Adaptive filtering with bandwidth constraints in the feedback path

Authors:
György Orosz;László Sujbert;Gábor Péceli
Affiliations:
Department of Measurement and Information Systems, Budapest University of Technology and Economics, Magyar tudósok krt. 2., IE-444, H-1117 XI. Budapest, Hungary;Department of Measurement and Information Systems, Budapest University of Technology and Economics, Magyar tudósok krt. 2., IE-444, H-1117 XI. Budapest, Hungary;Department of Measurement and Information Systems, Budapest University of Technology and Economics, Magyar tudósok krt. 2., IE-444, H-1117 XI. Budapest, Hungary
Venue:
Signal Processing
Year:
2012

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Abstract

This paper introduces a new, adaptive-filter-based controller that shows advantageous properties from the viewpoint of its communication requirement. The algorithm is called signed-error filtered-x LMS (SE-FxLMS). Its novelty is characterized by the fact that it makes possible data compression in the feedback path of adaptive-filter-based control loops in a very simple way. This feature is especially useful in such closed-loop systems where the feedback signals are transmitted over a low-bandwidth communication channel. This is a typical case in so-called networked control systems (NCS), where the communication is carried out over a shared communication channel, e.g., using a wireless sensor network. The paper introduces an analysis of the algorithm as well.