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Iterative Frequency-Domain Equalization for General Constellations

Dinis, R. ; Carvalho, P. ; Souto, N.S. ; Silva, J. C.

Iterative Frequency-Domain Equalization for General Constellations, Proc IEEE Sarnoff Symp. , Princeton, United States, Vol. -, pp. - - -, April, 2010.

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Abstract
IB-DFE (Iterative Block DFE) is a promising turbo equalization technique for SC-FDE schemes (Single-Carrier with Frequency Domain Equalization). However, typical IB-DFE implementations are tailored for a specific constellation (usually QPSK).
In this paper we propose a general method for designing IB-DFE receivers for any constellation. Our approach relies on an analytical characterization of the mapping rule were the constellation symbols are written as a linear function of the transmitted bits. This method is then employed in both uniform and non-uniform QAM constellations.