A geometric model that describes a multipath propagation for a fixed wireless communication system between a High Altitude Platform and a fixed terrestrial user is presented. The model describes the propagation of the reflected signals that are able to reach the receiver as a consequence of all the scatterers located inside the system coverage area. The establishment of a particular geometry characterizing the system coverage area allows the behavior of the multipath phenomenon effects to be modeled accurately.
The High Altitude Platforms Stations (HAPS) represent one attractive option today for telecommunications applications. In the evaluation of these systems are necessary channel models to obtain the performance of them. In this paper, a statistical switched broadband channel model and a channel model based on time series generator are postulated and analyzed by simulation, representing several conditions related with the coverage and environmental conditions.
Increase on the demand of the telecommunications services is related with systems based on different technological alternatives. One of them, that is being developed in the last years is the use of aircrafts or airships technologies. The High Altitude Platforms Stations (HAPS) represent one attractive option today. In this paper, a statistical switched broadband channel model is postulated and analyzed by simulation and several conditions related with the coverage and environmental conditions are analyzed. A system model is postulated and evaluated considering different coded signals transmitted on the channel model proposed. Index terms. HAPS, broadband switched channel. I.-INTRODUCTION. This paper presents a statistical switched broadband channel model for digital transmission in HAPS link. Performance results were obtained by simulation. In section II are presented some ideas related with HAPS and signal fluctuations. A switched channel model based on semiMarkovian process is presented in section III. A broadband channel model is proposed in section IV. Finally, results and conclusions obtained are shown in sections V and VI respectively. II.-HAPS (High Altitude Platforms Stations).A.-Systems based on HAPS. Figure No.1 Coverage areas in systems based on HAPS.In a system based on HAPS the platform is positioned above the ground for radioelectric coverage area, at a height between 21 and 25 km. There are three areas: Urban (UAC), Suburban (SAC) and Rural (RAC) which are determined by the position of the receiver (the elevation angle and the distance from the subplatform point, SPP). These areas are shown in Figure No.1.The systems based on HAPS represents a technological alternative that is being developed in last years; these systems could have many advantages of both terrestrial and satelite systems, while at the same time avoiding many of the pitfalls [1][2]. The ITU-R, in the Recommendation F-1500 [3] defines the technical and operational characteristics of fixed services using HAPS. In a system based on HAPS, the communication between the platform and a number of a gateways stations on the ground located in the UAC or SAC areas, provide interconnection with the fixed telecomunication networks.A system based on HAPS links will allow to obtain a better quality of the signal, due that most of the transmission time the system guarantees a LOS condition, diminishing the shadowing effect in comparison with the terrestrial system and also has a less delay with regard to the satelite systems.B.-Probability density models for the signal fluctuations.The first step toward a meaningful channel model is to identify typical scenarios. We will restrict that mentioned by the ITU-R in the Recommendation P.681-6 [8].In a system based on HAPS, there are a LOS condition and difusse multipath components in the Urban area. The LOS condition is due to the short distance from the platform to the receiver on the ground; the difusse component consists of many reflections from the obtacles in the area, each of them being independent...
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