REPORT P.2145-2009

Model parameters for an urban environment for the physical-statistical wideband LMSS model in Recommendation ITU-R P.681-6


 

 

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标准号
REPORT P.2145-2009
发布日期
2009年06月01日
实施日期
2011年11月03日
废止日期
中国标准分类号
/
国际标准分类号
/
发布单位
ITU-R - International Telecommunication Union/ITU Radiocommunication Sector
引用标准
72
适用范围
Introduction The statistical data provided with the physical-statistical wideband land mobile satellite services (LMSS) channel model also named in this Report as the land mobile multipath channel model (LMSCM)@ was derived from measurement data recorded in a comprehensive high resolution channel sounding campaign in and around Munich in 2002. In this campaign different urban@ suburban and rural environments were measured for car and pedestrian applications. In these measurements the satellite of a potential navigation system was simulated by a Zeppelin NT. The Zeppelin transmitted the measurement signal between 1 460 and 1 560 MHz towards the ground using a hemispherical@ circular polarized@ antenna with 10W EIRP. The receiver was mounted in the measurement vehicle@ which was driven through the measurement area. In the case of the pedestrian measurement the antenna was carried by the walking user followed by the measurement vehicle. Based on this measurement data the LMSCM was developed. This model is a realistic high resolution deterministic-statistical model. A receiver can be moved through a synthetic environment with houses@ trees and lamp posts. These obstacles influence the LoS path. In addition reflectors are produced causing echo signals. The statistical part of the model comprises: ?C the house front@ tree and lamp post generation in the synthetic environment; ?C the position dependent LoS signal power variations in the shadow of tree tops; ?C the position of reflectors dependent on the satellites azimuth and elevation; ?C the mean power of echoes depending on their distance to the receiver and on the; ?C satellite elevation; ?C Rice factor and bandwidth of echo signals depending on the satellite elevation; ?C the life span of echoes depending on the satellite elevation; ?C the number of coexisting echoes in the channel depending on the satellite elevation; ?C and the movement of reflection points@ also depending on the satellite elevation. Deterministically modelled are: ?C the diffraction of the LoS signal on houses@ tree trunks and lamp posts; ?C the delay of diffracted signals received in the shadow of houses; ?C the mean attenuation through tree tops; ?C and the delay and Doppler shift trends of echo signals due to the receiver and reflector movement. An important model feature is the high level of detail. Realistic correlation between echo signals is achieved due to the used reflector position statistics combined with the deterministically calculated delay and Doppler trends. Full satellite azimuth and elevation dependency is given for both LoS and the echo signals. As general model parameters the snapshot rate@ the frequency band@ the user type and the environment can be chosen. Parameters for the distribution of e.g. house heights and widths@ for tree and lamp post size and positions@ but also for the street width and e.g. the receiver antenna height allow to model specific scenarios and to investigate their impact. High flexibility is also given by the way oriented deterministic and stochastic model approach. Receiver speed and heading input allows to simulate different movement situations@ e.g. turns@ a traffic jam@ stop and go@ or the relatively long stops at traffic lights. Also speeds which are even higher than during the measurement can be applied. For a complete description of the measurement@ the data analysis and the modelling of the satellite to earth multipath channel see also Lehner [2007]. The structure of this Annex is the following: Section 1 gives an introduction to the model@ ?? describes in detail the characteristics of the channel model and implementation features. Section 3 provide all features of the model which are dependent on the urban scenario where measurements were originally taken for the development of the model. Section 4 includes an Interface Control Document for users interested on understanding the software implementation or re-implement the model. Acronyms are found in ??. Section 7 provides information on intellectual property rights associated to the models and References.




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