Spread Spectrum Communications Based on Chaotic Systems

Lipton, J. M.; Dabke, K. P.

doi:10.1142/s021812749600151x

Cited by 33 publications

(7 citation statements)

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“…Over the past ten years, a number of interesting chaotic spread spectrum communication systems had been proposed Parlitz, et al, 1992;Kocarev et al, 1992;Dedieu et al, 1993;Parlitz et al, 1994;Itoh & Murakami, 1995;Lipton & Dabke, 1996;Yang & Chua, 1997a, 1997b, 1997c, 1998a, 1998bItoh, 1999]. In the usual setting of chaotic spread spectrum communication systems, the message signals are modulated by chaotic spreading signals and then the spreaded signals are transmitted to receivers.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Impulsive Synchronization of Chaotic and Hyperchaotic Circuits

Itoh

Yang

Chua

1999

Int. J. Bifurcation Chaos

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In this paper, experimental results on impulsive synchronization of two kinds of chaotic circuits; namely, Chua's oscillator and a hyperchaotic circuit, are presented. To impulsively synchronize two Chua's oscillators, synchronization impulses sampled from one state variable of the driving circuit are transmitted to the driven circuit. To impulsively synchronize two hyperchaotic circuits, synchronizing impulses sampled from two signals of the driving circuit are sent to the driven circuit. Our experimental results show that the accuracy of impulsive synchronization depends on both the period and the width of the impulse. The ratio between the impulse width and impulse period for "almost-identical" synchronization increases as the impulse period increases. The robustness of impulsive synchronization to additive noise is also experimentally studied. For sufficiently short impulse periods, no significant differences are observed between impulsive and continuous synchronizations. The performance of chaotic spread spectrum communication systems based on impulsive synchronization is also studied experimentally.

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Section: Introductionmentioning

confidence: 99%

Experimental Study of Impulsive Synchronization of Chaotic and Hyperchaotic Circuits

Itoh

Yang

Chua

1999

Int. J. Bifurcation Chaos

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“…The details of these maps are shown in Ref. [13][14][15][16][17]. At last, the binary chaotic sequence is obtained through binary quantization.…”

Section: Classical Chaotic Sequencesmentioning

confidence: 99%

A ranging code based on the improved Logistic map for future GNSS signals: code design and performance evaluation

Wang¹,

Xue

Sun

2017

J Wireless Com Network

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Ranging code is the core component of the signal transmission scheme in any global navigation satellite system (GNSS); its performance directly influences on the technical indexes of positioning accuracy, compatibility, interoperability, anti-interference, security, synchronization realization, and so on. Therefore, research on ranging codes could provide theoretical support for the improvement of the performance of ranging codes and extension of their design methods to future satellite navigation signal structures. In order to improve the balance in classical chaotic sequences, a novel ranging code is proposed in this paper and constructed by a series of the improved Logistic-map chaotic sequences with different initial values through weighted optimization, summation, and quantization. Then a comprehensive performance evaluation method based on the Welch bound including three main indexes has been introduced, namely the performance of acquisition, tracking, and robustness against interfering narrowband signals. Finally, the three indexes are combined in a cost function by weighting to evaluate the proposed code, coarse/acquisition (C/A), Gold, Weil, and Random as well as the conventional chaotic codes, and the corresponding weighted coefficients can be adjusted flexibly according to the user groups or application types. Theoretical analysis and simulation results over an additive white Gaussian noise (AWGN) channel show that the proposed ranging code cannot only demonstrate excellent performance in acquisition and anti-narrowband interference while maintaining high quality in tracking performance as the C/A code but also significantly improve balance performance and strengthen reliability and security.

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“…where Q is the Gaussian error function, d is the minimum distance between two signals, defined as function of SNR and the cross-coherence coefficient, as given by (9). The performance of MCCM in AWGN channel is shown in figure 2 for different users where M= 2, 4, 6, and 8 and time bandwidth product 4= 1000.…”

Section: A Performance Ofmccmsignals In a Wgnmentioning

confidence: 99%

Performance of Wide Band Multi-User Frequency Hopping Chaotic Chirp Modulation (FH/MCCM) In Multipath Dispersive Media

El‐Khamy

Shaaban

Thabet

2005

EUROCON 2005 - The International Conference on "Computer as a Tool"

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New forms of multi-user chaotic chirp modulation (MCCM) signals that are characterized by the same power as well as the same bandwidth are introduced in this paper. The combination of frequency hopping spread spectrum (FHSS) techniques with (MCCM) is investigated to design a multiple-access technique that is characterized by good performance in dispersive and fading propagation media as well as reduced multiple-access interference (MAI). The new suggested frequency-hopped multi-user chaotic chirp modulation (FH/MCCM) is investigated in detail and its performance is shown to outperform that of (MCCM). Chaotic Carrier Frequency Hopping (CCFH) is used where the hopping is according to a chaotic map. Also, a novel Chaotic Slope Fast Hopping (CSFH) is also considered in which each user generate a chirp signal with a chaotic linear frequency sweeping slope.

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Spread Spectrum Communications Based on Chaotic Systems

Cited by 33 publications

References 0 publications

Experimental Study of Impulsive Synchronization of Chaotic and Hyperchaotic Circuits

Experimental Study of Impulsive Synchronization of Chaotic and Hyperchaotic Circuits

A ranging code based on the improved Logistic map for future GNSS signals: code design and performance evaluation

Performance of Wide Band Multi-User Frequency Hopping Chaotic Chirp Modulation (FH/MCCM) In Multipath Dispersive Media

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