首页/ 题库 / [问答题]请分别解释:呼吸效应、阴影效应、同心圆效的答案

请分别解释:呼吸效应、阴影效应、同心圆效应、远近效应、多普勒效应、多径效应。

问答题
2022-04-21 04:28
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正确答案
呼吸效应:指随着业务量的增加(或减小),小区覆盖半径收缩(或扩大)的动态平衡现象。
阴影效应:移动台在运动的情况下,由于大型建筑物和其他物体对电波的传输路径的阻挡而在传播接收区域上形成半盲区,从而形成电磁场阴影,这种随移动台位置的不断变化而引起的接收点场强中值的起伏变化叫做阴影效应。
同心圆效应:各业务扩频因子不同,因而覆盖为半径不同的同心圆。
远近效应:同一手机用户有时靠近小区边缘,有时靠近基站。
多普勒效应:声波频率在声源移向观察者时变高,而在声源远离观察者时变低。
多径效应:在实际的无线电波传播信道中,常有许多时延不同的传输路径,称为多径效应。

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