Abstract
<p class="Abstract"><span lang="EN-US">The propagation channel aboard trains is investigated with reference to the propagation path loss within cars, the delay spread and the coherence bandwidth. Results show that the path loss exponent is slightly smaller than in free space, possibly due to reflections by metal walls, and that it does not depend significantly on the position of transmitter and receiver. The delay spread and coherence bandwidth depend on both the polarization and distance between transmitter and receiver while the effect of interaction is not statistically significant. The best fit for both delay spread’s and coherence bandwidth’s experimental distribution is also investigated. Results show that it does not always match models suggested in the literature and that the fit changes with the values of the input parameters. Finally, the functional law between coherence bandwidth and delay spread is determined. Results typically match expectations although the specific measurement configuration effects the model parameters.</span></p>
Highlights
Use of telecommunication services aboard trains is becoming more and more common for providing information and entertainment services to passengers during trips
In [6], [7] it is shown that the use of a directive antenna reduces the Doppler spread and increases the received power when train runs towards the base transmitting station (BTS); when train moves away from BTS the omnidirectional antenna provides better results instead
Both conditions pose a limit to the validity of results of analysis of variance (ANOVA) the very small p-values associated to the effect of distance and polarization may compensate for it
Summary
Use of telecommunication services aboard trains is becoming more and more common for providing information and entertainment services to passengers during trips. There are two main areas of interest for researchers in order to reduce performance degradation: the study of the propagation characteristics aboard trains to determine the attenuation. In [2]–[4] the results of an extensive measurement campaign to characterize the behavior of the disturbance radiated by the electric arc generated by the interaction between pantograph and overhead wire can be found, while the effects of pulses onto some Quality-of-Service parameters have been investigated in [5]. In [6], [7] it is shown that the use of a directive antenna reduces the Doppler spread and increases the received power when train runs towards the base transmitting station (BTS); when train moves away from BTS the omnidirectional antenna provides better results instead. In [14] propagation on board has been analyzed with a 2.35 GHz
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