摘要
由于信号中杂波的干扰,导致地面数字电视广播信号的误比特率相对较高,因此,提出基于快速傅里叶变换的地面数字电视广播信号干扰抑制。考虑到地面数字电视广播信号本身具有总量大的特点,构建了快速傅里叶变换方式实现对信号的预处理,设置了以时间函数为基础的窗口函数,将其待分析信号相乘,再对得到的乘积结果进行傅里叶变换。对于预处理后的信号,采用分析论证的方式,筛选了两路多级码片扩频调制信号,并按照非线性组合的方式得到无模糊的信号相位检测结果。针对异步信号的特性,实现干扰抑制。测试结果表明,设计方法可以实现对地面数字电视广播信号干扰的有效抑制,在降低信号BER方面具有良好作用。
Due to the interference of clutter in the signal,the bit error rate of terrestrial digital TV broadcasting signal is relatively high.Therefore,a fast Fourier transform based terrestrial digital TV broadcasting signal interference suppression is proposed.Considering that the terrestrial digital TV broadcasting signal itself has the characteristics of a large amount,a fast Fourier transform method is constructed to realize the preprocessing of the signal,a window function based on the time function is set,and the signal to be analyzed is multiplied,and then Fourier transform is performed on the obtained product result.For the preprocessed signal,by means of analysis and demonstration,the two-way multi-level chip spread spectrum modulation signal is screened,and the unambiguous signal phase detection result is obtained by nonlinear combination.According to the characteristics of asynchronous signals,interference suppression is realized.The test results show that the design method can effectively suppress the interference of terrestrial digital TV broadcast signals,and has a good effect on reducing the signal BER.
作者
李国红
LI Guohong(Mengyin County Integrated Media Center,Linyi 276200,China)
出处
《中国有线电视》
2022年第8期52-55,共4页
China Digital Cable TV
关键词
快速傅里叶变换
地面数字电视广播信号
时间函数
fast fourier transform
terrestrial digital television broadcasting signal
time function
