Experimental Characterization of LTE Wireless Links in High-Speed Trains

Figure 19

Estimated RMS delay spread for the train moving at 200 km/h from the north sector to the south one. Both sectors are active. The overimposed pattern of gray diagonal lines denotes the areas where the train speed was not constant. Smoothed instantaneous values by means of a sliding window are also shown, as well as the mean delay spread for the whole path.