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International Journal of Antennas and Propagation
Volume 2014 (2014), Article ID 172924, 9 pages
Research Article

A Temporal Millimeter Wave Propagation Model for Tunnels Using Ray Frustum Techniques and FFT

1Department of Electronic Engineering, Sogang University, 1 Sinsu-dong, Mapo-gu, Seoul 121-742, Republic of Korea
2Department of Computer Science, Inha Technical College, 100 Inha-ro, Nam-gu, Incheon 402-752, Republic of Korea
3Radio Technology Group, Electronics and Telecommunications Research Institute, 218 Gajeong-ro, Yuseong-gu, Daejeon 305-700, Republic of Korea

Received 14 November 2013; Revised 20 February 2014; Accepted 7 March 2014; Published 7 April 2014

Academic Editor: Felipe Cátedra

Copyright © 2014 Choonghyen Kwon et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A temporal millimeter wave propagation model for tunnels is presented using ray frustum techniques and fast Fourier transform (FFT). To directly estimate or simulate effects of millimeter wave channel properties on the performance of communication services, time domain impulse responses of demodulated signals should be obtained, which needs rather large computation time. To mitigate the computational burden, ray frustum techniques are used to obtain frequency domain transfer function of millimeter wave propagation environment and FFT of equivalent low pass signals are used to retrieve demodulated waveforms. This approach is numerically efficient and helps to directly estimate impact of tunnel structures and surfaces roughness on the performance of millimeter wave communication services.