公开(公告)号：KR100399054B1

公开(公告)日：2003-09-26

申请号：KR1020010086466

申请日：2001-12-28

Applicant: 한국전자통신연구원

Inventor： 서재현 ,  이용태 ,  김형남 ,  김승원 ,  류영재 ,  김정진 ,  한동석

IPC: H04N7/015

Abstract: PURPOSE: An apparatus and method for compensating for a carrier frequency offset using comparison of power of spectrum edge are provided to compensate for a frequency offset rapidly and accurately even when pilot power is reduced or distortion is generated in a pilot signal. CONSTITUTION: An analog/digital converter(101) converts an analog input signal into a digital signal. An automatic frequency controller(103) compares powers of outer portions of both sides of a baseband signal spectrum converted into a digital signal to estimate a frequency offset. A loop filter(106) and a numerical controlled oscillator(102) compensates for the estimated frequency offset. A phase controller(104) compensates for a remaining phase offset of carrier. The loop filter accumulates the number of times of changing the sign of a signal output from a sign determinator of the phase offset estimator to judge a remaining frequency offset and variably adjusts the bandwidth of the loop filter to compensate for the estimated frequency offset.

Abstract translation: 目的：提供一种利用频谱边缘的功率比较来补偿载波频率偏移的设备和方法，以即使在导频信号中导频功率减小或失真时也快速和准确地补偿频率偏移。 构成：模拟/数字转换器（101）将模拟输入信号转换为数字信号。 自动频率控制器（103）比较转换成数字信号的基带信号频谱两侧的外部部分的功率，以估计频率偏移。 环路滤波器（106）和数控振荡器（102）补偿估计的频率偏移。 相位控制器（104）补偿载波的剩余相位偏移。 环路滤波器累加改变从相位偏移估计器的符号确定器输出的信号的符号的次数以判断剩余频率偏移并且可变地调整环路滤波器的带宽以补偿估计的频率偏移。

公开(公告)号：KR1020030056269A

公开(公告)日：2003-07-04

申请号：KR1020010086466

申请日：2001-12-28

Applicant: 한국전자통신연구원

Inventor： 서재현 ,  이용태 ,  김형남 ,  김승원 ,  류영재 ,  김정진 ,  한동석

IPC: H04N7/015

CPC classification number: H04L25/03019 ,  H04L2027/0065 ,  H04L2027/0069

Abstract: PURPOSE: An apparatus and method for compensating for a carrier frequency offset using comparison of power of spectrum edge are provided to compensate for a frequency offset rapidly and accurately even when pilot power is reduced or distortion is generated in a pilot signal. CONSTITUTION: An analog/digital converter(101) converts an analog input signal into a digital signal. An automatic frequency controller(103) compares powers of outer portions of both sides of a baseband signal spectrum converted into a digital signal to estimate a frequency offset. A loop filter(106) and a numerical controlled oscillator(102) compensates for the estimated frequency offset. A phase controller(104) compensates for a remaining phase offset of carrier. The loop filter accumulates the number of times of changing the sign of a signal output from a sign determinator of the phase offset estimator to judge a remaining frequency offset and variably adjusts the bandwidth of the loop filter to compensate for the estimated frequency offset.

Abstract translation: 目的：提供使用频谱边缘功率比较来补偿载波频率偏移的装置和方法，即使当导频功率降低或导频信号中产生失真时，也可以快速，准确地补偿频偏。 构成：模拟/数字转换器（101）将模拟输入信号转换为数字信号。 自动频率控制器（103）比较转换成数字信号的基带信号频谱的两侧的外部功率来估计频率偏移。 环路滤波器（106）和数控振荡器（102）补偿估计的频率偏移。 相位控制器（104）补偿载波的剩余相位偏移。 环路滤波器累积改变从相位偏移估计器的符号确定器输出的信号的符号的次数，以判断剩余频率偏移，并可变地调整环路滤波器的带宽以补偿估计的频率偏移。