Simulation and Analysis of Propagation Characteristics for Tunnel Train-Ground Communications at 1.4 and 40 GHz

Zhou, Tao; Li, Huayu; Sun, Rongchen; Wang, Yang; Liu, Liu; Cheng, Tao

doi:10.1109/access.2019.2932125

Cited by 9 publications

(9 citation statements)

References 29 publications

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“…It is observed from Figure 9(a) that RMS-DS decreases with the increase of Tx-Rx distance, which is basically consistent with the simulation results of the ray-tracing method in [15]. is can be explained by the modal theory [29].…”

Section: Narrowband Channel Characterizationsupporting

confidence: 85%

“…Broadband measurements are conducted in the tunnel environment in [11][12][13]. e influence of train cars on the wireless channel in the tunnel is considered and examined in [14,15]. Massive MIMO channels are measured in various scenarios strongly related to the subway tunnel environments, such as subway platform halls at 6 GHz and 11 GHz [16,17] and intrawagon environment at the millimeter wave (mmWave) bands [18].…”

Section: Introductionmentioning

confidence: 99%

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Channel Measurement for Multiple Frequency Bands in Subway Tunnel Scenario

Ji²,

Zhao

et al. 2021

International Journal of Antennas and Propagation

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In next-generation radio communication systems, the use of higher frequency bands and the massive multiple-input-multiple-output (MIMO) systems has turned into hot research topics because they have the potential to increase network capacity significantly by exploiting the available narrowband and broadband spectrums. Therefore, the narrowband channel measurements are executed at the following five potential frequency bands, including 2.6 GHz, 3.5 GHz, 5.6 GHz, 10 GHz, and 28 GHz in the Shanghai subway tunnel environment in order to fulfill the latest standards of fifth generation (5G). Moreover, in the broadband channel measurements, the center frequency is 3.5 GHz and 5.6 GHz and the bandwidth is considered as 160 MHz, respectively. At the transmitter (Tx) side, a uniform rectangular antenna array composed of 32 elements is fixed on the platform near the tunnel walls. The receiver (Rx) is equipped with a uniform cylindrical antenna array consisting of 64 elements, which is set on a trolley along the track. Based on the acquired massive MIMO channel impulse responses, delay spread, angle spread, eigenvalue and channel capacity are analyzed. The results reveal that the multipath delay in the tunnel scenario is quite short, the delay spread and angle spread drop rapidly as the distance between Tx and Rx increases and the channel matrix gradually becomes serious. This research provides a reference for the deployment of future 5G systems in the subway tunnel.

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Section: Narrowband Channel Characterizationsupporting

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Channel Measurement for Multiple Frequency Bands in Subway Tunnel Scenario

Ji²,

Zhao

et al. 2021

International Journal of Antennas and Propagation

View full text Add to dashboard Cite

show abstract

“…A typical straight subway tunnel scene was simulated in [18], and the PL and RMS-DS at 30 GHz were analyzed by using the RTmethod. In [19], the channel characteristics at 1.4 GHz and 40 GHz in the tunnel were compared based on the simulation results. It was found that when there existed a train in the tunnel, there would be more multipath components, and the propagation characteristics of copolarization and cross polarization performed much differently.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Propagation Characteristics for Various Subway Tunnel Scenarios at 28 GHz

Wang

Ji²,

Zheng

et al. 2021

International Journal of Antennas and Propagation

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In order to meet the higher data transmission rate requirements of subway communication services, the millimeter wave (mmWave) broadband communication is considered as a potential solution in 5G technology. Based on the channel measurement data in subway tunnels, this paper uses ray-tracing (RT) simulation to predict the propagation characteristics of the 28 GHz millimeter wave frequency band in different tunnel scenarios. A large number of simulations based on ray-tracing software have been carried out for tunnel models with different bending radiuses and different slopes, and we further compared the simulation results with the real time measurement data of various subway tunnels. The large-scale and small-scale propagation characteristics of the channel, such as path loss (PL), root mean square delay spread (RMS-DS), and angle spread (AS), for different tunnel scenarios are analyzed, and it was found that the tunnel with a greater slope causes larger path loss and root mean square delay spread. Furthermore, in the curved tunnel, the angle spread of the azimuth angle is larger than that in a straight tunnel. The proposed results can provide a reference for the design of future 5G communication systems in subway tunnels.

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“…The radio wave coverage in the tunnel environment has been studied for a long time [1][2][3] , and it can be modeled and predicted by measurements or by physics-based methods. Several measurement works on radio wave coverage in confined spaces have been published [4][5][6] . In [5], the radio wave transmission in the millimeter-wave band of 41 GHz for non-line-of-sight scenarios in a confined building corridor environment is measured.…”

Section: Introductionmentioning

confidence: 99%

Optimized Scheme of Antenna Diversity for Radio Wave Coverage in Tunnel Environment

et al. 2020

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To suppress the deep fading of radio waves caused by the tunnel waveguide effect, this paper presents an optimized scheme for the spatial and polarization diversities of tunnel antennas. Through the correlation coefficient analysis of path loss curves obtained by antennas placed at different positions, the two antenna positions that generate path loss curves with the lowest correlation coefficient are found, and these two antennas are defined as a diversity antenna pair. Using this scheme, the spatial diversity properties of the transmitting antenna and receiving antenna, as well as the spatial-polarization combined diversity property of the transmitting antenna, are obtained. Furthermore, the impact of antenna polarization on the spatial diversity property is investigated. The performance of the proposed scheme for spatial and polarization diversities is evaluated in terms of the intensity and uniformity of the path loss. The simulation results illustrate that the proposed diversity optimization scheme can suppress the influence of the waveguide effect and achieve more uniform and flatter radio wave coverage in a tunnel environment.

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Simulation and Analysis of Propagation Characteristics for Tunnel Train-Ground Communications at 1.4 and 40 GHz

Cited by 9 publications

References 29 publications

Channel Measurement for Multiple Frequency Bands in Subway Tunnel Scenario

Channel Measurement for Multiple Frequency Bands in Subway Tunnel Scenario

Analysis of Propagation Characteristics for Various Subway Tunnel Scenarios at 28 GHz

Optimized Scheme of Antenna Diversity for Radio Wave Coverage in Tunnel Environment

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