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Decentralized design of interconnected H infinity feedback control systems with quantized signals

Zhai G., Chen N., Gui W.

International Journal of Applied Mathematics and Computer Science

2013

Vol. 23, no. 2

317--325

In this paper, we consider the design of interconnected H infinity feedback control systems with quantized signals. We assume that a decentralized dynamic output feedback has been designed for an interconnected continuous-time LTI system so that the closed-loop system is stable and a desired H infinity disturbance attenuation level is achieved, and that the subsystem measurement outputs are quantized before they are passed to the local controllers. We propose a local-output-dependent strategy for updating the parameters of the quantizers, so that the overall closed-loop system is asymptotically stable and achieves the same H infinity disturbance attenuation level. Both the pre-designed controllers and the parameters of the quantizers are constructed in a decentralized manner, depending on local measurement outputs.

Support Region Determination of the Quasilogarithmic Quantizer for LAPLACIAN source

Aleksić D., Perić Z., Nikolić J.

Przegląd Elektrotechniczny

2012

R. 88, nr 7a

130-132

This paper proposes the method for the support region determination of the quasilogarithmic quantizer designed for the Laplacian source and an arbitrary variance. The method is based on the minimal distortion criteria and it implies some approximations yielding the asymptotic formula for the optimal support region threshold of the quasilogarithmic quantizer. This formula shows which parameters influence the support region threshold of the quasilogarithmic quantizer which is of great importance for practical implementation of the considered quantizer in the high-quality quantization of signals, which, as well as speech signals, have statistics modeled by the Laplacian probability density function.

W artykule zaproponowano metodę określania region pomocniczego (support region) w quasi logarytmicznym kwantyzerze zaprojektowanym do źródeł typu Laplasian o dowolnej wariancji. Kwantyzer może być zastosowany między innymi do kodowania mowy w systemach komunikacyjnych.