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公开(公告)号：KR1020130027090A
公开(公告)日：2013-03-15
申请号：KR1020110087120
申请日：2011-08-30
Applicant: 성균관대학교산학협력단
IPC: H04L27/26
CPC classification number: H04L27/2657 , H04L27/2672 , H04L27/2675
Abstract: PURPOSE: A method and a device for estimating frequency offset based on a partial period graph in a wireless communication system are provided to reduce the amount of calculation and complexity. CONSTITUTION: An OFDM(Orthogonal Frequency Division Multiplexing) receiver performs EEP(Envelope Equalized Processing) for a receiving signal(S200). The OFDM receiver calculates a partial period graph for a plurality of test values based on the receiving signal which the EEP is performed(S210). The OFDM receiver estimates first frequency offset based on two adjacent partial period graphs of partial period graphs for the plurality of test values(S220). The OFDM receiver estimates second frequency offset based on two adjacent partial period graphs based on the estimated first frequency offset(S230). The OFDM receiver estimates third frequency offset based on the two adjacent partial period graphs based on the first frequency offset and the second frequency offset(S240). The OFDM receiver estimates the final frequency offset by adding the first frequency offset, the second frequency offset, and the third frequency offset(S250). [Reference numerals] (AA) Start; (BB) End; (S200) Performing EEP for a receiving signal; (S210) Calculating a partial period graph for a plurality of test values; (S220) Estimating first frequency offset based on two adjacent partial period graphs; (S230) Estimating second frequency offset based on two adjacent partial period graphs and the estimated first frequency offset; (S240) Estimating third frequency offset based on the two adjacent partial period graphs, the first frequency offset, and the second frequency offset; (S250) Estimating the final frequency offset by adding the first frequency offset, the second frequency offset, and the third frequency offset
Abstract translation: 目的：提供一种用于在无线通信系统中基于部分周期图估计频率偏移的方法和装置，以减少计算量和复杂度。 构成：OFDM（正交频分复用）接收机对接收信号执行EEP（包络均衡处理）（S200）。 OFDM接收机基于执行EEP的接收信号来计算多个测试值的部分周期图（S210）。 OFDM接收机基于多个测试值的部分周期图的两个相邻部分周期图来估计第一频率偏移（S220）。 OFDM接收机基于估计的第一频率偏移估计基于两个相邻部分周期图的第二频率偏移（S230）。 OFDM接收机基于第一频率偏移和第二频率偏移量，基于两个相邻的部分周期图来估计第三频率偏移（S240）。 OFDM接收器通过添加第一频率偏移，第二频率偏移和第三频率偏移来估计最终频率偏移（S250）。 （附图标记）（AA）开始; （BB）结束; （S200）对接收信号执行EEP; （S210）计算多个测试值的部分周期图; （S220）基于两个相邻的部分周期图来估计第一频率偏移; （S230）基于两个相邻部分周期图和估计的第一频率偏移来估计第二频率偏移; （S240）基于两个相邻的部分周期图，第一频率偏移和第二频率偏移来估计第三频率偏移; （S250）通过添加第一频率偏移，第二频率偏移和第三频率偏移来估计最终频率偏移
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公开(公告)号：KR1020130005327A
公开(公告)日：2013-01-16
申请号：KR1020110066645
申请日：2011-07-06
Applicant: 성균관대학교산학협력단
IPC: H04L27/26
CPC classification number: H04L27/2657
Abstract: PURPOSE: A method of estimating a frequency offset in a radio communication system is provided to prevent a sudden degradation of an estimated performance in the OFDM based CR system by providing strong and excellent estimated performance in various noise environments. CONSTITUTION: In the entire-domain of frequency offset value, frequency offset of P units are respectively estimated instead of estimating one of frequency offset in the local range of P units. A frequency offset which has the smallest error is determined as a final frequency offset value. A frequency offset estimator(200) comprises local optimal estimator of P units which respectively estimates frequency offset of P units. Local optimal estimator(210) provides an initial value of predetermined offset which is respectively corresponding in the local range. A frequency offset is respectively estimated by using an equation. A frequency offset estimator determines a frequency offset which has the smallest error among the frequency offset of P units as a value of final frequency offset. [Reference numerals] (AA) Receiving signal; (BB) Selecting ε^_p having the minimum |ε^_p-ε_p|; (CC) Final estimated value ε^
Abstract translation: 目的：提供一种在无线电通信系统中估计频率偏移的方法，以通过在各种噪声环境中提供强大且优异的估计性能来防止基于OFDM的CR系统中的估计性能的突然劣化。 构成：在频偏值的整个范围内，分别估计P单位的频偏，而不是估计P单位局部范围内的频偏。 具有最小误差的频率偏移被确定为最终频率偏移值。 频率偏移估计器（200）包括分别估计P个单元的频率偏移的P个单元的局部最优估计器。 局部最优估计器（210）提供在局部范围内分别对应的预定偏移量的初始值。 通过使用等式分别估计频率偏移。 频率偏移估计器确定作为最终频率偏移值的P单位的频率偏移中具有最小误差的频率偏移。 （附图标记）（AA）接收信号; （BB）选择具有最小|ε^ _ p-ε_p|的ε^ _p; （CC）最终估计值ε^
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公开(公告)号：KR1020130003950A
公开(公告)日：2013-01-09
申请号：KR1020110065611
申请日：2011-07-01
Applicant: 성균관대학교산학협력단
IPC: H04L27/26
CPC classification number: H04L27/2659 , H04L27/2675
Abstract: PURPOSE: A frequency offset estimating method and an apparatus performing the same are provided to adaptively measure frequency offset based on frequency offset estimating method. CONSTITUTION: A frequency offset is estimated by using a plurality of frequency offset estimating methods(S200). The first estimating method includes a step for determining a frequency offset candidate value. The final frequency offset of the received OFDM symbol is calculated by using a frequency offset value(S210). The calculated frequency offset has respectively different value through a plurality of frequency estimating method. [Reference numerals] (AA) Start; (BB) End; (S200) Estimating a frequency offset by using a plurality of frequency offset estimating methods; (S210) Calculating the final frequency offset of a received OFDM symbol by using a frequency offset value calculated through the plurality of frequency estimating methods
Abstract translation: 目的：提供一种频率偏移估计方法及其执行装置，用于基于频率偏移估计方法自适应地测量频率偏移。 构成：通过使用多个频率偏移估计方法来估计频率偏移（S200）。 第一估计方法包括用于确定频率偏移候选值的步骤。 通过使用频率偏移值来计算接收的OFDM符号的最终频率偏移（S210）。 通过多个频率估计方法，计算出的频率偏移分别具有不同的值。 （附图标记）（AA）开始; （BB）结束; （S200）通过使用多个频率偏移估计方法估计频率偏移; （S210）通过使用通过多个频率估计方法计算的频率偏移值来计算接收的OFDM符号的最终频率偏移
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公开(公告)号：KR1020130003949A
公开(公告)日：2013-01-09
申请号：KR1020110065610
申请日：2011-07-01
Applicant: 성균관대학교산학협력단
CPC classification number: H04L27/2692
Abstract: PURPOSE: A multi-step timing offset estimating method and an OFDM receiver are provided to obtain randomness of a signal path component by controlling variation due to a signal path component. CONSTITUTION: An OFDM terminal performs a first estimation step(130) estimating a timing spot of a signaling path having a large power signal. The OFDM terminal estimates timing offset of an input signal through a second estimation step(150). An OFDM signal is input to the receiver through a predetermined channel. The first estimation step includes a step for executing timing offset estimation based on a correlation function. [Reference numerals] (130) First estimation step; (150) Second estimation step; (AA) First timing offset estimation; (BB) Local signal generator; (CC) Clock; (DD) Relation; (EE) Delay; (FF) Sample average; (GG) Sample distribution
Abstract translation: 目的：提供多步定时偏移估计方法和OFDM接收机，以通过控制由信号路径分量引起的变化来获得信号路径分量的随机性。 构成：OFDM终端执行估计具有大功率信号的信令路径的定时点的第一估计步骤（130）。 OFDM终端通过第二估计步骤（150）来估计输入信号的定时偏移。 OFDM信号通过预定信道被输入到接收机。 第一估计步骤包括基于相关函数执行定时偏移估计的步骤。 （附图标记）（130）第一估计步骤; （150）第二估计步骤; （AA）第一定时偏移估计; （BB）本地信号发生器; （CC）时钟; （DD）关系; （EE）延迟; （FF）样品平均值; （GG）样品分布
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公开(公告)号：KR1020120124645A
公开(公告)日：2012-11-14
申请号：KR1020110042426
申请日：2011-05-04
Applicant: 성균관대학교산학협력단
Abstract: PURPOSE: A performance analysis method of a CSS system based on diversity combining techniques over multipath channels is provided to compare BER performance of DM-BPSK(Binary Phase Shift Keying) system of MRC, EGC(Equal Gain Combining) or SC(Selection Combining) base and analyzing BER performance of EGC and SC diversity combining technique. CONSTITUTION: A CSS(Chirp Spread Spectrum) system executes modeling of a first received signal of a rake receiver(S100). The CSS system uses a MRC(Maximal Ratio Combining) technique and a SC(Selection Combining) technique(S300) on a second received signal and a presumed channel coefficient. The CSS system calculates SINR(Signal-to-Interference plus Noise Ratio) using a generated decision variable(S400). Based on one among plural diversity combining techniques, the CSS system calculates BER(Bit Error Rate) of multipath channel(S500). [Reference numerals] (AA) Start; (BB) End; (S100) Modeling a first receiving signal, which is received in a rake receiver through a multi-path channel, in a CSS system; (S200) Generating a second receiving signal by correlation function operation of a first receiving signal and a chirp signal; (S300) Generating a determination variable for a transmission signal by applying the second receiving signal and an estimated channel coefficient to a diversity combining technique; (S400) Calculating an average SINR per channel using the determination variable; (S500) Calculating the BER of the multi-path channel based on the diversity combining technique
Abstract translation: 目的：提出一种基于多径信道分集组合技术的CSS系统的性能分析方法，以比较MRC，EGC（等增益组合）或SC（选择组合）的DM-BPSK（二进制相移键控）系统的BER性能， 基础和分析EGC和SC多样性组合技术的BER性能。 构成：CSS（Chirp Spread Spectrum）系统执行耙式接收机的第一接收信号的建模（S100）。 CSS系统使用MRC（最大比组合）技术和SC（选择组合）技术（S300）对第二接收信号和推定的信道系数。 CSS系统使用生成的决策变量来计算SINR（信号与干扰加噪声比）（S400）。 基于多种分集组合技术之一，CSS系统计算多径信道的BER（误码率）（S500）。 （附图标记）（AA）开始; （BB）结束; （S100）在CSS系统中建模通过多路径信道在rake接收机中接收的第一接收信号; （S200）通过第一接收信号和啁啾信号的相关函数运算产生第二接收信号; （S300）通过将第二接收信号和估计信道系数应用于分集合并技术，生成发送信号的判定变量; （S400）使用确定变量计算每个通道的平均SINR; （S500）基于分集组合技术计算多径信道的BER
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Patent Agency Ranking
公开(公告)号：KR101145002B1
公开(公告)日：2012-05-11
申请号：KR1020100055391
申请日：2010-06-11
Applicant: 성균관대학교산학협력단
IPC: H04L27/26
Abstract: PURPOSE: An orthogonal frequency division multiplexing(OFDM) blind frequency offset estimation method and an apparatus thereof are provided to use a symmetric alpha stable random variable, thereby performing reliable data transmission in an actual communication environment. CONSTITUTION: A time synchronization process with respect to a received orthogonal frequency division multiplexing(OFDM) signal is performed(S1). A k-th sample of the OFDM signal is expressed as an equation after the time synchronization process. A likelihood function is created using a CP(cyclic prefix) inserted in an OFDM symbol(S2). An optimal frequency offset value is estimated as the maximum of the likelihood function among frequency offset trial values in the equation(S3). A trial value applied in a Cauchy distribution likelihood function includes a set of trial values expressed as an equation.
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公开(公告)号：KR101143956B1
公开(公告)日：2012-05-09
申请号：KR1020100041695
申请日：2010-05-04
Applicant: 성균관대학교산학협력단
Abstract: 본 발명은 협력 통신 시스템 및 그의 OFDM 심볼 전송 방법에 관한 것으로, 소스 노드에서의 심볼 조합과 릴레이 노드에서의 간단한 부호 반전 및 허수곱 연산을 이용하여 시간 전환 및 이동 연산을 사용하지 않아도 목적지 노드에서 알라무티 부호 구조를 생성하여 협력 다이버시티 이득을 얻을 수 있는 효과를 기대할 수 있다.
또한, 본 발명에서는 릴레이 노드에서 순환 전치를 추가 연산하여 릴레이 노드의 시간 동기화 오류 문제를 극복할 수 있는 효과를 기대할 수 있다.-
18.发明授权다중경로 페이딩 채널에서 타이밍 오차 추정이 가능한 ＯＦＤＭ 수신기, 이를 포함하는 ＯＦＤＭ 시스템 및 이들의 타이밍 오차 추정방법 有权OFDM接收机能够估计多路径渐变信道中的时序错误，具有该通道的OFDM系统及其时序误差估计方法
公开(公告)号：KR101128287B1
公开(公告)日：2012-03-27
申请号：KR1020100055516
申请日：2010-06-11
Applicant: 성균관대학교산학협력단
IPC: H04L27/26
Abstract: 본 발명은 다중경로 페이딩 채널에서 OFDM 시스템에 발생할 수 있는 타이밍 에러를 제거하여 타이밍 오차 추정의 성능을 향상시킬 수 있는 효과가 있다. 이를 위해 특히, 수신 신호의 자기상관 기법 및 프리앰블 간의 상호상관 기법을 이용하고, 타이밍 메트릭과 필터함수를 통해 단계별 타이밍 오차 추정치를 구하여 최종 타이밍 오차 추정치를 얻을 수 있는 다중경로 페이딩 채널에서 타이밍 오차 추정이 가능한 OFDM 수신기, 이를 포함하는 OFDM 시스템 및 이들의 타이밍 오차 추정방법이 개시된다.
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19.发明公开다중경로 페이딩 채널에서 타이밍 오차 추정이 가능한 ＯＦＤＭ 수신기, 이를 포함하는 ＯＦＤＭ 시스템 및 이들의 타이밍 오차 추정방법 有权OFDM接收机能够估计多路径渐变信道中的时序错误，具有该通道的OFDM系统及其时序误差估计方法
公开(公告)号：KR1020110135662A
公开(公告)日：2011-12-19
申请号：KR1020100055516
申请日：2010-06-11
Applicant: 성균관대학교산학협력단
IPC: H04L27/26
CPC classification number: H04L27/2647 , H04L25/03006
Abstract: PURPOSE: An orthogonal frequency division multiplexing(OFDM) receiver which estimates timing errors in a multi-path fading channel, an orthogonal frequency division multiplexing system including the same, and a timing error estimation method thereof are provided to prevent inter-symbol interference(ISI), thereby correctly recovering a received signal. CONSTITUTION: A first timing estimation part(110) calculates a timing metric value based on an autocorrelation function of a received signal including a baseband orthogonal frequency division multiplexing(OFDM) samples signal. The first timing estimation part calculates a first timing estimation value based on the calculated timing metric value. A second timing estimation part(120) calculates a filtered timing metric value based on a cross-correlation function between the received signal and a preamble signal in a first timing estimation range. The second timing estimation part calculates a second timing estimation value based on the filtered timing metric value. An optimum-timing estimation part(130) calculates an optimum-timing estimation value by comparing an amplification amount.
Abstract translation: 目的：提供一种用于估计多路径衰落信道中的定时误差的正交频分复用（OFDM）接收机，包括其的正交频分复用系统及其定时误差估计方法，以防止符号间干扰（ISI ），从而正确地恢复接收到的信号。 构成：第一定时估计部分（110）基于包括基带正交频分复用（OFDM）采样信号的接收信号的自相关函数来计算定时度量值。 第一定时估计部分基于所计算的定时度量值来计算第一定时估计值。 第二定时估计部分（120）在第一定时估计范围内基于接收信号和前同步码信号之间的互相关函数来计算经滤波的定时度量值。 第二定时估计部分基于滤波的定时度量值计算第二定时估计值。 最佳定时估计部（130）通过比较放大量来计算最佳定时估计值。
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公开(公告)号：KR1020110111689A
公开(公告)日：2011-10-12
申请号：KR1020100030889
申请日：2010-04-05
Applicant: 성균관대학교산학협력단
IPC: H04J11/00
CPC classification number: H04L27/2695 , H04J11/00 , H04L25/025 , H04L25/03006
Abstract: 본 발명에 따른 OFDM 시스템에서의 훈련 심볼을 이용한 시간 옵셋 추정 방법은, 기법 1, 기법 2, 기법 3에 대해, 시간 옵셋을 추정하기 위한 모의 실험을 통해 상기 세 가지 기법에 의한 OFDM 심볼을 생성하는 단계와; 상기 OFDM 심볼을 ISI 다중경로 채널로 전송하는 단계; 상기 세 가지 기법들의 시간 측도의 값을 연산하고, 소정의 설정된 시간 옵셋 값과 각 기법들을 통해 추정한 시간 옵셋 값과의 차이를 나타내는 평균 제곱 오차(mean square error: MSE) 값을 연산하며, 각 기법들의 평균값을 연산하는 단계 및; 최적의 기법을 선택하기 위해 상기 기법들의 시간 측도의 값을 비교하고, 설정된 시간 옵셋 값을 이용하여 각 기법들을 통해 추정한 시간 옵셋 값과의 차이를 나타내는 평균 제곱 오차(MSE) 값과, 각 기법들의 평균값의 비교를 통해 각 기법의 시간 옵셋 추정 정확도를 비교하여 최적의 기법을 판단하는 단계를 갖추어 이루어진다.
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