Filter Bank Multicarrier Modulation, FBMC Tutorial

- filter bank multicarrier modulation is a development of OFDM that overcomes some its shortcomings enabling higher throughput date rates..

Filter Bank MultiCarrier, FBMC is a form of multi-carrier modulation that is being investigated for some future high data rate wireless and cellular systems.

FBMC is a derivative of orthogonal frequency division multiplexing, but it overcomes some of its shortcomings.

It has a much better usage of the available capacity and is able to offer higher data rates within a given radio spectrum bandwidth.

Filter Bank MultiCarrier basics

Filter bank multicarrier aims to overcome some of the shortcomings that were encountered with OFDM, orthogonal frequency division multiplexing.

One of the main shortcomings arises from the fact that OFDM requires the use of what is termed a cyclic prefix. The cyclic prefix is essentially a copy of part of a transmitted symbol in OFDM that is appended at the beginning of the next.

This redundancy reduces the throughput of the transmission and also wastes power.

A further disadvantage of OFDM is that spectral localisation of the subcarriers is weak and this results in spectral leakage and interference issues with unsynchronised signals.

Filter bank multicarrier is a development of OFDM. Using banks of filters that are implemented, typically using digital signal processing techniques, FBMC.

When carriers were modulated in an OFDM system, sidelobes spread out either side. With a filter bank system, the filters are used to remove these and therefore a much cleaner carrier results.

By Ian Poole

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