Javier E. Kolodziej

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This paper discusses the constrained stochastic gradient (CSG) algorithm used for controlling antenna arrays, aiming to maximize the signal-to-interference-plus-noise ratio (SINR) in mobile communications. Firstly, analytical expressions for the first moment of the weight vector and the SINR characteristic of the standard CSG algorithm are derived for two(More)
This paper proposes an improved stochastic model for the normalized least-mean-square (NLMS) algorithm considering correlated input signals obtained from a spherically invariant random process (SIRP). A SIRP describes both Gaussian and a wide class of non-Gaussian processes, including the ones with Laplacian, K<sub>0</sub>, and Gamma marginal density(More)
This paper presents an improved statistical model for the transform-domain LMS algorithm operating in non-stationary environment from a time-varying plant. The stationary case is also considered as a particular case of the non-stationary one. The derived model takes into account a fixed-length sliding window for estimating the transformed input signal(More)
This paper presents an expert system which provides a graphical report that correlates strain signals with maintenance tasks. The considered maintenance tasks are related to the repairing of cavitation effects in hydropower turbines. By using simulated data, the performance of the proposed systems can be assessing. In sum, this work displays the usefulness(More)
This paper presents an analytical model for the constrained stochastic gradient (CSG) algorithm. This algorithm is used to obtain the weights of antenna arrays for mobile communications, aiming to maximize the signal-to-interference-plus-noise ratio (SINR) of such systems. For the algorithm performance evaluation, several operating conditions are considered(More)
This paper describes the study and the experimental implementation of a DC-DC boost converter used for photovoltaic solar arrays or energy storage banks. A 5 kW boost converter design with an input voltage between 100-120 V and a regulated output voltage of 400 V is carried out. A photovoltaic solar array or a battery bank can be used as input voltage(More)
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