Link Budget Error Control

Digital Communications Systems

This set of Digital Communication quiz focuses on “Link Budget Analysis and Error Control”.

1. Field of view is ______ to antenna gain.
a) Proportional
b) Inversely proportional
c) Half the
d) Double

2. Antenna gain ______ as effective area increases.
a) Increases
b) Decreases
c) Remains same
d) None of the mentioned

3. The beam-width becomes narrower on
a) Increasing frequency
b) Increasing antenna size
c) Increasing frequency & antenna size
d) None of the mentioned

4. Path loss Ls is dependent on
a) Signal power
b) Effective area
c) Wavelength
d) Antenna size

5. Thermal noise is generated due to
a) Lossy coupling
b) Lossless coupling
c) Lossy & Lossless coupling
d) None of the mentioned

6. In analog receivers, noise bandwidth is _________ signal bandwidth.
a) Lesser than
b) Greater than
c) Equal to
d) Not related

7. The link availability measures the percentage of time the link can be ______
a) Open
b) Closed
c) Used
d) None of the mentioned

8. Visibility is ________ to required availability.
a) Proportional
b) Inversely proportional
c) Equal
d) Not related

9. The stop and wait ARQ needs _______ connection.
a) Half duplex
b) Full duplex
c) Simplex
d) None of the mentioned

10. In continuous ARQ will pullback uses _____ system.
a) Half duplex
b) Full duplex
c) Simplex
d) None of the mentioned

11. Which method requires less redundancy?
a) Error detection
b) Error correction
c) Error detection & correction
d) None of the mentioned

12. Hybrid automatic repeat request is a combination of
a) ARQ and error correction code
b) ARQ and error detection code
c) Error detection and correction codes
d) One of the mentioned

13. Automatic repeat request is also called as
a) Forward error correction
b) Backward error correction
c) Forward & Backward error correction
d) None of the mentioned

14. Error detection is realized using
a) Hash function
b) Check sum
c) Hash function & Check sum
d) None of the mentioned
.

15. Check-sum scheme has
a) Check bits
b) Parity bits
c) Longitudinal redundancy bits
d) All of the mentioned

16. Example of block code is
a) Hamming code
b) Reed-solomon code
c) Repetition code
d) All of the mentioned

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