When electrical parameter is changd by wet tunnel wall , electromagnetic wave propagation attenuation will vary 摘要礦井隧道壁濕潤會(huì)引起電參數(shù)改變,從而使電磁波傳播衰減率發(fā)生變化。
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,由于信號(hào)固有的傳播衰落,雖然分集度受限,但其基站所受干擾水平接近理想情形(移動(dòng)臺(tái)信號(hào)被所有基站接收) ,進(jìn)而容量接近孤立蜂窩的容量。
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 由于有關(guān)覆蓋層傳播方面的文獻(xiàn)資料幾乎沒有,所以只能把結(jié)果與地表均勻巖層的數(shù)據(jù)進(jìn)行比較,結(jié)果表明平面波法和通信公式法計(jì)算得出的結(jié)果完全一致,并與在地表均勻巖層傳播結(jié)果趨勢類似,而且隨著頻率的增高或?qū)щ娐实脑龃螅瑐鞑ニp也增大。