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Background & Aims
Dietary changes can modulate gut microbiota and interact with cirrhosis. Our prior study demonstrated that microbial diversity was higher in cirrhotics from Turkish vs the USA, which was associated with lower risk of 90‐day hospitalizations. We aimed to define gut microbial functional and metabolomic changes to increase insight into benefits of the Mediterranean compared to...
In this paper, we propose a new iterative algorithm for the minimization of the constant modulus (CM) criterion. It is composed of two stages: Prewhitening followed by complex Givens rotations, whence the name Givens CMA (GCMA). Initially, prewhitening reduces the channel matrix into a unitary matrix. Subsequently, this unitary matrix is computed via complex Givens rotations by minimizing the CM criterion...
This paper deals with blind source separation (BSS) with time-varying MIMO (multiple input multiple output) channels in interception and diversity context (Alamouti code). A new algorithm based on an adaptive analytical multimodulus algorithm (MMA) is proposed and called adaptive-AMMA. An analytical method, which converges quickly, is necessary with time varying channels. Performances obtained with...
The context of this paper is interception, thus nothing is known on emission. This paper addresses the problem of time-varying multiple input multiple output channel estimation and tracking with Kalman filter for Alamouti scheme. Generally, Kalman filter must be initialized by training sequences, but in interception systems, such sequences don??t exist. So, we propose in this paper to use blind source...
We consider the problem of blind sources separation (BSS), i.e., without the use of training sequences, for a multiuser communication system using a linear multiple input multiple output (MIMO) system combined with an Alamouti or Tarokh space-time block coding scheme. In this coding scheme, each symbol is transmitted using several time slots and through a linear instantaneous mixing channel. In order...
In this paper, an optimized carrier recovery phase-error detector, based on hierarchical constellation concept is proposed in order to improve acquisition performances of the phase recovery loop. Theoretical and simulation results for quadrature amplitude modulation (16-QAM) signals and for a 5 dB signal-to-noise ratio per bit, show that a phase-error sensitivity gain of about 5 deg is obtained. Furthermore,...
In this paper, we introduce a fast orthonormalization technique for use in blind signal separation algorithms. We deal more particularly with the multiuser Kurtosis algorithm (M-UK). Like the majority of gradient-based blind signal separation algorithms, the MUK has a slow convergence speed. The fast orthonormalization technique has the property of preserving a certain continuity in the transformation...
In industrial baking, operators control the oven mainly by subjective evaluation of the color of the cookies. To standardize the quality of cookies, it should be interesting to replace the operator's subjective evaluation of color, by coupling a sensor and a data treatment tool like a classifier. With this aim, two different methods of classification were tested and compared: a fuzzy and a Bayesian...
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