Analysis Of Time-Frequency-Space Dispersion And Nonstationarity In Narrow-Strip-Shaped Networks

This paper presents the analysis of time-frequency-space dispersion and nonstationarity in high-speed railway (HSR) communication networks with the narrow-strip-shaped coverage mode. A long-term evolution (LTE)-based channel sounding system is used to measure the propagation characteristics in a dedicated HSR LTE network with the echo channel effect (ECE) caused by the same signaling from different remote radio units (RRUs). The measurement data in a rural scenario are partitioned into the cases without and with the ECE. Based on the processed data, root mean square (RMS) delay spread, Doppler spread, and angular spread are analyzed and modeled. In addition, the nonstationarity of the HSR channel is studied focusing on the stationarity interval. The presented results will be useful in non-stationary time-frequency-space channel modeling for narrow-strip-shaped HSR communication networks.