Medium earth orbit optical satellite communication networks: Ground terminals selection optimization based on the cloud‐free line‐of‐sight statistics

Lyras, Nikolaos K.; Efrem, Christos N.; Kourogiorgas, Charilaos I.; Panagopoulos, Athanasios D.

doi:10.1002/sat.1289

Cited by 12 publications

(4 citation statements)

References 28 publications

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“…Having a larger ground-station diversity is a widely adopted strategy to mitigate the cloud blockage disadvantage [20][21][22]. More specifically, in Reference [21], the objective was to maximize the transfer of data from a LEO satellite as the criterion to select the ground-stations.…”

Section: Ground-station Selectionmentioning

confidence: 99%

“…More specifically, in Reference [21], the objective was to maximize the transfer of data from a LEO satellite as the criterion to select the ground-stations. In Reference [22], the authors studied how to minimize the number of ground-stations within certain availability constraints of the network. In the state-of-theart study for this topic, Reference [19], an algorithm is proposed that achieves a better trade-off between network availability and computational complexity, when compared to conventional methods.…”

Section: Ground-station Selectionmentioning

confidence: 99%

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Review on Free-Space Optical Communications for Delay and Disruption Tolerant Networks

2021

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The increase of data-rates that are provided by free-space optical (FSO) communications is essential in our data-driven society. When used in satellite and interplanetary networks, these optical links can ensure fast connections, yet they are susceptible to atmospheric disruptions and long orbital delays. The Delay and Disruption Tolerant Networking (DTN) architecture ensures a reliable connection between two end nodes, without the need for a direct connection. This can be an asset when used with FSO links, providing protocols that can handle the intermittent nature of the connection. This paper provides a review on the theoretical and state-of-the-art studies on FSO and DTN. The aim of this review is to provide motivation for the research of an optical wireless satellite network, with focus on the use of the Licklider Transmission Protocol. The assessment presented establishes the viability of these networks, providing many examples to rely on, and summarizing the most recent stage of the development of the technologies addressed.

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Section: Ground-station Selectionmentioning

confidence: 99%

Section: Ground-station Selectionmentioning

confidence: 99%

Review on Free-Space Optical Communications for Delay and Disruption Tolerant Networks

2021

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“…Furthermore, the optimum selection of OGSs has become an interesting research topic nowadays. For example, GEO satellite systems have been examined in [7]- [12], MEO satellite networks have been analyzed in [13]- [15], and low-Earthorbit (LEO) satellite systems have been studied in [16]. All these approaches provide useful tools and optimization algorithms in order to design the ground segment of optical satellite networks.…”

Section: Introductionmentioning

confidence: 99%

Low-complexity optimization algorithm for ground network design in optical satellite networks

Efrem

Lyras

Kourogiorgas

et al. 2021

International Conference on Space Optics — ICSO 2020

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Free space optics (FSO) is considered a promising technology for satellite communications due to its various advantages over radio-frequency (RF) systems, such as higher throughput, lower energy consumption and smaller mass. Nevertheless, optical satellite communication systems are heavily affected by atmospheric impairments, mainly by clouds. In order to cope with cloud coverage, site diversity technique is employed at the expense of installing extra optical ground stations (OGSs). As a consequence, the interest in ground network optimization is rapidly increasing with the aim to guarantee a given service availability. In this paper, a low-complexity optimization algorithm for ground network design in optical geostationary (GEO) satellite systems is presented, taking into account the spatial correlation between sites. Specifically, the objective is to choose a group of candidate OGSs that minimizes the overall cost of the ground network and meets certain availability requirements for every time period (thus incorporating the temporal variability of cloud coverage). Moreover, an extension of the methodology to optical medium-Earth-orbit (MEO) satellite systems is provided. Lastly, the performance of the proposed algorithm is evaluated via numerical experiments.

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“…For cloud coverage, macrodiversity technique is employed where multiple optical ground stations (OGSs) constituting an optical ground station network (OGSN) are employed. 13,23,24 These stations are placed at cloud free areas with separation distance of order of hundreds of kilometers, so as the desired CFLOS probability of the whole network is achieved. 14,25 One of the main drawbacks of this approach is the cost of having several ground stations.…”

mentioning

confidence: 99%

Ground‐to‐GEO optical feeder links for very high throughput satellite networks: Accent on diversity techniques

Mengali

Kourogiorgas

Lyras

et al. 2020

Satell Commun Network

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This paper studies the use of optical feeder links in very high throughput satellites (VHTS) networks with emphasis on gateway diversity techniques to mitigate the inherent propagation losses in optical frequencies. Focusing on a GEO scenario, the paper considers a system-wide approach investigating various challenges of optical feeder links. These include transmission schemes amenable for transparent on-board processing, optical channel models taking into account blockage by clouds and fading caused by atmospheric turbulence in addition to complexity of on-board and on-ground processing. The channel models are then used to dimension the ground segment towards ensuring a given availability percentage (e.g., 99.9%). The channel model and payload complexity further influence the choice of link layer techniques used for counteracting fading due to atmospheric turbulence in the absence of blockage. An elaborate end-to-end simulator incorporating the proposed channel models capturing the nuances of various processing blocks like optical-electrical conversion is developed. The system performance results provide interesting insights and a framework for assessing the feasibility and advantages of optical feeder links in VHTS systems. K E Y W O R D Sanalog and digital transparent payloads, channel models, GEO networks, microdiversity and macrodiversity, optical feeder links, optical ground station network selection, optical received time series, optical SNR | INTRODUCTIONA key challenge towards future generation very high throughput satellites (VHTS) is the limited spectrum of about 2 GHz available in the Ka band (20/30 GHz). A potential solution for resolving this issue could be to move the feeder links from the Ka band to the Q/V band (40/50 GHz) 1-4 or even to the W band (70/80 GHz) 5 where bandwidths of up to 5 GHz are available. While this allows for the use of radio frequency (RF) domain expertise, the bandwidth available is limited compared with requirement estimates and the spectrum is also solicited in the emerging 5G paradigm. 6 Another revolutionary solution is to move the feeder link from RF frequencies to optical frequencies. [7][8][9] Both these approaches are challenging due to the attenuation by atmospheric phenomena (e.g., rain and clouds) whose severity increases with the frequency. In both cases, a network of multiple gateways with smart switching capabilities is thus envisaged. 10,11 While RF at high frequencies is less impaired than the optical counterpart, larger number of gateways is nonetheless required to achieve very high throughputs due to the limited available bandwidth per

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Medium earth orbit optical satellite communication networks: Ground terminals selection optimization based on the cloud‐free line‐of‐sight statistics

Cited by 12 publications

References 28 publications

Review on Free-Space Optical Communications for Delay and Disruption Tolerant Networks

Review on Free-Space Optical Communications for Delay and Disruption Tolerant Networks

Low-complexity optimization algorithm for ground network design in optical satellite networks

Ground‐to‐GEO optical feeder links for very high throughput satellite networks: Accent on diversity techniques

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