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OFDMA System Analysis and Design
RF Cafe Quiz #30

RF Engineering Quizzes - RF Cafe WebsiteAll 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. Good luck!

A complete list of RF Cafe Quizzes.

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.

 

1.  Which of these are advantages of Frequency Division Multiplexing (FDM)?

a)  Effective at combating intersymbol interference (ISI) and multipath fading

b)  Can adjust modulation and coding for each subcarrier

c)  Simple equalization

d)  All the above

 

2.  Which transmission scheme has the highest spectral efficiency?

a)  Frequency Division Multiplexing (FDM)

b)  Orthogonal Frequency Division Multiplexing (OFDM)

c)  Orthogonal Frequency Division Multiple Access (OFDMA)

d)  Uber Orthogonal Frequency Division Multiple Access (UOFDMA)

 

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

 

4.  What are "linear block codes" in channel coding lingo?

a)  A class of codes used for error detection or correction

b)  Linear coding techniques that divide cells into city blocks

c)  Coding schemes using a building block construction analogy

d)  None of the above

 

5.  How does a high peak-to-average power ratio (PAPR) affect OFDM systems?

a)  Not at all

b)  Minimally

c)  Significantly

d)  OFDM cannot be used with a high PAPR

 

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

b)  The actual cable or wireless link interconnecting the transmitter and receiver

c)  Another name for the hardware

d)  Another name for the MAC (Medium Access Control)

 

7.  What is "receive diversity?"

a)  Having a receiver capable of operating in a "bit-blind" manner

b)  Using all arriving bits regardless of signal quality

c)  Giving preference to "0s" over "1s" out of fairness

d)  Dynamically selecting the best signal from multiple antennas

 

8.  Which of the following are real names given to scheduling algorithms?

a)  Round robin

b)  Temporary removal scheduler

c)  Proportional fairness

d)  All the above

 

9.  During a cell scanning interval, which neighboring station "association level" refers to

     Network-Assisted Association Reporting?

a)  Association Level 0

b)  Association Level 1

c)  Association Level 2

d)  Association Level 3

 

10.  What is a cryptographic "hash?"

a)  Masking noise

b)  A function that returns a fixed-size bit string from a variably-sized input string

c)  An algorithm that chops up messages to disguise them

d)  Playful bantering between coders

Need some help? Click here for the answers and explanations.

Quizzes from vintage electronics magazines (and many custom RF Cafe-generated quizzes) 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
Amplifier Solutions Corporation (ASC) - RF Cafe Website

About the RF Cafe™ Website ©1996-2026

Kirt Blattenberger - RF Cafe WebmasterRF 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...

Webmaster: Kirt Blattenberger  |     BSEE - KB3UON - AMA92498  |  USAF Radar Technician

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