公开(公告)号：US07577218B2

公开(公告)日：2009-08-18

申请号：US11315120

申请日：2005-12-23

Applicant: Yun-young Kim ,  Jae-hyun Koo ,  Yeon-gon Cho ,  Jae-ho Roh

Inventor： Yun-young Kim ,  Jae-hyun Koo ,  Yeon-gon Cho ,  Jae-ho Roh

IPC: H04B1/10

CPC classification number: H04L27/2656 ,  H04B1/70755 ,  H04B1/7077 ,  H04B1/7093 ,  H04L7/042 ,  H04L27/2675

Abstract: A signal acquisition apparatus and method for reducing a false alarm rate are disclosed. The apparatus includes a comparator for detecting a first peak by comparing a correlation value of a received signal with a first threshold and detecting second peaks in a sample interval of the detected first peak based on a second threshold which is different from the first threshold. Thus, a signal is acquired based on a number of the detected second peaks. Accordingly, the false alarm rate due to the noise can be reduced while the detection probability is maintained even at a high SNR.

Abstract translation: 公开了一种用于降低误报率的信号采集装置和方法。 该装置包括比较器，用于通过将接收信号的相关值与第一阈值进行比较来检测第一峰值，并且基于与第一阈值不同的第二阈值检测检测到的第一峰值的采样间隔中的第二峰值。 因此，基于检测到的第二峰值的数量获取信号。 因此，即使在高信噪比下也能够保持由于噪声引起的误报率，同时保持检测概率。

公开(公告)号：US20060140314A1

公开(公告)日：2006-06-29

申请号：US11315120

申请日：2005-12-23

Applicant: Yun-young Kim ,  Jae-hyun Koo ,  Yeon-gon Cho ,  Jae-ho Roh

Inventor： Yun-young Kim ,  Jae-hyun Koo ,  Yeon-gon Cho ,  Jae-ho Roh

IPC: H04L27/06

CPC classification number: H04L27/2656 ,  H04B1/70755 ,  H04B1/7077 ,  H04B1/7093 ,  H04L7/042 ,  H04L27/2675

Abstract: A signal acquisition apparatus and method for reducing a false alarm rate are disclosed. The apparatus includes a comparator for detecting a first peak by comparing a correlation value of a received signal with a first threshold and detecting second peaks in a sample interval of the detected first peak based on a second threshold which is different from the first threshold. Thus, a signal is acquired based on a number of the detected second peaks. Accordingly, the false alarm rate due to the noise can be reduced while the detection probability is maintained even at a high SNR.

公开(公告)号：US20060072689A1

公开(公告)日：2006-04-06

申请号：US11236596

申请日：2005-09-28

Applicant: Yun-young Kim ,  Sung-hyun Chung ,  Jae-min Ahn ,  Min-joong Rim ,  Jae-ho Roh ,  Jae-hyun Koo

Inventor： Yun-young Kim ,  Sung-hyun Chung ,  Jae-min Ahn ,  Min-joong Rim ,  Jae-ho Roh ,  Jae-hyun Koo

IPC: H04L27/06

CPC classification number: H03H17/0254 ,  H04B1/7093 ,  H04B1/71637

Abstract: Disclosed is a matched filter and a method for performing cross correlation thereof. The matched filter includes a demultiplexer for demultiplexing an input sample signal into a predetermined number of signals; and cross correlators that perform a cross correlation of each of the demultiplexed sample signals with a predetermined sequence. Therefore, when the matched filter of the present invention is applied to a UWB system having a high sampling rate, the cross correlation operation can be performed at a high rate simply by using low-rate multipliers.

Abstract translation: 公开了一种匹配滤波器及其互相关的方法。 匹配滤波器包括用于将输入采样信号解复用为预定数量的信号的解复用器; 以及交叉相关器，其执行每个解复用的采样信号与预定序列的互相关。 因此，当将本发明的匹配滤波器应用于具有高采样率的UWB系统时，可以简单地通过使用低速率乘法器以高速率执行互相关运算。

公开(公告)号：US20070019763A1

公开(公告)日：2007-01-25

申请号：US11488696

申请日：2006-07-19

Applicant: Yun-young Kim ,  Jae-ho Roh

Inventor： Yun-young Kim ,  Jae-ho Roh

IPC: H03D1/04 ,  H04L7/00

CPC classification number: H04L27/2675 ,  H04L27/2657 ,  H04L27/2679

Abstract: A sampling frequency offset estimation apparatus and method to be applied to an OFDM (orthogonal frequency division multiplexing) system are provided. The apparatus includes an ADC (analog-to-digital converter) sampling a received signal based on a predetermined sampling frequency; a FFT (Fast Fourier Transform) unit transforming the sampled received signal into a frequency domain; a phase calculator calculating phase shifts of pilot subcarriers of the sampled received signal which has been transformed into the frequency domain; a determiner calculating phase shift reaching times at which samples of the pilot subcarriers shift due to the phase shift; a time offset calculator calculating a sampling time offset using the pilot subcarriers, and a frequency offset calculator calculating a sampling frequency offset based on the phase shift reaching times and the sampling time offset.

Abstract translation: 提供了一种应用于OFDM（正交频分复用）系统的采样频率偏移估计装置和方法。 该装置包括基于预定采样频率对接收信号进行采样的ADC（模拟 - 数字转换器）; FFT（快速傅立叶变换）单元将采样的接收信号变换为频域; 计算已经被变换为频域的采样接收信号的导频子载波的相移; 一个确定器计算导频子载波的采样由于相移而移位的相移达到时间; 时间偏移计算器，使用导频子载波计算采样时间偏移;以及频率偏移计算器，基于相移到达时间和采样时间偏移来计算采样频率偏移。

公开(公告)号：US07558345B2

公开(公告)日：2009-07-07

申请号：US11341585

申请日：2006-01-30

Applicant: Yun-young Kim ,  Jae-ho Roh

Inventor： Yun-young Kim ,  Jae-ho Roh

IPC: H03D1/00

CPC classification number: H04L27/2662 ,  H04L25/0204 ,  H04L25/0212 ,  H04L27/2695

Abstract: An apparatus and method applied to an orthogonal frequency division multiplexing (OFDM) receiver performs symbol timing synchronization by correlation between channel impulse responses. The apparatus applicable to the OFDM receiver, includes a channel impulse response (CIR) estimator for estimating a CIR of a present symbol from which a symbol timing is to be detected, using a previous symbol received prior to the present symbol; a matched filter for computing the CIR using the present symbol; a correlation calculator for calculating correlation between the estimated CIR and the CIR computed at the matched filter; and a peak detector for detecting the symbol timing by obtaining a timing offset between the estimated CIR and the computed CIR based on a maximum value of the calculated correlation.

Abstract translation: 应用于正交频分复用（OFDM）接收机的装置和方法通过信道脉冲响应之间的相关来执行符号定时同步。 适用于OFDM接收机的装置包括：信道脉冲响应（CIR）估计器，用于使用在当前符号之前接收的先前符号来估计要从中检测符号定时的当前符号的CIR; 用于使用当前符号计算CIR的匹配滤波器; 相关计算器，用于计算估计的CIR和在匹配滤波器处计算的CIR之间的相关性; 以及峰值检测器，用于通过基于所计算的相关性的最大值获得所估计的CIR和所计算的CIR之间的定时偏移来检测符号定时。

公开(公告)号：US20060171493A1

公开(公告)日：2006-08-03

申请号：US11341585

申请日：2006-01-30

Applicant: Yun-young Kim ,  Jae-ho Roh

Inventor： Yun-young Kim ,  Jae-ho Roh

IPC: H04L27/06

CPC classification number: H04L27/2662 ,  H04L25/0204 ,  H04L25/0212 ,  H04L27/2695

Abstract: An apparatus and method applied to an OFDM receiver performs symbol timing synchronization by correlation between channel impulse responses. The apparatus applicable to an orthogonal frequency division multiplexing (OFDM) receiver, includes a channel impulse response (CIR) estimator for estimating a CIR of a present symbol from which a symbol timing is to be detected, using a previous symbol received prior to the present symbol; a matched filter for computing the CIR using the present symbol; a correlation calculator for calculating correlation between the estimated CIR and the CIR computed at the matched filter; and a peak detector for detecting the symbol timing by obtaining a timing offset between the estimated CIR and the computed CIR based on a maximum value of the calculated correlation.

Abstract translation: 应用于OFDM接收机的装置和方法通过信道脉冲响应之间的相关来执行符号定时同步。 适用于正交频分复用（OFDM）接收机的装置包括：信道脉冲响应（CIR）估计器，用于使用在当前之前接收的先前符号来估计要从中检测符号定时的当前符号的CIR 符号; 用于使用当前符号计算CIR的匹配滤波器; 相关计算器，用于计算估计的CIR和在匹配滤波器处计算的CIR之间的相关性; 以及峰值检测器，用于通过基于所计算的相关性的最大值获得所估计的CIR和所计算的CIR之间的定时偏移来检测符号定时。

公开(公告)号：US07702024B2

公开(公告)日：2010-04-20

申请号：US11488696

申请日：2006-07-19

Applicant: Yun-young Kim ,  Jae-ho Roh

Inventor： Yun-young Kim ,  Jae-ho Roh

IPC: H04K1/10

CPC classification number: H04L27/2675 ,  H04L27/2657 ,  H04L27/2679

Abstract: A sampling frequency offset estimation apparatus and method to be applied to an OFDM (orthogonal frequency division multiplexing) system are provided. The apparatus includes an ADC (analog-to-digital converter) sampling a received signal based on a predetermined sampling frequency; a FFT (Fast Fourier Transform) unit transforming the sampled received signal into a frequency domain; a phase calculator calculating phase shifts of pilot subcarriers of the sampled received signal which has been transformed into the frequency domain; a determiner calculating phase shift reaching times at which samples of the pilot subcarriers shift due to the phase shift; a time offset calculator calculating a sampling time offset using the pilot subcarriers, and a frequency offset calculator calculating a sampling frequency offset based on the phase shift reaching times and the sampling time offset.

Abstract translation: 提供了一种应用于OFDM（正交频分复用）系统的采样频率偏移估计装置和方法。 该装置包括基于预定采样频率对接收信号进行采样的ADC（模拟 - 数字转换器）; FFT（快速傅立叶变换）单元将采样的接收信号变换为频域; 计算已经被变换为频域的采样接收信号的导频子载波的相移; 一个确定器计算导频子载波的采样由于相移而移位的相移达到时间; 时间偏移计算器，使用导频子载波计算采样时间偏移;以及频率偏移计算器，基于相移到达时间和采样时间偏移来计算采样频率偏移。

公开(公告)号：US07509294B2

公开(公告)日：2009-03-24

申请号：US11024749

申请日：2004-12-30

Applicant: Yun-young Kim

Inventor： Yun-young Kim

IPC: G10L21/04 ,  G10L19/00 ,  G06F17/16 ,  G06F17/00

CPC classification number: G10L19/16 ,  G06F17/147 ,  G06Q99/00 ,  G10L19/0204

Abstract: A synthesis filter for an MPEG audio decoder, and a decoding method thereof. The synthesis filter for an MPEG audio decoder includes a butterfly computation part which performs a butterfly computation with respect to an input MPEG audio subband sample by a predetermined unit, a matrix computation part which performs a matrix computation using a result of the butterfly computation, a first buffer which stores a result of the matrix computation according to a predetermined address, a window computation address generation part which generates first and second addresses with respect to the first buffer to use for each cycle of the window computation, a window computation part which outputs the matrix computation result stored to the first and second addresses to perform the window computation, and an output part which outputs a result of the window computation.

Abstract translation: 一种用于MPEG音频解码器的合成滤波器及其解码方法。 用于MPEG音频解码器的合成滤波器包括蝶形计算部分，该蝶形计算部分相对于输入的MPEG音频子带样本由预定单元执行蝶形运算，使用蝴蝶计算结果执行矩阵运算的矩阵运算部分， 第一缓冲器，其根据预定地址存储矩阵计算的结果;窗口计算地址生成部，其生成相对于用于窗口计算的每个周期的第一缓冲器的第一和第二地址;窗口计算部，其输出 存储到第一和第二地址以执行窗口计算的矩阵计算结果以及输出窗口计算结果的输出部分。

公开(公告)号：US07627049B2

公开(公告)日：2009-12-01

申请号：US11445255

申请日：2006-06-02

Applicant: Yun-young Kim

Inventor： Yun-young Kim

IPC: H04K1/10

CPC classification number: H04B1/7183 ,  H04L27/266 ,  H04L27/2662 ,  H04L27/2675

Abstract: A sampling frequency offset tracking method in an orthogonal frequency division multiplexing (OFDM) system includes determining a search direction of maximum likelihood estimation (MLE) using a carrier frequency offset estimated using pilot subcarriers of a received signal; calculating a size of a MLE search region using a maximum sampling frequency offset of the OFDM system and a resolution of the MLE; calculating a range of the MLE search region for each OFDM symbol based on the size of the MLE search region; and tracking the sampling frequency offset by calculating a maximum correlation between the pilot subcarriers and reference pilot subcarriers within the MLE search region each OFDM symbol. Accordingly, the search region of the MLE is reduced according to the sign of the estimated carrier frequency offset. Therefore, the sampling frequency offset can be easily tracked and the estimation error can be reduced.

Abstract translation: 正交频分复用（OFDM）系统中的采样频率偏移跟踪方法包括使用接收信号的导频子载波估计的载波频率偏移来确定最大似然估计（MLE）的搜索方向; 使用OFDM系统的最大采样频率偏移和MLE的分辨率来计算MLE搜索区域的大小; 基于MLE搜索区域的大小计算每个OFDM符号的MLE搜索区域的范围; 以及通过计算每个OFDM符号的MLE搜索区域内的导频子载波和参考导频子载波之间的最大相关性来跟踪采样频率偏移。 因此，根据估计的载波频率偏移的符号，MLE的搜索区域被减少。 因此，可以容易地跟踪采样频率偏移，并且可以减小估计误差。

公开(公告)号：US20070041312A1

公开(公告)日：2007-02-22

申请号：US11445255

申请日：2006-06-02

Applicant: Yun-young Kim

Inventor： Yun-young Kim

IPC: H04J11/00

CPC classification number: H04B1/7183 ,  H04L27/266 ,  H04L27/2662 ,  H04L27/2675

Abstract: A sampling frequency offset tracking method in an orthogonal frequency division multiplexing (OFDM) system includes determining a search direction of maximum likelihood estimation (MLE) using a carrier frequency offset estimated using pilot subcarriers of a received signal; calculating a size of a MLE search region using a maximum sampling frequency offset of the OFDM system and a resolution of the MLE; calculating a range of the MLE search region for each OFDM symbol based on the size of the MLE search region; and tracking the sampling frequency offset by calculating a maximum correlation between the pilot subcarriers and reference pilot subcarriers within the MLE search region each OFDM symbol. Accordingly, the search region of the MLE is reduced according to the sign of the estimated carrier frequency offset. Therefore, the sampling frequency offset can be easily tracked and the estimation error can be reduced.

Abstract translation: 正交频分复用（OFDM）系统中的采样频率偏移跟踪方法包括使用接收信号的导频子载波估计的载波频率偏移来确定最大似然估计（MLE）的搜索方向; 使用OFDM系统的最大采样频率偏移和MLE的分辨率来计算MLE搜索区域的大小; 基于MLE搜索区域的大小计算每个OFDM符号的MLE搜索区域的范围; 以及通过计算每个OFDM符号的MLE搜索区域内的导频子载波和参考导频子载波之间的最大相关性来跟踪采样频率偏移。 因此，根据估计的载波频率偏移的符号，MLE的搜索区域被减少。 因此，可以容易地跟踪采样频率偏移，并且可以减小估计误差。