针对超宽带无线系统(UWB系统)在矿井巷道中的多径传播所造成的频率选择性衰落,提出将多频带正交频分复用(MB-OFDM)技术应用到井下UWB系统中,对矿用环境下MB-OFDM超宽带无线信道进行建模并分析.在IEEE802.15.3a标准信道模型的基础上,根据矿井巷道的实际环境,确定了井下MB-OFDM超宽带无线通信系统的信道参数.给出此信道模型的冲击响应仿真图,结果显示,冲击响应明显多径成簇,这与实际测量中UWB系统多径成簇现象相验证.并通过仿真给出其信道的平均附加时延、均方根时延和多径数目3个主要特征数据.%According to the frequency selectivity decline caused by the multipath transmission of the ultra wideband radio system (UWB) system applied in the mine roadway, the MB-OFDM technology was applied to the UWB system in the underground mine and the modelling and analysis was conducted on the MB-OFDM ultra wideband radio channels in the mine environment. Based on the model of the IEEE802. 15.3a standard channel and according to the actual environment of the mine roadway, the signal channel parameters of MBOFDM ultra wideband radio channel system in the underground mine was determined. The surge response simulation diagram of the channel model was provided. The results showed that the surge response would be multipath clusters obviously, which would be the same to the phenomenon of the UWB mulfipath clusters verified in the actual measurement. The simulation provided the three main feature data of the average additional time delay, the mean square root time delay and multipath number for the channel.
展开▼
