System analysis of smart gateways techniques applied to Q/V-band high throughput satellites

Rossi, T.; Maggio, Fabio; Sanctis, Mauro De; Ruggieri, M.; Falzini, S.; Tosti, M.

doi:10.1109/aero.2014.6836385

Cited by 27 publications

(8 citation statements)

References 14 publications

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“…The distance between the 3 Italian stations (about 500, 700, and 300 km for Spino d'Adda‐Roma, Tito Scalo‐Spino d'Adda, and Tito Scalo‐Roma, respectively) permit the study of the large space correlation of attenuation, quite important to dimension and design smart gateway systems . Figure shows an example of rain attenuation time series recorded in Tito Scalo and Spino d'Adda; it is evident that the decorrelation because of the large distance reduces drastically the simultaneous outage of the 2 stations.…”

Section: Propagation Resultsmentioning

confidence: 99%

“…The distance between the 3 Italian stations (about 500, 700, and 300 km for Spino d'Adda-Roma, Tito Scalo-Spino d'Adda, and Tito Scalo-Roma, respectively) permit the study of the large space correlation of attenuation, quite important to dimension and design smart gateway systems. [21][22][23][24] Figure 12 shows an example of rain attenuation time series recorded in Tito Scalo and Spino d'Adda; it is evident that the decorrelation because of the large distance reduces drastically the simultaneous outage of the 2 stations. In Italy, 3 ground stations have been installed and are acquiring the beacon signals: the 2 ASI main ground stations in Tito Scalo (Southern Italy) and Spino d'Adda (Northern Italy) and the La Sapienza-FUB station in Roma (Central Italy).…”

Section: Propagation Resultsmentioning

confidence: 99%

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The Alphasat Aldo Paraboni propagation experiment: Measurement campaign at the Italian ground stations

Riva

Luini

D’Amico

et al. 2018

Satell Commun Network

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Summary Terabit capacity and very high data rates are required for the near‐future broadband satellite communication systems, mainly for multimedia services. The increased capacity can be obtained by using the larger bandwidth available at higher frequency bands, like Ka and Q/V. However, severe detrimental atmospheric effects impair radio waves at these bands, which require the extensive use of fade mitigation techniques, such as link power control, site diversity, or on‐board adaptive power allocation. The Alphasat Aldo Paraboni propagation experiment was designed and supported by the Italian Space Agency, and implemented by the European Space Agency, to better characterize the atmospheric propagation channel at Ka band and Q band, to support the design of future satellite systems. In Italy, 3 ground stations have been installed and are acquiring the Alphasat beacon signals: the 2 ASI main ground stations in Tito Scalo (Southern Italy) and Spino d'Adda (Northern Italy) and the La Sapienza‐FUB station in Roma (Central Italy). The 3 stations cover quite distant locations in Italy, with different climatic characteristics. This paper describes the main features of the experimental setup in the above stations and presents some examples of measurements and results.

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Section: Propagation Resultsmentioning

confidence: 99%

Section: Propagation Resultsmentioning

confidence: 99%

The Alphasat Aldo Paraboni propagation experiment: Measurement campaign at the Italian ground stations

Riva

Luini

D’Amico

et al. 2018

Satell Commun Network

View full text Add to dashboard Cite

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“…The basic principle of the space diversity experiment is to identify optimal spatial rerouting of the radio path around the source of the fading [19].…”

Section: Communication Experimentsmentioning

confidence: 99%

“…Considering the cumulative distribution function (CDF) of attenuation for a link, two parameters can be used to evaluate the effectiveness of such a technique: the diversity improvement factor, defined as the ratio of the single-site and joint outage time percentage, at the same attenuation level, and the diversity gain, defined as the difference (decibels) between the single-site and joint attenuation values for the same time percentage [19].…”

Section: Figurementioning

confidence: 99%

“…The objective is to realize a feeder link diversity scheme. The system architecture is based on the use of some gateways (GWs) connected with a terrestrial fiber network so that it is possible to route feeder link data in a diversity manner to counteract deep fades on one (or more) gateway(s) [19], [26]. Two types of "diversity" approaches can be used in smart gateway techniques: C Microscale diversity: this technique is based on the use of two (or more) GWs located in different positions within the same feeder downlink spot beam (typically, the distance of separation is between a few kilometers to a few tens of kilometers); the two GWs operates with a mutually exclusive logic on the basis of the atmospheric conditions.…”

Section: Figurementioning

confidence: 99%

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Satellite communication and propagation experiments through the alphasat Q/V band Aldo Paraboni technology demonstration payload

Rossi

Sanctis

Ruggieri

et al. 2016

IEEE Aerosp. Electron. Syst. Mag.

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INTRODUCTIONCurrent high-throughput satellite (HTS) systems for broadbanddistributed user access are designed following two main concepts: C The use of Ka band radio frequency (RF) links both for the forward and for the return link; this choice is due to the congestion of lower frequency bands and to the relatively large bandwidth available in the Ka band. Moreover, the RF technology in the Ka band is mature [1], [2].C The use of multispot coverage: this technique is largely applied to increase the system throughput through frequency reuse and system reconfigurability [2], [3].HTS systems are dimensioned to support an aggregated total capacity (considering both forward and return links) of a tenth of a gigabit per second over a coverage area as large as Europe, with a single spot capacity of hundreds of megabits per second [3].As a matter of fact, HTSs still offer much less bandwidth per user with respect to the terrestrial broadband networks. To achieve very high throughput towards "terabit connectivity," bandwidth efficient modulation schemes have to be used [4], [5]. However, because there is a trade-off between bandwidth efficiency and power efficiency in modulation schemes, high bandwidth efficiency requires more transmission power that is a limited resource in satellite systems.Therefore, an important breakthrough is needed in terms of bandwidth availability. The Q/V band (40-50 GHz) seems to offer very promising perspectives, being unused for commercial systems and offering a large part of the spectrum allocated for satellite services [1]. In this frame, the medium-term HTS system architecture is based on the use of a Ka-band user link to maintain the user terminal compatibility with the current system and a Q/V band feeder link [4]- [7].This solution is particularly attractive for the following reasons:C The Q/V band spectrum allocated for fixed satellite service is very large, about 5 GHz of near-continuous bandwidth both for uplink and downlink.C The whole Ka-band spectrum (that is currently allocated both for feeder and user links of the HTS systems) will be available for user link, increasing the bandwidth allocated to the user segment. This will require a rethinking of International Telecommunication Union frequency allocation and a strong frequency coordination activity.It is well-known that the atmospheric propagation impairments at extremely high frequency (EHF) bands (30-300 GHz) are severe, not only when rain events occur but also in the presence of clouds. The EHF electromagnetic radiation that propagates through the atmosphere is subject to absorption, scattering, depolarization, and fast fluctuations of amplitude and phase (scintillation) that have to be carefully investigated. Moreover, some mitigation techniques have to be analyzed and properly tuned to realize an efficient transmission. To counteract rain fading effects, high static link margins can be considered to ensure a minimum service outage duration. However, setting large link margins is in contrast with technology limitations of s...

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Performance, cost analysis, and ground segment design of ultra high throughput multi‐spot beam satellite networks applying different capacity enhancing techniques

Katona

Clazzer

Shortt

et al. 2016

Satell Commun Network

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SUMMARYThere is an ever present demand for increasingly higher data rates in multi-spot beam satellite networks. This can be enabled, by shifting carrier frequencies to higher bands, such as the Q/V-band, where more bandwidth is available. Furthermore, the available bandwidth has to be used as efficiently as possible, which requires efficient capacity enhancing techniques. The present paper identifies and analyzes ground segment capacity enhancing techniques for ultra high throughput multi-spot beam satellite networks operating in Q/V-band in the feeder link and in Ka-band in the user link. The impact of several capacity enhancing techniques on system performance is analyzed using a realistic time step-based system simulator. Their impact on the ground segment costs is also analyzed. The examined capacity enhancing techniques are as follows: (i) reduced carrier spacing with adjacent channel interference cancellation; (ii) full frequency reuse with co-channel interference cancellation and scheduling; (iii) four different smart gateway diversity techniques and; (iv) employing optical feeder links as an alternative to radio frequency feeder links. The paper shows that these techniques are capable of improving system performance at the expense of an increase in cost related to the complexity and maturity of the applied capacity-increasing technique.

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System analysis of smart gateways techniques applied to Q/V-band high throughput satellites

Cited by 27 publications

References 14 publications

The Alphasat Aldo Paraboni propagation experiment: Measurement campaign at the Italian ground stations

The Alphasat Aldo Paraboni propagation experiment: Measurement campaign at the Italian ground stations

Satellite communication and propagation experiments through the alphasat Q/V band Aldo Paraboni technology demonstration payload

Performance, cost analysis, and ground segment design of ultra high throughput multi‐spot beam satellite networks applying different capacity enhancing techniques

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