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National Champion Test EC: Digital Communication
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Question 1
Converting an analog signal to digital signal is done by Sampling and
Question 2
In synchronous TDM, there are four inputs and data rate of each input connection is 3 kbps. If 1 bit at a time is multiplexed, what is the duration of each frame ?
Question 3
Consider a random process given by: x(t) = Acos(2πfc+θ)where A is a Rayleigh distributed random variable and θ is uniformly distributed in [0, 2π]. A and θ are independent. For any time t, the probability density function (PDF) of x(t) is:
Question 4
Consider the following statements:
If the maximum range of radar has to be doubled
1) the peak transmitted power may be increased 16 folds
2) the antenna diameter may be doubled
3) the sensitivity of receiver may be doubled
4) the transmitted pulse width may be doubled
Which of the above statements are correct?
If the maximum range of radar has to be doubled
1) the peak transmitted power may be increased 16 folds
2) the antenna diameter may be doubled
3) the sensitivity of receiver may be doubled
4) the transmitted pulse width may be doubled
Which of the above statements are correct?
Question 5
A signal occupies a band 5 kHz to 10 kHz. For proper error free reconstruction at what rate it should be sampled?
Question 6
Consider the following codes:
1). Hamming code
2). Huffman code
3). Shannon-Fano code
4). Convolution code
Which of these are source codes?
1). Hamming code
2). Huffman code
3). Shannon-Fano code
4). Convolution code
Which of these are source codes?
Question 7
The outputs of two noise sources each producing uniformly distributed noise over the range –a of +a are added. What is the p. d. f. of the added noise?
Question 8
The probability cumulative distribution function must be monotone and
Question 9
What is the main objective of trellis coding?
Question 10
If the ASCII character H is sent and the character I is received, what type of error is represented?
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Feb 26ESE & GATE EC