公开(公告)号：KR1020010064275A

公开(公告)日：2001-07-09

申请号：KR1019990062428

申请日：1999-12-27

Applicant: 한국전자통신연구원

Inventor： 임형수 ,  유문희 ,  이수인 ,  이성팔

IPC: H04B1/7073

CPC classification number: H04L27/265 ,  H04L27/2657 ,  H04L2027/0065

Abstract: PURPOSE: A Doppler frequency transition compensating method using an FFT(Fast Fourier Transform) is provided to compare signal component powers of two frequencies adjacent to an IF(Intermediate Frequency), and to control an output frequency of a local oscillator. CONSTITUTION: After performing a frequency transition to a base band, a system detects a Doppler frequency transition. According to a detected result, the system compensates a remaining carrier wave frequency of a base band receiving signal. The system performs an FFT(Fast Fourier Transform) for the signal, and calculates a power distribution of a discrete frequency component. The system estimates a remaining carrier wave frequency error. The system reduces noises by using an LPF(Low Pass Filer). The system controls a frequency of a local oscillator, and compensates the remaining carrier wave frequency error. If errors are generated while compensating the remaining carrier wave frequency error, the system returns to a remaining carrier wave frequency compensation step or an error estimating step according to an error kind.

Abstract translation: 目的：提供一种使用FFT（快速傅立叶变换）的多普勒频率转换补偿方法，用于比较与IF（中频）相邻的两个频率的信号分量功率，并控制本地振荡器的输出频率。 构成：在对基带执行频率转换之后，系统检测多普勒频率转换。 根据检测结果，系统补偿基带接收信号的剩余载波频率。 该系统对信号进行FFT（快速傅立叶变换），并计算离散频率分量的功率分布。 系统估计剩余的载波频率误差。 该系统通过使用LPF（Low Pass Filer）来降低噪音。 该系统控制本地振荡器的频率，并补偿剩余的载波频率误差。 如果在补偿剩余载波频率误差的同时产生误差，则系统根据错误种类返回到剩余的载波频率补偿步骤或误差估计步骤。