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高铁覆盖场景相对于普通场景,主要在于高速下的多普勒效应。接收到信号的波长因为信号源和接收机的相对运动而产生变化,称作多普勒效应。在移动通信系统中,特别是高速场景下,这种效应尤其明显,多普勒效应所引起的附加频移称为多普勒频移,移动速度越快,多普勒效应越明显,因此必须解决多普勒频偏问题。一、多普勒频移多普勒频移是铁路移动通信系统需要面临的一个典型问题,具体是指当移动终端和基站之间存在相对径向运动时,
High-speed rail coverage scenes relative to the normal scene, mainly in the Doppler effect at high speed. The wavelength of the received signal changes due to the relative motion of the signal source and the receiver, which is called the Doppler effect. In mobile communication systems, especially in high-speed scenes, this effect is especially noticeable. The additional frequency shift caused by the Doppler effect is called the Doppler shift. The faster the moving speed, the more obvious the Doppler effect. Therefore, Doppler frequency offset to solve the problem. First, Doppler frequency shift Doppler frequency shift is a typical problem that the railway mobile communication system needs to face, specifically when there is relative radial movement between the mobile terminal and the base station,