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Modem‐based communications using synchronized chaos
Author(s) -
Carrasco R.,
Pointon C.
Publication year - 2001
Publication title -
international journal of communication systems
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.344
H-Index - 49
eISSN - 1099-1131
pISSN - 1074-5351
DOI - 10.1002/dac.470
Subject(s) - computer science , phase shift keying , additive white gaussian noise , chaotic , rayleigh fading , rician fading , communications system , bit error rate , electronic engineering , telecommunications , algorithm , channel (broadcasting) , fading , artificial intelligence , engineering
This paper considers the use of chaotic dynamics to enhance or add value to telecommunications systems. An application in the form of secure communications, with particular emphasis on mobile radio systems is investigated. Standard continuous time descriptions of the Lorenz and Chua chaotic attractors are transformed into the discrete time domain and used in the design of a secure chaotic modem which includes the digital modulation schemes: quadrature phase shift keying (QPSK) and π /4‐QPSK with square‐root raised cosine pulse shaping filters. The results of analytical computer simulations show that the performance of both modem systems over limited bandwidth additive white Gaussian noise (AWGN), and Rayleigh and Rician fading channels induces no degradation in the bit error probability. Finally, in order to demonstrate that the chaotic modem offers a degree of robustness to eavesdropping, a reconstruction model is derived and applied to the communication scheme. It is shown that, due to inaccurate information surrounding the state of the system, a reconstruction of the system was not possible. Copyright © 2001 John Wiley & Sons, Ltd.