将多天线阵列(multi-input multi-output, MIMO) 技术用于改善井下超宽带(ultra wideband, UWB)无线通信系统的误码率性能. 首先，研究单天线(single input single output, SISO)UWB 系统在矿井巷道的多径传播特性，以及相应的抗多径发射/接收策略和误码率性能. 在此基础上，从理论上分析MIMO 技术进一步提高
UWB 系统抗井下多径衰落的可行性；然后，在不增加系统发射能量和不改变SISO-UWB 接收机结构的前提下，通过增加发射天线数并结合无线信道空时分集理论，提出用于煤矿井下无线通信的MIMO-UWB 系统及其空时编/解码方案. 实验结果表明：与传统的SISO-UWB收发策略相比，所研究的MIMO-UWB空时编/解码方案在各类井下多径环境中均能获得35 dB 的误码率性能增益.
This paper applies the multi-input multi-output (MIMO) antenna technology to improve the bit error rate (BER) performance of ultra wideband (UWB) systems for underground coal mines. The multipath propagation environment in coal mines is studied. UWB transceivers using single-input single-output (SISO)antennas and their BER performance are analyzed. Feasibility of using MIMO for anti-multipath fading in coal mines is studied theoretically. With the transmission energy and the receiver structure unchanged, a MIMOUWB based space-time coding/decoding scheme is developed by just increasing the number of transmission antennas. Simulation results show that the MIMO-UWB space-time coding/decoding scheme can achieve 35 dB BER performance gain in various coal mine environments as compared with traditional SISO-UWB systems.
[1] 吴立新, 汪云甲, 丁恩杰, 朱旺喜, 张瑞新, 张申, 王植. 三论数字矿山—借力物联网保障矿山安全与智能采矿[J]. 煤炭学报, 2012, 37(3): 357-365.
Wu Lixin, Wang Yunjia, Ding Enjie, Zhu Wangxi, Zhang Ruixin, Zhang Shen,Wang Zhi. Thirdly study on digital mine: serve for mine safety and intellimine with support from IoT [J], Journal of China Coal Society, 2012, 37(3): 357-365.（in Chinese）
[2] 孙彦景, 钱建生, 李世银, 窦林名. 煤矿物联网络系统理论与关键技术[J]. 煤炭科学技术. 2011, 39(2): 69-72.
Sun Yanjing, Qian Jiansheng, Li Shiyin, Dou Linming. Theory and key technology for mine Internet of Things [J]. Coal Science and Technology, 2011, 39(2): 69-72. （in Chinese）
[3] C. Nerguizian, C. Despins, S. Affes. Geolocation in mines with an impulse response fingerprinting technique and neural networks [J]. IEEE Transactions on Wireless Communications, 2006, 5(2): 603–611.
[4] W. Zhuang, X. Shen, Q. Bi. Ultra-wideband wireless communications [J], Wireless Communications and Mobile Computing, 2003, 3(6): 663–685.
[5] A. Chehri, P. Fortier, P.M. Tardif. UWB-based sensor networks for localization in mining environments [J]. Ad Hoc Networks, 2008, 7(5): 179-188.
[6] A. Chehri, P. Fortier, P.M. Tardif. Large-scale fading and time dispersion parameters of UWB channel in underground mines [J]. International Journal of Antennas and Propagation, 2008, 5(1): 1-10.
[7] 王艳芬, 范助文, 于洪珍, 孙彦景. 矿井超宽带多径信道的频域AR建模[J], 中国矿业大学学报, 2011, 40(3): 405-409.
Wang Yanfen, Fan zhuwen, Yu Hongzhen, Sun Yanjing. The frequency domain AR modeling of the mine ultra wideband multipath channel [J]. Journal of China University of Mining and Technology, 2011, 40(3): 405-409. （in Chinese）
[8] 范新越, 杨维. 井下多媒体无线传感器网络自适应调制研究[J]. 煤炭学报, 2009, 34(9): 1291-1296.
Fan Xinyue, Yang Wei. Study on the adaptation modulation of underground mine multimedia wireless sensor networks [J], Journal of China Coal Society, 2009, 34(9): 1291-1296. （in Chinese）
[9] 张玉，杨维. 矿井巷道综合衰减模型与无线传输误码率性能综合比较[J]. 煤炭学报, 2011, 36(09): 1581-1586．
Zhang Yu, Yang Wei. Integrated attenuation model and BER performance analysis of typical wireless transmission technologies in mine tunnel [J], Journal of China Coal Society, 2011, 36(09): 1581-1586. （in Chinese）
[10] L. Yang and G. B. Giannakis. Analog space-time coding for multiantenna ultra-wideband transmissions [J]. IEEE Transactions on Communications, 2004, 52(3): 507-517.
[11] M. Lienard, P. Degauque, J. Baudet, D. Degardin. Investigation on MIMO channels in subway tunnels [J]. IEEE Journal on Selected Areas in Communications, 2003, 21(3):332-339.
[12] Molina-Garcia-Pardo,J.-M.,Lienard M.,Degauque P.,Simon,E.,Juan-Llacer L, On MIMO Channel Capacity in Tunnels[J]. IEEE Transactions on Antennas and Propagation, 2009, 57(11): 3697-3701.
[13] 郑红党. 煤矿井巷电波传播理论和MIMO信道建模关键技术研究[D]. 徐州: 中国矿业大学, 2009.
Zheng Hongdang. Study on the theory of radio propagation and the key technologies of MIMO channel model in mine tunnel [D]. Xuzhou: China University of Mining and Technology, 1965. （in Chinese）
[14] 姚善化, 吴先良. MIMO-OFDM用于提高矿井无线通信性能的研究[J]. 合肥工业大学学报(自然科学版), 2009, 32(4): 557-590.
Yao Shanhua, Wu Xianliang. Study on utilizing MIMO-OFDM to improve performance of mine wireless communication [J]. Journal of Hefei University of Technology, 2009, 32(4): 557-590. （in Chinese）
[15] T.S. Rappaport, Wireless communications principles and practices [M], 2nd Edition, Prentice Hall.
[16] A. Chehri, P. Fortier, P.M. Tardif, An investigation of UWB-based wireless networks in industrial automation [J], International Journal of Computer Science and Network Security, 2008, 8(2): 179-188.
[17] 张国鹏,王艳芬,丁恩杰. 矿井无线多媒体传感器网络UWB信号收发策略研究[J], 煤炭科学技术, 2013, 41(12): 71-75.
G. Zhang, Y. Wang, E. Ding, Study on UWB signal transmitting and receiving strategy of mine wireless multi-media sensor network [J]. Journal of Coal Science and Technology, 2013, 41(12): 71-75. （in Chinese）
[18] A. F. Molisch, Ultra-Wide-Band propagation channels [J]. Proceedings of the IEEE, 2009, 97(2): 353-371.
