
(
2.8k
points)
gate2017ec1
digitalcommunication
interference
0
votes
0
answers
11
GATE2017 EC1: 21
Let $\left ( X_{1},X_{2} \right )$ be independent random variables. $\left ( X_{1} \right )$ has mean $0$ and variance $1$, while $\left ( X_{2} \right )$ has mean $1$ and variance $4$. The mutual information $I\left (X_{1},X_{2} \right )$ between $X1$ and $X2$ in bits is_______.
asked
Nov 17, 2017
in
Communications
by
admin
(
2.8k
points)
gate2017ec1
informationtheory
mutualinformation
numericalanswers
communications
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