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Comparison of different filter-bank based multicarrier systems with fractionally spaced equalisation

Nagy, Amr A. and Weiss, Stephan (2016) Comparison of different filter-bank based multicarrier systems with fractionally spaced equalisation. In: 11th IMA International Conference on Mathematics in Signal Processing. Institute of Mathematics and its Applications, Southend-on-sea, pp. 1-4.

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This paper compares two different filter bank multi carrier (FBMC) modulations: a critically sampled and therefore spectral maximally efficient FBMC orthogonal quadrature amplitude modulation (OQAM) approach, as well as an over sampled (OS)-FBMC system. Under a dispersive channel, FBMC/OQAM and OS-FBMC require equalisation and timing synchronisation, which here is accomplished by a fractionally spaced equaliser updated by a concurrent constant modulus and decision-directed algorithm. Simulation demonstrate that FBMC/OQAM is more difficult to equalise particularly at lower SNR, since its additional CCI terms amplify the equalisation algorithm’s gradient noise.