FDM Core Principles Explained | Generated by AI
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.