Howtosignalprocessing
It is the multiplexing technique which is used in analog system. In FDM, Guard band is required and the spectral efficiency of FDM is low.
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Orthogonal Frequency Division Multiplexing (OFDM):
| S.NO | FDM | OFDM |
|---|---|---|
| 3. | The spectral efficiency of FDM is low. | While the spectral efficiency of OFDM is high. |
- What are the major differences between TDM and FDM?
- Is FDM and FDMA are same?
- What is the main advantage of OFDM?
- Is OFDM modulation or multiplexing?
What are the major differences between TDM and FDM?
TDM and FDM are both multiplexing techniques. FDM is meant for analog signals, while TDM works well with both analog as well as digital signals. However, TDM is mostly used in digital communications only. In TDM, syncronization pulse is important; whereas in FDM, Guard Band is required.
Is FDM and FDMA are same?
Frequency-division multiplexing (FDM) is also distinct from FDMA. FDM is a physical layer technique that combines and transmits low-bandwidth channels through a high-bandwidth channel. FDMA, on the other hand, is an access method in the data link layer.
What is the main advantage of OFDM?
The main advantage of OFDM over single-carrier schemes is its ability to cope with severe channel conditions (for example, attenuation of high frequencies in a long copper wire, narrowband interference and frequency-selective fading due to multipath) without the need for complex equalization filters.
Is OFDM modulation or multiplexing?
Orthogonal Frequency Division Multiplexing (OFDM) is a digital multi-carrier modulation scheme that extends the concept of single subcarrier modulation by using multiple subcarriers within the same single channel.
