1) For fixed symbol rate, increase in bits/symbol ultimately improves rb/B bits/s/Hz & hence, regarded as _____.
a. Power efficiency
b. Spectral efficiency
c. Transmission efficiency
d. Modulation eficiency
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Answer
Explanation
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ANSWER: Spectral efficiency
Explanation:
No explanation is available for this question!
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2) For designing a communication system, which among the following parameters should be maximum?
A. Transmission rate
B. Received signal-to-noise ratio
C. Error probability
D. Bandwidth requirement
a. A & B
b. C & D
c. A & C
d. B & D
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Answer
Explanation
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ANSWER: A & B
Explanation:
No explanation is available for this question!
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3) For designing trellis code, the emphasis must be on maximizing __________
a. Euclidean distance between code vectors
b. Hamming distance of error correcting codes
c. Both a and b
d. None of the above
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Answer
Explanation
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ANSWER: Euclidean distance between code vectors
Explanation:
No explanation is available for this question!
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4) dfree is defined as the Euclidean distance of coded signal in terms of _________ possible distance between all allowed sequences.
a. smallest
b. largest
c. average
d. constant
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Answer
Explanation
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ANSWER: smallest
Explanation:
No explanation is available for this question!
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5) The distance between each symbol in given sequence and reference sequence is known as _______.
a. Euclidean Distance
b. Distance between sequences
c. Manmattan Distance
d. Hamming Distance
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Answer
Explanation
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ANSWER: Distance between sequences
Explanation:
No explanation is available for this question!
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6) In coding gain & bandwidth of TCM, if the signal energy is kept constant, the ________of constellation reduces the noise margin and results into the degradation of performance.
a. Expansion
b. Compression
c. Both a and b
d. None of the above
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Answer
Explanation
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ANSWER: Expansion
Explanation:
No explanation is available for this question!
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7) In digital communication system, if both power and bandwidth are limited, then which mechanism/choice is preferred?
a. Power efficient modulation
b. Bandwidth efficient modulation
c. Error control coding
d. Trellis coded modulation
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Answer
Explanation
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ANSWER: Error control coding
Explanation:
No explanation is available for this question!
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8) With respect to power-bandwidth trade-off, for reducing the transmit power requirement, the bandwidth needs to be ________.
a. Increased
b. Constant
c. Decreased
d. None of the above
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Answer
Explanation
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ANSWER: Increased
Explanation:
No explanation is available for this question!
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9) For a Gaussian channel of 1 MHz bandwidth with the signal power to noise spectral density ratio of about 104 Hz, what would be the maximum information rate?
a. 12000 bits/sec
b. 14400 bits/sec
c. 28000 bits/sec
d. 32500 bits/sec
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Answer
Explanation
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ANSWER: 14400 bits/sec
Explanation:
No explanation is available for this question!
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10) For a baseband system with transmission rate 'rs' symbols/sec, what would be the required bandwidth?
a. r s / 2 Hz
b. r s / 4 Hz
c. r s / 8 Hz
d. r s / 16 Hz
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Answer
Explanation
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ANSWER: rs / 4 Hz
Explanation:
No explanation is available for this question!
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