A chaotic direct-sequence spread-spectrum communication system

Heidari-Bateni, G.; McGillem, C.D.

doi:10.1109/tcomm.1994.582834

Cited by 445 publications

(147 citation statements)

References 9 publications

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“…In order to improve the covertness of the communications, noise-like chaotic spreading sequences can be used to conceal the signals. Chaotic sequences are usually generated using discrete chaotic maps, such as the logistic map, triangular map, and exponential map [6]- [8]. The logistic map is one of the simplest and most widely studied (1) where , , and is called a bifurcation parameter.…”

Section: A Chaotic Sequencesmentioning

confidence: 99%

“…Depending on the value of , the dynamics of this system can change dramatically, exhibiting periodicity or chaos. For , the sequence is periodic with a period for some integer ; while for , the sequence is, for all practical purposes, nonperiodic and nonconverging [2], [6]- [8]. The histogram of the noise-like chaotic sequences in some cases has been proven to follow a certain probability density distribution (pdf) [2].…”

Section: A Chaotic Sequencesmentioning

confidence: 99%

“…Therefore, the detection probability can be determined via a function. For the random variable , we are able to find its mean and variance where , , is the Kronecker delta function, which implies the presence of a signal for or the absence of the signal for , and the chip SNR (6) Notice that in deriving or implementing (6), we assume that a binary correlating function is used to detect a nonbinary chaotic sequence . Therefore, the detectors for binary spreading sequences are applied directly to detect the presence of chaotic spreading signals.…”

Section: A Synchronous Coherent Intercept Receivermentioning

confidence: 99%

“…Recently, the signal interception problem is also studied with a self-recovering receiver for DS SS signals with unknown spreading codes and its performance is analyzed and presented in [5]. To improve the security of the DS SS systems, nonbinary and nonperiodic chaotic sequences, which have been investigated in [2] and [6]- [8] are desirable for covert communications because their pseudo-random waveforms can be very useful in disguising signals as noise. Another advantage of using chaotic sequences is the large number of available spreading sequences for multiple-access applications [2].…”

Section: Introductionmentioning

confidence: 99%

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Detection performance of chaotic spreading LPI waveforms

Yao

2005

IEEE Trans. Wireless Commun.

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Abstract-Low probability of intercept (LPI) performance of a direct-sequence (DS) spread-spectrum (SS) system with chaotic spreading sequences is investigated in this paper. Several intercept receivers, including energy detectors, synchronous and asynchronous, coherent and noncoherent structures, which are typically used to detect binary DS SS signals, are examined here to detect the presence of chaotic DS SS signals. A simple detection approach using a binary correlating function to detect nonbinary chaotic sequences is proposed. The expressions of detection probabilities of chaotic spreading signals using those intercept receivers are derived. Comparisons between systems using chaotic and binary sequences are given in terms of the LPI performance, and the performance improvement with chaotic spreading sequences is observed.Index Terms-Chaos, low probability of intercept (LPI), spread spectrum (SS).

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Section: A Chaotic Sequencesmentioning

confidence: 99%

Section: A Chaotic Sequencesmentioning

confidence: 99%

Section: A Synchronous Coherent Intercept Receivermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Detection performance of chaotic spreading LPI waveforms

Yao

2005

IEEE Trans. Wireless Commun.

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“…One major difference between chaotic sequences and another type of Pseudorandom Number (PN) sequences is that chaotic sequences are not binary. Therefore the main advantages of their usage are increased security of the transmission and also ease of generation and visualization of great number of sequences [24]. Generation of chaos is described in [22,23,25], Direct Sequence Spread Spectrum (DSSS) CDMA with chaotic sequences is described for example in [14], Direct Sequence (DS) CDMA is described in [15][16][17][18][19][20][21] and MC/DS CDMA is described in [4].…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of MC-CDMA Sytems Using Chaotic and Conventional Spreading Sequences

Palubová¹,

Galajda²

2011

Acta Electrotechnica Et Informatica

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Chaos in Communications

Yao

Chen

2003

Wiley Encyclopedia of Telecommunications

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This paper examines the roles in which chaos have been used in various approaches in communications. In the first approach, instead of modulating a periodic sinusoidal carrier as in conventional communications, various forms of modulation using an aperiodic chaotic waveform have been proposed. They include chaotic masking, dynamical feedback, chaotic switching, and different versions of chaos shift keying. Since these continuous‐time chaotic digital communication systems are modeled as stochastic nonlinear dynamical systems, the error probabilities of many of these systems do not have analytically tractable forms, but must be numerically evaluated using Ito/Stratonovich stochastic integrations. In the second approach, symbolic dynamics viewed as a “coarse‐grained” description of a chaotic dynamical system is exploited for modulating/coding of digital data. In the third approach, chaotic dynamics are viewed as analog channel encoders. In the fourth approach, communications using chaotic pulse‐position‐modulation are discussed. In the fifth approach, CDMA communication systems using spread sequences generated from chaotic dynamics are considered. Finally, in the sixth approach, the roles of chaos in laser communication and modeling of RF propagation effects for clutter and fading channel are discussed. Some comments are also provided on the practicality of various chaos‐based communication schemes.

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A chaotic direct-sequence spread-spectrum communication system

Cited by 445 publications

References 9 publications

Detection performance of chaotic spreading LPI waveforms

Detection performance of chaotic spreading LPI waveforms

Performance Analysis of MC-CDMA Sytems Using Chaotic and Conventional Spreading Sequences

Chaos in Communications

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