Digital Communications

Noise

Question 1
Marks : +2 | -2
Pass Ratio : 100%
SQNR can be improved by _______ sampling rate.
Increasing
Decreasing
Does not depend
None of the mentioned
Explanation:
SQNR can be improved by increasing the sampling rate.
Question 2
Marks : +2 | -2
Pass Ratio : 100%
Two functions are called as orthogonal if on integrating the product we get
One
Zero
Infinity
None of the mentioned
Explanation:
Two functions are called as orthogonal if the integral value of integrating the product is zero.
Question 3
Marks : +2 | -2
Pass Ratio : 100%
Which noise is useful for dithering?
White noise
Pink noise
Brown noise
None of the mentioned
Explanation:
Brown noise is sometimes useful for dithering.
Question 4
Marks : +2 | -2
Pass Ratio : 100%
Capacity of a channel can be increased by
Increasing channel bandwidth
Increasing signal power
Increasing channel bandwidth &signal power
None of the mentioned
Explanation:
Capacity of a channel can be increased by increasing channel bandwidth and also by increasing signal power.
Question 5
Marks : +2 | -2
Pass Ratio : 100%
Matched filtering operation includes
Spectral phase matching
Spectral amplitude matching
Spectral phase & amplitude matching
None of the mentioned
Explanation:
Matched filtering includes two operations – spectral amplitude matching and spectral phase matching.
Question 6
Marks : +2 | -2
Pass Ratio : 100%
Capacity of the channel can be increased by reducing in band noise power.
True
False
Explanation:
Capacity of a channel can be increased by reducing the in band noise power.
Question 7
Marks : +2 | -2
Pass Ratio : 100%
Thermal noise is a wide sense stationary process.
True
False
Explanation:
Thermal noise is modeled as a wide sense stationary stochastic process.
Question 8
Marks : +2 | -2
Pass Ratio : 100%
Shot noise is
Stochastic process
Poisson process
Stochastic & Poisson process
None of the mentioned
Explanation:
Shot noise is a Poisson process.
Question 9
Marks : +2 | -2
Pass Ratio : 100%
Shot noise is avoidable when current is
Zero
One
Infinity
None of the mentioned
Explanation:
Shot noise is avoidable only when the current is zero.
Question 10
Marks : +2 | -2
Pass Ratio : 100%
Which consists of less ISI?
Nyquist filter
Raised cosine filter
Nyquist & Raised cosine filter
None of the mentioned
Explanation:
Raised cosine filter results in less ISI than Nyquist filter.