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OFDMA System Analysis and DesignAnswers to RF Cafe Quiz #30 | ||||||
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| 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | | 29 | 30 | 31 | 32 | 33 | 34 | 35 | 36 | 37 | 38 | 39 | 40 | 41 | | 42 | 43 | 44 | 45 | 46 | 47 | 48 | All RF Cafe quizzes would make perfect 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. Some of these books used in quizzes are available as prizes in the monthly RF Cafe Giveaway. Note: Many answers contain passages quoted from the text.  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) | ||||||
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