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Patent Agency Ranking
公开(公告)号：KR1020100057439A
公开(公告)日：2010-05-31
申请号：KR1020080116480
申请日：2008-11-21
Applicant: 성균관대학교산학협력단
CPC classification number: H04L25/0208 , H04L25/0212 , H04L25/022 , H04L25/0224 , H04L25/03159 , H04L2025/03414 , H04L2025/03611 , H04J11/00
Abstract: PURPOSE: A method and a device for estimating a revised channel in a wireless communication system are provided to improve the performance of the wireless communication system by improving the error due to the delay position concentration of multiple path channels. CONSTITUTION: A first Fourier converter(130) changes received orthogonal frequency division multiplexing signal into a frequency domain. A channel estimation unit(140) estimates a channel frequency response value using pilot signal. An inverse Fourier converter(150) converts the estimated value to time domain and obtain a channel impulse response value. A delay path detector(160) detects a delay path position. A channel estimation error compensation unit calculates transformed self correlation function and compensates the error of the estimated channel impulse response value using the delay path position and the self correlation function.
Abstract translation: 目的：提供一种用于估计无线通信系统中的经修改的信道的方法和装置，以通过改善由多个路径信道的延迟位置集中引起的误差来提高无线通信系统的性能。 构成：第一傅里叶变换器（130）将接收到的正交频分复用信号改变为频域。 信道估计单元（140）使用导频信号来估计信道频率响应值。 逆傅里叶变换器（150）将估计值转换为时域并获得信道脉冲响应值。 延迟路径检测器（160）检测延迟路径位置。 信道估计误差补偿单元使用延迟路径位置和自相关函数来计算变换后的自相关函数并补偿所估计的信道脉冲响应值的误差。
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公开(公告)号：KR100917708B1
公开(公告)日：2009-09-21
申请号：KR1020070065529
申请日：2007-06-29
Applicant: 한국전자통신연구원 , 성균관대학교산학협력단
Abstract: 데이터 전송 장치는 복수의 디지털 변조 심볼을 복수의 부반송파에 할당하여 복수의 부반송파 신호를 생성하고, 복수의 시퀀스 중 어느 하나의 시퀀스를 복수의 부반송파 신호에 적용하여 복수의 시퀀스 적용 신호를 생성한다. 이후 복수의 시퀀스 적용 신호를 푸리에 역변환 하여 복수의 푸리에 역변환 심볼을 생성하고, 복수의 푸리에 역변환 심볼에 대한 첨두 대 평균 전력 비를 계산하여, 첨두 대 평균 전력 비가 임계값보다 큰 경우 복수의 시퀀스 중 다른 하나의 시퀀스를 복수의 부반송파 신호에 적용하여 복수의 시퀀스 적용 신호를 생성한다. 이를 통해 전송되는 데이터의 첨두 대 평균 전력 비를 감소 시킬 수 있다.
OFDM, SLM, PAPR, 위상-
公开(公告)号：KR1020090066170A
公开(公告)日：2009-06-23
申请号：KR1020070133811
申请日：2007-12-18
Applicant: 한국전자통신연구원 , 성균관대학교산학협력단
IPC: H04L27/26
CPC classification number: H04L5/0051 , H04L25/0224 , H04L25/03292 , H04L27/2613 , H04L27/2647
Abstract: An apparatus and a method for transmitting/receiving data are provided to reduce interference about a proximity data signal by generating a power of a pilot signal smaller than a power of a data signal. An adding part(110) adds a pilot signal to a data signal of a frequency domain. An IFFT(Inverse Fast Fourier Transform) part(120) transforms a data signal of the frequency domain including the pilot signal outputted from the adding part into a signal of a time domain. A protecting section insertion part(130) additionally inserts a protecting section to the signal of the time domain outputted from the IFFT part. A digital to analog converting part(140) converts a digital signal outputted from the protecting section insertion part into an analog signal. A RF processing part(150) includes a filter and components like preprocessing. The RF processing part performs a RF process about a signal outputted from the digital to analog converting part.
Abstract translation: 提供了一种用于发送/接收数据的装置和方法，用于通过产生小于数据信号的功率的导频信号的功率来减少对接近数据信号的干扰。 加法部分（110）将导频信号添加到频域的数据信号。 IFFT（逆快速傅里叶变换）部分（120）将包括从加法部分输出的导频信号的频域的数据信号变换成时域的信号。 保护部分插入部分（130）另外将保护部分插入到从IFFT部分输出的时域的信号上。 数模转换部（140）将从保护部插入部输出的数字信号变换为模拟信号。 RF处理部分（150）包括滤波器和诸如预处理的部件。 RF处理部分对从数模转换部分输出的信号执行RF处理。
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公开(公告)号：KR1020080112485A
公开(公告)日：2008-12-26
申请号：KR1020070060947
申请日：2007-06-21
Applicant: 한국전자통신연구원 , 성균관대학교산학협력단
CPC classification number: H04L27/2626 , H04L25/0204 , H04L27/2666 , H04L27/2695
Abstract: A method for OFDM(Orthogonal Frequency Division Multiplexing) communications capable of improving receiving performance of OFDM system using pilot signal and apparatus thereof are provided to steadily receive various adding data service during high speed moving. A method for OFDM(Orthogonal Frequency Division Multiplexing) communications capable of improving receiving performance of OFDM system using pilot signal comprises the following steps: a step for receiving a media signal from outside(501); a step for encoding/modulating an inputted digital signal(503, 505); and a step for inserting a pilot signal in a protective section of a modulated digital signal(513). The digital modulation step includes a step of a reverse fourier transforming(509) a signal which is orthogonally modulated.
Abstract translation: 提供了一种使用导频信号提高OFDM系统的接收性能的OFDM（正交频分复用）通信方法及其装置，用于在高速移动期间稳定地接收各种附加数据业务。 一种能够使用导频信号改善OFDM系统的接收性能的OFDM（正交频分复用）通信方法包括以下步骤：从外部接收媒体信号的步骤（501）; 用于对输入的数字信号进行编码/调制的步骤（503,505）; 以及用于将导频信号插入调制数字信号（513）的保护部分中的步骤。 数字调制步骤包括逆向傅立叶变换（509）正交调制信号的步骤。
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公开(公告)号：KR1020080066122A
公开(公告)日：2008-07-16
申请号：KR1020070003158
申请日：2007-01-11
Applicant: 성균관대학교산학협력단
CPC classification number: H04L27/2656 , H04L7/041 , H04L27/2613 , H04L27/2675 , H04J13/0059 , H04L2025/0377
Abstract: A training sequence setting method for a wireless communication system is provided to perform the frame synchronization stably in a low cost wireless communication system. A training sequence is set, so that a correlation property obtained through the correlation process of a training sequence by means of a differential detection manner and a correlation property obtained through the correlation process of a training sequence by means of a simple correlation manner have the similar result. A training sequence(310) is inputted by a switching operation before a data and control signal. Thereafter, the training sequence is transmitted on the wireless channel through a D/A(Digital/Analog) converter(320) and an RF(Radio Frequency) processor(330). A receiving member comprises an RF processor(340), an A/D(Analog/Digital) converter(350) and a differential detection based frame synchronization(300). The differential detection based frame synchronization comprises a delay and complex conjugate(360), a correlator(370), a maximum correlation value detection member(380) and a timing controller(390).
Abstract translation: 提供了一种用于无线通信系统的训练序列设置方法，用于在低成本无线通信系统中稳定地执行帧同步。 设置训练序列，使得通过差分检测方式通过训练序列的相关处理获得的相关性和通过简单相关方式通过训练序列的相关处理获得的相关性具有相似性 结果。 在数据和控制信号之前通过切换操作输入训练序列（310）。 此后，通过D / A（数字/模拟）转换器（320）和RF（射频）处理器（330）在无线信道上发送训练序列。 接收构件包括RF处理器（340），A / D（模拟/数字）转换器（350）和基于差分检测的帧同步（300）。 基于差分检测的帧同步包括延迟和复共轭（360），相关器（370），最大相关值检测构件（380）和定时控制器（390）。
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