volume | PIER Journals

Abstract

This article studies the spatial domain and polarization domain characteristics of multipath channels in a subway-like tunnel environment. Experiments were performed by rotating a horn antenna with 30^◦ half power beamwidth (HPBW) in the azimuthal direction for two different transmitter-receiver (Tx-Rx) distances. The time domain measurement is conducted when carrier frequency is set as 1.8 GHz. The cross-polarization discrimination (XPD) is studied, and it is found that the maximum depolarized signals are from sidewalls. The characteristics of power azimuth spectrum (PAS) of co-polarized and cross-polarized signals follow a multi-cluster Gaussian distribution. Ray-tracing method is employed to investigate the wave propagation in the tunnel environment. The results demonstrate that the main multipath components (MPCs) are around the line-of-sight (LOS) direction, and the reflected waves are from the other end of the tunnel (RWET). The correlation coefficient of co-polarized configuration pursues an increasing function with respect to the Tx-Rx distance and a decreasing function with respect to the cross-polarized configuration.

1. Wang, H., F. R. Yu, and H. Jiang, "Modeling of radio channels with leaky coaxial cable for LTE-M based CBTC systems," IEEE Communications Letters, Vol. 20, No. 5, 1038-1041, 2016.
doi:10.1109/LCOMM.2016.2536599 Google Scholar

2. Hrovat, A., G. Kandus, and T. Javornik, "A survey of radio propagation modeling for tunnels," IEEE Communications Surveys & Tutorials, Vol. 16, No. 2, 658-669, 2014.
doi:10.1109/SURV.2013.091213.00175 Google Scholar

3. Forooshani, A. E., S. Bashir, D. G. Michelson, and S. Noghanian, "A survey of wireless communications and propagation modeling in underground mines," IEEE Communications Surveys & Tutorials, Vol. 15, No. 4, 1524-1545, 2013.
doi:10.1109/SURV.2013.031413.00130 Google Scholar

4. Lienard, M., P. Degauque, J. Baudet, and D. Degardin, "Investigation on MIMO channels in subway tunnels," IEEE Journal on Selected Areas in Communications, Vol. 21, No. 3, 332-339, 2003.
doi:10.1109/JSAC.2003.809627 Google Scholar

5. Forooshani, A. E., R. D. White, and D. G. Michelson, "Effect of antenna array properties on multiple-input-multiple-output system performance in an underground mine," IET Microwaves, Antennas & Propagation, Vol. 7, No. 13, 1035-1044, 2013.
doi:10.1049/iet-map.2013.0102 Google Scholar

6. Forooshani, A. E., C. Y. T. Lee, and D. G. Michelson, "Effect of antenna configuration on MIMO-based access points in a short tunnel with infrastructure," IEEE Transactions on Communications, Vol. 64, No. 5, 1942-1951, 2016.
doi:10.1109/TCOMM.2016.2538769 Google Scholar

7. Valdesueiro, J. A., B. Izquierdo, and J. Romeu, "On 2 × 2 MIMO observable capacity in subway tunnels at C-band an experimental approach," IEEE Antennas and Wireless Propagation Letters, Vol. 9, 1099-1102, 2010.
doi:10.1109/LAWP.2010.2095816 Google Scholar

8. Molina-Garcia-Pardo, J. M., M. Lienard, P. Degauque, C. Garcia-Pardo, and L. Juan-Llacer, "MIMO channel capacity with polarization diversity in arched tunnels," IEEE Antennas and Wireless Propagation Letters, Vol. 8, 1186-1189, 2009.
doi:10.1109/LAWP.2009.2035299 Google Scholar

9. Garcia-Pardo, C., J.-M. Molina-Garc´ıa-Pardo, M. Lienard, D. P. Gaillot, and P. Degauque, "Double directional channel measurements in an arched tunnel and interpretation using ray tracing in a rectangular tunnel," Progress In Electromagnetics Research M, Vol. 22, 91-107, 2012.
doi:10.2528/PIERM11070110 Google Scholar

10. Forooshani, A. E., S. Noghanian, and D. G. Michelson, "Characterization of angular spread in underground tunnels based on the multimode waveguide model," IEEE Transactions on Communications, Vol. 62, No. 11, 4126-4133, 2014.
doi:10.1109/TCOMM.2014.2363126 Google Scholar

11. Sun, R., D. W. Matolak, C. Tao, L. Liu, Z. Tan, and T. Zhou, "Investigation of MIMO channel characteristics in a two-section tunnel at 1.4725 GHz," International Journal of Antennas and Propagation, Vol. 2017, 1-12, 2017. Google Scholar

12. L. Gurrieri, E., T. J. Willink, A. Petosa, and S. Noghanian, "Characterization of the angle, delay and polarization of multipath signals for indoor environments," IEEE Transactions on Antennas and Propagation, Vol. 56, No. 8, 2710-2719, 2008.
doi:10.1109/TAP.2008.927507 Google Scholar

13. Truffer, P. and P. E. Leuthold, "Wide-band channel sounding at 24 GHz based on a novel fiber-optic synchronization concept," IEEE Transactions on Microwave Theory and Techniques, Vol. 49, No. 4, 692-700, 2001.
doi:10.1109/22.915444 Google Scholar

14. MacCartney, G., T. Rappaport, M. Samimi, and S. Sun, "Wideband millimeter-wave propagation measurements and channel models for future wireless communication system design," IEEE Transactions on Communications, Vol. 63, No. 9, 3029-3056, 2015.
doi:10.1109/TCOMM.2015.2434384 Google Scholar

15. Nie, X., J. Zhang, and P. Zhang, "Polarization and spatial statistics of wideband MIMO relay channels in urban environment at 2.35 GHz," IEICE Transactions on Communications, Vol. 94-B, No. 1, 139-149, 2011.
doi:10.1587/transcom.E94.B.139 Google Scholar

16. Zhang, Y. P., Y. Hwang, and R. G. Kouyoumjian, "Ray-optical prediction of radio-wave propagation characteristics in tunnel environments. 2. Analysis and measurements," IEEE Transactions on Antennas and Propagation, Vol. 46, No. 9, 1337-1345, 1998.
doi:10.1109/8.719977 Google Scholar

17. Schumacher, L., K. I. Pedersen, and P. E. Mogensen, "From antenna spacings to theoretical capacities --- guidelines for simulating MIMO systems," The 13th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, Vol. 2, No. 2, 587-592, 2002.
doi:10.1109/PIMRC.2002.1047289 Google Scholar

18., http://www.zttcable.com. Google Scholar

Dr. Xiaoyu Yin

Dr. Guoxin Zheng