Practical implementation and performance study of a hard-switched hybrid FSO/RF link under controlled fog environment

Lee, It Ee; Ghassemlooy, Zabih; Ng, Wai Pang; Gourdel, V.; Khalighi, Mohammad-Ali; Zvánovec, Stanislav; Uysal, Murat

doi:10.1109/csndsp.2014.6923856

Cited by 14 publications

(7 citation statements)

References 24 publications

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“…One can further calculate that the inequality λC R,i (b i ) > b i p i necessitates y(b i ) > p i r i /(λr i − p i ) when p i < λr i . Note that considering the definition of the source utility given in (16), if p i ≥ λr i , one has U i < 0 which against our condition of positive utility. Therefore, the constraint on the unit price p i < λr i has to be satisfied.…”

Section: A Utility Of Source and The Demand Functionmentioning

confidence: 89%

“…The so-called demand function refers to the spectrum demand that maximizes the utility function (16) when the spectrum price p i is given [35]. To establish a RF relay link S − R i − D, the optimization problem at S can be expressed as follows:…”

Section: A Utility Of Source and The Demand Functionmentioning

confidence: 99%

“…In [15], a low-complexity hard-switching hybrid RF/FSO system with both single-threshold and dual-threshold for FSO link operation is proposed. Besides the theoretical studies, several experimental works focusing on this type of hybrid link have also been reported [16]. Although switch-over hybrid RF/FSO link is simple and has also been employed in some commercial FSO products [3], the preallocation of RF spectrum to a backup link with occasional use is inherently spectrum-inefficient [17].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Game-Theoretic Spectrum Trading in RF Relay-Assisted Free-Space Optical Communications

Huang

Shah-Mansouri

Safari

2019

IEEE Trans. Wireless Commun.

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This work proposes a novel hybrid RF/FSO system based on a game theoretic spectrum trading process. It is assumed that no RF spectrum is preallocated to the FSO link and only when the link availability is severely impaired by the infrequent adverse weather conditions, i.e. fog, etc., the source can borrow a portion of licensed RF spectrum from one of the surrounding RF nodes. Using the leased spectrum, the source establishes a dual-hop RF/FSO hybrid link to maintain its throughout to the destination. The proposed system is considered to be both spectrum-and power-efficient. A marketequilibrium-based pricing process is proposed for the spectrum trading between the source and RF nodes.Through extensive performance analysis, it is demonstrated that the proposed scheme can significantly improve the average capacity of the system, especially when the surrounding RF nodes are with low traffic loads. In addition, the system benefits from involving more RF nodes into the spectrum trading process by means of diversity, particularly when the surrounding RF nodes have high probability of being in heavy traffic loads. Furthermore, the application of the proposed system in a realistic scenario is presented based on the weather statistics in the city of Edinburgh, UK. It is demonstrated that the proposed system can substantially enhance the link availability towards the carrier-class requirement. Index TermsFree-space optical communication, hybrid RF/FSO link, spectrum trading, market equilibrium.S. Huang and M. Safari are with the School

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Section: A Utility Of Source and The Demand Functionmentioning

confidence: 89%

Section: A Utility Of Source and The Demand Functionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Game-Theoretic Spectrum Trading in RF Relay-Assisted Free-Space Optical Communications

Huang

Shah-Mansouri

Safari

2019

IEEE Trans. Wireless Commun.

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“…Hard switching (HS) hybrid FSO/RF systems in which there is a parallel RF link acting as a backup have been proposed to address this draw-back of FSO systems. In this structure, transmitters and receivers switch to transmit on either FSO or RF link depending on the corresponding channel conditions [8] and [9]. A key point in HS schemes is when to switch between the optical and RF links for different visibility conditions to obtain the best transmission throughput [10].…”

Section: Introductionmentioning

confidence: 99%

Deployment of Hybrid FSO/RF Links in Backhaul of Relay-Based Rural Area Cellular Networks: Advantages and Performance Analysis

Enayati

Saeedi

2016

IEEE Commun. Lett.

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In this paper, we consider a rural area cellular framework in which a relay based free space optical (FSO) configuration is assumed for the backhaul. We assume orthogonal frequency division multiple access setting for both optical and radio frequency (RF) links. In this system, the rural users communicate with base station (BS) through several relays while the links between BS and relays are assumed to be hybrid FSO/RF. We then propose a resource allocation scheme to maximize the system throughput and compare the performance against a similar system that uses only an FSO link in the backhaul. Simulation results show that deploying hybrid FSO/RF communication considerably improves the performance. The improvement is more pronounced in foggy conditions. As far as the number of deployed relays to maintain a certain performance is concerned, we observe that a hybrid FSO/RF system needs considerably smaller number of relays, as few as half in our case, than an FSO system.

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“…Furthermore, we outline that the proposed reconfigurable antenna is valid for graphene-based Yagi-Uda antennas with more radiation patterns (i.e., 6-, 8-patterns and so on). Such antennas with high directionality (i.e., high gain) could be ideal for a number of applications including wireless sensor networks, 26 and the last mile access network employing hybrid free space optics and radio frequency technologies, 27 which offer improved link performance. Due to the advancement of the planar implementations, the graphene-metal hybrid implementation in Refs.…”

Section: Introductionmentioning

confidence: 99%

Graphene-based Yagi-Uda antenna with reconfigurable radiation patterns

Jiao

et al. 2016

AIP Advances

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This paper presents a radiation pattern reconfigurable Yagi-Uda antenna based on graphene operating at terahertz frequencies. The antenna can be reconfigured to change the main beam pattern into two or four different radiation directions. The proposed antenna consists of a driven dipole radiation conductor, parasitic strips and embedded graphene. The hybrid graphene-metal implementation enables the antenna to have dynamic surface conductivity, which can be tuned by changing the chemical potentials. Therefore, the main beam direction, the resonance frequency, and the front-to-back ratio of the proposed antenna can be controlled by tuning the chemical potentials of the graphene embedded in different positions. The proposed two-beam reconfigurable Yagi-Uda antenna can achieve excellent unidirectional symmetrical radiation pattern with the front-to-back ratio of 11.9 dB and the10-dB impedance bandwidth of 15%. The different radiation directivity of the two-beam reconfigurable antenna can be achieved by controlling the chemical potentials of the graphene embedded in the parasitic stubs. The achievable peak gain of the proposed two-beam reconfigurable antenna is about 7.8 dB. Furthermore, we propose a four-beam reconfigurable Yagi-Uda antenna, which has stable reflection-coefficient performance although four main beams in reconfigurable cases point to four totally different directions. The corresponding peak gain, front-to-back ratio, and 10-dB impedance bandwidth of the four-beam reconfigurable antenna are about 6.4 dB, 12 dB, and 10%, respectively. Therefore, this novel design method of reconfigurable antennas is extremely promising for beam-scanning in terahertz and mid-infrared plasmonic devices and systems.

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Practical implementation and performance study of a hard-switched hybrid FSO/RF link under controlled fog environment

Cited by 14 publications

References 24 publications

Game-Theoretic Spectrum Trading in RF Relay-Assisted Free-Space Optical Communications

Game-Theoretic Spectrum Trading in RF Relay-Assisted Free-Space Optical Communications

Deployment of Hybrid FSO/RF Links in Backhaul of Relay-Based Rural Area Cellular Networks: Advantages and Performance Analysis

Graphene-based Yagi-Uda antenna with reconfigurable radiation patterns

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