Abstract
A 28 GHz millimeter-wave (mm-wave) propagation measurement campaign was performed to predict the multiple-input multiple-output (MIMO) channel performance in a tunnel environment. Two kinds of polarization configurations were studied in this paper. In order to overcome the serious path loss (PL) of mm-wave propagation, a high gain directional horn antenna was used in the measurements of tunnel environment. The measurement results and simulation results at same specific locations are compared. The result of comparison indicates that the simulation model matches the measurement well. Then the MIMO capacity at other locations of the tunnel can be predicted by the simulation model. Further-more, it is inferred that the antenna array elements of horizontally polarized configuration have higher capacity than the vertically polarized under the constant signal-to-noise ratio (SNR).
Highlights
There is a growing interest in the urban rail transit systems in underground tunnels to increase the data rates
In [6], a measurement campaign was performed in a mine tunnel and 2×2 mm-wave multiple-input multiple-output (MIMO) channel capacity using microstrip patch antenna arrays was calculated for the line of sight (LOS) and non-LOS (NLOS) conditions
The mm-wave MIMO channel measurement at 28 GHz by using directional antennas was performed in a subway tunnel in Nantong, China
Summary
There is a growing interest in the urban rail transit systems in underground tunnels to increase the data rates. It is essential to study the mm-wave multiple-input multiple-output (MIMO) channel propagation characteristics in subway tunnels. MIMO channel performance was initially investigated in the subway tunnel environment in [2] for the lower frequency band (under 6 GHz). In [5], Single-input single-output (SISO) mm-wave channel measurements were conducted in a mine tunnel under the narrow and wide environments. In [6], a measurement campaign was performed in a mine tunnel and 2×2 mm-wave MIMO channel capacity using microstrip patch antenna arrays was calculated for the line of sight (LOS) and non-LOS (NLOS) conditions. A mmwave MIMO channel measurement using high gains directional horn antenna in the same mine tunnel were executed in [7]. X. Liu et al.: Experimental Investigation of Millimeter-Wave MIMO Channel Characteristics in Tunnel TABLE 2. HH: All Tx and Rx antenna array elements are horizontally polarized
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