The role of synchronization in digital communications using chaos. II. Chaotic modulation and chaotic synchronization
- 1 January 1998
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Circuits and Systems I: Regular Papers
- Vol. 45 (11) , 1129-1140
- https://doi.org/10.1109/81.735435
Abstract
For pt. I see ibid., vol. 44, p. 927-36 (1997). In a digital communications system, data are transmitted from one location to another by mapping bit sequences to symbols, and symbols to sample functions of analog waveforms. The analog waveform passes through a bandlimited (possibly time-varying) analog channel, where the signal is distorted and noise is added. In a conventional system the analog sample functions sent through the channel are weighted sums of one or more sinusoids; in a chaotic communications system the sample functions are segments of chaotic waveforms. At the receiver, the symbol may be recovered by means of coherent detection, where all possible sample functions are known, or by noncoherent detection, where one or more characteristics of the sample functions are estimated. In a coherent receiver, synchronization is the most commonly used technique for recovering the sample functions from the received waveform. These sample functions are then used as reference signals for a correlator. Synchronization-based coherent receivers have advantages over noncoherent receivers in terms of noise performance, bandwidth efficiency (in narrow-band systems) and/or data rate (in chaotic systems). These advantages are lost if synchronization cannot be maintained, for example, under poor propagation conditions. In these circumstances, communication without synchronization may be preferable. The theory of conventional telecommunications is extended to chaotic communications, chaotic modulation techniques and receiver configurations are surveyed, and chaotic synchronization schemes are describeKeywords
This publication has 21 references indexed in Scilit:
- An observer looks at synchronizationIEEE Transactions on Circuits and Systems I: Regular Papers, 1997
- Phase Synchronization of Chaotic OscillatorsPhysical Review Letters, 1996
- Stochastic approach to spread spectrum communication using chaosPublished by SPIE-Intl Soc Optical Eng ,1995
- Recovery of digital signals from chaotic switchingInternational Journal of Circuit Theory and Applications, 1995
- Generalized synchronization of chaos in directionally coupled chaotic systemsPhysical Review E, 1995
- SYNCHRONIZATION THEOREM FOR A CHAOTIC SYSTEMInternational Journal of Bifurcation and Chaos, 1995
- Synchronizing nonautonomous chaotic circuitsIEEE Transactions on Circuits and Systems II: Express Briefs, 1993
- Three steps to chaos. I. EvolutionIEEE Transactions on Circuits and Systems I: Regular Papers, 1993
- Synchronization in chaotic systemsPhysical Review Letters, 1990
- Stability Theory of Synchronized Motion in Coupled-Oscillator SystemsProgress of Theoretical Physics, 1983