时延调整对单频网覆盖区域影响的研究

Research About SFN's Delay Effect on Coverage Area

在地面数字电视单频网的网络规划和调试中,为了改善多径效应对单频网覆盖区域造成的不良影响,不同发射台站会配置有不同的时延。不同发射台站之间的时延究竟如何影响覆盖区域是单频网网络调试中的重点与难点。针对地面数字电视单频网不同发射台站时延的调整,并结合主径信号与多径信号的信号强度比以及接收机门限电平等因素综合分析了单频网覆盖区域的变化规律,提出了在时延调整的情况下覆盖区域变化的分析方法,从而为地面数字电视单频网网络规划与调试提供一定的理论依据。

In the network planning and debugging of DTTV SFN, different delay times are matched with different transmitting stations in order to improve the multi-path effects on SFN coverage area. How the different delay times of different transmitting stations affect the coverage area of SFN is the focal and difficult point in network debugging. Be aimed at the adjustment of DTTV SFN different delay times, the variation of the SFN coverage area is analyzed according to the signal strength ratio of main path and multi-path and the threshold level of receiver. The solution to analyzing the change of SFN coverage area is proposed in order to provide theoretical foundation for the network planning and debugging of DTTV SFN.