Question
What is frequency division multiplexing (FDM)?
Answer Options
- A) The transmitted signal jumps from band to band at a predetermined rate
- B) Dividing the transmitted signal into separate frequency bands that each carry a different data stream
- C) The transmitted signal is divided into packets of information
- D) Two or more information streams are merged into a digital combiner, which then pulse position modulates the transmitter
Correct Answer: B
Explanation
Multiplexing is a method that allows multiple distinct communication channels or data streams to be transmitted simultaneously over a single communications link (or single wide \text{RF} channel). This technique maximizes the use of the available bandwidth.
Frequency Division Multiplexing (\text{FDM}) achieves this by dividing the transmitted signal into separate frequency bands that each carry a different data stream. Essentially, a wide \text{RF} channel is sub-divided into multiple, narrower frequency sub-channels (like lanes on a highway). Each sub-channel carries its own data stream and is separated by guard bands to prevent adjacent channel interference.
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