Digital Communications Multiple Choice Questions on “Acquisition and Tracking”.
1. Acquisition is a process of bringing two spreading signals into _______ alignment.
A. Fine
B. Coarse
C. Fine & Coarse
D. None of the mentioned
Answer: B
Clarification: Acquisition is a process of bringing two spreading signals into coarse alignment with one another.
2. Tracking maintains the possible waveform ______ alignment using a feedback loop.
A. Fine
B. Coarse
C. Fine & Coarse
D. None of the mentioned
Answer: A
Clarification: Tracking continuously maintains the best possible waveform fine alignment by means of a feedback loop.
3. Acquisition can be of ______ type.
A. Coherent
B. Non coherent
C. Coherent & Non coherent
D. None of the mentioned
Answer: C
Clarification: Acquisition can be categorized as two types coherent and non coherent.
4. Uncertainty in the distance between transmitter and receiver translates into uncertainty in
A. Frequency
B. Propagation delay
C. Efficiency
D. None of the mentioned
Answer: B
Clarification: uncertainty in the distance between the transmitter and the receiver translates into uncertainty in the propagation delay.
5. Acquisition uses ______ likelihood algorithm for acquiring the code.
A. Minimum
B. Maximum
C. Minimum & Maximum
D. None of the mentioned
Answer: B
Clarification: It considers all possible code positions in parallel and maximum likelihood algorithm is used to acquire the code.
6. Acquisition can be accomplished ________ as all possible codes are examined ______
A. Slowly, one by one
B. Rapidly, simultaneously
C. Slowly, simultaneously
D. Rapidly, one by one
Answer: B
Clarification: Acquisition can be accomplished rapidly as all possible codes are examined simultaneously.
7. Matched filter does ______ search.
A. Serial
B. Parallel
C. Serial & Parallel
D. None of the mentioned
Answer: A
Clarification: A single correlator or matched filter does serial search.
8. How many correlators are used for despreading and code tracking function?
A. One
B. Two
C. Three
D. None of the mentioned
Answer: A
Clarification: The design of code tracking function or despreading function needs only one correlator.
9. Which has worse signal to noise performance?
A. Delay locked loop
B. Tau-dither loop
C. Delay locked & Tau-dither loop
D. None of the mentioned
Answer: B
Clarification: The signal to noise performance of TDL is a bit worse than DDL.
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