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Méthode de mesure et de modélisation de canaux de propagation radiomobile

Abstract : This work deals with both the narrow band and the large band characterization of the mobile channel in the specific context of macrodiversity. It is divided into experiments and more theoretical studies. All the results presented here were achieved at the France Telecom Research and Development (FTR&D) center. During the most critical phases of a mobile transmission, especially when the mobile lies on the border of a cell, it may be advantageous to connect it with one or several other base stations at the same time. This is what we call macrodiversity. This technique is inherent to new generation mobile systems. In CDMA for example, over 40% of the mobiles use it. The handover algorithm and its performances may depend on the low fading recorded on the different paths. They may also depend on the fast fading or on the impulse response profiles. This shows the paramount importance of a good channel knowledge and modelisation in situation of macrodiversity. It is with these goals in mind that this thesis was written. We first performed narrow band studies thanks to measurements and simulations. This helped us to build a complete model of the shadow fading, including both its autocorrelation and cross-correlation properties. Next, this model was implemented in system and capacity simulators, allowing the restoration of the shadowing phenomenon in a more realistic way. We completed our work with large band studies. To do so, we had to perfect the available FTR&D channel sounder and to imagine new measurement protocols. Eventually, we patented a large band sounding method in macrodiversity. We were also able do derive from this a method dedicated to channel identification in the more general context of numerical communications. At last, we tried to optimise the pseudo random sequences used in channel sounders and identifiers.
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Submitted on : Monday, October 4, 2004 - 8:00:00 AM
Last modification on : Tuesday, October 26, 2021 - 5:00:02 PM
Long-term archiving on: : Thursday, September 30, 2010 - 6:28:14 PM


  • HAL Id : pastel-00000817, version 1


Karim Zayana. Méthode de mesure et de modélisation de canaux de propagation radiomobile. domain_other. Télécom ParisTech, 2003. English. ⟨NNT : 2003 E 013⟩. ⟨pastel-00000817⟩



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