Low SNR Capacity of FSO Links over Gamma-Gamma Atmospheric Turbulence Channels

Benkhelifa, Fatma; Rezki, Zouheir; Alouini, Mohamed‐Slim

doi:10.1109/lcomm.2013.043013.130119

Cited by 40 publications

(27 citation statements)

References 17 publications

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“…The transmission of this complex variable over the Gaussian quantum channel

scriptN

can be characterized by the

T ((), N) \in scriptC

normalized complex transmittance variable

T ((), N) = Re T ((), N) + i Im T ((), N),

where

0 \leq Re T ((), N) \leq 1 false/ \sqrt{2}

is the transmission of the position quadrature and

0 \leq Im T ((), N) \leq 1 false/ \sqrt{2}

is the transmission of the momentum quadrature. During the evaluation of the private classical capacity for an FSO setting, we assume that the CVQKD protocol operates in the low‐SNR regime, SNR→0, which is precisely the situation for practical CVQKD scenarios.…”

Section: System Modelmentioning

confidence: 99%

“…Free‐space optical (FSO) quantum links provide a tool to implement quantum communications via wireless telecommunication network infrastructures. As an integrated component of future quantum Internet and long‐distance quantum communications, the FSO quantum channels could play a significant role in the global‐scale practical implementations of quantum communications and quantum key distribution (QKD) .…”

Section: Introductionmentioning

confidence: 99%

“…An FSO quantum link's special characteristics require a specific mathematical description. The channel characteristics of the FSO quantum links are approachable via the mathematical framework of the GG (gamma‐gamma) distribution . The secret key rates for CVQKD schemes over FSO links and the performance of free‐space quantum links in diverse environmental conditions raise several questions and call for further examination.…”

Section: Introductionmentioning

confidence: 99%

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Secret key rates of free‐space optical continuous‐variable quantum key distribution

Gyöngyösi

Imre

2019

Int J Communication

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Summary In this letter, we derive the maximal achievable secret key rates for continuous‐variable quantum key distribution (CVQKD) over free‐space optical (FSO) quantum channels. We provide a channel decomposition for FSO‐CVQKD quantum channels and study the SNR (signal‐to‐noise ratio) characteristics. The analytical derivations focus particularly on the low‐SNR scenarios. The results are convenient for wireless quantum key distribution and for the quantum Internet.

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“…The transmission of this complex variable over the Gaussian quantum channel

scriptN

can be characterized by the

T ((), N) \in scriptC

normalized complex transmittance variable

T ((), N) = Re T ((), N) + i Im T ((), N),

where

0 \leq Re T ((), N) \leq 1 false/ \sqrt{2}

is the transmission of the position quadrature and

0 \leq Im T ((), N) \leq 1 false/ \sqrt{2}

Section: System Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Secret key rates of free‐space optical continuous‐variable quantum key distribution

Gyöngyösi

Imre

2019

Int J Communication

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“…Inspite of having the aforementioned advantages, the performance of the FSO systems gets severely affected due to its dependence on the atmospheric conditions and the pointing errors (because of the misalignment between the transmitter and the receiver)-making them unreliable for long-range communication [1], [2]. The capacity of the FSO links have been evaluated for various models of wireless optical channel [3]- [5]. In [3], the asymptotic behaviour of the capacity of the FSO communication system under Gamma-Gamma turbulence is studied over the low SNR region.…”

Section: Introductionmentioning

confidence: 99%

“…The capacity of the FSO links have been evaluated for various models of wireless optical channel [3]- [5]. In [3], the asymptotic behaviour of the capacity of the FSO communication system under Gamma-Gamma turbulence is studied over the low SNR region. Various technologies have been been incorporated with FSO communication systems, in order to improve their performance, e.g.…”

Section: Introductionmentioning

confidence: 99%

On the capacity of decode-and-forward dual-hop free space optical communication systems

Anees

Bhatnagar

2014

2014 IEEE Wireless Communications and Networking Conference (WCNC)

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In this paper, the analytical channel capacity of the decode-and-forward (DF) based dual-hop free space optical (FSO) system is studied. The FSO links are assumed to be asymmetric in nature and the turbulence is considered to follow the Gamma-Gamma distribution. For the considered DF FSO cooperative system, power series based mathematical expressions of the average channel capacity are derived, under the influence of atmospheric turbulence with negligible and significant pointing errors in the FSO links. Simulation results validate the proposed capacity analysis. The effect of channel conditions and pointing errors, on the capacity of DF FSO communication system, is analyzed by using the derived expressions. It is observed that the average capacity of the system, with significant pointing errors, is severely degraded as compared to the average capacity with only atmospheric turbulence; because the pointing errors contribute with the turbulence, in a multiplicative manner.

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Physical layer security for dual‐hop FSO/RF system using generalized ΓΓ/η−μ fading channels

Kumar

Garg

2017

Int J Communication

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We investigate the physical layer security of decode-and-forward-relayed free space optics (FSO)/radio frequency (RF) communication system. In this network, the eavesdropper exists after relay node and overhears RF transmission.Further, FSO being a line-of-sight transmission is assumed to be secure from eavesdroppers. Here, we have the Gamma-Gamma (ΓΓ) distribution for FSO link and generalized − distribution for RF link. The security for information transmission to the legitimate user in the presence of an eavesdropper is measured in terms of secrecy capacity and secrecy outage probability. Deriving the probability density function and cumulative distribution function of end-to-end signal-to-noise ratio, the closed-form expressions for security parameters are achieved. The numerical analysis of the proposed system is done under the influence of atmospheric turbulence effects and various fading conditions. The results have been verified through simulation. KEYWORDSdual hop, FSO/RF system, physical layer security, secrecy capacity, secrecy outage probability Int J Commun Syst. 2018;31:e3468.wileyonlinelibrary.com/journal/dac to confuse eavesdropper. They provide secure transmission but require higher transmitting signal power to generate artificial noise. Moreover, the design of beamformer is a bit difficult due to computational complexity. The situation when main link condition is worse than the eavesdropper link creates hassle in security analysis of RF system. This limitation can be improved by using the multiple-input multiple-output (MIMO), 5 multiple-input and single-output (MISO), 6 and single-input and multiple-output (SIMO) 7 systems. However, due to high cost and size limitations, the designing of the network system with multiple antennas becomes difficult. The free space optics (FSO) has emerged as an effective solution to provide secured transmission with high data rate because it is a line-of-sight (LoS) transmission. 8 However, it has a limited transmission distance of the order of few kilometers only. It is a license-free transmission, but atmospheric turbulence effects (ie, smoke, snow, and fog) are main factors in deteriorating the performance of an FSO system. The PLS analysis of single hop FSO system investigated in 9 in which the secrecy performance was evaluated for data transmission consisting of single source and destination in the presence of an eavesdropper.Because of the complementary properties of FSO and RF communications, mixed FSO/RF systems have gained the attention of various researchers. These systems are more economical and save unnecessary modifications in existing system networks. They also avoid significant interference as both communications operate on different frequency bands. 10 It has been found that RF link can be a wiretapping link in mixed FSO/RF systems. Hence, the secure and legitimate transmission via mixed systems remains impossible before applying PLS. Recently, trade-off analysis on security-reliability is investigated for multiuser SIMO based RF/FSO relay networks...

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Low SNR Capacity of FSO Links over Gamma-Gamma Atmospheric Turbulence Channels

Cited by 40 publications

References 17 publications

Secret key rates of free‐space optical continuous‐variable quantum key distribution

Secret key rates of free‐space optical continuous‐variable quantum key distribution

On the capacity of decode-and-forward dual-hop free space optical communication systems

Physical layer security for dual‐hop FSO/RF system using generalized ΓΓ/η−μ fading channels

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