公开(公告)号：KR1020140092608A

公开(公告)日：2014-07-24

申请号：KR1020130004863

申请日：2013-01-16

Applicant: 세종대학교산학협력단

Inventor： 유영환 ,  신원재 ,  김영재

IPC: H04J11/00

CPC classification number: H04L27/2613 ,  H04L25/0224 ,  H04L27/2695

Abstract: The present invention relates to a frequency error estimating method based on an OFDM system and a device thereof. The frequency error estimating method based on the OFDM system according to the present invention comprises; a step of receiving an OFDM signal in which a pilot subcarrier is inserted from a transmission terminal and Fourier-transforming the received OFDM system; a step of grouping pilot subcarriers having a specific phase difference between the pilot subcarriers included in the OFDM signal as a sub group; a step of changing the pilot subcarriers included in the sub group as the same phase; a step of calculating a correlation value between adjacent subcarriers according to the each sub group and adding the correlation values obtained in the sub group; and a step of selecting an integer multiple frequency error estimating value in which the added value of the correlation values becomes a maximum value. According to the present invention, the calculation complexity can be reduced in comparison with a traditional technique by reducing complex multiplication calculation between the adjacent subcarriers of the correlation calculation of the subcarriers. Also, high costs generated in the actual implementation and the number of hardware can be reduced.

Abstract translation: 本发明涉及一种基于OFDM系统的频率误差估计方法及其装置。 基于根据本发明的OFDM系统的频率误差估计方法包括： 接收从发送终端插入导频子载波并对所接收的OFDM系统进行傅里叶变换的OFDM信号的步骤; 将包括在OFDM信号中的导频子载波之间的具有特定相位差的导频子载波分组为子组的步骤; 将包括在子组中的导频子载波改变为相同相位的步骤; 根据每个子组计算相邻子载波之间的相关值并将在子组中获得的相关值相加的步骤; 以及选择相关值的相加值成为最大值的整数倍频率误差估计值的步骤。 根据本发明，通过减少子载波的相关计算的相邻子载波之间的复数乘法运算，与传统技术相比，可以减少计算复杂度。 此外，实际实现中产生的高成本和硬件数量可以减少。

公开(公告)号：KR1020160141350A

公开(公告)日：2016-12-08

申请号：KR1020150109898

申请日：2015-08-04

Applicant: 세종대학교산학협력단 ,  (주) 싸이엔텍

Inventor： 김근수 ,  조성원 ,  김영재 ,  이임복

IPC: C01B31/04

Abstract: 그래핀제조장치및 그래핀제조방법을제공한다. 그래침제조장치는챔버내에금속박막롤을감고풀 수있는제1 회전롤및 제2 회전롤이구비되고, 이러한제1 회전롤및 제2 회전롤을정회전및 역회전시키는롤 구동부를포함한다. 따라서, 동일챔버내에서열처리단계와그래핀성장단계를구분하여수행할수 있는그래핀제조장치를제공할수 있다. 따라서, 화학기상증착법을이용한그래핀성장분야에서롤투롤공정에의해만들어지는그래핀의품질을단일박막시트를이용해서만들어지는그래핀의품질만큼향상시킬수 있으면서, 롤투롤공정의장점으로보다많은량의그래핀생산이가능하다.

公开(公告)号：KR1020130060489A

公开(公告)日：2013-06-10

申请号：KR1020110126574

申请日：2011-11-30

Applicant: 세종대학교산학협력단

Inventor： 유영환 ,  신원재 ,  김영재

IPC: H04L27/26

CPC classification number: H04L27/265

Abstract: PURPOSE: An apparatus and method for estimating an integer frequency offset and detecting a cell ID are provided to reduce hardware costs and the number of hardware and to reduce calculation complexity. CONSTITUTION: A fast Fourier transform unit(100) performs the fast Fourier transform of a PS(Primary Synchronization) signal received from a transmitter from a time domain axis to a frequency domain axis in a receiver. A first correlation value calculation unit(110) calculates the correlation values of left sub carriers and right sub carriers of a DC sub carrier in the fast Fourier transformed PS signal, and multiplies the symmetrical correlation values. A first signal sample adder(120) calculates the sum of the correlation values multiplied in the first correlation calculation unit. An integer frequency offset estimator(130) selects a real part of a value outputted from the first signal sample adder, and estimates an integer frequency offset by obtaining the maximum value from the real part. A second correlation calculation unit(140) calculates the correlation values of the left sub carriers and the right sub carriers of the DC sub carrier in the signal whose integer frequency offset is compensated, and multiplies the symmetrical correlation values. A second signal sample adder(150) calculates the sum of the correlation values multiplied in the second correlation calculation unit. A cell ID detector(160) selects a real part of a value outputted from the second signal sample adder, and detects a cell ID by obtaining the maximum value from the real part. [Reference numerals] (100) Fast Fourier transform unit; (112) First LS correlator; (114) First RS correlator; (115) First correlation value multiplier; (120) First signal sample adder; (130) IFO estimator; (142) Second LS correlator; (144) Second RS correlator; (146) Second correlation value multiplier; (150) Second signal sample adder; (160) CID detector; (AA) IPO compensation signal

Abstract translation: 目的：提供一种用于估计整数频率偏移和检测小区ID的装置和方法，以降低硬件成本和硬件数量并降低计算复杂度。 构成：快速傅里叶变换单元（100）执行从发射机从接收机中的时域轴到频域轴接收的PS（主同步）信号的快速傅立叶变换。 第一相关值计算单元（110）计算快速傅里叶变换的PS信号中的DC子载波的左副载波和右副载波的相关值，并将对称的相关值相乘。 第一信号采样加法器（120）计算在第一相关计算单元中相乘的相关值的和。 整数频偏估计器（130）选择从第一信号采样加法器输出的值的实部，并通过从实部获得最大值来估计整数频偏。 第二相关计算单元（140）计算补偿了整数频率补偿的信号中的直流副载波的左副载波和右副载波的相关值，并将对称的相关值相乘。 第二信号采样加法器（150）计算在第二相关计算单元中相乘的相关值的和。 小区ID检测器（160）选择从第二信号采样加法器输出的值的实部，并且通过从实部获得最大值来检测小区ID。 （附图标记）（100）快速傅立叶变换单元; （112）第一LS相关器; （114）第一RS相关器; （115）第一相关值乘数; （120）第一信号采样加法器; （130）IFO估计器; （142）第二LS相关器; （144）第二RS相关器; （146）第二相关值乘数; （150）第二信号采样加法器; （160）CID检测器; （AA）IPO补偿信号