Keyholes in MIMO-OFDM: Train-to-Wayside Communications in Railway Tunnels
Joint Authors
Rodríguez, Carlos
Moreno García-Loygorri, Juan
de Haro, Leandro
Riera, José Manuel
Cuéllar, Luis
Source
Wireless Communications and Mobile Computing
Issue
Vol. 2017, Issue 2017 (31 Dec. 2017), pp.1-7, 7 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2017-08-07
Country of Publication
Egypt
No. of Pages
7
Main Subjects
Information Technology and Computer Science
Abstract EN
One of the key challenges in railway engineering is how to provide passengers an efficient, secure, and safe service.
To achieve this, operators and stakeholders demand robust and high-capacity train-to-wayside broadband radio.
Current radio technologies implement MIMO (Multiple-Input Multiple-Output) technology, whose use requires a good characterization of the propagation.
In this paper, the results of an experimental campaign on MIMO propagation in subway tunnels are presented.
The campaign makes use of an OFDM testbed at roughly 600 MHz, allowing the measurement of the 2×2 channel transfer matrix under different conditions regarding polarization, antenna separation, tunnel cross section, power allocation algorithm, and so forth.
Particular attention is paid to the probability of appearance of keyholes, which imply a severe degradation of the MIMO performance even when transmitter and receiver antennas are uncorrelated.
The measurements are carried out using a train that travels at the normal operative velocities.
As a result of the measurements, it has been found that the use of vertical polarization at both terminals is advantageous and that, on average but for a narrow margin, λ-spaced antennas outperform λ/2-spaced ones (90% capacities of 7.00 and 6.76 bps/Hz, resp.), although the latter show a lower probability of keyholes.
However, keyhole probabilities are always below 2%, so their influence on the performance of the whole system is limited.
American Psychological Association (APA)
Moreno García-Loygorri, Juan& de Haro, Leandro& Riera, José Manuel& Cuéllar, Luis& Rodríguez, Carlos. 2017. Keyholes in MIMO-OFDM: Train-to-Wayside Communications in Railway Tunnels. Wireless Communications and Mobile Computing،Vol. 2017, no. 2017, pp.1-7.
https://search.emarefa.net/detail/BIM-1206297
Modern Language Association (MLA)
Moreno García-Loygorri, Juan…[et al.]. Keyholes in MIMO-OFDM: Train-to-Wayside Communications in Railway Tunnels. Wireless Communications and Mobile Computing No. 2017 (2017), pp.1-7.
https://search.emarefa.net/detail/BIM-1206297
American Medical Association (AMA)
Moreno García-Loygorri, Juan& de Haro, Leandro& Riera, José Manuel& Cuéllar, Luis& Rodríguez, Carlos. Keyholes in MIMO-OFDM: Train-to-Wayside Communications in Railway Tunnels. Wireless Communications and Mobile Computing. 2017. Vol. 2017, no. 2017, pp.1-7.
https://search.emarefa.net/detail/BIM-1206297
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1206297