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Recent questions tagged digitalcommunications
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GATE2020EC: 12
A digital communication system transmits a block of $\text{N}$ 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 wrongly. ... $\alpha ^{N}$ $1\alpha ^{N}$ $1\left ( 1\alpha \right )^{N}$
asked
Feb 13
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by
jothee
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1.4k
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gate2020ec
probability
digitalcommunications
0
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0
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2
GATE2020EC: 48
In a digital communication system, a symbol $\text{S}$ 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 symbol ... when the transmitted symbol $S=s_{i}$. The index $\text{i}$ for which the conditional symbol error probability $P_{i}$ is the highest is ___________.
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Feb 13
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by
jothee
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1.4k
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gate2020ec
numericalanswers
digitalcommunications
0
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0
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3
GATE2016323
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
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Mar 28, 2018
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by
Milicevic3306
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15.7k
points)
gate2016ec3
digitalcommunications
0
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0
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4
GATE2016222
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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Mar 28, 2018
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by
Milicevic3306
(
15.7k
points)
gate2016ec2
numericalanswers
digitalcommunications
pcmsystems
0
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0
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5
GATE2016149
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 out symbols ... of a $1$. Assuming a binary symmetric channel with crossover probability $p=0.1$, the average probability of error is _________
asked
Mar 28, 2018
in
Others
by
Milicevic3306
(
15.7k
points)
gate2016ec1
numericalanswers
digitalcommunications
0
votes
0
answers
6
GATE2015251
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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Mar 28, 2018
in
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by
Milicevic3306
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15.7k
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gate2015ec2
digitalcommunications
0
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0
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7
GATE2014319
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 _______.
asked
Mar 26, 2018
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by
Milicevic3306
(
15.7k
points)
gate2014ec3
numericalanswers
digitalcommunications
0
votes
0
answers
8
GATE2014323
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 $\beta _{1}f_{1}+\beta _{2}f_{2}$ $\beta _{1}f_{2}+\beta _{2}f_{1}$ $\beta _{1}+\beta _{2}$ $f _{1}+f _{2}$
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Mar 26, 2018
in
Others
by
Milicevic3306
(
15.7k
points)
gate2014ec3
digitalcommunications
fmsignals
0
votes
0
answers
9
GATE2014350
A real bandlimited random process $X(t)$ has twosided power spectral density $S_{X}(f)= \begin{cases} 10^{6} (3000\mid f \mid) \text{Watts/Hz} & \text{for } \mid f \mid \leq 3 kHz \\ 0 & \text{otherwise} \end{cases}$ where $f$ ... ideal bandpass filter of unity gain with centre frequency of $8$ $kHz$ and bandwidth of $2$ kHz. The output power (in Watts) is ___________.
asked
Mar 26, 2018
in
Others
by
Milicevic3306
(
15.7k
points)
gate2014ec3
numericalanswers
digitalcommunications
bandpassfilter
0
votes
0
answers
10
GATE2014351
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 ______.
asked
Mar 26, 2018
in
Others
by
Milicevic3306
(
15.7k
points)
gate2014ec3
numericalanswers
digitalcommunications
pcmsystems
0
votes
0
answers
11
GATE201313
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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Mar 26, 2018
in
Others
by
Milicevic3306
(
15.7k
points)
gate2013ec
digitalcommunications
0
votes
0
answers
12
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
votes
0
answers
13
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
points)
gate2017ec1
digitalcommunications
modulation
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