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Chirp-based multicarrier modulation

Solyman, Ahmed and Weiss, Stephan and Soraghan, John (2012) Chirp-based multicarrier modulation. In: 9th IMA International Conference on Mathematics in Signal Processing, 2012-12-17 - 2012-12-20.

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Abstract

In this paper we demonstrate that in doubly-dispersive environments, a multicarrier (MC) system based on a fractional Fourier transform (FrFT) can achieve a better concentration of power near the main diagonal of the equivalent channel matrix compared to standard orthogonal frequency division multiplexing (OFDM). The resulting inter-symbol and inter-carrier interference in such a chirp- based MC system can therefore be suppressed with a reduced complexity equaliser. Simulations show that compared to an equalised OFDM system, the equalised FrFT-MC approach can either significantly reduce complexity or enhance performance in a time-varying environment.