Performance analysis of amplify and forward parallel relaying free-space optical system over M distribution

Wang, Yi; Du, Wenqi

doi:10.1117/1.oe.59.7.076102

Cited by 3 publications

(4 citation statements)

References 23 publications

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“…In multi-hop FSOC systems, decode-and-forward (DF) relay [18,19] and amplify-andforward (AF) relay [20,21] are two commonly used relay technologies. The DF scheme decodes and re-encodes the received signal at each relay node and then forwards it to the next node.…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of Multi-Hop FSOC over Gamma-Gamma Turbulence and Random Fog with Generalized Pointing Errors

Chang,

Liu,

Yao

et al. 2023

Photonics

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The multi-hop amplify-and-forward free-space optical communication (FSOC) system is studied in random fog using the I-function, considering Gamma-Gamma atmospheric turbulence and Beckmann pointing error. Outage probability, average bit error rate and average ergodic channel capacity are obtained. Channel-state-information assisted relay performs better than fixed-gain relay under high transmitted power. Increasing the hop number significantly improves the performance. More hops are needed in medium fog than in light fog to achieve the same performance. In addition, on a single-hop link, the influence of fog channel on system performance is dominant, while atmospheric turbulence intensity, normalized jitter standard deviation and normalized boresight error have little effect on the system performance. However, on a multi-hop link, atmospheric turbulence intensity, normalized jitter standard deviation and normalized boresight error have serious effects on system performance. Compared with correcting the normalized boresight error, compensating the normalized jitter standard deviation greatly improves the multi-hop FSOC system performance. Furthermore, optimizing beam width can further improves the performance. To ensure good communication, the system should select a low-order modulation scheme.

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Section: Introductionmentioning

confidence: 99%

Performance Analysis of Multi-Hop FSOC over Gamma-Gamma Turbulence and Random Fog with Generalized Pointing Errors

Chang,

Liu,

Yao

et al. 2023

Photonics

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“…In a multi-relay system, parallel relays are employed between the transmitter and receiver, either with or without an existing direct link. This configuration was investigated in [16][17][18][19]. In these works, all the relays were active during transmission, which required precise synchronization between these relays.…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of Dual-Hop DF Multi-Relay FSO System with Adaptive Modulation

Alathwary,

Altubaishi

2023

Applied Sciences

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The signal quality in high-bandwidth free space optical (FSO) systems deteriorates due to atmospheric turbulence and pointing errors. Employing techniques such as adaptive transmission and relay selection (RS) can mitigate their effects. This paper analyzes the performance of a dual-hop decode-and-forward multi-relay FSO system with an adaptive M-ary phase shift keying scheme. This analysis is based on the recently proposed Fisher–Snedecor F channel model and considers the impact of pointing errors. We propose two partial relay selection schemes based on the source-to-relay or relay-to-destination channel state information to reduce the complexity of the optimal relay selection scheme. In this investigation, we derive closed-form expressions for the outage probability, modulation level selection probability, and spectral efficiency (SE) and compare the performance of the proposed RS schemes under balanced and unbalanced link cases. We observe an improvement in the SE with an increase in the number of modulation levels and the number of relays. Moreover, it is noted that the performance of the system can be restricted by the quality of either the source-to-relay or the relay-to-destination link, even if the quality of the other link is perfect. Finally, the outcomes obtained through the derived expressions are validated using Monte Carlo simulations.

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“…They also study multi-user channels which are modeled as a broadcast channel (downlink) or a multiple-access channel (uplink) and then they provide capacity bounds for the channels, but the exact capacity of the parallel relay channel is still unknown. In this paper, we use the max-flow min-cut bound [12] for the FSO system similar to [2,9].…”

Section: Introductionmentioning

confidence: 99%

“…However, despite their important advantages, the performance of terrestrial FSO systems are affected by atmospheric fading. Parallel relay networks are one of the ways to eliminate this defect in FSO systems [2]. One of the fundamental metrics to characterize the performance of an FSO system is the optimality of the diversity‐multiplexing tradeoff (DMT).…”

Section: Introductionmentioning

confidence: 99%

DMT analysis and optimal scheduling for FSO relaying communications

et al. 2021

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In this paper, two-hop parallel N -relay networks are considered and the diversitymultiplexing tradeoff (DMT) is derived over Gamma-Gamma free-space optical (FSO) channels with identical average received signal to noise rations in all links. In the derivations, both local and global channel state information (CSI) are investigated. In the local CSI case, the node only knows its incoming link conditions, while in the global CSI case, the nodes are aware of all the CSIs in the network. The listening and transmitting times at the relays as variables in the DMT derivation are further considered which are later used to optimize the performance of the network. It is demonstrated that the optimal DMT is obtained with the static quantize map and forward (SQMF) and dynamic quantize map and forward (DQMF) strategies for different ranges of the multiplexing gain. In addition, the optimal schedule of relays in the DQMF strategy is determined as a function of the local channel conditions in the relays. INTRODUCTIONFree-space optical (FSO) communication provides high channel bandwidth at low cost and inherent security using near-infrared (NIR) carrier frequencies in the optical band [1]. These benefits make FSO systems appealing for various applications in terrestrial and satellite communication links. However, despite their important advantages, the performance of terrestrial FSO systems are affected by atmospheric fading. Parallel relay networks are one of the ways to eliminate this defect in FSO systems [2]. One of the fundamental metrics to characterize the performance of an FSO system is the optimality of the diversitymultiplexing tradeoff (DMT). In [3], the authors introduce the DMT metric in an FSO system for Log-normal, Gamma-Gamma, and negative exponential channel models. Parallel relaying connects the source and the destination through several parallel sets of relays that are assumed to use orthogonal channels for relaying the information simultaneously [4,5]. Also, a direct link might exist based on the propagation conditions. Since the destination node receives the same data via multiple independent different paths, parallel relaying systems can enhance the reliability and/or capacity in FSO systems. This model of cooperative communications was presentedThis is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Performance analysis of amplify and forward parallel relaying free-space optical system over M distribution

Cited by 3 publications

References 23 publications

Performance Analysis of Multi-Hop FSOC over Gamma-Gamma Turbulence and Random Fog with Generalized Pointing Errors

Performance Analysis of Multi-Hop FSOC over Gamma-Gamma Turbulence and Random Fog with Generalized Pointing Errors

Performance Analysis of Dual-Hop DF Multi-Relay FSO System with Adaptive Modulation

DMT analysis and optimal scheduling for FSO relaying communications

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