Question 51 : Which is easier to implement and is preferred?
1. Coherent system
2. Non coherent system
3. Coherent & Non coherent system
4. None of the mentioned
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Question 52 : Coherent PSK and non coherent orthogonal FSK have a difference of ______ in PB.
1. 1db
2. 3db
3. 4db
4. 6db
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Question 53 : The impulse response of the filter is the ________ of the mirror image of the signal waveform.
1. Delayed version
2. Same version
3. Delayed & Same version
4. None of the mentioned
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Question 54 : Preamble is used for
1. Detect start of transmission
2. To set automatic gain control
3. To align internal clocks
4. All of the mentioned
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Question 55 : For AWGN, the noise variance is
1. N0
2. N0/2
3. 2N0
4. N0/4
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Question 56 : The average noise power of white noise is
1. 0
2. Infinity
3. 1
4. None of the mentioned
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Question 57 : Channels display multi-path due to
1. Scattering
2. Time delayed reflections
3. Diffraction
4. All of the mentioned
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Question 58 : Examples of nyquist filters are
1. Root raised cosine filter
2. Raised cosine filter
3. Root raised & Raised cosine filter
4. None of the mentioned
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