Communications [GATE (Graduate Aptitude Test in Engineering) Electronics]: Questions 54 - 59 of 106

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Passage

Consider a baseband binary PAM receiver shown below. The additive channel noise is with power spectral density . The low-pass filter is ideal with unity gain and cut-off frequency . Let represent the random variable .

, if transmitted bit

, if transmitted bit

Where, represents the noise sample value. The noise sample has a probability density function,

(This has mean zero and variance ) .

Assume transmitted bits to be equiprobable and threshold is set to .

A Baseband Binary PAM Receiver

Question 54 (1 of 2 Based on Passage)

Communications
SNR and BER for Digital Modulation

Appeared in Year: 2010

Question

MCQ▾

The probability of bit error is

Choices

Choice (4)Response

a.

b.

c.

d.

Question 55 (2 of 2 Based on Passage)

Communications
Matched Filter Receiver

Appeared in Year: 2010

Question

MCQ▾

The value of the parameter α (in ) is

Choices

Choice (4)Response

a.

b.

c.

d.

Question 56

Communications
Amplitude Modulation and Demodulation

Appeared in Year: 2010

Question

MCQ▾

The Nyquist sampling rate for the signal s (t) = is given by

Choices

Choice (4)Response

a.

b.

c.

d.

Question 57

Communications
Angle Modulation and Demodulation

Appeared in Year: 2010

Question

MCQ▾

Consider an angle modulated signal . The average power of is

Choices

Choice (4)Response

a.

b.

c.

d.

Question 58

Communications
Fundamentals of Error Correction, Hamming Codes

Appeared in Year: 2019

Question

MCQ▾

A linear Hamming code is used to map 4-bit messages to 7-bit code words. The encoder mapping is linear. If the message 0001 is mapped to the code word , and the message is mapped to the code word , then the message is mapped to

(Carry One Mark Each)

Choices

Choice (4)Response

a.

b.

c.

d.

1111111

Question 59

Communications
PCM, DPCM, Digital Modulation Schemes

Appeared in Year: 2019

Question

MCQ▾

A single bit, equally likely to be 0 and 1, is to be sent across an additive white Gaussian noise (AWGN) channel with power spectral density . Binary signaling, with and , is used for the transmission, along with an optimal receiver that minimizes the bit-error probability. Let and form and orthonormal signal set. If we choose ) , we would obtain a certain bit-error probability Pb. If we keep , but take , for what value of E would we obtain the same bit-error probability Pb? (Carry One Mark Each)

Choices

Choice (4)Response

a.

1

b.

2

c.

3

d.

0

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