Design of Sparse Digital Finite-Precision Controller Structures based on an Improved Closed-Loop Stability Related Measure

J. Wu and S. Chen (UK)


Digital controller, finite word length, closed-loop stability, sparse realization, optimization, real-time computation.


An improved closed-loop stability measure is derived for digital controller structures with finite-word-length (FWL) implementation, which takes into account the number of trivial elements in a controller realization. A practical pro cedure is presented to design sparse controller realizations with good FWL closed-loop stability characteristics. A case study shows that the proposed design procedure yields computationally efficient controller realizations with en hanced FWL closed-loop stability performance.

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