Enhancing earth-to-satellite FSO system spectrum efficiency with adaptive M-ary PSK and SIMO in presence of scintillation and beam wander

Alshaer, Nancy; Ismail, Tawfik; Nasr, Mohamed E.

doi:10.1016/j.aeue.2020.153366

Cited by 13 publications

(5 citation statements)

References 21 publications

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“…where F γ F SO (γ F SO ) is given by (6). By differentiating (10) with respect to γ F SO , the PDF of γ c in this case is given by…”

Section: Joint Dual-branch Threshold Combining and Adaptive Modulatio...mentioning

confidence: 99%

“…This transmit diversity technique had shown a noticeable performance improvement of the OGS-satellite FSO transmission system at the expense of an increased hardware complexity at the receiver side. Another method is adopting the adaptive modulation technique in which a target bit error rate (BER) is maintained while adjusting the parameters of the modulation scheme, such as the constellation size according to the channel state information (CSI) [10,11]. This technique aims to use the FSO channel more efficiently in adverse channel conditions as the FSO channel experiences slow-fading [5].…”

Section: Introductionmentioning

confidence: 99%

“…This technique aims to use the FSO channel more efficiently in adverse channel conditions as the FSO channel experiences slow-fading [5]. In [10], the capacity of the FSO uplink was improved through changing the modulation order of an M-phase shift keying (M-PSK) modulation scheme. In [11], the spectral efficiency of the FSO uplink was improved by changing the modulation order of an M-amplitude shift keying (M-ASK) modulation scheme.…”

Section: Introductionmentioning

confidence: 99%

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Low-complexity joint transmit diversity and adaptive modulation schemes for OGS-satellite FSO uplink

Elsaidy,

Rakia,

Abdelaziz

et al. 2023

J. Phys.: Conf. Ser.

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In this paper, we present two novel low-complexity transmission schemes for optical ground station (OGS)-satellite free space optical (FSO) uplink. Specifically, the TCAM-scheme which is a joint dual-branch threshold combining and adaptive modulation scheme and the SCAM-scheme which is a joint dual-branch selection combining and adaptive modulation scheme. In both schemes, the data rate is adjusted according to the instantaneous received combined SNRs at the satellite. We analyze the performance of the proposed schemes in terms of the outage probability, the average spectral efficiency and average bit error rate, while considering both subcarrirer intensity modulation/direct detection (SIM/DD) and coherent FSO detection techniques. Numerical results show that both TCAM and SCAM schemes provide better performance as compared to a single FSO uplink, while SCAM scheme enjoys better performance than TCAM scheme. This comes at the expense of increased complexity of the SCAM scheme. Also, coherent FSO detection technique shows better performance than the SIM/DD FSO detection technique for both schemes. The choice of which scheme and which FSO detection technique to use is a compromise of required quality of service and complexity.

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“…where F γ F SO (γ F SO ) is given by (6). By differentiating (10) with respect to γ F SO , the PDF of γ c in this case is given by…”

Section: Joint Dual-branch Threshold Combining and Adaptive Modulatio...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Low-complexity joint transmit diversity and adaptive modulation schemes for OGS-satellite FSO uplink

Elsaidy,

Rakia,

Abdelaziz

et al. 2023

J. Phys.: Conf. Ser.

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show abstract

“…In Ref. 11, the authors have considered the spectrum efficiency of the FSO system from ground-to-satellite is analyzed under the combined effect of atmospheric turbulence and beam wandering employing MPSK. In Ref.…”

Section: Introductionmentioning

confidence: 99%

Performance analysis of adaptive transmission based on power control over atmosphere composite channel

et al. 2023

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.In free space optical (FSO) communications systems, the signal fading caused by atmospheric turbulence is a slow fading, so adaptive transmission technology can effectively mitigate the problem of channel fading. Considering the combined effects of turbulence, attenuation, and pointing errors on the atmospheric transmission of laser signals, we proposed an adaptive M-ary phase shift keying subcarrier modulation algorithm based on power control and studied the combined adaptation of modulation size and average transmit power. Karush-Kuhn-Tucker conditions are used to solve the optimization problem of maximizing the throughput under the constraint of average transmit power, the expressions of throughput and outage probability are derived based on Meijer G-function. We finally evaluated the effects of turbulence intensity, beam waist radius, jitter standard deviation, weather conditions, and maximum modulation order on the throughput and outage probability of adaptive system.

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“…Quantum cryptography solves the most difficult problem in modern cryptography, namely, key distribution. Once the key is generated it is subsequently utilized in a symmetric cipher, such as the one-time pad or one of the modern symmetric ciphers, to securely transmit information over a public classical authenticated channel [1], [2]. The quantum channel between the two remote entities who established the key, traditionally named Alice and Bob, can be optical fiber cable or free-space optical (FSO) channel [3], [4].…”

mentioning

confidence: 99%

Performance Evaluation and Security Analysis of UAV-Based FSO/CV-QKD System Employing DP-QPSK/CD

Alshaer

Ismail

2022

IEEE Photonics J.

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Unmanned aerial vehicles (UAV) based on free-space optical (FSO) systems combine the benefits of both the high data rate of the FSO and the mobility of UAV. However, cumulative effects of laser beam divergence and turbulence-induced fading on the received irradiance in the FSO link might allow an external eavesdropper located near the authorized receiver to break the transmission under certain conditions. Quantum key distribution (QKD) is a technique of secure communication that employs quantum mechanics-based cryptography principles. A combination of a continuous-variable quantum key distribution (CV-QKD) and Gaussian modulation of quantum coherent states (GMCS) enables a relatively secure communication system against collective attacks over FSO transmission links. However, the performance is restricted and degraded due to the influence of atmospheric turbulence and excess noise. This paper aims to evaluate the performance of a secured UAV-based FSO system utilizing prepare and measure CV-QKD protocol based on GMCS under collective attack in terms of quantum bit error rate (QBER), outage probability, and secret key rate (SKR) considering the impairments of the FSO channel, link budget, deviations in the position and attitude angles of the UAV, channel fluctuating transmittance, and excess noise. The system parameters, including transmit power, receiver's field-of-view, and beam divergence angle, are optimized to satisfy the system's design criteria of threshold-QBER = 10 −3 and threshold outage probability = 10 −2 . The proposed system tolerates boresight displacement up to 7 cm with the optimized values. The Closed-form expressions and analytical results are confirmed by Monte-Carlo simulations.

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Enhancing earth-to-satellite FSO system spectrum efficiency with adaptive M-ary PSK and SIMO in presence of scintillation and beam wander

Cited by 13 publications

References 21 publications

Low-complexity joint transmit diversity and adaptive modulation schemes for OGS-satellite FSO uplink

Low-complexity joint transmit diversity and adaptive modulation schemes for OGS-satellite FSO uplink

Performance analysis of adaptive transmission based on power control over atmosphere composite channel

Performance Evaluation and Security Analysis of UAV-Based FSO/CV-QKD System Employing DP-QPSK/CD

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