Orthogonal Frequency Division Multiple Access (OFDMA) MCQ’s

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This set of Wireless & Mobile Communications Multiple Choice Questions & Answers (MCQs) focuses on “Orthogonal Frequency Division Multiple Access (OFDMA)”.

1. Why is a cyclic prefix required in an OFDMA?
a) To ensure symbol time is an integer number
b) To help overcome multipath and ISI
c) To maintain orthogonality
d) To make OFDMA scalable

2. What does the DC subcarrier indicate?
a) Identity of the cell
b) Antenna configuration
c) Center of OFDM channel
d) Format of data channel

3. OFDMA stands for ________
a) omnidirectional frequency division multiple access
b) orthogonal frequency duplex multiple access
c) orthogonal frequency divider multiple access
d) orthogonal frequency division multiple access

4. What processing step combines multiple OFDM subcarriers into a single signal for transmission?
a) FFT
b) IFFT
c) RF combining
d) Channel mapping

5. In OFDMA, what is the relationship between the subcarrier spacing f and symbol time t?
a) f=t
b) f=1/2t
c) f=1/t
d) no relation

6. Which property of OFDMA system allows adjacent subcarriers to be used without interference?
a) Orthogonality
b) Orthodoxy
c) Octagonality
d) Originality

7. OFDM is a technique for 3G mobile communication.
a) True
b) False

8. When we divide band of Orthogonal Frequency Division Multiplexing (OFDM) into sub bands, it diminishes effects of __________
a) noise
b) collision
c) interference
d) signals absence

9. OFDM uses complex equalizers.
a) True
b) False

10. Common data rates of IEEE 802.11 OFDM are ____________
a) 18 Mbps
b) 200 Mbps
c) 50 Mbps
d) 54 Mbps

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