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Journal articles on the topic 'Chaos Shift Keying (CSK)'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

MANJUNATH, G., and D. FOURNIER-PRUNARET. "CONSTRUCTION OF CHAOTIC MAPS ON NONCONVEX SPACES — A SOLUTION TO A CSK DECIPHERING PROBLEM." International Journal of Bifurcation and Chaos 20, no. 08 (2010): 2553–59. http://dx.doi.org/10.1142/s0218127410027180.

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In this paper, we propose a solution to one of the problems raised by the authors [Manjunath & Fournier-Prunaret, 2009a] with regard to a deciphering issue in the chaos shift keying technique. Here, we construct maps on nonconvex spaces using a class of chaotic maps on the (closed) unit square and prove that they exhibit chaos. The constructed maps serve as a practical solution to control the deciphering errors in chaos shift keying.

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2

LAU, FRANCIS C. M., and CHI K. TSE. "OPTIMUM CORRELATOR-TYPE RECEIVER DESIGN FOR CSK COMMUNICATION SYSTEMS." International Journal of Bifurcation and Chaos 12, no. 05 (2002): 1029–38. http://dx.doi.org/10.1142/s0218127402004863.

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In a chaos-shift-keying (CSK) digital communication system, correlators followed by a comparator are typically used for coherent detection of the signal. Such a detection method, however, does not take the temporal variation of the bit energy into consideration. In this paper, an optimum detection for a binary CSK system is derived, taking into account the temporal variation of the bit energy for minimizing the error rates. Simulations are carried out to compare the performance between the optimum receiver and a typical receiver. The results provide theoretical performance benchmarks of cohere

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3

Capligins, F., A. Litvinenko, A. Aboltins, E. Austrums, A. Rusins, and D. Pikulins. "Experimental Study of the Chaotic Jerk Circuit Application for Chaos Shift Keying." Latvian Journal of Physics and Technical Sciences 58, no. 4 (2021): 55–68. http://dx.doi.org/10.2478/lpts-2021-0033.

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Abstract The paper presents a study of the chaotic jerk circuit (CJC) employment capabilities for digital communications. The concept of coherent chaos shift keying (CSK) communication system with controlled error feedback chaotic synchronization is proposed for a specific CJC in two modifications. The stability of chaotic synchronization between the two CJCs was evaluated in terms of voltage drop at the input of the slave circuit and the impact of channel noise using simulations and experimental studies.

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4

Zhang, Gang, Niting Cui, and Tianqi Zhang. "Novel Chaos Secure Communication System Based on Walsh Code." Journal of Electrical and Computer Engineering 2015 (2015): 1–6. http://dx.doi.org/10.1155/2015/649096.

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A multiuser communication scheme which is a hybrid of Walsh code with DCSK and CDSK is proposed to improve low data transmission rate of Differential Chaos Shift Keying (DCSK), poor bit error ratio (BER) performance of Correlation Delay Shift Keying (CDSK), and disadvantage of orthogonality in traditional multiuser DCSK. It not only overcomes the disadvantages of DCSK and CDSK, but also has better performance than CDSK and higher transmission data rate than DCSK. It has been proved that the novel multiuser CDSK-DCSK has better properties than traditional Multiple Input Multiple Output-Differen

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5

Al Bassam, Nizar, and Oday D. Jerew. "Analysis and Design of an Energy Efficient Differential Coherent Chaos Based System in Additive White Gaussian Noise Environment." Journal of Engineering 2017 (2017): 1–9. http://dx.doi.org/10.1155/2017/7404197.

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A new differential coherent chaos based scheme is proposed and named as Differential Chaos ON-OFF Keying (DCOOK). The proposed scheme provides reduction in bit energy and better bit error performance at large spreading factor. This is achieved by presenting each transmitted bit by either identical segment or no transmission within same bit duration. The receiver performs simple correlation between the received signal and its delayed version to determine the transmitted information utilizing the low correlation between the noise signals. The bit error rate (BER) performance of the proposed sche

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6

Duan, J. Y., G. P. Jiang, and H. Yang. "A Novel Multiple-Access Correlation-Delay-Shift-Keying." International Journal of Bifurcation and Chaos 27, no. 02 (2017): 1750025. http://dx.doi.org/10.1142/s0218127417500250.

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In Correlation-Delay-Shift-Keying (CDSK), the reference signal and the information-bearing signal are added together during a certain time delay. Because the reference signal is not strictly orthogonal to the information-bearing signal, the cross-correlation between the adjacent chaotic signal (Intra-signal Interference, ISI) will be introduced into the demodulation at the receiver. Therefore, the Bit-Error Ratio (BER) of CDSK is higher than that of Differential-Chaos-Shift-Keying (DCSK). To avoid the ISI component and enhance the BER performance of CDSK in multiuser scenario, Multiple-Access

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7

N. Albassam, Nizar. "Reference flipped-differential chaos ‎shift keying scheme for chaos- based ‎communications." International Journal of Engineering & Technology 4, no. 2 (2015): 320. http://dx.doi.org/10.14419/ijet.v4i2.4014.

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In this paper, a new differential coherent chaos-based communication system is proposed and named Reference Flipped-DCSK (RF-DCSK). By utilizing the low correlation value between a chaotic segment and its flipped version, each transmitted signal will be the sum of the information bearing signal and the mirrored version of the reference signal. This enhances the bandwidth efficiency of DCSK by doubling bits rate. Additionally, noise performance is improved at typical values of the spreading factor. According to Gaussian approximation method, theoretical expression for Bit-Error-Rate (BER) is de

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8

TSE, CHI K., and FRANCIS C. M. LAU. "A RETURN MAP REGRESSION APPROACH FOR NONCOHERENT DETECTION IN CHAOTIC DIGITAL COMMUNICATIONS." International Journal of Bifurcation and Chaos 13, no. 03 (2003): 685–90. http://dx.doi.org/10.1142/s0218127403006790.

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Chaos-based communications can be applied advantageously if the property of chaotic systems is suitably exploited. In this Letter a simple noncoherent detection method for chaos-shift-keying (CSK) modulation is proposed, exploiting some distinguishable property of chaotic maps for recovering the digital message. Specifically, the proposed method exploits the difference in the return maps of the signals representing the digital symbols. The determining parameter of the return maps is estimated using a simple regression algorithm. If the parameter strongly characterizes the chaotic map, the dete

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9

Al Bassam, Nizar, and Oday Jerew. "Design and Implementation of a Chaotic Scheme in Additive White Gaussian Noise Channel." Journal of Computer Networks and Communications 2016 (2016): 1–7. http://dx.doi.org/10.1155/2016/5976282.

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A new chaotic scheme named Flipped Chaotic On-Off Keying (FCOOK) is proposed for binary transmission. In FCOOK, the low correlation value between the stationary signal and its mirrored version is utilized. Transmitted signal for binary 1 is a chaotic segment added to its time flipped (mirrored) version within one bit duration, while in binary 0, no transmission takes place within the same bit duration. The proposed scheme is compared with the standard chaotic systems: Differential Chaos Shift Keying (DCSK) and Correlation Delay Shift Keying (CDSK). The Bit Error Rate (BER) of FCOOK is studied

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10

Simic, Ljiljana, and Stevan Berber. "DSP Prototype of a Chaos-Based Multi-User Communication System: Design and Performance Analysis." African Journal of Information & Communication Technology 2, no. 2 (2006): 71. http://dx.doi.org/10.5130/ajict.v2i2.223.

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This paper presents the implementation of a multi-user chaos-based communication system in DSP (digital signal processor) technology. The system is based on the chaotic phase shift keying (CPSK) digital modulation scheme, where chaotic signals are used as the spreading sequences of a CDMA (code division multiple access) system. Using chaotic signals offers the advantages of increased security and higher system capacity compared with conventional sequences. The aim of this hardware implementation was to enable a comparison against analytical performance results for CPSK. The transceiver prototy

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11

Quyen, Nguyen Xuan. "On the Study of a Quadrature DCSK Modulation Scheme for Cognitive Radio." International Journal of Bifurcation and Chaos 27, no. 09 (2017): 1750135. http://dx.doi.org/10.1142/s0218127417501358.

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The past decade has witnessed a boom of wireless communications which necessitate an increasing improvement of data rate, error-rate performance, bandwidth efficiency, and information security. In this work, we propose a quadrature (IQ) differential chaos-shift keying (DCSK) modulation scheme for the application in cognitive radio (CR), named CR-IQ-DCSK, which offers the above improvement. Chaotic signal is generated in frequency domain and then converted into time domain via an inverse Fourier transform. The real and imaginary components of the frequency-based chaotic signal are simultaneousl

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12

Schimming, T., and M. Hasler. "Optimal detection of differential chaos shift keying." IEEE Transactions on Circuits and Systems I: Fundamental Theory and Applications 47, no. 12 (2000): 1712–19. http://dx.doi.org/10.1109/81.899923.

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13

Cheng, Guixian, Lin Wang, Weikai Xu, and Guanrong Chen. "Carrier Index Differential Chaos Shift Keying Modulation." IEEE Transactions on Circuits and Systems II: Express Briefs 64, no. 8 (2017): 907–11. http://dx.doi.org/10.1109/tcsii.2016.2613093.

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14

Zhu, Zhiliang, Jingping Song, Yanjie Song, and Hai Yu. "A Multiaddress Co-Chaos Shift Keying Communication Scheme and Performance Analysis." International Journal of Bifurcation and Chaos 24, no. 04 (2014): 1450050. http://dx.doi.org/10.1142/s0218127414500503.

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A new multiaddress Co-Chaos Shift keying communication scheme (MA-CoCSK) was proposed based on analyzing the permutation-based differential chaos-shift-keying (PMA-DCSK) scheme and the Antipodal Chaos-Shift-Keying (ACSK) scheme. We also analyzed the bit error rate of the new scheme in Gaussian white noise channel and compared its performance with that of the PMA-DCSK scheme. Theory analysis and simulation results both indicate that the scheme proposed in this paper can not only improve the transmission efficiency of a communication system, but also decrease the bit error rate significantly whi

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15

Herceg, Marijan, Kruno Miličević, and Tomislav Matić. "Frequency-translated differential chaos shift keying for chaos-based communications." Journal of the Franklin Institute 353, no. 13 (2016): 2966–79. http://dx.doi.org/10.1016/j.jfranklin.2016.06.006.

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16

Rajagopal, Karthikeyan, Sajad Jafari, Akif Akgul, Anitha Karthikeyan, Serdar Çiçek, and Yasser Shekofteh. "A Simple Snap Oscillator with Coexisting Attractors, Its Time-Delayed Form, Physical Realization, and Communication Designs." Zeitschrift für Naturforschung A 73, no. 5 (2018): 385–98. http://dx.doi.org/10.1515/zna-2017-0426.

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AbstractIn this paper, we report a novel chaotic snap oscillator with one nonlinear function. Dynamic analysis of the system shows the existence of bistability. To study the time delay effects on the proposed snap oscillator, we introduce multiple time delay in the fourth state equation. Investigation of dynamical properties of the time-delayed system shows that the snap oscillator exhibits the same multistable properties as the nondelayed system. The new multistable hyperjerk chaotic system has been tested in chaos shift keying and symmetric choc shift keying modulated communication designs f

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17

Huang, Tingting, Weikai Xu, Lin Wang, and Francis C. M. Lau. "Multilevel code-shifted differential-chaos-shift-keying system." IET Communications 10, no. 10 (2016): 1189–95. http://dx.doi.org/10.1049/iet-com.2015.1109.

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18

Taleb, Fadia, Fethi Tarik Bendimerad, and Daniel Roviras. "Very high efficiency differential chaos shift keying system." IET Communications 10, no. 17 (2016): 2300–2307. http://dx.doi.org/10.1049/iet-com.2016.0411.

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19

Galias, Z., and G. M. Maggio. "Quadrature chaos-shift keying: theory and performance analysis." IEEE Transactions on Circuits and Systems I: Fundamental Theory and Applications 48, no. 12 (2001): 1510–19. http://dx.doi.org/10.1109/tcsi.2001.972858.

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20

Salberg, A. B., and A. Ha. "A subspace theory for differential chaos-shift keying." IEEE Transactions on Circuits and Systems II: Express Briefs 53, no. 1 (2006): 51–55. http://dx.doi.org/10.1109/tcsii.2005.854590.

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21

XU, W. K., L. WANG, and G. KOLUMBÁN. "A NOVEL DIFFERENTIAL CHAOS SHIFT KEYING MODULATION SCHEME." International Journal of Bifurcation and Chaos 21, no. 03 (2011): 799–814. http://dx.doi.org/10.1142/s0218127411028829.

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In binary Differential Chaos Shift Keying (DCSK), the reference and information bearing chaotic wavelets are transmitted in two consecutive time slots. This TDMA approach provides two independent channels for the transmission of reference and information bearing wavelets but requires a delay component both in the modulator and demodulator circuits, furthermore, it halves the data attainable data rate. The wideband Radio Frequency (RF) delay lines at receiver are extremely difficult to implement with CMOS technology, therefore, the DCSK modulation cannot be exploited in many applications, such

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22

Hasan, Salsabeel S., and Zahir M. Hussain. "Signal Properties under Multi-Carrier Chaos–Shift Keying." Journal of Physics: Conference Series 1804, no. 1 (2021): 012088. http://dx.doi.org/10.1088/1742-6596/1804/1/012088.

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23

Alabbasi, Hesham Adnan, Izz Kadhum Abboud, and Fadhil Sahib Hasan. "PERFORMANCE ANALYSIS OF QUADRATURE CHAOS SHIFT." Acta Polytechnica 60, no. 1 (2020): 1–11. http://dx.doi.org/10.14311/ap.2020.60.0001.

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One of the most famous techniques of non-coherent differential chaos shift keying (DCSK) is Quadrature chaos shift keying (QCSK) system, this system suffered from lowering the data rate and increasing the bit energy during the bit transmission even though its rate doubling the one of the DCSK. Short reference (SR) algorithm is proposed for the QCSK system to design the SR-QCSK communication system that enhances these drawbacks. The main idea of the short reference technique is minimizing the length of the reference chaotic signal (β) at a transmitter by a factor P comparing to produce R sample

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24

Yang, Hua, and Guo-Ping Jiang. "High-Efficiency Differential-Chaos-Shift-Keying Scheme for Chaos-Based Noncoherent Communication." IEEE Transactions on Circuits and Systems II: Express Briefs 59, no. 5 (2012): 312–16. http://dx.doi.org/10.1109/tcsii.2012.2190859.

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25

Cuenot, J. B., L. Larger, J. P. Goedgebuer, and W. T. Rhodes. "Chaos shift keying with an optoelectronic encryption system using chaos in wavelength." IEEE Journal of Quantum Electronics 37, no. 7 (2001): 849–55. http://dx.doi.org/10.1109/3.929583.

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26

Cai, Xiangming, Weikai Xu, Shaohua Hong, and Lin Wang. "Dual-Mode Differential Chaos Shift Keying With Index Modulation." IEEE Transactions on Communications 67, no. 9 (2019): 6099–111. http://dx.doi.org/10.1109/tcomm.2019.2918518.

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27

Zhou, Hong Min, Ying Zhang, and Ying Yu. "Noise Reduction Multi-Carrier Differential Chaos Shift Keying System." Journal of Circuits, Systems and Computers 27, no. 14 (2018): 1850233. http://dx.doi.org/10.1142/s021812661850233x.

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In multi-carrier differential chaos shift keying (MC-DCSK) system, channel noises pollute both the reference and data signals, resulting in deteriorated performance. To reduce noises in received signals in MC-DCSK, a novel noise reduction MC-DCSK (NR-MC-DCSK) system is proposed in this paper. The proposed system utilizes duplicated chaotic samples, rather than different ones, as the reference. At the receiver side, identical samples can be averaged before correlation detection, which helps decrease the noise interferences and thus brings performance improvement. Theoretical bit error rate (BER

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28

Abdullah, Hikmat N., Thamir R. Saeed, and Asaad H. Sahar. "Efficient error correcting scheme for chaos shift keying signals." International Journal of Electrical and Computer Engineering (IJECE) 9, no. 5 (2019): 3550. http://dx.doi.org/10.11591/ijece.v9i5.pp3550-3557.

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An effective error-correction scheme based on normalized correlation for a non coherent chaos communication system with no redundancy bits is proposed in this paper. A modified logistic map is used in the proposed scheme for generating two sequences, one for every data bit value, in a manner that the initial value of the next chaotic sequence is set by the second value of the present chaotic sequence of the similar symbol. This arrangement, thus, has the creation of successive chaotic sequences with identical chaotic dynamics for error correction purpose. The detection symbol is performed prio

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29

Lau, F. C. M., M. M. Yip, C. K. Tse, and S. F. Hau. "A multiple-access technique for differential chaos-shift keying." IEEE Transactions on Circuits and Systems I: Fundamental Theory and Applications 49, no. 1 (2002): 96–104. http://dx.doi.org/10.1109/81.974883.

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30

Maggio, G. M., and Z. Galias. "Applications of symbolic dynamics to differential chaos shift keying." IEEE Transactions on Circuits and Systems I: Fundamental Theory and Applications 49, no. 12 (2002): 1729–35. http://dx.doi.org/10.1109/tcsi.2002.805701.

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31

Herceg, Marijan, Kruno Miličević, and Tomislav Matić. "Correlation-Multi-Delay-Shift-Keying for Chaos Based Communications." Wireless Personal Communications 88, no. 2 (2015): 283–94. http://dx.doi.org/10.1007/s11277-015-3108-5.

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32

Fang, Nian, Lutang Wang, Shuqin Guo, and Zhaoming Huang. "Security of polarization-shift keying chaos optical communication system." Frontiers of Optoelectronics in China 1, no. 1-2 (2008): 64–69. http://dx.doi.org/10.1007/s12200-008-0009-1.

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33

Tanaka, Shuhei, and Shogo Usami. "Consideration on Multiplexing Code Shift Keying on Optical CDMA System." IEEJ Transactions on Electronics, Information and Systems 130, no. 12 (2010): 2174–75. http://dx.doi.org/10.1541/ieejeiss.130.2174.

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34

Martínez-Ciro, Roger Alexander, Francisco Eugenio López-Giraldo, Andrés Felipe Betancur-Perez, and Jose Martín Luna-Rivera. "Design and Implementation of a Multi-Colour Visible Light Communication System Based on a Light-to-Frequency Receiver." Photonics 6, no. 2 (2019): 42. http://dx.doi.org/10.3390/photonics6020042.

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Colour-shift keying (CSK) is a visible light communication (VLC) modulation scheme used in the existing IEEE 802.15.7 standard. In CSK, information is transmitted by changing the light intensities of the RGB LEDs. In this work, a low-complexity VLC system is proposed using CSK modulation and a novel receiver based on a light-to-frequency (LTF) converter. At the receiver, CSK symbols are interpreted and decoded in terms of frequencies, which are processed by a counter module of a generic microcontroller, thus avoiding the use of analog-to-digital converters (ADCs), which results in a low-cost V

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35

F. Fahad, Hayder, and Fadhil S. Hassan. "DESIGN AND PERFORMANCE ANALYSIS OF ORTHOGONAL MULTI-LEVEL CODE-SHIFTED DIFFERENTIAL CHAOS SHIFT KEYING COMMUNICATION SYSTEM." Journal of Engineering and Sustainable Development 24, no. 06 (2020): 42–56. http://dx.doi.org/10.31272/jeasd.24.6.4.

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Based on Orthogonal Chaotic Vector Shift Keying (OCVSK) system and Multilevel Code-Shifted Differential Chaos Shift Keying (MCS-DCSK) system, a new Multilevel Code-Shifted Differential Chaos Shift Keying (OMCS-DCSK) modulation system is proposed and designed in this paper. New orthogonal chaotic signal sets are generated using Gram-Schmidt algorithm and Walsh code function then these signals are used for bearing information bits to achieve higher data rate and better bandwidth efficiency compared with the conventional DCSK communication system. The bit error rate (BER) analysis of the OMCS-DCS

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36

Ĉelikovský, Sergej, and Volodymyr Lynnyk. "Anti-synchronization chaos shift keying method: error derivative detection improvement.*." IFAC Proceedings Volumes 42, no. 7 (2009): 128–33. http://dx.doi.org/10.3182/20090622-3-uk-3004.00026.

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37

Soujeri, E., G. Kaddoum, and M. Herceg. "Design of an initial condition‐index chaos shift keying modulation." Electronics Letters 54, no. 7 (2018): 447–49. http://dx.doi.org/10.1049/el.2018.0119.

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38

Kumar, Atul, and Pravas Ranjan Sahu. "Performance analysis of spatially modulated differential chaos shift keying modulation." IET Communications 11, no. 6 (2017): 905–9. http://dx.doi.org/10.1049/iet-com.2016.0810.

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39

Kaddoum, Georges, and Ebrahim Soujeri. "NR-DCSK: A Noise Reduction Differential Chaos Shift Keying System." IEEE Transactions on Circuits and Systems II: Express Briefs 63, no. 7 (2016): 648–52. http://dx.doi.org/10.1109/tcsii.2016.2532041.

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40

Yang, Hua, Wallace K. S. Tang, Guanrong Chen, and Guo-Ping Jiang. "Multi-Carrier Chaos Shift Keying: System Design and Performance Analysis." IEEE Transactions on Circuits and Systems I: Regular Papers 64, no. 8 (2017): 2182–94. http://dx.doi.org/10.1109/tcsi.2017.2685344.

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41

Cheng, Guixian, Xuan Chen, Wansong Liu, and Wenjun Xiao. "GCI-DCSK: Generalized Carrier Index Differential Chaos Shift Keying Modulation." IEEE Communications Letters 23, no. 11 (2019): 2012–16. http://dx.doi.org/10.1109/lcomm.2019.2933827.

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42

Quyen, Nguyen Xuan. "Multi-carrier differential chaos-shift keying with repeated spreading sequence." Journal of Communications and Networks 20, no. 3 (2018): 299–308. http://dx.doi.org/10.1109/jcn.2018.000042.

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43

Pinkney, J. Q., R. Davies, and P. L. Camwell. "Chaos shift keying communications system using self-synchronising Chua oscillators." Electronics Letters 31, no. 13 (1995): 1021–22. http://dx.doi.org/10.1049/el:19950758.

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44

Lawrance, Anthony J., and Ji Yao. "Likelihood-Based Demodulation in Multi-User Chaos Shift Keying Communication." Circuits, Systems & Signal Processing 27, no. 6 (2008): 847–64. http://dx.doi.org/10.1007/s00034-008-9063-6.

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45

MANJUNATH, G., and D. FOURNIER-PRUNARET. "A QUALITATIVE ANALYSIS OF DECIPHERING ERRORS IN CHAOS SHIFT KEYING." International Journal of Bifurcation and Chaos 19, no. 06 (2009): 2085–92. http://dx.doi.org/10.1142/s0218127409023925.

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This article gives a topological and measure-dynamics based analysis on the deciphering of cipher texts encoded by the basic chaos shift keying scheme. Our analysis gives a proof of the ambiguity involved in deciphering and also shows that the deciphering error is a source of practical concern.

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46

Long, M., F. Peng, and Y. Chen. "Bit error rate improvement for chaos shift keying chaotic communication systems." IET Communications 6, no. 16 (2012): 2639–44. http://dx.doi.org/10.1049/iet-com.2012.0103.

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47

Kaddoum, Georges, and François Gagnon. "Design of a High-Data-Rate Differential Chaos-Shift Keying System." IEEE Transactions on Circuits and Systems II: Express Briefs 59, no. 7 (2012): 448–52. http://dx.doi.org/10.1109/tcsii.2012.2198982.

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48

Ĉelikovský, Sergej, Volodymyr Lynnyk, and Michael Šebek. "ANTI-SYNCHRONIZATION CHAOS SHIFT KEYING METHOD BASED ON GENERALIZED LORENZ SYSTEM." IFAC Proceedings Volumes 39, no. 8 (2006): 323–28. http://dx.doi.org/10.3182/20060628-3-fr-3903.00058.

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49

Miao, Meiyuan, Lin Wang, Marcos Katz, and Weikai Xu. "Hybrid Modulation Scheme Combining PPM With Differential Chaos Shift Keying Modulation." IEEE Wireless Communications Letters 8, no. 2 (2019): 340–43. http://dx.doi.org/10.1109/lwc.2018.2871137.

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50

HASLER, MARTIN, and THOMAS SCHIMMING. "CHAOS COMMUNICATION OVER NOISY CHANNELS." International Journal of Bifurcation and Chaos 10, no. 04 (2000): 719–35. http://dx.doi.org/10.1142/s0218127400000505.

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The problem of transmitting digital information using chaotic signals over a channel with Gaussian white noise perturbation is introduced rigorously. It is shown that discrete time base-band chaotic communication systems with discrete time Gaussian white noise in the channel are sufficiently general in this context. The optimal receiver is given explicitly in terms of conditional probabilities. For the example of chaos shift keying using iterations of the tent map, the optimal classifier is constructed explicitly. Finally, it is shown how previously published methods, in particular those based

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