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Approaching the Matched Filter Bound with Coded OFDM and SC-FDE Schemes

Amaral, F. ; Dinis, R. ; Carvalho, PMC

Approaching the Matched Filter Bound with Coded OFDM and SC-FDE Schemes, Proc IEEE Military Communications Conf. - MILCOM, Baltimore, MD, United States, Vol. -, pp. - - -, November, 2011.

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Block transmission techniques, with appropriate cyclic prefixes and employing FDE techniques (Frequency-Domain Equalization), have been shown to be suitable for high data rate transmission over severely time-dispersive channels. The most popular techniques based on this concept are OFDM (Orthogonal Frequency Division Multiplexing) and SC-FDE (Single-Carrier with Frequency-Domain Equalization). In this paper we consider OFDM and SC-FDE coded transmission schemes and we study the impact of the number of multipath components and the diversity order on their performance. It is shown for both schemes that when we have a high number of separable multipath components the asymptotic performance approaches the MFB, even without diversity. When we have diversity the performance approaches the MFB faster, even with a small number of separable multipath components. It was also observed that the SC-FDE has a overall performance advantage over the OFDM option, especially when employing the IB-DFE with turbo equalization and for a high code rate.