System Model of Underground UWB Based on MB-OFDM

Yanjing Sun, Beibei Zhang

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DOI: 10.4236/ijcns.2011.41007                

Abstract

To overcome the frequency-selective fading of ultra wide band (UWB) caused by the multi-path propagation in complicated environment of coal mines, an underground wireless communication system of UWB based on multi-band orthogonal frequency division multiplexing (MB-OFDM) for coal mine is presented. Inde-pendent angle impulse response is used to build up revised channel model for underground tunnels based on the traditional S-V model. With the revised channel model, we construct the underground UWB system based on MB-OFDM and give the band division scheme and the correction approach for channel. The model of the system was simulated in the complex environment of coal mine. Simulation results and analysis show that the underground wireless communication system of UWB based on MB-OFDM can effectively with-stand multipath fading and has the advantages of high anti-noise ability, low bit-error rate, and wide cover-age.

Keywords

Channel Model, Tunnel, Underground UWB, OFDM

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	C. Baouche, A. Freitas and M. Misson, “Radio Proximity Detection in a WSN to Localize Mobile Entities within a Confined Area,” Journal of Communications, Vol. 4, No. 4, 2009, pp. 232-240.
[2]	Y. Wu, M. Lin and I. J. Wassell, “Modified 2D Finite-Difference Time-Domain Based Tunnel Path Loss Prediction for Wireless Sensor Network Applications,” Journal of Communications, Vol. 4, No. 4, 2009, pp. 214-223.
[3]	W. Yang, X. S. Feng and J. P. Sun, “The Theories and Key Technologies for the New Generation Mine Wireless Information System,” Journal of China Coal Society, Vol. 29, No. 4, 2004, pp. 506-611.
[4]	J. P. Sun and Q. D. Shi, “Study on Electric Magnetic Transmission in Mine Roadway,” Coal Science and Technology, Vol. 29, No. 1, 2001, pp. 25-27.
[5]	Z. W. Moe, C. George and R. S. Nelson, “Performance of Rake Reception in Dense Multipath Channels: Implications of Spreading Band-Width and Selection Diversity Order,” IEEE Journal on Selected Areas in Communications, Vol. 18, No. 8, 2000, pp. 1516-1525. doi:10.1109/49.864015
[6]	P. Li, Y. J. Sun, J. S. Qian, et al., “Wireless Channel Model of UWB for Coal Mine Tunnels,” Journal of Huazhong University of Science and Technology, Vol. 36, No. s1, 2008, pp. 582-583.
[7]	Y.-F. Wang, H.-Z. Yu, S. Zhang, G.-G. Bi, et al., “Analysis of the Characteristic of Monocycle Waveform in Coal Mine UWB Communication System,” Journal of China University of Mining and Technology, Vol. 35, No. 2, 2006, pp. 167-169.
[8]	C. Q. Li, “Some Key Techniques Researches on the UWB-OFDM Systems,” Beijing University of Post and Telecommunication, Beijing, 2006.
[9]	W.-J. Dong, N.-H. Yu and Y. Yin, “A Novel Time-Frequency Coded Multi-Rate MB-OFDM UWB System Model,” Journal of Electronics & Information Technology, Vol. 28, No. 10, 2006, pp. 1858-1861.
[10]	Q. Y. Zou, A. Tarighat and A. H. Sayed, “Performance Analysis of Multi-band OFDM UWB Communications with Application to Range Improvement,” IEEE Transactions on Vehicular Technology, Vol. 56, No. 6, 2007, pp. 3864-3878. doi:10.1109/TVT.2007.901957