数字电视地面广播中的干扰消除技术研究

Research on Interference Cancellation Technology in Digital TV Terrestrial Broadcasting

现阶段,数字电视地面广播中的载体是无线电波,并把空中接口作为信道,射频信号由发射台发出后,通过无线电波在绕射、反射之后,进入接收端后形成的混合信号由多种信号叠加而成。数字电视地面广播的工作频段在100~1 000 Hz,是一个非常复杂的信道,需要利用的信号被其余各种无用信号所干扰,例如多径干扰、白噪声干扰和多普勒频移,因此有必要对数字电视地面广播中的干扰消除技术进行研究。

At present,is the carrier of the digital television terrestrial broadcasting radio waves,air interface as the channel,after the issue of the radio frequency signal from launch pad by radio waves,after the diffraction and reflection signals in the receiving end after the formation of the mixed signal by a variety of signal superpo-sition.Digital TV ground broadcasting frequencies between 100 and 1000 Hertz,it is a very complex channel, need to use the signal interference by the rest of the all kinds of useless signals,such as multipath interference and white noise interference and doppler frequency shift.