Enhancing the security of free space optical communication system by employing chaos-based modulation scheme

Narang, Ghanishtha; Aggarwal, Mona; Kaushal, Hemani; Ahuja, Swaran

doi:10.1515/joc-2022-0085

Cited by 7 publications

(3 citation statements)

References 44 publications

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“…It can be seen from the figure that the ABER performance improves on decreasing the values of M . For the higher value of M , the transmitted signal will be difficult to intercept [26], [27], [51].…”

Section: Average Secrecy Analysismentioning

confidence: 99%

Differential Chaos Shift Keying for FSO Systems: A Novel Approach Under Turbulence and Boresight Pointing Errors

Deep Verma,

Mathur,

Bhatnagar

2024

IEEE Open J. Commun. Soc.

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In the last two decades, chaos-based signals have achieved much popularity due to their useful waveform properties such as non-periodicity, wide-band nature, and robustness against eavesdropping by intruders. In this paper, we utilize differential chaos shift keying (DCSK) for free space optical (FSO) communication systems to improve their performance under the combined influence of atmospheric turbulence (AT) and non-zero boresight pointing errors (PEs). We employ the generalized Malaga distribution for modeling the channel gain under all turbulence regimes from weak to strong. Moreover, we utilize the modified Rayleigh distribution to incorporate the effect of jitter and boresight PEs. The computation of the exact average bit error rate (ABER) expression for the proposed FSO system using DCSK is quite tedious. Therefore, we propose two approximations for ABER of the proposed system which show a tight match with the exact analysis and are also valid for the homodyne detection (HMD), heterodyne detection (HD), and intensity modulation/direct detection (IM/DD) techniques. We also observe the impact of different AT parameters (α, β), spreading factor (M ), and non-zero boresight PE parameters (k x , k y ) on the ABER performance of the DCSK-based FSO system. Further, we derive asymptotic ABER expression to obtain insightful observations into the FSO system performance. We also compare the ABER performance of the proposed DCSK-based FSO system with an FSO system employing, correlation delay shift keying (CDSK), binary phase shift keying (BPSK), and code division multiple access (CDMA). We also derive the generalized ergodic capacity (EC) for the considered FSO communication system and show the effect of the spreading factor and boresight on the EC of the DCSK FSO communication system. We derive closed form expression of the average secrecy capacity (ASC) under the combined effect of AT and nonzero boresight PEs for the considered DCSK FSO system.INDEX TERMS Differential chaos shift keying (DCSK), ergodic capacity (EC), free space optical (FSO), atmospheric turbulence (AT), non-zero boresight, pointing errors (PEs), Malaga distribution, homodyne detection (HMD), heterodyne detection (HD), and intensity modulation/direct detection (IM/DD).

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Section: Average Secrecy Analysismentioning

confidence: 99%

Differential Chaos Shift Keying for FSO Systems: A Novel Approach Under Turbulence and Boresight Pointing Errors

Deep Verma,

Mathur,

Bhatnagar

2024

IEEE Open J. Commun. Soc.

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“…The authors in [29] presents wavelength division multiplexing (WDM) based secure FSO via OptiSystem software and which gives very high data rates upto 40 Gb/s. Secrecy analysis of DCSK-FSO communication system in presence of eavesdropper in terms of average secrecy capacity (ASC) and secrecy outage probability (SOP), is presented in [30]. Physical layer security analysis of DCSK based power line communication (PLC) is performed in [31] considering multiple eavesdroppers with Log-normally distributed channels.…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of Differential Chaos Shift Keying in Free Space Optical Communication With Diversity Techniques

et al. 2023

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This paper explores the performance of a single input multiple output (SIMO) free space optical (FSO) communication system using differential chaos shift keying (DCSK) with diversity combining techniques. Specifically, the paper presents the use of maximal ratio combining (MRC), equal gain combining (EGC), and selection combining (SC) diversity techniques for the DCSK-FSO system. Adding chaos to FSO systems using diversity can significantly improve the reliability and the system performance, making them a promising option for various 5G/6G wireless applications. The inherent properties of chaos, such as security, wide band nature, and immunity to fading, make it an attractive option for FSO communication. The Gamma-Gamma turbulence model was used to characterize the FSO link, and the system's performance was analyzed in terms of bit error probability across varying atmospheric turbulence levels, link lengths, and numbers of receivers. The results indicate that under the same system conditions, MRC/EGC performs 2-4 dB better in terms of error probability than the SC diversity technique. Furthermore, the SIMO-DCSK-FSO system presents a substantial improvement in diversity gain, with around 30 dB for moderate turbulence and 37 dB for strong turbulence.

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“…For example, in a typical wiretap model, PLS theory states that secure communication is possible if the capacity of the legitimate channel is higher than that of the eavesdropping channel. Motivated by the PLS schemes of RF systems, various PLS techniques have been proposed to secure FSO communications, such as diversity approaches [10], [11], transmit aperture selection (TAS) [12], artificial noise injection [13], and generalized chaotic modulation [14]. However, many characteristics of FSO systems differ from RF systems (e.g., the channel, and the physical characteristics of the transmitting and receiving devices).…”

mentioning

confidence: 99%

Opportunistic Schedule Selection for Multiuser MIMO FSO Communications: A Security- Reliability Trade-Off Perspective

Shakir

Charafeddine²,

Satai³

et al. 2023

IEEE Photonics J.

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The security and reliability of free space optical (FSO) communications and the trade-off between the two are the most critical characteristics to emphasize in FSO systems, especially as optical wireless communications continue to evolve. In this work, we investigate the impact of opportunistic transmit aperture selection (TAS) on the security-reliability trade-off (SRT) of the multiuser multiple-input multiple-output (MU-MIMO) free space optical system. We consider a general scenario in which the FSO system consists of a transmitter side with 𝑲 users and a single receiver with 𝑵 apertures communicating over generalized Malaga-M turbulence channels. We derive the TAS combined signal-to-noise ratio (SNR) distributions for the FSO MIMO channel between the transmitting users and the receiver. A statistical analysis of the TAS scheme is performed, where the 𝒌th best user with the highest SNR is selected. Based on this analysis, the closed-form expressions for the outage probability, average bit error rate, intercept probability, and SRT are derived. Then, the diversity advantages provided by the channel variations considering the atmospheric turbulence and generalized nonzero boresight pointing errors are further discussed. The results show that the considered TAS significantly improves the security, reliability, and SRT performance and has the potential to solve existing FSO communication problems. Monte Carlo simulations are used to verify the correctness of the numerical results.

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Enhancing the security of free space optical communication system by employing chaos-based modulation scheme

Cited by 7 publications

References 44 publications

Differential Chaos Shift Keying for FSO Systems: A Novel Approach Under Turbulence and Boresight Pointing Errors

Differential Chaos Shift Keying for FSO Systems: A Novel Approach Under Turbulence and Boresight Pointing Errors

Performance Analysis of Differential Chaos Shift Keying in Free Space Optical Communication With Diversity Techniques

Opportunistic Schedule Selection for Multiuser MIMO FSO Communications: A Security- Reliability Trade-Off Perspective

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