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Zhao XU
China University of Mining and Technology

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Angular Power Distribution of Wireless Channel in Mine Tunnels Yu HUO; Ting-ting WANG; Feng-xue LIU; Zhao XU
Indonesian Journal of Electrical Engineering and Computer Science Vol 11, No 3: March 2013
Publisher : Institute of Advanced Engineering and Science

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Abstract

The statistical characteristics of the angular power distribution of the wireless channel in mine tunnels are the concern of this paper. Firstly, we develop a ray-based channel model which provides the angular power spectrum (APS) in tunnels. We discuss the allowed rays existing in a tunnel based on the modal theory. The number of the allowed rays is limited. The directions of the rays are discrete. They are influenced by the excitation conditions. And then we deduce the propagation parameters as the functions of the direction of arrival (DOA) for each ray to reduce the computational burden. The model is validated by experimental measurements. Then theoretical results deduced from our model show that APS in the tunnel follows Gaussian distribution. For vertical polarization, the spread of the azimuth angle is more sensitive to the excitation conditions. While for horizontal polarization, the spread of the elevation angle is more sensitive. DOI: http://dx.doi.org/10.11591/telkomnika.v11i3.2224
Spatial Characteristics of Wireless Channel in Tunnel with Imperfect Walls Yi Zhang; Zhao Xu; Bo-Ming Song; Yu Huo
Indonesian Journal of Electrical Engineering and Computer Science Vol 12, No 7: July 2014
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v12.i7.pp5499-5507

Abstract

The successful design and application of the physical layer techniques of the wireless network, including MIMO, adaptive OFDM, and mining antenna, to name a few, need the detailed knowledge of the spatial characteristics of the transmitted signals. This paper provides a modal approach to quantify the spatial distribution of the waves in tunnels in detail. We develop the modal theory for propagation in a tunnel with imperfect walls, which are lossy, rough, and tilted. And then, we discuss the transmission power of the antenna as a function of the angles of departure (AOD). On this basis, we take the half-wave dipole antenna as an example to analyse by simulations. The theoretical results show that the angular power distribution in the rectangular tunnel follows Gaussian distribution. The angle spread (AS) of the waves can be influenced by the tunnel walls. The roughness of the wall surface is most important in small tunnels and at low frequencies, whereas the wall tilt is most important in large tunnels and at high frequencies.
Co-Authors Bo-Ming Song Feng-xue LIU Ting-ting WANG Yi Zhang Yu Huo Yu HUO