1) Packet radio refers to
a. Multiple users on single channel
b. Single user on multiple channels as per demand
c. Multiple users on multiple channels at different time slots
d. Multiple users with coding techniques
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Answer
Explanation
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ANSWER: Multiple users on single channel
Explanation:
No explanation is available for this question!
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2) In voice excited vocoders, PCM transmission helps in transmission of
a. High frequency bands of speech
b. Low frequency bands of speech
c. Multiplexed signals
d. Modulated signals
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Answer
Explanation
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ANSWER: Low frequency bands of speech
Explanation:
No explanation is available for this question!
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3) The increased capacity of SDMA is due to
a. Focused signal transmitted into narrow transmission beams
b. Smart antennas pointing towards mobile stations
c. Use of different frequencies at same time slot
d. Both a and b are correct
e. Both a and c are correct
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Answer
Explanation
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ANSWER: Both a and b are correct
Explanation:
No explanation is available for this question!
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4) The advantage of using SDMA over other spread spectrum technique is
a. Mobile station battery consumption is low
b. Reduced spectral efficiency
c. Increased spectral efficiency
d. Both a and b are correct
e. Both a and c are correct
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Answer
Explanation
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ANSWER: Both a and c are correct
Explanation:
No explanation is available for this question!
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5) SDMA technique employs
a. Smart antenna technology
b. Use of spatial locations of mobile units within the cell
c. More battery consumption
d. Both a and b are correct
e. Both b and c are correct
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Answer
Explanation
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ANSWER: Both a and b are correct
Explanation:
No explanation is available for this question!
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6) The increase in number of users in PURE ALOHA causes
a. Increase in delay
b. Increase in probability of collision
c. Increase in spectrum
d. Both a and b
e. Both a and c
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Answer
Explanation
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ANSWER: Both a and b
Explanation:
No explanation is available for this question!
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7) Pure ALOHA is a
a. Random access protocol
b. Scheduled access protocol
c. Hybrid access protocol
d. Demand access protocol
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Answer
Explanation
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ANSWER: Random access protocol
Explanation:
No explanation is available for this question!
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8) Disadvantages of packet radio are
a. Induced delays
b. Low spectral efficiency
c. Large spectrum required
d. Both a and b
e. Both b and c
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Answer
Explanation
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ANSWER: Both a and b
Explanation:
No explanation is available for this question!
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9) The guard interval is provided in OFDM
a. To eliminate the need of pulse shaping filter
b. To eliminate ISI
c. High symbol rate
d. Both a and b
e. Both b and c
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Answer
Explanation
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ANSWER: Both a and b
Explanation:
No explanation is available for this question!
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10) The troubles that OFDM faces over other spread spectrum techniques are
1. Sensitivity to Doppler shift
2. Frequency synchronization problems
3. Time synchronization problems
4. Low efficiency due to guard intervals
a. 1, 2 and 3 are correct
b. 2 and 3 are correct
c. 1, 2 and 4 are correct
d. All the four are correct
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Answer
Explanation
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ANSWER: 1, 2 and 4 are correct
Explanation:
No explanation is available for this question!
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