Channel Simulator for Land Mobile Satellite Channel Along Roadside Trees

We study the signal fading for the land mobile satellite channel caused by roadside trees. A channel simulator is developed which takes into account the signal fading caused by position-dependent tree scattered fields and by swaying tree components. In the model, the tree canopy is modeled as a vertically oriented cylindrical volume containing randomly distributed and oriented leaves and branches. The tree trunk is modeled as a finite lossy dielectric cylinder. Leaves are modeled as thin lossy dielectric disks and branches as finite lossy dielectric cylinders. The scattering pattern of the new model has a narrow forward lobe with an isotropic background which is comparable to the one found using the radiative energy transfer theory. In addition, the variation of the specific attenuation with frequency of the model is fairly similar to the one given in the ITU Recommendation. The model is validated using measurements at 2 GHz in terms of the cumulative distribution functions of the received signal and the Ricean K-factor, average fade duration and level crossing rate. Good agreement is found between the measured and simulated statistics.

[1]  L. Foldy,et al.  The Multiple Scattering of Waves. I. General Theory of Isotropic Scattering by Randomly Distributed Scatterers , 1945 .

[2]  C. W. Philpot,et al.  Variations in the moisture content of several fuel size components of live and dead chamise [Adenostoma fasciculatum. , 1965 .

[3]  B. Uscinski,et al.  The multiple scattering of waves in irregular media. II. Spatial autocorrelation functions , 1968, Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences.

[4]  T. Aulin.  A modified model for the fading signal at a mobile radio channel , 1979, IEEE Transactions on Vehicular Technology.

[5]  Chun Loo,et al.  A statistical model for a land mobile satellite link , 1985, IEEE Transactions on Vehicular Technology.

[6]  Fawwaz Ulaby,et al.  Microwave Dielectric Spectrum of Vegetation - Part II: Dual-Dispersion Model , 1987, IEEE Transactions on Geoscience and Remote Sensing.

[7]  M.A. Karam,et al.  Leaf-shape effects in electromagnetic wave scattering from vegetation , 1989, IEEE Transactions on Geoscience and Remote Sensing.

[8]  Fawwaz T. Ulaby,et al.  Using Mimics To Model L-band Multiangle and Multitemporal Backscatter From A Walnut Orchard , 1990 .

[9]  M. Al-Nuaimi,et al.  Measurements and predictions of attenuation and scatter of microwave signals by trees , 1994 .

[10]  Christian Mätzler,et al.  Microwave (1-100 GHz) dielectric model of leaves , 1994, IEEE Trans. Geosci. Remote. Sens..

[11]  I. J. Dilworth,et al.  Propagation effects due to foliage and building scatter at millimetre wavelengths , 1995 .

[12]  Paolo Ferrazzoli,et al.  Passive microwave remote sensing of forests: a model investigation , 1996, IEEE Trans. Geosci. Remote. Sens..

[13]  Akira Ishimaru,et al.  Wave propagation and scattering in random media , 1997 .

[14]  Roger H. Lang,et al.  Modeling tree effects on path loss in a residential environment , 1998 .

[15]  Simon R. Saunders,et al.  Antennas and Propagation for Wireless Communication Systems , 1999 .

[16]  H. Peltola,et al.  A mechanistic model for assessing the risk of wind and snow damage to single trees and stands of Scots pine, Norway spruce, and birch , 1999 .

[17]  Larry J. Greenstein,et al.  Moment-method estimation of the Ricean K-factor , 1999, IEEE Communications Letters.

[18]  de Ylc Yvo Jong,et al.  Measurement and modelling of radiowave propagation in urban microcells , 2001 .

[19]  M. O. Al-Nuaimi,et al.  A generic model of 1-60 GHz radio propagation through vegetation-final report , 2002 .

[20]  M. H. Hashim,et al.  Dynamic impact characterization of vegetation movements on radiowave propagation in controlled environment , 2003, IEEE Antennas and Wireless Propagation Letters.

[21]  P. Constantinou,et al.  Propagation model for vegetation effects in terrestrial and satellite mobile systems , 2004, IEEE Transactions on Antennas and Propagation.

[22]  Yvo L. C. de Jong,et al.  A tree-scattering model for improved propagation prediction in urban microcells , 2004, IEEE Transactions on Vehicular Technology.

[23]  N. Haritos,et al.  Mechanical stability of trees under dynamic loads. , 2006, American journal of botany.

[24]  Torbjörn Ekman,et al.  Modeling the Dynamic Effects of Vegetation on Radiowave Propagation , 2008, 2008 IEEE International Conference on Communications.

[25]  Fernando Perez Fontan,et al.  Modelling the Wireless Propagation Channel: A simulation approach with MATLAB , 2008 .

[26]  Torbjörn Ekman,et al.  Dynamic Model of Signal Fading due to Swaying Vegetation , 2009, EURASIP J. Wirel. Commun. Netw..

[27]  Pavel Valtr,et al.  A new physical-statistical model of the land mobile satellite propagation channel , 2010, Proceedings of the Fourth European Conference on Antennas and Propagation.