Which multiplexing technique allows multiple signals to be transferred in what appears to be simultaneous subchannels within a single communication channel?

Which multiplexing technique allows multiple signals to be transferred in what appears to be simultaneous subchannels within a single communication channel?

• A. Frequency-division multiplexing
• B. Time-division multiplexing
• C. Wavelength-division multiplexing
• D. Code-division multiplexing

Answer: (B)

The technique described is frequency-division multiplexing. It works by splitting the available bandwidth of a single channel into multiple non-overlapping frequency sub-bands, with each sub-band carrying its own signal. Because these signals occupy different frequencies at the same time, they can be transmitted simultaneously over the same channel and later separated at the receiver with filters. This differs from time-division multiplexing, where signals share the same frequency but are sent in separate time slots, so they’re not truly simultaneous. Wavelength-division multiplexing is similar in concept to frequency-division but uses different light wavelengths in optical fibers, while code-division multiplexing separates signals by unique codes rather than frequency or time. Hence, the scenario described aligns with frequency-division multiplexing.

The technique described is frequency-division multiplexing. It works by splitting the available bandwidth of a single channel into multiple non-overlapping frequency sub-bands, with each sub-band carrying its own signal. Because these signals occupy different frequencies at the same time, they can be transmitted simultaneously over the same channel and later separated at the receiver with filters.

This differs from time-division multiplexing, where signals share the same frequency but are sent in separate time slots, so they’re not truly simultaneous. Wavelength-division multiplexing is similar in concept to frequency-division but uses different light wavelengths in optical fibers, while code-division multiplexing separates signals by unique codes rather than frequency or time. Hence, the scenario described aligns with frequency-division multiplexing.