Decision Feedback Blind Equalizer with Tap-Leaky Whitening for Stable Structure-Criterion Switching. (30th December 2014)

• Record Type: Journal Article
• Authors: Krstić, Vladimir R.; Dukić, Miroslav L.
• Other Names: Laddomada Massimiliano Academic Editor.
• Is Part Of: International journal of digital multimedia broadcasting. Volume 2014(2014)
• Publication Date: 2014-12-30
• Subjects: Multimedia communications -- Periodicals; Digital audio broadcasting -- Periodicals; Mobile communication systems -- Periodicals; Digital audio broadcasting; Mobile communication systems; Multimedia communications; Periodicals; 621.382
• DOI: 10.1155/2014/987039
• Languages: English
• ISSNs: 1687-7578

Abstract

Abstract : The research presented in this paper improves the structure-criterion switching performance of the blind decision feedback equalizer (DFE) which eliminates error propagation effects by optimizing both the structure and the cost criterion. To conquer the complexity of the 64-QAM (quadrature amplitude modulated) signal constellation, the stochastic entropy-gradient algorithm is additionally regularized by the coefficient leaky term to avoid a coefficients norm overgrowth of the received signal whitener. Effectively, the leak of coefficients is employed to ensure a stable structure-criterion switching of DFE between blind and decision-directed operation modes. The optimization of the resulting whitening algorithm is achieved by means of two free, leaky and entropic, parameters which act in opposition to each other. Both, the influence of the 64-QAM signal on the feedback filter behavior and the parametric optimization of the whitening algorithm are analyzed through simulations.