Advantages of f-OFDM, Disadvantages of f-OFDM, Filtered OFDM
This page covers advantages and disadvantages of f-OFDM (Filtered OFDM) technique. It mentions f-OFDM advantages or benefits and f-OFDM disadvantages or drawbacks. The term f-OFDM stands for Filtered OFDM (Orthogonal Frequency Division Multiplexing).
What is f-OFDM?
As mentioned f-OFDM is the short form of Filtered Orthogonal Frequency Division Multiplexing. It is variation to conventional OFDM technique.
The figure-1 depicts use of filtering algorithm after IFFT/CP module in normal OFDM transmit chain. Refer difference between OFDM Vs f-OFDM >>.
Benefits or advantages of f-OFDM | Filtered OFDM
➨The f-OFDM technique offers all the advantages leveraged by OFDM such as flexible frequency multiplexing,
simple channel equalization and easy combination with multi antenna transmission.
Refer advantages and disadvantages of Conventional OFDM technique >>
Following are the benefits or advantages of f-OFDM (Filtered OFDM) :
➨Efficient utilization of spectrum
➨It suppresses Out Of Band Emission and hence guard band consumption can be reduced to minimum level.
➨Optimized numerology can be applied to suit the needs of certain type of services within each sub-bands.
➨Possibility to incorporate other waveforms such as GFDM, FBMC, UFMC etc.
➨Backward and forward compatibility
➨Using sub-band based filtering, global synchronization requirement is being relaxed. Hence inter-sub-band asynchronous transmission can be supported.
Drawbacks or disadvantages of f-OFDM | Filtered OFDM
Following are the disadvantages of f-OFDM (Filtered OFDM):
➨The f-OFDM requires additional pair of transmit and receiver filters in transmitter and receiver chain respectively compare to conventional OFDM.
➨Like OFDM, CP can also be used in filter-based waveforms such as UFMC, F-OFDM to protect signal from ISI.
➨Since full-band filtering can not remove any ICI, it exists in f-OFDM similar to standard OFDM.
Conclusion: The f-OFDM can overcome the drawbacks of OFDM technique while retaining its benefits. It is used in 5G technology due to overall performance, associated moderate complexity, cost and smoothness.