Modelling of Interference Caused by Uplink Signal for Low Earth Orbiting Satellite Ground Stations (original) (raw)
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Interference analysis in satellite cellular systems
[1992 Proceedings] The Third IEEE International Symposium on Personal, Indoor and Mobile Radio Communications
In next generation satellite mobile systems very high spectrum efficiency will be a primary objective. High spectrum efficiency is often related to a significant amount of eo-channel andlor adjacent channel interference. Therefore, system design should in general include consideration of both interference and noise effects. Interference evaluation in a mobile salellite cellular system is different from the case of a terrestrial system due to the presence of the on-board antenna which acts as a spatial filter. The paper addresses the modeling of interference in single and multi-satellite cellular system and provides some results of the analysis.
International Journal of Satellite Communications and Networking, 2012
SUMMARYThis paper presents a compatibility analysis involving space research service lunar mission uplink transmissions and the inter‐satellite links of non‐geostationary orbit systems operating in the 22‐GHz band. Three points differentiate this analysis from the currently available studies: (1) the mathematical model used here allows for the consideration of the time varying nature of the inclination of the Moon orbital plane; (2) besides the usual unconditional interference cumulative distribution functions, this analysis also considers the conditional cumulative distribution functions given that the victim satellite is receiving interference, important to characterize the interference affecting users that, because of their location, are most of the time using satellites, which are under interference; and (3) instead of dynamic time simulation, the analytical method in Recommendation ITU‐R S.1529 is used to determine the various cumulative distribution functions involved. Four sc...
International Journal of Satellite Communications and Networking, 2015
An integrated mobile-satellite service (MSS) system is one of the most promising infrastructures for the efficient use of satellite frequency, and the satellite coverage can be extended by reusing the satellite frequency in its ground components. However, the co-channel interferences caused by the frequency reusing technique may lead to the performance degradation. This paper presents the interference analysis for an integrated MSS system that is composed of a multi-beam satellite, complementary ground components (CGCs), and mobile earth stations, by using statistical simulations. These statistical results are then used to evaluate the availability of the system. Our simulation results reveal that the satellite frequency reuse in the CGCs of the integrated MSS system can increase efficiency of satellite spectrum utilization with a tradeoff between CGC network capacity and intra-system interferences.
Some practical strategies for reducing intermodulation in satellite communications
IEEE Transactions on Aerospace and Electronic Systems, 1988
Various heuristic procedures for obtaining practical solutions to the general one-level carrier frequency assignment problem are described. The problem treated is general in the sense that it accommodates the case where L of the N slots may be explicitly designated as prohibited and unavailable for assignment. This problem occurs in satellite transmission with many small carriers accessing the same transponder where due to multipath and TV interference from crosspolarized transponders of the same satellite and from copolarized transponders of the adjacent satellites, some portions of the bandwidth of the considered transponder cannot be used. To permit comparison with respect to intermodulation (1M)advantage and central processing unit (CPU) time required, the case without prohibited slots is considered. The sequential insertion procedure in which, starting with two carriers at the two end slots, one additional carrier is optimally inserted at a time to one of the unassigned slots is found best when the ratio between the available bandwidth and the total carrier bandwidth is greater than about 125 percent. All the heuristic procedures produce assignments whose IM-advantages are all greater than the bandwidth ratio.
Radio Interference Modeling and Prediction for Satellite Operation Applications
Using Government drawings, specifications, or other data included in this document for any purpose other than Government procurement does not in any way obligate the U.S. Government. The fact that the Government formulated or supplied the drawings, specifications, or other data does not license the holder or any other person or corporation; or convey any rights or permission to manufacture, use, or sell any patented invention that may relate to them. This report is the result of contracted fundamental research deemed exempt from public affairs security and policy review in accordance with SAF/AQR memorandum dated 10 Dec 08 and AFRL/CA policy clarification memorandum dated 16 Jan 09. This report is available to the general public, including foreign nationals. Copies may be obtained from the Defense Technical Information Center (DTIC) (http://www.dtic.mil).
IEEE Journal on Selected Areas in Communications, 1995
Several multisatellite and multispot systems have been recently proposed for provision of mobile and personal services with global coverage, adopting GEO or non-GEO (i.e., MEO, LEO) satellite constellations. The paper addresses an indepth analysis of these constellations, evaluating both geometrical performance measures and cochannel interference levels caused by extensive frequency reuse. The geometrical analysis yields the statistics for coverage, frequency of satellite handovers , and link absence periods. The interference analysis is based on a general model valid for all access techniques, which is here applied to the case of FDMA. The outage probability as a function of the specification on carrier-to-interference power ratio is evaluated for four selected constellations. Several techniques are introduced for interference reduction in non-GEO systems, in which the satellites coverage areas may intersect: spot turnoff, intraorbital plane frequency division, and interorbital plane frequency division. The effects of Rice fading have also been analyzed by means of an analytic approximated method. The overall analysis allows a fair comparison between LEO, MEO, and GEO constellations.
Interference Analysis for on the Move Satellite Communication Systems
We consider on the move satellite systems with geostationary satellites. Using the antenna pointing distribution of Weerackody and Gonzalez, we derive tight upper and lower bounds on the interference to adjacent satellites from the on the move platforms. We then compute the distribution of the interference and the system outage probability. Simulation results are provided demonstrating that our estimates are very good.
Mitigating interference into communication satellites
2001 IEEE Aerospace Conference Proceedings (Cat. No.01TH8542), 2000
202-944-761 1 r o !~~! r t . !~m .~~~i . n~! s~~ i!lC .~h~!~~. ,~m r u . t !~.~~~i !~!~~.~~?~. i . n~ Abstract-This contribution outlines INTELSATs efforts to reduce interference in the INTELSAT space segment by implementing an Interference Management Program (IMP)
Interference in Cellular Satellite Systems
Satellite Communications, 2010
Since satellite systems are bandwidth limited, the subdivision of beams into smaller portions allow for frequency reuse to increase capacity. The available bandwidth is shared among these beams as depicted in Figure 1 for reuse factor of n.