Title :
Delta-Modulation Coding Redesign for Feedback-Controlled Systems
Author :
Canudas-de-Wit, Carlos ; Gòmez-Estern, Fabio ; Rubio, Francisco Rodrìguez
Author_Institution :
Dept. of Autom. Control, Polytech. of Grenoble, Grenoble
fDate :
7/1/2009 12:00:00 AM
Abstract :
This paper investigates the closed-loop properties of the differential coding scheme known as delta-modulation (Delta-M) when used in feedback loops within the context of feedback controlled systems. We propose a new modified scheme of the original form of the Delta-M algorithm which is better suited for applications where the sensed information is used in feedback. A state feedback controller is implemented with the state estimated by a predictor based differential decoder. Stability of the resulting closed-loop system (controller-coder-decoder) is studied. These properties (stability and performance) depend on the quantization parameter Delta, which is assumed constant in the first part of this paper. In a further step, parameter Delta is made adaptive, by defining an adaptation law exclusively in terms of information available at both the transmitter and receiver side. With this approach both stability and performance is improved.
Keywords :
closed loop systems; control engineering computing; decoding; delta modulation; modulation coding; stability; state feedback; closed-loop system; delta-modulation coding redesign; differential coding scheme; feedback controlled system; networked controlled system; predictor based differential decoder; quantization parameter; stability; state feedback controller; Delta-modulation ($Delta$- $M$); differential coding; networked controlled systems (NCS);
Journal_Title :
Industrial Electronics, IEEE Transactions on
DOI :
10.1109/TIE.2009.2020079