 All RF Cafe Quizzes make great fodder for
employment interviews for technicians or engineers - particularly those who are
fresh out of school or are relatively new to the work world. Come to think of it,
they would make equally excellent study material for the same persons who are going
to be interviewed for a job. Bonne chance, Viel Glück, がんばろう,
buena suerte, удачи, in bocca al lupo, 행운을 빕니다,
ádh mór, בהצלחה, lykke til, 祝你好運.
Well, you know what I mean: Good luck!
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Quiz #30
 This
quiz is based on the information presented in OFDMA System Analysis and Design, by Samuel C. Young. Published by
Artech House. Note: Some of these books are available as prizes in the
monthly
RF Cafe Giveaway.
1. Which of these are advantages of Frequency Division Multiplexing (FDM)? d) All
the above (see page 5) 2. Which transmission scheme has the highest spectral
efficiency? c) Orthogonal Frequency Division Multiplexing (OFDMA) (see page 13... I made up answer d)
3. In multi-path signal computations, what is the "plane-earth" model? a) A model used for
airborne system calculations b) A model that considers the earth surface to be flat c) c) A model that
neglects obstacles, i.e., "plane" d) All the above
b) A model that considers the earth surface to be flat (see page 20) 4. What
are "linear block codes" in channel coding lingo? a) A class of codes used for error detection or
correction (see page 47) 5. How does a high peak-to-average power ratio (PAPR)
affect OFDM systems? c) Significantly (see page 93) 6. What is the
"physical layer" of a protocol? a) It is the code (software/firmware) responsible for the actual
transmission of bits across the medium (see page 97) 7. What is "receive
diversity?" d) Dynamically selecting the best signal from multiple antennas (see page 122)
8. Which of the following are real names given to scheduling algorithms? d) All the above (see
page 155) 9. During a cell scanning interval, which neighboring station
"association level" refers to Network-Assisted Association Reporting? c) Association Level 2 (see
page 178) 10. What is a cryptographic "hash?" b) A function that returns
a fixed-size bit string from a variably-sized input string (see page 216) |
