类矩形矿井巷道中UHF宽带电磁波统计信道建模

A statistical channel model of wideband UHF radio waves along rectangular-like mine tunnel

从信道统计建模的角度,对类矩形矿井巷道中UHF频段宽带电磁波大尺度传播损耗和小尺度多径信号统计特性进行了分析,建立了基于Nakagam i分布的类矩形巷道宽带统计分段信道模型.利用所建立的信道模型,对900,1 800,2 400 MHz这3个典型UHF频段电磁波在类矩形巷道中的宽带信道统计特性进行了仿真.结果表明,在相同的传输距离下,载波频率增加,大尺度传播损耗增大,且在巷道弯曲或分支处大尺度传播损耗显著增大;参照收发信机在巷道中的相对位置以及载波频率的不同,小尺度多径延迟扩展可能表现出不同的变化特性.

From the point of view of statistical model establishment of wireless channel, the large-scale path loss and small-scale statistical characteristics of muhipath signals of the wideband UHF radio waves along rectangular- like mine tunnel were analyzed. Based on the Nakagami distribution a multi-section statistical channel model of the wideband UHF radio waves along rectangular-like mine tunnel was proposed. By utilizing the established model, the statistical characteristics of the wideband wireless channel of mine tunnel at 900, 1 800, 2 400 MHz were simulated and investigated. Simulation results show that the large-scale path loss is enlarged with the carrier frequency increasing when the transmission distance is the same. Compared with that along empty-straight tunnel the largescale path loss is enlarged seriously along curve or embranchment tunnel. According to the different relationship of position between transmitter and receiver in mine tunnel as well as carrier frequency, the small-scale time delay may show different variable characteristics.