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pierredv : v-band   6

This paper provides the results of studies in order to assess the sharing conditions between Fixed Satellite Service (FSS) and High Altitude Platform Stations (HAPS) in the same operational frequency bands. To characterize interference phenomena between the two systems carrier to interference (C/I) ratios are evaluated. Simulation results under the scenario of a realistic deployment of HAPS and the use of different satellite configurations are presented. An interesting result derived from the simulations is that FSS/GSO Earth Stations and HAPS ground stations may coexist in the HAPS coverage area under certain considerations. arrive at a satisfactory long term environment. The efficient utilization of the same spectrum is of great importance due to the scarce resources of it. Taking into consideration the fact that the allocation of the fixed-satellite service in the bands 47.2-50.2 GHz for Earth-to-Space transmission is more important than that in the 37.5-39.5 GHz band in order to accommodate feeder links to broadcasting satellites and that the 47/48 GHz band is the unique allocation of HAPS fixed service in Europe, this paper investigates the requirements and criteria of the two systems in order to operate in the same frequency bands in an non-interference basis and discusses as well the most important operational parameters that have an impact on the interference calculations. At first the potential interference caused by HAPS platform directing to the geostationary satellite receiver is examined. To characterize interference phenomena between the two systems carrier to interference (C/I) ratios are evaluated and the interference values are compared with the maximum permissible interference powers for the proper operation of the Fixed Satellite System. The same procedure is followed for the examination of the interference paths from FSS earth stations to HAPS ground stations. The first section introduces a typical HAPS-based FS system in V-band while the second describes the operational technical characteristics of GSO/FSS systems plaaned for the 40/50 GHz band. The last section of this paper gives a detailed description of the potential interference between HAPS and FSS systems and summarizes the results of the interference analysis
FSS  FS  HAPS  interference  V-band  GSO  satellite 
september 2017 by pierredv
From Boeing to SpaceX: 11 companies looking to shake up the satellite space | FierceWireless
"Companies filed with the FCC last year to launch 8,731 non-geostationary orbit (NGSO) communications satellites, according to Parabolic Arc. Not all of them are proposing to connect the unconnected to the internet; some are geared toward IoT and others are looking at serving the space industry. Performance is expected to be far better than previous satellite generations, with fiberlike speeds and lower latency."
FierceWireless  satellite  NGSO  FCC  OneWeb  SpaceX  ViaSat  SpaceNorway  LeoSat  Karousel  Audacy  Theia  Boeing  O3b  Ku-band  Ka-band  V-band  Kepler  Telesat  * 
august 2017 by pierredv
Boeing's LEO constellation hinges on V-band's viability -
"Since filing its license last summer with the U.S. Federal Communications Commission for a constellation of broadband communications satellites, Boeing has focused on developing some of the project’s key technologies, Bruce Chesley, vice president and program manager for Boeing’s Global Broadband Systems, told reporters at a March 7 press briefing."

"Boeing plans to draw on its commercial and military satellite experience to mitigate the rain attenuation that can degrade V-band transmissions. "
Boeing  NGSO  satellite  V-band  SpaceNews 
june 2017 by pierredv
FCC gets five new applications for non-geostationary satellite constellations - March 2017
Boeing: “1,396 to 2,956 low-Earth orbit (LEO) satellites for providing connectivity”

SpaceX: VLEO, “V-band low-Earth orbit (LEO) constellation of 7,518 satellites to follow the operator’s initially proposed 4,425 satellites that would function in Ka- and Ku-band”

Telesat: “V-band LEO constellation as one that “will follow closely the design of the Ka-band LEO Constellation,” also using 117 satellites (not counting spares) as a second-generation overlay.”

Theia: “use V-band frequencies for gateways on the ground that would have originally only used Ka-band. The company wants to operate a constellation of satellites for both communications and remote sensing, and claims that because its spacecraft will have “regenerative” payloads, that “there is no specific relationship between V-band uplink frequency bands and downlink frequency bands.””

OneWeb: “operate a “sub-constellation” of 720 LEO V-band satellites at 1,200 kilometers, and another constellation in Medium Earth Orbit (MEO) of 1,280 satellites. Added together, that expands the OneWeb constellation by 2,000 satellites”

O3b: “up to 24 additional satellites that would operate in a circular equatorial orbit as a constellation called O3bN”
FCC  satellite  NGSO  v-band  Boeing  SpaceX  Telesat  Theia  O3b  OneWeb  SpaceNews 
june 2017 by pierredv
Boeing proposes big satellite constellations in V- and C-bands - June 2016
"Boeing wants U.S. and international regulators to relax constraints on low-orbiting satellite broadband constellations using C- and V-band and has specifically asked for a license to launch and operate a network of 1,396-2,956 V-band satellites."

"Boeing proposes a constellation of between 1,396 and 2,956 V-band satellites in 35-74 orbital planes at 1,200 km in altitude. Each satellite's footprint would be subdivided into thousands of 8-11-km-diameter cells, with each cell using up to 5 GHz of bandwidth. Boeing also wants regulators to clear the way for a mega-constellation in C-band, athough Boeing is not planning its own C-band constellation."

"The company outlines its network’s features for orbital debris mitigation, both in terms of how the satellites would be designed to withstand debris impact and how they would be removed from orbit on retirement."

"Allison’s principal argument is that current power limits on C- and V-band satellite networks were set more than a decade ago, when a proposed highly elliptical orbit constellation was in planning. The network was never built, but the regulations remained in force. Boeing’s proposed V-band network, like its C-band proposal, is for constellations in circular orbit, which the company says poses less of a threat to satellites broadcasting the same frequencies from geostationary orbit over the equator than would a highly elliptical orbit."

"As is true of most satellite broadband systems being designed, Boeing’s C- and V-band networks would feature intense reuse of the broadcast frequencies. For the V-band network, the company says each satellite’s beams would be subdivided into thousands of cells, each 8-11 kilometers in diameter and each carrying up to five 1-gigahertz channels."

"The company is asking the FCC to modify eight of its rules to permit the system’s development. For example, the FCC’s equivalent power flux density limits are stricter than the ITU’s; Boeing asks that the U.S. regulator raise its limits."
Boeing  satellite  NGSO  SpaceNews  V-band 
june 2017 by pierredv
Boeing seeks permission to launch satellite constellation in same V-band spectrum as 5G systems - FierceWirelessTech
"Boeing last week filed an application with the FCC to launch and operate a geo-stationary satellite orbit (NGSO) fixed satellite service (FSS) system operating in low Earth orbit (LEO) in the 37.5-42.5 GHz, 47.2-50.2 and 50.4-52.4 GHz bands, collectively known as the V-Band. In so doing, it's putting its hat into the same ring as companies like SpaceX and OneWeb."
"Boeing's application said its NGSO system would consist of a total constellation of 2,956 NGSO FSS satellite to provide very high speed, low latency internet connectivity for user terminals via the system's network access gateways and associated terrestrial fiber network. "
Boeing  V-band  SpaceX  OneWeb  NGSO  FSS  FierceWireless 
june 2016 by pierredv

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