When electrical parameter is changd by wet tunnel wall , electromagnetic wave propagation attenuation will vary 摘要矿井隧道壁湿润会引起电参数改变,从而使电磁波传播衰减率发生变化。
Moreover , although the diversity degree is limited , the interference level is closed to ideal case ( ie . , signal can received by all base stations ) and then capacity closed to isolated cell because of propagation attenuation especially in lower shadowing conditions 此外,由于信号固有的传播衰落,虽然分集度受限,但其基站所受干扰水平接近理想情形(移动台信号被所有基站接收) ,进而容量接近孤立蜂窝的容量。
Since there are only few papers about the topic , the simulating result have no alternative but to compare with the data of the upper inhomogeneous terrain . the similar trend is found for the two results , and larger propagation attenuation will follow the higher frequency or larger conductivity of the medium 由于有关覆盖层传播方面的文献资料几乎没有,所以只能把结果与地表均匀岩层的数据进行比较,结果表明平面波法和通信公式法计算得出的结果完全一致,并与在地表均匀岩层传播结果趋势类似,而且随着频率的增高或导电率的增大,传播衰减也增大。