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 is the difference between FDM and OFDM signal?
- Why is OFDMA better than OFDM?
- What are the differences between OFDMA and SC-FDMA?
- What is the main difference between FDM and TDM?
What is the difference between FDM and OFDM signal?
The radio frequency receiver is simpler in OFDM because the entire signal can be received in a single frequency selective filter and separated in software using a fast Fourier transform, while an FDM system requires a separate RF bandpass filter for each channel. It also has better overall bandwidth efficiency.
Why is OFDMA better than OFDM?
The difference is that OFDMA is multi-user where OFDM is single-user. It has 3x higher throughput than single-user OFDM for short packets of data or multiple endpoints. OFDMA combines transmissions and sends frames to multiple endpoints simultaneously. It is more efficient with lower latency transmission.
What are the differences between OFDMA and SC-FDMA?
SC- FDMA has a lower PAPR and lower sensitivity to carrier frequency errors while OFDMA provides better frequency diversity resulting in better immunity against multipath fading.
What is the main difference between FDM and TDM?
Definition: TDM is a process of transmitting multiple data streams over a single channel. Where each signal is divided into a fixed-length time slot. Whereas FDM is a process in which the total available bandwidth is divided into a series of non-overlapping frequency bands where each band carries a separate signal.
