Reconfiguration Modeling of Reconfigurable Hybrid FSO/RF Links

Moradi, Hassan; Falahpour, Maryam; Refai, Hazem H.; LoPresti, Peter G.; Atiquzzaman, Mohammed

doi:10.1109/icc.2010.5501780

Cited by 8 publications

(10 citation statements)

References 10 publications

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“…The fading coefficient h is chosen to normalize E[h] and will be referred to as the normalized irradiance. Recalling a lognormal distribution for normalized irradiance h by (5), the probability of a link being either obscured or too noisy is expressed in terms of stationary probabilities and can be rewritten by [6] …”

Section: B Fading Modelsmentioning

confidence: 99%

“…The probability of an obscured link or excessive noise at time n is expressed in terms of stationary probabilities. Using [6,Eq. (14)], the closed-form expression of reconfiguration probability will be given by…”

Section: B Fading Modelsmentioning

confidence: 99%

“…Additional analysis regarding reconfiguration statistics is available in [6]. The channel model can be defined as a threestate Markov chain at any time n (4) …”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

On the Capacity of Hybrid FSO/RF Links

Moradi

Falahpour

Refai

et al. 2010

2010 IEEE Global Telecommunications Conference GLOBECOM 2010

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Hybrid Free Space Optics (FSO)/Radio Frequency (RF) communication systems have emerged as a way to improve network performance by providing enhanced availability and reliability. In an effort to mitigate individual drawbacks in the optical link during adverse weather conditions, network traffic flows simultaneously between channels. Based on the Shannon-Hartley theorem, channel capacity is dependent, among others, on both the signal to noise ratio (SNR) and channel bandwidth. As such, combined link throughput may be affected by channel state conditions. Because atmosphere turbulence can be modeled as a time-varying fading channel, capacity analysis can be investigated. In this paper, authors apply various availability scenarios of channel state information (CSI) on the optical link to derive closed-form expressions for combined link capacity. Numerical simulation provides a comparison to the results.Keywords-Hybrid FSO/RF link, channel capacity, channel state information (CSI), reconfiguration, and lognormal fading.

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Section: B Fading Modelsmentioning

confidence: 99%

Section: B Fading Modelsmentioning

confidence: 99%

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On the Capacity of Hybrid FSO/RF Links

Moradi

Falahpour

Refai

et al. 2010

2010 IEEE Global Telecommunications Conference GLOBECOM 2010

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“…Our study therefore focuses on the switchover systems, and we presume that the FSO link is favourable due to the fact that it potentially has higher data rate, better energy efficiency, and the possibility to be compatible with fiber-optic systems. In the considered system, the RF link works as a standby backup connection, and traffic is switched to this link only when the primary FSO link is down [2], [8]- [11]. Previously proposed switchover systems were based on two fixed transmission modes.…”

Section: Introductionmentioning

confidence: 99%

“…Motivated by link adaptation schemes, which have been employed in RF wireless systems [12], [13], and recently introduced for FSO systems [14]- [16], we propose adaptive multi-rate (AMR) scheme for hybrid FSO/RF switchover systems, which jointly employs switching between two links and adaptive rate on each link. In particular, unlike conventional systems, which directly switch from a high data transmission rate of FSO link to a lower rate of RF link when FSO channel quality degrades [2], [8]- [11], the proposed system gradually reduces data rate in FSO link, and only switches to RF link in the worst scenario. When the system works on the RF link, transmission rate is also chosen according to the RF channel states.…”

Section: Introductionmentioning

confidence: 99%

Adaptive Multi-Rate Designs and Analysis for Hybrid FSO/RF Systems over Fading Channels

Vuong

Pham

2015

IEICE Trans. Commun.

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This paper proposes the concept of adaptive multi-rate (AMR), which jointly employs switching between two links and adaptive rate on each link, for hybrid free-space optical/radio-frequency (FSO/RF) systems. Moreover, we present the cross-layer design of AMR switching, which is based on both the physical and link layers with an automaticrepeat request (ARQ) scheme. We develop an analytical framework based on a Markov chain model for system performance analysis. System performance metrics, including frame-error rate, goodput and link switching probability, are analytically studied over fading channels. Numerical results quantitatively show how the proposal significantly outperforms conventional ones with physical layer-based design and/or fixed-rate switching operation. key words: hybrid FSO/RF, turbulence channel, automatic-repeat request (ARQ), adaptive multi-rate (AMR)

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Optical Communication in Space: Challenges and Mitigation Techniques

Kaushal

Kaddoum

2017

IEEE Commun. Surv. Tutorials

1,204

721

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Abstract-In recent years, free space optical (FSO) communication has gained significant importance owing to its unique features: large bandwidth, license free spectrum, high data rate, easy and quick deployability, less power and low mass requirements. FSO communication uses optical carrier in the near infrared (IR) band to establish either terrestrial links within the Earth's atmosphere or inter-satellite/deep space links or ground-to-satellite/satellite-to-ground links. It also finds its applications in remote sensing, radio astronomy, military, disaster recovery, last mile access, backhaul for wireless cellular networks and many more. However, despite of great potential of FSO communication, its performance is limited by the adverse effects (viz., absorption, scattering and turbulence) of the atmospheric channel. Out of these three effects, the atmospheric turbulence is a major challenge that may lead to serious degradation in the bit error rate (BER) performance of the system and make the communication link infeasible. This paper presents a comprehensive survey on various challenges faced by FSO communication system for ground-to-satellite/satellite-to-ground and inter-satellite links. It also provide details of various performance mitigation techniques in order to have high link availability and reliability. The first part of the paper will focus on various types of impairments that pose a serious challenge to the performance of optical communication system for ground-to-satellite/satellite-to-ground and inter-satellite links. The latter part of the paper will provide the reader with an exhaustive review of various techniques both at physical layer as well as at the other layers (link, network or transport layer) to combat the adverse effects of the atmosphere. It also uniquely presents a recently developed technique using orbital angular momentum for utilizing the high capacity advantage of optical carrier in case of space-based and near-Earth optical communication links. This survey provides the reader with comprehensive details on the use of space-based optical backhaul links in order to provide high capacity and low cost backhaul solutions.

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Reconfiguration Modeling of Reconfigurable Hybrid FSO/RF Links

Cited by 8 publications

References 10 publications

On the Capacity of Hybrid FSO/RF Links

On the Capacity of Hybrid FSO/RF Links

Adaptive Multi-Rate Designs and Analysis for Hybrid FSO/RF Systems over Fading Channels

Optical Communication in Space: Challenges and Mitigation Techniques

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