Propagation at mmW Band in Metropolitan Railway Tunnels

González-Plaza, Ana; Calvo-Ramírez, César; Briso-Rodríguez, César; García-Loygorri, Juan Moreno; Oliva, David; Alonso, J.I.

doi:10.1155/2018/7350494

Cited by 7 publications

(8 citation statements)

References 21 publications

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“…It shows that the path loss exponents at 433, 900, 2400 MHz are much larger than that close to and smaller than that in free space (where n is equal to 2), respectively. It indicates that a higher frequency gets better coverage in a mine shaft environment, different from that in free space and similar to that in the straight tunnels [16]. Moreover, the waveguide effect was exhibited at 2.4 GHz since n is smaller than 2.…”

Section: Effect Of Frequency On Path Lossmentioning

confidence: 90%

“…In [14,15], propagation measurements at 2.4 GHz, 5.8 GHz in underground mine tunnels were conducted, and the RMS delay spread was found to have almost no correlation with the distance, due to the arbitrary scattering paths caused by the very rough walls. In [16], the measurement results at 24 GHz in metropolitan railway tunnel show a small path loss exponent of 1.3, which means a clear waveguide effect. In addition, the delay spread decreases as the distance increases, highlighting that higher modes extinguish faster than the lower ones.…”

Section: Introductionmentioning

confidence: 95%

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Uhf Wave Propagation in Mine Shaft Environment

Xue¹,

Tan²,

Shi³

2018

PIER M

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Wireless communication is very valuable in underground mines, in which channel characterization plays an important role. In this paper, both narrowband and wideband measurements at three typical ultra-high frequencies of 433, 900 and 2400 MHz in a real mine shaft are performed. To our knowledge, this is the first work focusing on radio propagation in the mine shaft environment. Important channel characteristics, such as the path loss, delay spread and the number of multipath components were extracted from the measured data and compared with that in tunnel channels. The effects of frequency and antenna position on the path loss were investigated. The relationship between the root-mean-square (RMS) delay spread and the transmitter-receiver distance was also analyzed. The results will deepen our understanding of the mine shaft channel and help to design shaft wireless systems.

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Section: Effect Of Frequency On Path Lossmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 95%

Uhf Wave Propagation in Mine Shaft Environment

Xue¹,

Tan²,

Shi³

2018

PIER M

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“…In Figure 4, we can see an example of measurements at two different frequencies on subway round tunnel of 4 m diameter at 2.5/5.7 and 24 GHz [28], and, in Table 5, we have the results of BP and path loss for different frequencies. In this case, the tunnel walls are made of concrete with a dielectric constant of r = 5 and low conductivity (σ = 10 −3 ).…”

Section: Propagation and Challenges Of The Wireless Communicationmentioning

confidence: 99%

Concepts of Hyperloop Wireless Communication at 1200 km/h: 5G, Wi-Fi, Propagation, Doppler and Handover

Tavsanoglu¹,

Briso-Rodríguez

Carmena-Cabanillas

et al. 2021

Energies

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The new generation of capsules that circulate through vacuum tubes at speeds up to 1200 km/h, which is being developed, demands communication systems that can operate at these speeds with high capacity and quality of service. Currently, the two technologies available are the new generation of 802.11ax networks and 5G NR. Using these technologies at such high speeds in a confined environment requires a careful study and design of the configuration of the network and optimization of the physical interface. This paper describes the requirements for critical and business communications, proposing a WLAN and 5G network design based on the analysis of the propagation characteristics and constraints of vacuum tubes and using propagation measurements and simulations made in similar environments at frequencies of 2.5/5.7/24 GHz. These measurements and simulations show that propagation losses in this environment are low (4–5 dB/100 m), as a consequence of the guided propagation, so that the use of bands is preferred. Finally, considering the propagation constraints and requirements of a Hyperloop system, a complete wireless communication system is proposed using two networks with 802.11 and 5G technology.

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“…Various wave propagation techniques have been investigated and published in this subject area. These include numerical techniques for solving electromagnetic wave propagation [7], ray tracing technique [8,9], modal technique [10], scaling technique [11,12], neural network [13], and empirical method [14]. The vector parabolic equation [15] and the finite difference time domain technique [16] have also been used to calculate the propagation of electromagnetic waves while reducing the computational complexity.…”

Section: Introductionmentioning

confidence: 99%

Path Loss Investigation in Hall Environment at Centimeter and Millimeter-Wave Bands

Samad

Choi

2022

Sensors

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The millimeter-wave (mmWave) frequency is considered a viable radio wave band for fifth-generation (5G) mobile networks, owing to its ability to access a vast spectrum of resources. However, mmWave suffers from undesirable characteristics such as increased attenuation during transmission. Therefore, a well-fitted path loss model to a specific environment can help manage optimal power delivery in the receiver and optimal transmitter power in the transmitter in the mmWave band. This study investigates large-scale path loss models in a university hall environment with a real-measured path loss dataset using directional horn antennas in co-polarization (H–H) and tracking antenna systems (TAS) in line-of-sight (LOS) circumstances between the transmitter and receptor at mmWave and centimeter-level bands. Although the centimeter-level band is used in certain industrialized nations, path loss characteristics in a university hall environment have not been well-examined. Consequently, this study aims to bridge this research gap. The results of this study indicate that, in general, the large-scale floating-intercept (FI) model gives a satisfactory performance in fitting the path loss both in the center and wall side links.

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Propagation at mmW Band in Metropolitan Railway Tunnels

Cited by 7 publications

References 21 publications

Uhf Wave Propagation in Mine Shaft Environment

Uhf Wave Propagation in Mine Shaft Environment

Concepts of Hyperloop Wireless Communication at 1200 km/h: 5G, Wi-Fi, Propagation, Doppler and Handover

Path Loss Investigation in Hall Environment at Centimeter and Millimeter-Wave Bands

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