Strange attractors in multipath propagation: detection and characterization

C. Tannous; R. Davies; A. Angus

doi:10.1117/12.138459

1 October 1992 Strange attractors in multipath propagation: detection and characterization

C. Tannous, R. Davies, A. Angus

Proceedings Volume 1705, Visual Information Processing; (1992) https://doi.org/10.1117/12.138459
Event: Aerospace Sensing, 1992, Orlando, FL, United States

Abstract

Multipath propagation of radio waves in indoor/outdoor environments shows a highly irregular behavior as a function of time. Typical modeling of this phenomenon assumes the received signal is a stochastic process composed of the superposition of various altered replicas of the transmitted one, their amplitudes and phases being drawn from specific probability densities. We set out to explore the hypothesis of the presence of deterministic chaos in signals propagating inside various buildings at the University of Calgary. The correlation dimension versus embedding dimension saturates to a value between 3 and 4 for various antenna polarizations. The full Liapunov spectrum calculated contains two positive exponents and yields through the Kaplan-Yorke conjecture the same dimension obtained from the correlation sum. The presence of strange attractors in multipath propagation hints to better ways to predict the behavior of the signal and better methods to counter the effects of interference. The use of Neural Networks in non linear prediction will be illustrated in an example and potential applications will be highlighted.

Citation Download Citation

C. Tannous, R. Davies, and A. Angus "Strange attractors in multipath propagation: detection and characterization", Proc. SPIE 1705, Visual Information Processing, (1 October 1992); https://doi.org/10.1117/12.138459

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