公开(公告)号：KR101552755B1

公开(公告)日：2015-09-11

申请号：KR1020120141208

申请日：2012-12-06

Applicant: 성균관대학교산학협력단

Inventor： 이영포 ,  채근홍 ,  윤석호

IPC: H04J11/00

Abstract: 본발명의일 예에따른블라인드 OFDM 주파수오프셋추정방법은 (a) OFDM 수신기에서비정규잡음이포함된 OFDM 신호가수신되는단계, (b) OFDM 신호에코쉬분포우도함수를적용하여최대우도추정치가연산되는단계및 (c) 초기주파수오프셋을설정하고, 최대우도추정치에대한유효추정범위내에서반복적연산으로최종주파수오프셋이추정되는단계를포함한다. 또는 (c) 단계에서최대우도추정치에대하여유효추정범위가설정되고, 유효추정범위에최대우도추정치가균등하게분포된경우, 주파수오프셋이한 번에추정되는단계를포함한다.

公开(公告)号：KR101508462B1

公开(公告)日：2015-04-07

申请号：KR1020140056595

申请日：2014-05-12

Applicant: 성균관대학교산학협력단

Inventor： 채근홍 ,  이영포 ,  윤석호

IPC: H04L27/26

Abstract: 본발명에따른부분주기도표기반의 OFDM 주파수오프셋추정방법은 OFDM (a) 수신신호에대한포락선균등처리(EEP: envelope equalized processing)를수행하는단계, (b) 포락선균등처리된수신신호에대한초기오프셋을추정하는단계및 (c) 초기오프셋및 부분주기도표를이용하여정밀오프셋을반복적으로추정하는단계를포함한다. 나아가 (d) 정밀오프셋추정이후발생가능한오프셋을추정하기위하여잔여오프셋을반복적으로추정하는단계를더 포함할수도있다. 이를통해낮은연산량을가지면서도신뢰성있는주파수오프셋추정할수 있다.

公开(公告)号：KR1020150000965A

公开(公告)日：2015-01-06

申请号：KR1020130073408

申请日：2013-06-26

Applicant: 성균관대학교산학협력단

Inventor： 이영포 ,  채근홍 ,  윤석호

IPC: H04W16/14

CPC classification number: H04L27/0006 ,  H04L25/067 ,  H04L25/08 ,  H04W72/00 ,  H04W16/14

Abstract: 협력스펙트럼셍싱방법은무선인지네트워크의검파기가복수의이차사용자들로부터일차사용자에게할당된스펙트럼대역에대한사용상태정보인관측벡터를수신하는단계(901), 검파기가관측벡터()에대한순서통계량을생성하는단계(902), 순서통계량에서크기가작은순서대로관측샘플을선택하여 GLRT 검정통계량을생성하는단계(903) 및 GLRT 검정통계량을합산하여 0 또는 1로표현되는분석결과값()을생성하는단계(904) 및검파기가분석결과값을융합센터부(200)에전달하고융합센터부(FC, 200)가분석결과값을융합하여스펙트럼대역의사용여부를판단하는단계(905)를포함한다.

Abstract translation: 本发明提供一种通过考虑非高斯噪声环境来感测协作频谱的装置和方法。 合作频谱感知方法包括以下步骤：由认知无线电网络中的检测器接收作为从多个次要用户分配给主用户的频谱带的使用状态信息的观测向量（901）; 通过检测器生成观测向量（y_m）的秩序统计（902）; 通过从较小的统计量到更大的统计量从订单统计中选择观察样本来生成GLRT测试统计（903）; 通过添加GLRT测试统计（904）生成表示为0或1的分析结果值（x_m）; 以及通过所述检测器将所述分析结果值传送到融合中心单元（200）并通过所述融合中心（FS）（200）对所述分析结果值（905）进行融合来确定是否使用所述频谱带。

公开(公告)号：KR101426292B1

公开(公告)日：2014-08-05

申请号：KR1020120149067

申请日：2012-12-20

Applicant: 성균관대학교산학협력단

Inventor： 이영포 ,  윤석호

IPC: G01S19/01

Abstract: CBOC 상관함수 생성 방법은 수신수단이 CBOC 신호를 수신하는 단계(500), 연산수단이 CBOC 신호와 복수의 국부 신호들을 이용하여 부분상관함수를 구하는 단계(501) 및 연산수단이 부분상관함수를 조합하여 주변 첨두가 제거된 CBOC 상관함수를 생성하는 단계(502)를 포함한다.

公开(公告)号：KR1020140028588A

公开(公告)日：2014-03-10

申请号：KR1020120095139

申请日：2012-08-29

Applicant: 성균관대학교산학협력단

Inventor： 이재우 ,  이영포 ,  윤석호

IPC: H04J11/00

CPC classification number: H04L27/2695 ,  H04J11/00 ,  H04L25/0202

Abstract: A method of estimating OFDM frequency offset based on partial periodogram according to the present invention includes the steps of (a) performing envelope equalized processing (EEP) with respect to an OFDM received signal, (b) estimating an initial offset for the received signal subject to the EEP, and (c) repeatedly estimating a precision offset by using the initial offset and the partial periodogram. The method may further include a step of (d) repeatedly estimating a residual frequency offset in order to estimate offsets that may be generated after the precision offset has been estimated. Accordingly, frequency offset can be estimated with a low amount of computation and reliability. [Reference numerals] (a) Perform EEP for OFDM received signal; (AA) I line; (b) Estimate initial offset for received signal subject to EEP; (BB) H line; (c) Repeatedly estimate precision offset by using initial offset and partial periodogram; (d) Repeatedly estimate residual offset by using initial offset and partial periodogram

Abstract translation: 根据本发明的基于部分周期图估计OFDM频偏的方法包括以下步骤：（a）针对OFDM接收信号执行包络均衡处理（EEP），（b）估计接收信号对象的初始偏移量 （c）通过使用初始偏移和部分周期图来重复地估计精度偏移。 该方法还可以包括以下步骤：（d）重复估计残余频率偏移量，以便估计在估计精度偏移之后可能产生的偏移。 因此，可以以低计算量和可靠性来估计频率偏移。 （附图标记）（a）对OFDM接收信号执行EEP; （AA）I行; （b）估计接收信号的初始偏移量; （BB）H线; （c）通过使用初始偏移和部分周期图重复估计精度偏移; （d）使用初始偏移和部分周期图重复估计残差

公开(公告)号：KR101343982B1

公开(公告)日：2013-12-24

申请号：KR1020120141209

申请日：2012-12-06

Applicant: 성균관대학교산학협력단

Inventor： 이영포 ,  윤석호

IPC: G01S13/08

Abstract: A distance measuring method using a DS-UWB signal given in the present invention is executed in a DS-UWB radar system. In particular, the distance measuring method using a DS-UWB signal includes a step of transmitting a DS-UWB signal in which a pseudo noise code is applied; a step of receiving the transmitted DS-UWB signal after being reflected by a target object; a step of calculating the correlation value between the received DS-UWB signal and a local signal; a step of accumulating the correlation value between the received DS-UWB signal and the local signal; and a step of calculating the distance between the DS-UWB radar system and the target object. [Reference numerals] (a) Step of transmitting a DS-UWB in which a pseudo noise code is applied;(AA) Start;(b) Step of receiving the transmitted DS-UWB signal after being reflected by a target object;(BB) End;(c) Step of calculating the correlation value between the received DS-UWB signal and a local signal;(d) Step of accumulating the correlation value between the received DS-UWB signal and the local signal;(e) Step of calculating the distance between the DS-UWB radar system and the target object

Abstract translation: 在DS-UWB雷达系统中执行使用本发明中给出的DS-UWB信号的距离测量方法。 特别地，使用DS-UWB信号的距离测量方法包括发送其中应用伪噪声码的DS-UWB信号的步骤; 在由目标物体反射之后接收发射的DS-UWB信号的步骤; 计算接收的DS-UWB信号与本地信号之间的相关值的步骤; 累加所接收的DS-UWB信号与本地信号之间的相关值的步骤; 以及计算DS-UWB雷达系统与目标物体之间的距离的步骤。 （a）发送应用伪噪声码的DS-UWB的步骤;（AA）开始;（b）在被目标对象反射后接收发送的DS-UWB信号的步骤;（BB ）结束;（c）计算接收的DS-UWB信号与本地信号之间的相关值的步骤;（d）在接收的DS-UWB信号与本地信号之间累加相关值的步骤;（e）步骤 计算DS-UWB雷达系统与目标物体之间的距离

公开(公告)号：KR101262560B1

公开(公告)日：2013-05-08

申请号：KR1020110071394

申请日：2011-07-19

Applicant: 성균관대학교산학협력단

Inventor： 강승구 ,  정다해 ,  이영포 ,  김준환 ,  윤석호

IPC: H04L27/26

Abstract: 본발명은 OFDM 시스템에서반복되는훈련심벌을이용하는주파수옵셋추정방법에관한것이다. 상기방법은주파수옵셋을추정하기위한모의실험에대한 OFDM 심벌을생성하는단계; 생성된 OFDM 심벌을 AWGN(덧셈꼴백색정규잡음) 환경또는레일레이채널에서각각전송시키는단계; 상기 OFDM 심벌을수신하는단계; Moose의훈련심벌구조를이용하는주파수옵셋추정기법, Schimidl의훈련심벌구조를이용하는주파수옵셋추정기법, Morelli의훈련심벌구조를이용하는주파수옵셋추정기법, 및 Laourine의훈련심벌구조를이용하는주파수옵셋추정기법을이용하여상기주파수옵셋추정기법들각각에대하여상기수신된 OFDM 심벌의주파수옵셋을추정하고추정된주파수옵셋과의평균제곱오류값(mean square error: MSE)을구하는단계; 및상기주파수옵셋추정기법들각각에대하여구해진 MSE를신호대 잡음비(SNR)에대해비교함으로써최적의주파수옵셋추정기법을결정하는단계를포함한다.

公开(公告)号：KR1020130041666A

公开(公告)日：2013-04-25

申请号：KR1020110106067

申请日：2011-10-17

Applicant: 성균관대학교산학협력단

Inventor： 정다해 ,  이영포 ,  강승구 ,  김준환 ,  윤석호

IPC: H04L27/26

CPC classification number: H04L27/2657 ,  H04L27/265 ,  H04L27/2676

Abstract: PURPOSE: A blind-based frequency offset estimation method is provided to increase the performance in an irregular noise environment OFDM(Orthogonal Frequency Division Multiplexing) system. CONSTITUTION: A frequency offset estimation method includes a stage(S101) of receiving a reception signal in a protective range and an OFDM(Orthogonal Frequency Division Multiplexing) signal range, a stage(S102) of calculating the number of samples in the protective range the same with the number of samples in the reception signal including the same signal in the later part of the protective range and OFDM signal range, a stage(S103) summing the calculated samples, a stage(S104) of calculating an angle from the summed signal of the samples and a stage(S105) of calculating a frequency offset estimation value based on the calculated angle. [Reference numerals] (AA) Start; (BB) End; (S101) Step of receiving a reception signal in a protective range and an OFDM signal range; (S102) Step of obtaining samples amounting to the number of samples(N_G) in the protective range from the reception signal; (S103) Step of adding up the samples; (S104) Step of calculating an angle from the summed signal of the samples; (S105) Step of calculating a frequency offset estimation value from the calculated angle;

Abstract translation: 目的：提供基于盲的频偏估计方法，以提高不规则噪声环境OFDM（正交频分复用）系统的性能。 构成：频率偏移估计方法包括：接收保护范围内的接收信号和OFDM（正交频分复用）信号范围的级（S101），在保护范围内计算采样数的级（S102） 与在保护范围和OFDM信号范围的后半部分中包括相同信号的接收信号中的样本数相同，阶段（S103）对所计算的样本求和，从求和信号计算角度的阶段（S104） 以及基于计算出的角度来计算频率偏移估计值的级（S105）。 （附图标记）（AA）开始; （BB）结束; （S101）接收保护范围和OFDM信号范围内的接收信号的步骤; （S102）从所述接收信号获取所述保护范围内的样本数（N_G）的样本的步骤; （S103）将样本相加的步骤; （S104）从样本的和信号计算角度的步骤; （S105）从计算出的角度计算频率偏移估计值的步骤;

公开(公告)号：KR101257014B1

公开(公告)日：2013-04-22

申请号：KR1020110065608

申请日：2011-07-01

Applicant: 성균관대학교산학협력단

Inventor： 김준환 ,  강승구 ,  정다해 ,  이영포 ,  윤석호

IPC: H04L27/26

Abstract: 샘플 표준 편차를 기초로 한 다중 경로 페이딩 채널에서 OFDM 시스템을 위한 타이밍 옵셋 추정 방법 및 이러한 방법을 사용하는 장치가 개시되어 있다. 타이밍 옵셋 추정 방법은 OFDM 수신 신호를 입력으로 하는 제1 함수를 이용해 제1 타이밍 옵셋을 추정하고, 상기 제1 타이밍 옵셋을 이용하여 산출된 제1 구간에서 프리앰블 신호 및 OFDM 수신 신호를 입력으로 하는 제2 함수를 이용해 제2 타이밍 옵셋 및 제1 타이밍 매트릭을 산출하는 단계와 제2 타이밍 옵셋을 기초로 산출된 제2 구간에서 제1 타이밍 매트릭의 표준 편차값을 입력으로 하는 제3 함수를 이용해 제3 타이밍 옵셋을 산출하는 단계를 포함할 수 있다. 따라서, 타이밍 옵셋을 추정 시 신호 경로 성분의 랜덤성에 강인한 특성을 갖는다.

公开(公告)号：KR1020130038731A

公开(公告)日：2013-04-18

申请号：KR1020110103246

申请日：2011-10-10

Applicant: 성균관대학교산학협력단

Inventor： 정다해 ,  이영포 ,  김준환 ,  강승구 ,  윤석호

IPC: H04L27/26 ,  H04L25/03 ,  H04B1/06

CPC classification number: H04L27/2657 ,  H04L27/265

Abstract: PURPOSE: A method and an apparatus of estimating a frequency offset based on training symbols in a wireless communication system are provided to improve estimation performance of the frequency offset under various noise environments including non-normal distribution noise as well as normal distribution noise. CONSTITUTION: A method of estimating a frequency offset based on training symbols in a wireless communication system comprise of: receiving signals comprising N samples(S101); obtaining N/2 samples from the received signals(S102); summing the N/2 samples(S103); finding an angle from the sum of N/2 samples(S104); and calculating an offset estimate based on the angle(S1050). [Reference numerals] (AA) Start; (BB) End; (S101) Step of receiving input signals; (S102) Step of obtaining N/2 samples from the received signals; (S103) Step of summing the N/2 samples; (S104) Step of finding an angle from the sum signal of the N/2 samples; (S105) Step of calculating an offset estimate from the found angle;

Abstract translation: 目的：提供一种基于无线通信系统中的训练符号估计频率偏移的方法和装置，以改善包括非正态分布噪声以及正态分布噪声在内的各种噪声环境下的频率偏移的估计性能。 构成：基于无线通信系统中的训练符号估计频率偏移的方法包括：接收包括N个采样的信号（S101）; 从接收到的信号中获得N / 2个样本（S102）; 对N / 2样本进行求和（S103）; 从N / 2个样本的和求出角度（S104）; 以及基于所述角度计算偏移估计（S1050）。 （附图标记）（AA）开始; （BB）结束; （S101）接收输入信号的步骤; （S102）从接收到的信号中获取N / 2个样本的步骤; （S103）对N / 2个样本求和的步骤; （S104）从N / 2个样本的和信号求出角度的步骤; （S105）从所述发现角度计算偏移估计的步骤;