摘要
在QPSK系统中,当存在单频干扰或者窄带干扰时,会对系统的解调性能产生不利影响,导致误码率升高。提出了一种在变换域基于DFT变换的窄带干扰抑制技术,该方法将输入信号经FFT变换到频域,根据动态调整的门限找出认为存在干扰的频率谱线,将其置零,达到抑制窄带干扰的目的。仿真结果表明该抑制算法可以较好地抑制窄带干扰,同时又能对有用信号最大限度地保留,具有较高的工程使用价值。
The adding of single-frequency interference or narrowband interference to QPSK system will result in the negative effect on system performance and the increase of symbol error rate.A kind of NBI technique based on the DFT transformation is put forward, in which the input signal is transformed to the frequency domain by means of FFT transformation.Then according to the dynamic adjustment of threshold,the frequency spectrum line,where the interference is considered to exist,is found and set to zero in order to suppress the narrowband interference （NBI）.The simulation results show that this method can suppress NBI better and retain the useful signals, and this method has better value in engineering.
出处
《无线电通信技术》
2015年第3期55-58,共4页
Radio Communications Technology
