Communications [GATE (Graduate Aptitude Test in Engineering) Electronics]: Questions 100 - 102 of 106

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Question 100

Communications
Fundamentals of Error Correction, Hamming Codes

Appeared in Year: 2021

Question

MCQ▾

A digital transmission system uses a (7,4) systematic linear Hamming code for transmitting data over a noisy channel. If three of the message codeword pairs in this code where ci is the codeword corresponding to the ith message , are known to be (1100; 0101100) , (1110; 0022220) and (0110; 1000110) , then which of the following is a valid codeword in this code?

Choices

Choice (4)Response

a.

0110100

b.

0001011

c.

1011010

d.

1101001

Question 101

Communications
Autocorrelation and Power Spectral Density

Appeared in Year: 2020

Question

Numeric Answer▾

The random variable Where and W (t) is a real white Gaussian noise process with two-sided power spectral density W/Hz, for all f. The variance of Y is

The random variable

Where

And W (t) is a real white Gaussian noise process with two-sided power spectral density SW (f) = 3 W/Hz, for all f. The variance of Y is

Question 102

Communications
Angle Modulation and Demodulation

Appeared in Year: 2021

Question

Numeric Answer▾

A sinusoidal message signal having root mean square value of 4 V and frequency of 1 kHz is fed to a phase modulator with phase deviation constant 2 rad/volt. If the carrier signal is , the maximum instantaneous frequency of the phase modulated signal (rounded off to one decimal place) is ________ Hz.

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