SSP'05 -- Proceedings

	IEEE/SP 13th workshop on Statistical Signal Processing July, 17-20, 2005 - Bordeaux - France

Information regarding the paper

Title

Diamond Contour-Based Phase Recovery for Cross-QAM Constellations

Author(s)

Marcos Álvarez-Díaz	Departamento de Teoría de la Señal y las Comunicaciones, Universidad de Vigo
Roberto López-Valcarce	Departamento de Teoría de la Señal y las Comunicaciones, Universidad de Vigo

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Abstract

Two new iterative methods for blind phase estimation of QAM signals are presented. The algorithms seek the maxima of certain cost functions derived from the dispersion of the de-rotated data with respect to a diamond-shaped contour, and their distinctive feature is the inclusion of a sign nonlinearity at every iteration. A connection between one of these methods and the standard fourth-power method is presented. Simulations with cross-QAM constellations show that, when properly initialized, the new schemes present lower variance than the fourth-power method, and may even outperform Cartwright's eighth-order method.