Satellite systems for personal communications

Evans, J. V.

doi:10.1109/5.681367

Cited by 84 publications

(40 citation statements)

References 13 publications

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“…This field has both commercial and strategic relevance, because mobile satellite communications include maritime and aeronautical communications, as well as land-mobile services to any Earth zone with insufficient terrestrial communications. For the above reasons, this segment is facing a constant evolution towards higher throughput in more challenging scenarios and lower user fees [19][20]…”

Section: Mobile Communications By Satellitesmentioning

confidence: 99%

1945–2010: 65 Years of Satellite History From Early Visions to Latest Missions

et al. 2011

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Section: Mobile Communications By Satellitesmentioning

confidence: 99%

1945–2010: 65 Years of Satellite History From Early Visions to Latest Missions

et al. 2011

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“…This results in a large aperture for the satellite antenna as the aperture area is directly related to the peak gain achieved. This has been demonstrated in a number of mobile satellite systems that use large reflectors or sizable direct radiating phased arrays [Evans, 1998;Miller, 1998]. If a phased array is employed, a large number of radiating elements are needed to populate the aperture, and complex beam formers with high power and mass requirements are used [Schuss et al, 1999].…”

Section: Introductionmentioning

confidence: 99%

Antenna aperture size reduction using subbeam concept in multiple spot beam cellular satellite systems

Kıłıc

Zaghloul²

2009

Radio Science

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[1] Multiple beam configurations in satellite systems enable the reuse of frequency in beams separated by a sufficient distance to address bandwidth limitation issues. Phased array antennas can simultaneously produce a large number of spot beams directed toward specific areas and therefore are a natural platform for multiple-beam satellite communications. This paper discusses a method to generate a large number of spot or cellular beams for multiple-beam satellite systems using smaller apertures. The basic spot beam is divided into a number of smaller subbeams with lower crossover levels that operate within the same bandwidth as the spot beam. The frequency reuse configuration can be maintained, while the overall aperture size is reduced. The aperture reduction is shown to have little or no effect on the cochannel interference. The technique is applicable to all satellite orbits as well as high-altitude platforms.Citation: Kilic, O., and A. I. Zaghloul (2009), Antenna aperture size reduction using subbeam concept in multiple spot beam cellular satellite systems, Radio Sci., 44, RS3001,

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“…Satellite diversity is a feature already adopted in non geostationary satellite systems of the present generation, e.g. Globalstar and ICO [1], and is seriously considered for forthcoming generations, particularly in the framework of the Universal Mobile Telecommunications System (UMTS) [2].…”

Section: Introductionmentioning

confidence: 99%

Shadowing correlation assessment and modeling for satellite diversity in urban environments

Vázquez-Castro

Pérez-Fontán

Saunders

2002

Int. J. Satell. Commun.

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SUMMARYNon-geostationary orbit satellite networks have dynamic, yet deterministic topologies. This paper deals with the consequences of relying on the use of multiple visible satellites to improve availability with time/locations through satellite diversity techniques. The assumption of independent blockage events in two di!erent satellite-to-mobile links is generally not accurate and information on shadowing correlation should be taken into account in the assessment of availability. In this paper a shadowing correlation study for urban environments is presented and a model for the real environments, as well as for a generic urban environment is inferred. The model proposed here is simple and can be run on a computer. It also relates urban and constellation geometries thus allowing the identi"cation of those cases for which satellite diversity gain should be expected. As a result of this analysis and modelling, we present empirical analytical expressions describing positive correlation coe$cient as a function of satellite angular separation (azimuth and elevation). We also show that an angle exists above which correlation can be negative and satellite diversity can sensibly improve link availability.

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Satellite systems for personal communications

Cited by 84 publications

References 13 publications

1945–2010: 65 Years of Satellite History From Early Visions to Latest Missions

1945–2010: 65 Years of Satellite History From Early Visions to Latest Missions

Antenna aperture size reduction using subbeam concept in multiple spot beam cellular satellite systems

Shadowing correlation assessment and modeling for satellite diversity in urban environments

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