Question
Orthogonal frequency-division multiplexing (OFDM) is a technique used for which types of amateur communication?
Answer Options
- A) Digital modes
- B) Extremely low-power contacts
- C) EME
- D) OFDM signals are not allowed on amateur bands
Correct Answer: A
Explanation
Orthogonal Frequency-Division Multiplexing (\text{OFDM}) is an advanced digital modulation scheme used in high-speed commercial data systems (like Wi-Fi, 4\text{G/5G}, and digital TV). It is a complex but highly robust and spectrally efficient technique, especially in multipath environments.
\text{OFDM} is used for digital modes in amateur communication where high data throughput and robustness against fading are needed. For example, it is used in digital television (DVB-T) and some high-speed amateur radio mesh networking systems, particularly those operating in the \text{UHF} and microwave bands.
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