窄带物联网信号对卫星广播电视接收的影响分析

Influence Analysis of NB-IoT Signal on Satellite Radio and Television Reception

窄带物联网(NB-IoT)下行信号采用功率密度谱提升技术,NB-IoT下行信号可能和某些卫星数字广播频道对应的中频频率相同,当卫星数字广播电视接收站距离NB-IoT基站较近时,在某些条件下,会对卫星数字广播接收的中频信号产生同频串扰,导致接收误码率高,严重影响音频广播节目的接收质量,通过变换本振频率可以避免干扰。通过分析相关参数,本文也给出了NB-IoT信号对C波段卫星广播接收的可能影响范围。

NB-IoT downlink signal adopts power density spectrum lifting technology.The frequency of NB-IoT downlink signal may be the same as intermediate frequency corresponding to some satellite digital broadcasting channels.When satellite digital radio and television receiving station is closer to NB-IoT base station,in some cases,frequency crosstalk will be generated on intermediate frequency signals received by satellite receiver,resulting in a high bit error rate,which seriously affects reception quality of audio broadcast programs.Interference can be avoided by changing local oscillator frequency.By analyzing relevant parameters,this paper also gives possible influence range of NB-IoT signals on C-band satellite broadcast reception.