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Recent questions tagged digital-communications
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GATE ECE 2020 | Question: 12
A digital communication system transmits a block of $N$ bits. The probability of error in decoding a bit is $\alpha$. The error event of each bit is independent of the error events of the other bits. The received block is declared erroneous if at least one of its bits is decoded ... $\alpha ^{N}$ $1-\alpha ^{N}$ $1-\left ( 1-\alpha \right )^{N}$
go_editor
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Communications
Feb 13, 2020
by
go_editor
1.9k
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230
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gate2020-ec
digital-communications
communications
0
votes
0
answers
2
GATE ECE 2020 | Question: 48
In a digital communication system, a symbol $S$ randomly chosen from the set $\left \{ s_{1},s_{2},s_{3},s_{4} \right \}$ is transmitted. It is given that $s_{1}=-3,s_{2}=-1,s_{3}=+1$ and $s_{4}=+2$. The received ... decoding when the transmitted symbol $S=s_{i}$. The index $i$ for which the conditional symbol error probability $P_{i}$ is the highest is ___________.
go_editor
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in
Communications
Feb 13, 2020
by
go_editor
1.9k
points
49
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gate2020-ec
numerical-answers
digital-communications
communications
0
votes
0
answers
3
GATE ECE 2016 Set 3 | Question: 23
A binary baseband digital communication system employs the signal $p(t) = \begin{cases}\large\frac{1}{\sqrt T_s},&0\leq t\leq T_s \\ \: 0, & \text{otherwise} \end{cases}$ for transmission of bits. The graphical representation of the matched filter output $y(t)$ for this signal will be
Milicevic3306
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in
Communications
Mar 28, 2018
by
Milicevic3306
15.8k
points
70
views
gate2016-ec-3
digital-communications
communications
0
votes
0
answers
4
GATE ECE 2016 Set 2 | Question: 22
A speech signal is sampled at $8$ $kHz$ and encoded into $PCM$ format using $8$ bits/sample. The $PCM$ data is transmitted through a baseband channel via $4$-level $PAM$. The minimum bandwidth (in $kHz$) required for transmission is _________
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in
Communications
Mar 28, 2018
by
Milicevic3306
15.8k
points
42
views
gate2016-ec-2
numerical-answers
digital-communications
pulse-code-modulation-systems
communications
0
votes
0
answers
5
GATE ECE 2016 Set 1 | Question: 49
A digital communication system uses a repetition code for channel encoding/decoding. During transmission, each bit is repeated three times ($0$ is transmitted as $000$, and $1$ is transmitted as $111$). It is assumed that the source puts ... a $1$. Assuming a binary symmetric channel with crossover probability $p=0.1$, the average probability of error is _________
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in
Communications
Mar 28, 2018
by
Milicevic3306
15.8k
points
341
views
gate2016-ec-1
numerical-answers
digital-communications
communications
0
votes
0
answers
6
GATE ECE 2015 Set 2 | Question: 51
Consider a binary, digital communication system which uses pulses $g(t)$ and $-g(t)$ for transmitting bits over an AWGN channel. If the receiver uses a matched filter, which one of the following pulses will give the minimum probability of bit error?
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in
Communications
Mar 28, 2018
by
Milicevic3306
15.8k
points
71
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gate2015-ec-2
digital-communications
communications
0
votes
0
answers
7
GATE ECE 2014 Set 3 | Question: 19
A modulated signal is $y(t)= m(t)\cos(40000\pi t)$, where the baseband signal $m(t)$ has frequency components less than $5$ KHz only. The minimum required rate (in KHz) at which $y(t)$ should be sampled to recover $m(t)$ is _______.
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in
Communications
Mar 26, 2018
by
Milicevic3306
15.8k
points
77
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gate2014-ec-3
numerical-answers
digital-communications
communications
0
votes
0
answers
8
GATE ECE 2014 Set 3 | Question: 23
Consider an $FM$ signal $f(t)= \cos\left [ 2\pi f_{c} t+\beta _{1}\sin2\pi f_{1}t+\beta _{2}\sin2\pi f_{2}t\right ].$ The maximum deviation of the instantaneous frequency from the carrier frequency $f_{c}$ is $\beta _{1}f_{1}+\beta _{2}f_{2}$ $\beta _{1}f_{2}+\beta _{2}f_{1}$ $\beta _{1}+\beta _{2}$ $f _{1}+f _{2}$
Milicevic3306
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in
Communications
Mar 26, 2018
by
Milicevic3306
15.8k
points
59
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gate2014-ec-3
digital-communications
frequency-modulation
communications
0
votes
0
answers
9
GATE ECE 2014 Set 3 | Question: 51
In a $PCM$ system, the signal $m(t)=\left \{\sin(100\pi t)+\cos(100\pi t) \right \}V$ is sampled at the Nyquist rate. The samples are processed by a uniform quantizer with step size $0.75$ $V$. The minimum data rate of the $PCM$ system in bits per second is ______.
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asked
in
Communications
Mar 26, 2018
by
Milicevic3306
15.8k
points
79
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gate2014-ec-3
numerical-answers
digital-communications
pulse-code-modulation-systems
communications
0
votes
0
answers
10
GATE ECE 2013 | Question: 13
The bit rate of a digital communication system is $R$ kbits/s. The modulation used is $32$-QAM. The minimum bandwidth required for ISI free transmission is $R/10\: Hz$ $R/10\: kHz$ $R/5\: Hz$ $R/5\: kHz$
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Communications
Mar 26, 2018
by
Milicevic3306
15.8k
points
33
views
gate2013-ec
digital-communications
communications
0
votes
0
answers
11
GATE ECE 2017 Set 2 | Question: 23
A sinusoidal message signal is converted to a PCM signal using a uniform quantizer. The required signal-to-quantization 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 __________
admin
asked
in
Communications
Nov 23, 2017
by
admin
32.7k
points
382
views
gate2017-ec-2
digital-communications
numerical-answers
pulse-code-modulation
0
votes
0
answers
12
GATE ECE 2017 Set 1 | Question: 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 ... signal sample and a random signal is quantized The difference of message signal sample with its prediction is quantized
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asked
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Communications
Nov 17, 2017
by
admin
32.7k
points
1.1k
views
gate2017-ec-1
digital-communications
differential-pulse-code-modulation
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