Stochastic Geometry-Based Analysis of LEO Satellite Communication Systems (original) (raw)
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User selection for multi-beam satellite channels: A stochastic geometry perspective
2016 50th Asilomar Conference on Signals, Systems and Computers, 2016
In this paper, we analyse the performance of multibeam satellite communication network where each beam is paired with a single user. Each beam is controlled by a gateway (GW) connected to the satellite via a return channel. We consider terrestrial interference from cellular base stations (BSs) also communicating with the users in the system. Base station (BS) locations are modelled as an independent Poisson point process (PPP). We employ stochastic geometry tools to characterize the terrestrial interference. We also analyse the system based on the random user and the best user selection criteria. Finally, we analyse the coverage probability of the network and validate them with simulation results. Our results show the impact of terrestrial interference on satellite communication and that the best user selection can increase the coverage probability of such systems.
Network planning, analysis and design are an iterative process aimed at ensuring that a new network service meets the needs of subscribers and operators. During the initial start-up phase, coverage is the big issue and coverage in telecommunications systems is related to the service area where a bare minimum access in the wireless network is possible. In order to guarantee visibility of at least one satellite above a certain satellite elevation, more satellites are required in the constellation to provide Global network services. Hence, the aim of this paper is to develop wide area network coverage for sparsely distributed earth stations in the world. A hybrid geometrical topology model using spherical coordinate framework was devised to provide wide area network coverage for sparsely distributed earth stations in the world. This topology model ensures Global satellite continuous network coverage for terrestrial networks. A computation of path lengths between any two satellites put in place to provide network services to selected cities in the world was carried out. A consideration of a suitable routing decision mechanism, routing protocols and algorithms were considered in the work while the shortest paths as well as the alternate paths between located nodes were computed. It was observed that a particular satellite with the central angle of 27° can provide services into the diameter of the instantaneous coverage distance of 4081.3 Km which is typical of wide area network coverage. This implies that link-state database routing scheme can be applied, continuous global geographical coverage with minimum span, minimum traffic pattern and latency are guaranteed. Traffic handover rerouting strategies need further research. Also, traffic engineering resources such as channel capacity and bandwidth utilization schemes need to be investigated. Satellite ATM network architecture will benefit and needs further study.
Spatial availability in satellite-to-indoor broadcasting communications
Proc. 7th Workshop …, 2006
With high power broadcasting satellites becoming technically feasible, satellite-to-indoor propagation has drawn increasing interest. This contribution investigates the spatial availability of satellite links inside rooms in particular in an office environment. The ...
Performance Analysis of LEO Satellite Networks
Lecture Notes in Computer Science, 2002
We present an analytical model for computing call blocking probabilities in a LEO satellite network that carries voice calls. Both satellite-fixed and earth-fixed constellations with inter-orbit links and hand-offs are considered. The model is analyzed approximately by decomposing it into sub-systems. Each sub-system is solved in isolation exactly using a Markov process, and the individual results are combined together through an iterative method. Numerical results demonstrate that our method is accurate for a wide range of traffic patterns.
Stochastic geometry (SG) has been extensively used to model cellular communications, under the assumption that the base stations (BS) are deployed as a Poisson point process in the Euclidean plane. This has spawned a huge number of articles over the past years for different scenarios, culminating in an equally huge number of expressions for the coverage probability in both the uplink (UL) and downink (DL) directions. The trouble is that those expressions include the BS density, lambda\lambdalambda, which we prove irrelevant in this article. We start by developing a SG model for a baseline cellular scenario, then prove that the coverage probability is independent of lambda\lambdalambda, contrary to popular belief.
2021
Stochastic geometry (SG) has been extensively used to model cellular communications, under the assumption that the base stations (BS) are deployed as a Poisson point process in the Euclidean plane. This use has spawned a huge number of articles over the past years for different scenarios, culminating in an equally huge number of expressions for the coverage probability in both the uplink (UL) and downink (DL) cellular directions. The problem is that those expressions include the BS density, λ , which we prove irrelevant in this article. We start by developing a SG model for a baseline cellular scenario, then prove that its coverage probability is independent of λ , contrary to popular belief.
The Coverage Analysis for Low Earth Orbiting Satellites at Low Elevation
International Journal of Advanced Computer Science and Applications, 2014
Low Earth Orbit (LEO) satellites are used for public networking and for scientific purposes. Communication via satellite begins when the satellite is positioned in its orbital position. Ground stations can communicate with LEO satellites only when the satellite is in their visibility region. The duration of the visibility and the communication vary for each LEO satellite pass over the station, since LEO satellites move too fast over the Earth. The satellite coverage area is defined as a region of the Earth where the satellite is seen at a minimum predefined elevation angle. The satellite's coverage area on the Earth depends on orbital parameters. The communication under low elevation angles can be hindered by natural barriers. For safe communication and for savings within a link budget, the coverage under too low elevation is not always provided. LEO satellites organized in constellations act as a convenient network solution for real time global coverage. Global coverage model is in fact the complementary networking process of individual satellite's coverage. Satellite coverage strongly depends on elevation angle.
Spatio-Temporal Availability in Satellite-to-Indoor Broadcasting
2007 European Conference on Wireless Technologies, 2007
This contribution studies the spatio-temporal availability of satellite links inside typical indoor environments. The spatio-temporal satellite-to-indoor channels are obtained by a 3D ray tracing engine and by a geometry-based channel modeling tool. In this paper the temporal fluctuations of the channels have been modeled based on satellite-to-indoor measurements. Here the performance of single as well as multiple receive antennas with different polarimetric radiation patterns are compared for different satellite elevation angles. The results show that additional antennas placed at the receiver reduce both the spatial and temporal variability of the received power, leading to a significant reduction in transmit power necessary for the same target availability.
Padé approximation for coverage probability in cellular networks
2014 12th International Symposium on Modeling and Optimization in Mobile, Ad Hoc, and Wireless Networks (WiOpt), 2014
Coverage probability is one of the most important metrics for evaluating the performance of wireless networks. However, the spatial stochastic models for which a computable expression of the coverage probability is available are restricted (such as the Poisson based or α-Ginibre based models). Furthermore, even if it is available, the practical numerical computation may be time-consuming (in the case of α-Ginibre based model). In this paper, we propose the application of Padé approximation to the coverage probability in the wireless network models based on general spatial stationary point processes. The required Maclaurin coefficients are expressed in terms of the moment measures of the point process, so that the approximants are expected to be available for a broader class of point processes. Through some numerical experiments for the cellular network model, we demonstrate that the Padé approximation is effectively applicable for evaluating the coverage probability. Recently, the spatial models for cellular networks such that the wireless base stations (BSs) are deployed according to the Ginibre point process or its variants, α-Ginibre processes, are proposed and analyzed (see [6]-[8]). The Ginibre point process is one of the determinantal point processes and is used to account for the repulsion between particles (see, e.g., [9]-[11]). However, while the computable expressions of the coverage probability are available for the Ginibre based models, they may suffer from the time-consuming numerical computation (particularly, in the case of α-Ginibre based models).
IEEE Transactions on Vehicular Technology, 2006
In this paper, the authors develop an analytical model to study the performance of a mobile low earth orbiting (LEO) satellite cellular network. The model assumes that the call duration has a gamma distribution and considers the effect of system parameters such as the number of channels per cell, the number of channels reserved for the handoff, and the cell residence time, on the teletraffic performance of the system. The quality of service (QoS) measures studied in this paper include new call blocking probability, handoff failure probability, premature call-termination probability (CTP), and call dropping probability (CDP). Based on the causal central limit theorem, the authors use a twoparameter gamma distribution to approximate the distribution of the sum of the residence times in the cells. The analytical model presented in this paper may be used with any call-holding-time distribution. The analytical results are validated by a computer simulation. Index Terms-Call dropping probability (CDP), handoff failure, new call blocking probability, premature call-termination probability (CTP). I. INTRODUCTION R ECENT advances in technology make it possible to use satellite networks as the backbone for wireless personal communication services (PCS) to meet third generation (3G) requirements of providing services anywhere and at any time. While fewer numbers of geostationary satellites are needed to cover the globe than low earth orbiting (LEO) satellites, a geostationary satellite network has larger propagation delays and requires more power for transmission (implying heavier portable devices due to larger battery sizes) than that experienced in LEO satellite networks. As a result, LEO satellites are better suited for use in 3G cellular networks than geostationary satellites. In an LEO satellite communication system, the speed of the satellite is very high (approximately 26 000 km/h) compared to the speed of users on earth [1]. Therefore, in the performance analysis of mobile LEO satellite cellular networks, the speed of the user is usually ignored and the velocity and motion in such systems are assumed to be due solely to the deterministic motion of the LEO satellite. In PCS networks that are based on LEO satellites, a frequency reuse technique similar