FDM Core Principles Explained

FDM Core Principles Explained | Generated by AI

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Question Content

This question tests the concept of Frequency Division Multiplexing (FDM).

Key Information Extraction

Core elements in the question description:

In the frequency domain, divide the channel bandwidth
Divide into multiple sub-channels
Modulate signals onto carrier signals of corresponding sub-channels
Simultaneously transmit multiple signals on one channel

Comparison of All Options

Option	Name	Working Domain	Characteristics
A	Frequency Division Multiplexing (FDM)	Frequency Domain	Divides frequency into multiple sub-bands, each signal occupies different frequency
B	Time Division Multiplexing (TDM)	Time Domain	Divides time into multiple time slots, each signal occupies different time
C	Wavelength Division Multiplexing (WDM)	Optical Domain	Based on fiber optic transmission, different wavelength optical signals
D	Code Division Multiplexing (CDM)	Code Domain	Uses different encoding sequences to distinguish signals

Analysis of Your Answer

You selected C (Wavelength Division Multiplexing), which is incorrect.

Reasons:

WDM is primarily applied in fiber optic communication systems
The question explicitly states “divide in the frequency domain”, which directly indicates frequency division multiplexing
WDM is essentially the application of FDM in the optical domain, but the question asks about general channel multiplexing techniques

Correct Answer

✓ A Frequency Division Multiplexing (FDM)

Justification: The question completely describes the working principle of FDM: divide bandwidth in frequency domain → multiple sub-channels → modulate with different carriers → simultaneously transmit multiple signals

Learning Tip: Distinguishing the working domains of the four multiplexing techniques (frequency domain, time domain, code domain, optical domain) is the key to solving this type of question.

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