Investigation of MIMO Channel Characteristics in a Two-Section Tunnel at 1.4725 GHz

Abstract

This paper presents results from a wide band single-input-single-output (SISO) and 16 × 16 virtual multiple-input-multiple-output (MIMO) measurement campaign at a center frequency of 1.4725 GHz in a 100-meter long tunnel laboratory which is terminated by a vertical wall with a metallic door. The path loss, root-mean-square delay spread (RMS-DS) characteristics, and power delay profiles (PDPs) are described. In addition, we provide results for the MIMO channel amplitude matrix, which offers a new perspective in understanding MIMO characteristics in tunnel scenarios. Our measurement results are analyzed and compared to ray tracing simulations. The relationships among the angle spread, channel matrix singular values, and MIMO capacity at various link distances are illustrated, and these provide insights into MIMO system deployment.

Experimental Investigation of Space and Polarization Characteristics of a Subway-Like Tunnel Channel

“…In [10], based on the waveguide theory, it was shown that the Gaussian distribution fitted well for PAS, and the AS characterization is the same as in [9]. In [11], co-polarized angular characterization was studied in the Nantong tunnel without considering the reflected wave from the other end of the tunnel (RWET), and the results reveal that the greater the Tx-Rx distance is, the lower the AS will be. However, there was a lack of PAS information in [11].…”

“…In [11], co-polarized angular characterization was studied in the Nantong tunnel without considering the reflected wave from the other end of the tunnel (RWET), and the results reveal that the greater the Tx-Rx distance is, the lower the AS will be. However, there was a lack of PAS information in [11]. To the best of our knowledge, the angle-of-arrival (AoA) of crosspolarized signals in tunnels are not reported yet.…”

Spatial Characteristics of Wideband Channels Using Leaky Coaxial Cables in Tunnel Scenario

“…Angular spread predicts many characteristics of the MIMO channel such as the capacity and singular distribution. On the basis of the waveguide theory, it was revealed that the Gaussian distribution fits considerably well for the PAS [16,17]. However, in literature a deficiency of PAS information in tunnel environment was observed.…”

Investigation of MIMO Channel Characteristics in Tunnel at 1.4725 and 6 GHz

“…Based on the large number of measured results of highway and HSR tunnels, the data processing method in tunnels should be different from other scenarios, and the data processing steps in tunnels are given in Lienard and Degauque (1998). Through the analysis of MIMO correlation and capacity, the influence of various factors in tunnel on MIMO performance is compared (Masson et al, 2012), and a simple ray tracing method is verified (Chen & Jeng, 2002; Hwang et al, 2002; Marcatili & Schmeltzer, 2014; Rongchen et al, 2017; Sun et al, 2017; Wang & Yang, 2006). The authors of Molina‐Garcia‐Pardo et al (2008) and Zhang et al (2016) provided time delay dispersion and Ricean K factors measurement results.…”