Interference between Satellite Communication Systems and Common Carrier Surface Systems

Curtis, H. E.

doi:10.1002/j.1538-7305.1962.tb00483.x

Cited by 16 publications

(4 citation statements)

References 8 publications

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“…Figure 4 also shows that, beyond the horizon, tropospheric interference would be a minor problem were it not for its variability or for possible path antenna gain. In fact, Curtis [1962] showed that line-of-sight separations are sometimes adequate in low-sidelobe directions. Hartman and Decker [ 1961 ] curves, shows median transmission loss versus frequency and elevation angle + of an antenna beam of constant beamwidth (5 mr at 3 db), the second antenna being isotropic.…”

Section: Calculated Resultsmentioning

confidence: 99%

“…, but also on often inadequately defined or agreed upon criteria of acceptability. At least two methods [Firestone, Lutz, and Smith, 1962;Curtis, 1962 ] have been used to determine transmission loss requirements and consequent smooth-earth separation distances. In general, such losses should exceed, for 99.9% of the hourly medians in a year, values in the 150to 180-db range, based on presently probable system characteristics.…”

Section: Transmission Loss Requirements For Interference Protectionmentioning

confidence: 99%

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Antenna beam elevation angle for control of tropospheric interference between space system earth terminals and terrestrial stations

Lutz¹

1963

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High gain antennas, sensitive receivers and high power transmitters which are used at the earth stations of space communications systems complicate the problem of sharing frequencies with other surface services. However, because of the dependence of beyondthe-horizon tropospheric propagation on the scattering angle, it is possible to offset the gain of the terminal antenna by elevating the beam, Early studies of frequency-sharing assumed that the beam of the earth station was elevated "sufficiently" to increase the transmission loss to that which would be obtained if the actual antenna were replaced by an isotropic antenna. This paper studies the question of what constitutes a "sufficient" elevation angle, as described above, for the particular conditions of a smooth earth, 30-foot antenna heights and several combinations of antenna sizes. Some results are also given when there is an elevated horizon at the earth terminal end of the path.1.

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Section: Calculated Resultsmentioning

confidence: 99%

Section: Transmission Loss Requirements For Interference Protectionmentioning

confidence: 99%

Antenna beam elevation angle for control of tropospheric interference between space system earth terminals and terrestrial stations

Lutz¹

1963

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“…The literature discusses many aspects of co-channel interference including spread spectrum interference reduction [1], network interference with omnidirectional antennas [2], interference cancellation equipment [3][4], distortion caused by interference [5][6], and avoidance of used spectrum in a given area [7][8]. However, this paper focuses on determining the geographical footprint in which a service provider base station (BS) and subscriber stations (SS) can be located and share the spectrum but not interfere with an existing system.…”

Section: Introductionmentioning

confidence: 99%

Spectrum sharing for directional systems

Trajkov

Evans

Roberts

2006

Proceedings of the First International Workshop on Technology and Policy for Accessing Spectrum - TAPAS '06

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Dynamic spectrum access systems will need to simultaneously share the same frequency band with existing systems, particularly in initial deployments. In the case of directional systems, this can be accomplished through spatialdivision-multiple-access (SDMA), by taking advantage of the directionality of the antennas involved and the location of the transmit and receive antennas to avoid interference. This paper describes a methodology for determining the region in which transmit and receive antennas can be located to avoid interference. An example involving a satellite downlink antenna and a broadband wireless access system using directional antennas is presented.

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“…After considerable study, 3 and consultation with various foreign communication agencies, it was concluded that for a start it was most practical to share frequencies with the point-to-point, common carrier microwave relay systems. These are the frequency bands 3700-4200 me and 5925-6425 me, It was decided to use the 4000-mc band for the down direction, from satellite to ground, so as to minimize the deleterious effectsof rain on the eceived signal and noise.…”

mentioning

confidence: 98%