Mathematical systems theory

, Volume 17, Issue 1, pp 217–241 | Cite as

Time-varying systems and crossed products

  • John Murray
Article

Abstract

Crossed product algebras are proposed as a framework for the study of input-output properties of linear time-varying systems. It is shown that internally stable systems with bounded continuous coefficients have transfer operators in a crossed product and conversely, that the set of all such transfer operators is dense in a crossed product. It is also shown that crossed product algebras admit causal additive decompositions, and allow a generalized frequency-domain representation.

Keywords

Computational Mathematic Stable System Transfer Operator Product Algebra Additive Decomposition 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    Kuh, E. S., Stability of Linear Time-Varying Networks—The State-space approach,IEEE Trans. Circuit Theory, CT-12 (1965), 150–157 (June).Google Scholar
  2. 2.
    Feintuch, A., and Saeks, R.,System Theory: A Hilbert Space Approach, New York, Academic Press, 1982.Google Scholar
  3. 3.
    Silverman, L. M. and Anderson, B. D. O., Controllability, observability and stability of linear systems,SIAM J. Control, 6 (1968), 121–129.Google Scholar
  4. 4.
    Naimark, M. A.,Normed Rings, P. Noordhoff N.V., Groningen, 1964.Google Scholar
  5. 5.
    Dixmeier, J.,Les C *-Algebres Et Leurs Representations, Cahiers Scientifiques, Fasc. 29, Gauthier-Villars, Paris 1964.Google Scholar
  6. 6.
    Suzuki, N., Crossed products of rings of operators,Tohuku Math J., 11 (1959), 113–124.Google Scholar
  7. 7.
    Zadeh, L. A., Frequency Analysis of variable networks,Proc. IRE, 38 (1950) 291–299.Google Scholar
  8. 8.
    Chen, C. T.,Introduction to Linear System Theory, New York, Holt Rinehart and Winston, 1970.Google Scholar
  9. 9.
    Gunning, R. C., and Rossi, H.,Analytic Functions of Several Complex Variables, Englewood Cliffs, NJ: Prentice-Hall, 1965.Google Scholar
  10. 10.
    Effros, E. G. and Hahn, F., Locally compact transformation groups andC *-algebras,Mem. Amer. Math. Soc. No. 75 (1967).Google Scholar
  11. 11.
    Rickart, C. E.,General Theory of Banach Algebras, Princeton, Van Nostrand, 1960.Google Scholar
  12. 12.
    Gootman, E. C., Primitive ideals ofC *-algebras associated with transformation groups,Trans. Amer. Math. Soc. 170 (1972), 97–108.Google Scholar
  13. 13.
    Kishimoto, A., Ideals ofC *-crossed products by locally compact Abelian groups,Proceedings of Symposia in Pure Mathematics, 38 (1982), Part 1, 365–368, A.M.S.Google Scholar
  14. 14.
    Jury, E. I. and Mullin, F. J., The Analysis of sampled-data control systems with a periodically time-varying sampling rate,IRE Trans. Auto. Control, AC-4 (1959) 15–21.Google Scholar
  15. 15.
    Davis, J. H., Stability conditions derived from spectral theory: Discrete systems with periodic feedback,SIAM J. Control, 10 (1972) 1–13.Google Scholar
  16. 16.
    Meyer, R. A. and Burrus, C. S., A unified analysis of multirate and periodically time-varying digital filters,IEEE Trans. Circuits and Systems, CAS-22 (3) (1975) 162–168.Google Scholar
  17. 17.
    Davis, J. H., Fredholm operators, encirclements and stability criteria,SIAM J. Control, 10 (1972) 608–628.Google Scholar
  18. 18.
    Whittaker, E. T. and Watson, G. N.,A Course of Modern Analysis, 4th Ed., Cambridge, Cambridge University Press, 1927.Google Scholar
  19. 19.
    Davis, J. H., A multi-time scale method in almost-periodic stability problems,SIAM J. Math. Anal. 9 (1978) 979–995.Google Scholar

Copyright information

© Springer-Verlag New York Inc 1984

Authors and Affiliations

  • John Murray
    • 1
  1. 1.Department of Electrical EngineeringTexas Tech UniversityLubbockUSA

Personalised recommendations