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A Simplified Constant Modulus Algorithm for Blind Recovery of MIMO QAM and PSK Signals: A Criterion with Convergence Analysis

EURASIP Journal on Wireless Communications and Networking volume 2007, Article number: 090401 (2007) Cite this article

Abstract

The problem of blind recovery of QAM and PSK signals for multiple-input multiple-output (MIMO) communication systems is investigated. We propose a simplified version of the well-known constant modulus algorithm (CMA), named simplified CMA (SCMA). The SCMA cost function consists in projection of the MIMO equalizer outputs on one dimension (either real or imaginary part). A study of stationary points of SCMA reveals the absence of any undesirable local stationary points, which ensures a perfect recovery of all signals and a global convergence of the algorithm. Taking advantage of the phase ambiguity in the solution of the new cost function for QAM constellations, we propose a modified cross-correlation term. It is shown that the proposed algorithm presents a lower computational complexity compared to the constant modulus algorithm (CMA) without loss in performances. Some numerical simulations are provided to illustrate the effectiveness of the proposed algorithm.

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  1. IETR/SUPELEC, Campus de Rennes, Avenue de la Boulaie, CS 47601, Cesson-Sévigné, 35576, France

    Aissa Ikhlef & Daniel Le Guennec

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  1. Aissa Ikhlef
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  2. Daniel Le Guennec
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Correspondence to Aissa Ikhlef.

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Ikhlef, A., Le Guennec, D. A Simplified Constant Modulus Algorithm for Blind Recovery of MIMO QAM and PSK Signals: A Criterion with Convergence Analysis. J Wireless Com Network 2007, 090401 (2007). https://doi.org/10.1155/2007/90401

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