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Answers to RF Cafe Quiz #30
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RF Engineering Quizzes - RF CafeAll 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!

Click here for the complete list of RF Cafe Quizzes.

Note: Some material based on books have quoted passages.

Return to RF Cafe Quiz #30

RF Cafe - OFDMA System Analysis and Design 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)

Quizzes from vintage electronics magazines such as Popular Electronics, Electronics-World, QST, Radio-Electronics, and Radio News were published over the years - some really simple and others not so simple. Robert P. Balin created most of the quizzes for Popular Electronics. This is a listing of all I have posted thus far.

RF Cafe Quizzes

Vintage Electronics Magazine Quizzes

Vintage Electronics Magazine Quizzes
Anatech Electronics RF & Microwave Filters - RF Cafe

Kirt Blattenberger - RF Cafe Webmaster

Copyright: 1996 - 2026
Webmaster: Kirt Blattenberger
   BSEE - KB3UON - AMA92498
   USAF Radar Technician

About RF Cafe

RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while tying up your telephone line, and a lady's voice announced "You've Got Mail" when a new message arrived...

Copyright  1996 - 2026

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