Chaos-based wireless communication resisting multipath effects

Yao, Jun; Li, Chen; Ren, Hai‐Peng; Grebogi, Celso

doi:10.1103/physreve.96.032226

Cited by 42 publications

(78 citation statements)

References 33 publications

(44 reference statements)

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“…Finally, to verify the ultimate performance of acoustic combs, we did experiments in laboratory environment. In real field applications, some issues, such as multipath effect, water flow and ocean current, and inhomogeneity of sound speed, should find reliable solutions, which is also our future direction.…”

Section: Discussionmentioning

confidence: 99%

Precise Underwater Distance Measurement by Dual Acoustic Frequency Combs

Qian

Zhang

et al. 2019

Annalen der Physik

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Underwater acoustics is of fundamental importance for marine science and technology. However, acoustic waves transmitted by state‐of‐the‐art underwater acoustic systems are not inherently phase locked, which hinders the development of underwater acoustic technology. For example, the precision of underwater distance measurement can only achieve centimeter level. As a versatile tool, optical frequency combs have enabled revolutionary progress in optical metrology and precision measurement. In parallel with optical frequency combs, here, the generation of fully stabilized, underwater acoustic frequency combs is reported, in which equidistant acoustic modes are produced via a hydroacoustic transducer. The precision of each individual acoustic mode is measured to be 10−9 at 1 s and 10−12 at 1000 s averaging times. Underwater distance measurements are carried out in an anechoic pool using a dual‐comb scheme. Comparison with reference values shows consistency within 50 µm (7 × 10−6 in relative). The relatively long‐duration experiments at 7 m distance yield an Allan deviation of 1.8 µm (2.6 × 10−7 in relative) at 1 s and further 480 nm (6.8 × 10−8 in relative) at 40 s averaging times. The approach to acoustic frequency comb generation offers a promising and powerful platform for future underwater distance measurement, positioning, and navigation.

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Section: Discussionmentioning

confidence: 99%

Precise Underwater Distance Measurement by Dual Acoustic Frequency Combs

Qian

Zhang

et al. 2019

Annalen der Physik

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“…Одним из направлений применения динамических систем, демонстрирующих хаотическое поведение, стало их использование для скрытой передачи информации. Было предложено множество способов скрытой передачи информации с использованием динамического хаоса [1][2][3][4][5][6][7][8][9][10][11][12]. Однако количественную оценку криптографической стойкости таких систем связи провести довольно сложно из-за существенного отличия принципов построения математических алгоритмов криптографии [13] и систем скрытой связи на динамическом хаосе [1,2].…”

Section: Introductionunclassified

Estimation of confidentiality of a communication system based on chaotic time-delay generator with switchable delay time

Ponomarenko¹,

Navrotskaya²,

Kul’minskii³

et al. 2019

ICS

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Introduction: Communication systems based on the use of dynamical chaos have a number of positive features. Dynamical chaoshas the properties of random processes, which allows systems based on it to ensure the information transmission confidentiality.However, a quantitative security assessment of such systems is a complicated problem, since the methods for evaluating cryptographicstrength are well developed only for the classical encryption algorithms. Purpose: Development of a method for quantitative estimationof confidentiality of a binary signal hidden transmission in a communication system based on a chaotic time-delay oscillator withswitchable delay time. Results: A method is proposed for estimating the confidentiality of a binary information signal transmissionin a communication system using a chaotic time-delay oscillator with switchable delay time as a transmitter. The method is based onestimating the power of the key space for the chaotic communication system under study. We have considered the cases when sometransmitter parameters are known, and the most general case when all the transmitter parameters are unknown. A communicationsystem based on dynamical chaos may have a much higher confidentiality than the classical cryptographic algorithm using a cipher witha key length of 56 bits, but is significantly inferior in terms of cryptographic strength to a cipher with a key length of 128 bits. Practicalrelevance: The proposed method allows us to obtain a quantitative estimation of confidentiality of communication systems based ondynamical chaos, and compare it with the known strength of classical cryptographic algorithms.

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“…Moreover, the circuit implementation of ASCS and the corresponding matched-filter based detector were provided [ 2 ]. For its excellent performance against noise and its simplicity in circuit realization, ASCS has been used in chaos communication [ 5 , 6 , 7 , 8 , 9 , 10 , 11 ], chaos radar [ 12 , 13 ], and underwater ranging and navigation [ 14 ]. Reference [ 6 ] proved that the information encoded in the chaotic signal is kept after being transmitted through a wireless channel with multipath effects.…”

Section: Introductionmentioning

confidence: 99%

Blind Frequency Estimation and Symbol Recovery for the Analytically Solvable Chaotic System

Zhou

Wang

Luo

2019

Entropy

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The analytically solvable chaotic system (ASCS) is a promising chaotic system in chaos communication and radar fields. In this paper, we propose a maximum likelihood estimator (MLE) to estimate the frequency of ASCS, then a difference-integral (DI) detector is designed with the estimated frequency, and the symbols encoded in the signal are recovered. In the proposed method, the frequency parameter is estimated by an MLE based on the square power of the received signal. The Cramer-Rao lower bound in blind frequency estimation and the bit error performance in symbol detection are analyzed to assess the performance of the proposed method. Numerical results validate the analysis and demonstrate that the proposed symbol detector achieves the error performance with a little cost of 1 dB compared to the coherent detector. The robustness of the proposed method towards parameters is also verified through simulations.The characteristics of a chaotic signal-such as noise-like obscurity, aperiodicity, thumbtack-like correlation, sensitivity to initial conditions and system parameters-enable a chaotic signal to be widely investigated in engineering applications. Specifically, the noise-like property that determines the chaotic signal involves a low probability of interception (LPI), which is essential for secure communication and radar applications.In the last decade, a class of analytically solvable chaotic system (ASCS) was introduced [1-3]. ASCS is defined by a second-order differential equation and a discrete switching condition controlled by binary symbols. The ASCS can be expressed analytically with an exact solution by solving the differential equation. It can also be described by a linear convolution with a fixed basis function and binary symbols. Due to the fixed shape of the basis function, a matched filter was then proposed to recover the binary symbols from the received signal [4]. Experiment and analysis proved that its bit error rate (BER) performance is comparable to that of the binary phase-shift keying (BPSK). Moreover, the circuit implementation of ASCS and the corresponding matched-filter based detector were provided [2]. For its excellent performance against noise and its simplicity in circuit realization, ASCS has been used in chaos communication [5][6][7][8][9][10][11], chaos radar [12,13], and underwater ranging and navigation [14]. Reference [6] proved that the information encoded in the chaotic signal is kept after being transmitted through a wireless channel with multipath effects. In Reference [8], an easy coding method was proposed to encode the information bits into the initial value of the ASCS oscillator. The application of ASCS to the wireless channel was analyzed and tested through a circuit implementation. In Reference [9], a high-frequency reverse-time ASCS was successfully generated in an optical carrier, which is promising for optical secure communication. In Reference [11], a resisting-multipath technique was proposed to tackle the inter-symbol interference caused by multipath. In Referen...

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Chaos-based wireless communication resisting multipath effects

Cited by 42 publications

References 33 publications

Precise Underwater Distance Measurement by Dual Acoustic Frequency Combs

Precise Underwater Distance Measurement by Dual Acoustic Frequency Combs

Estimation of confidentiality of a communication system based on chaotic time-delay generator with switchable delay time

Blind Frequency Estimation and Symbol Recovery for the Analytically Solvable Chaotic System

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