公开(公告)号：US08446990B2

公开(公告)日：2013-05-21

申请号：US12194091

申请日：2008-08-19

申请人： Guanghui Liu

发明人： Guanghui Liu

IPC分类号： H03D1/00 ,  H04L27/06

CPC分类号： H04L27/266 ,  H04L25/0212 ,  H04L25/0224 ,  H04L27/2659 ,  H04L27/2675 ,  H04L27/2678

摘要： A carrier frequency offset (CFO) estimation and synchronization method and apparatus of an orthogonal frequency division multiplexing (OFDM) receiver receiving an OFDM modulated signal. The OFDM receiver's CFO synchronization method includes step (a) performing an initial CFO estimation pull-in step using double correlation, step (b) performing a coarse residue CFO estimate acquisition step using independent combination of the double correlation and auto-correlation, and step (c) performing a small residue CFO tracking step by using the double correlation. Aspects of the invention solves the problems in the related art that a CFO tracking range cannot be reliably used in practice when the CFO tracking range is too narrow and a CFO estimation error increases when the CFO tracking range is too wide.

摘要翻译： 接收OFDM调制信号的正交频分复用（OFDM）接收机的载波频率偏移（CFO）估计和同步方法和装置。 OFDM接收机的CFO同步方法包括步骤（a）使用双重相关执行初始CFO估计引入步骤，步骤（b）使用双重相关和自相关的独立组合执行粗略残差CFO估计获取步骤，步骤 （c）通过使用双重相关来执行小残留CFO跟踪步骤。 本发明的方面解决了现有技术中的问题，即当CFO跟踪范围太窄时CFO跟踪范围在CFO跟踪范围太宽时CFO估计误差增加时，在实践中不能可靠地使用CFO跟踪范围。

公开(公告)号：US07869545B2

公开(公告)日：2011-01-11

申请号：US11752394

申请日：2007-05-23

申请人： Guanghui Liu

发明人： Guanghui Liu

IPC分类号： H04L27/06

CPC分类号： H04L25/0232 ,  H04L27/2647

摘要： A channel estimation method and apparatus based on two adjacent windows. The channel estimation method includes scanning a signal containing noise and channel impulse response (CIR) information with a first window and a second window, detecting a CIR distribution area based on the ratio between the average power of the signal within the first window and the average power of the signal within the second window and at least one threshold value, eliminating the noise from the CIR distribution area and estimating the CIR information. Accordingly, noise interference can be minimized and accurate channel estimation can be accomplished.

摘要翻译： 一种基于两个相邻窗口的信道估计方法和装置。 信道估计方法包括利用第一窗口和第二窗口扫描包含噪声和信道脉冲响应（CIR）信息的信号，基于第一窗口内的信号的平均功率与平均值之间的比率来检测CIR分布区域 第二窗口内的信号的功率和至少一个阈值，消除来自CIR分配区域的噪声并估计CIR信息。 因此，可以使噪声干扰最小化并且可以实现准确的信道估计。

公开(公告)号：US20080049600A1

公开(公告)日：2008-02-28

申请号：US11744627

申请日：2007-05-04

申请人： Guanghui Liu

发明人： Guanghui Liu

IPC分类号： H04J11/00 ,  H04B3/04

CPC分类号： H04L27/2647 ,  H04L25/0212 ,  H04L25/0224 ,  H04L25/03159 ,  H04L25/03292

摘要： A channel estimation method and system using linear correlation based interference cancellation combined with decision-feedback-equalization (LCIC-DFE) are provided. The channel estimation method includes generating a first correlation sequence by calculating a linear correlation between a baseband sampled complex signal and a locally stored pseudo-noise signal and obtaining a second correlation sequence by iteratively removing inter-path interference from the first correlation sequence and generating a first channel impulse response (CIR) sequence based on the second correlation sequence. And, obtaining a third correlation sequence by removing random-data interference from the second correlation sequence based on the first CIR sequence and a feedback signal and generating a second CIR sequence based on the third correlation sequence.

摘要翻译： 提供了一种使用基于线性相关的干扰消除与决策反馈均衡（LCIC-DFE）结合的信道估计方法和系统。 信道估计方法包括：通过计算基带采样复信号和本地存储的伪噪声信号之间的线性相关来产生第一相关序列，并通过迭代地从第一相关序列中去除路径间干扰并产生第 基于第二相关序列的第一信道脉冲响应（CIR）序列。 并且，通过基于第一CIR序列和反馈信号从第二相关序列去除随机数据干扰并基于第三相关序列生成第二CIR序列来获得第三相关序列。

公开(公告)号：US08295339B2

公开(公告)日：2012-10-23

申请号：US12193075

申请日：2008-08-18

申请人： Guanghui Liu

发明人： Guanghui Liu

IPC分类号： H03H7/30

CPC分类号： H04L25/03159 ,  H04L25/0202 ,  H04L2025/03414 ,  H04L2025/03522

摘要： An inter-carrier interference (ICI) mitigating equalizer includes a channel estimator, a channel calculator, an ICI estimator, a subtracter, and an equalizer. The channel estimator estimates a channel response from a received signal, and the channel calculator calculates a basic component of a channel response and fluctuating components of the channel response from the estimated channel response. The ICI estimator multiplies the fluctuating components of the channel response by a received signal in a frequency domain, filters the multiplication results according to filter coefficients, and estimates an ICI component included in the received signal based on the filtering results. The subtracter subtracts the ICI component from the received signal in the frequency domain. The equalizer equalizes an output signal of the subtracter based on the basic component of the channel response.

摘要翻译： 载波间干扰（ICI）减轻均衡器包括信道估计器，信道计算器，ICI估计器，减法器和均衡器。 信道估计器从接收信号估计信道响应，并且信道计算器从估计的信道响应计算信道响应的基本分量和信道响应的波动分量。 ICI估计器将频道响应的波动分量乘以频域中的接收信号，根据滤波器系数对乘法结果进行滤波，并根据滤波结果估计包含在接收信号中的ICI分量。 减法器从频域的接收信号中减去ICI分量。 均衡器基于信道响应的基本分量来平衡减法器的输出信号。

公开(公告)号：US07933366B2

公开(公告)日：2011-04-26

申请号：US11744627

申请日：2007-05-04

申请人： Guanghui Liu

发明人： Guanghui Liu

IPC分类号： H03D1/00 ,  H04L27/06

CPC分类号： H04L27/2647 ,  H04L25/0212 ,  H04L25/0224 ,  H04L25/03159 ,  H04L25/03292

摘要： A channel estimation method and system using linear correlation based interference cancellation combined with decision-feedback-equalization (LCIC-DFE) are provided. The channel estimation method includes generating a first correlation sequence by calculating a linear correlation between a baseband sampled complex signal and a locally stored pseudo-noise signal and obtaining a second correlation sequence by iteratively removing inter-path interference from the first correlation sequence and generating a first channel impulse response (CIR) sequence based on the second correlation sequence. And, obtaining a third correlation sequence by removing random-data interference from the second correlation sequence based on the first CIR sequence and a feedback signal and generating a second CIR sequence based on the third correlation sequence.

摘要翻译： 提供了一种使用基于线性相关的干扰消除与决策反馈均衡（LCIC-DFE）结合的信道估计方法和系统。 信道估计方法包括：通过计算基带采样复信号和本地存储的伪噪声信号之间的线性相关来产生第一相关序列，并通过迭代地从第一相关序列中去除路径间干扰并产生第 基于第二相关序列的第一信道脉冲响应（CIR）序列。 并且，通过基于第一CIR序列和反馈信号从第二相关序列去除随机数据干扰并基于第三相关序列生成第二CIR序列来获得第三相关序列。

公开(公告)号：US08040990B2

公开(公告)日：2011-10-18

申请号：US12173078

申请日：2008-07-15

申请人： Guanghui Liu

发明人： Guanghui Liu

IPC分类号： H04L7/00

CPC分类号： H04L7/0029 ,  H04L7/007

摘要： An apparatus for estimating a sampling frequency offset includes a waveform characteristic extraction unit, a variation quantity calculation unit, and a SFO (sampling frequency offset) estimator. The waveform characteristic extraction unit extracts a waveform characteristic of a training sequence period in one frame period of a sample data signal and outputs a waveform characteristic value corresponding to the waveform characteristic of the training sequence period. The variation quantity calculation unit calculates a waveform characteristic variation quantity representing a variation quantity in waveform characteristic between an m-th frame and an (m−k)-th frame based on a waveform characteristic value in the m-th frame and a waveform characteristic value in the (m−k)-th frame, where m and k are independently integers of 1 or more. The SFO estimator estimates an SFO of the sample data signal based on the waveform characteristic variation quantity.

摘要翻译： 用于估计采样频率偏移的装置包括波形特征提取单元，变化量计算单元和SFO（采样频率偏移）估计器。 波形特征提取单元在采样数据信号的一个帧周期中提取训练序列周期的波形特性，并输出与训练序列周期的波形特性对应的波形特征值。 变化量计算单元基于第m帧中的波形特性值和波形特性来计算表示第m帧和第（m-k）帧之间的波形特性的变化量的波形特性变化量 （m-k）帧中的值，其中m和k独立地为1以上的整数。 SFO估计器基于波形特征变化量来估计采样数据信号的SFO。

公开(公告)号：US20090022236A1

公开(公告)日：2009-01-22

申请号：US12173078

申请日：2008-07-15

申请人： Guanghui Liu

发明人： Guanghui Liu

IPC分类号： H04L7/00

CPC分类号： H04L7/0029 ,  H04L7/007

摘要： An apparatus for estimating a sampling frequency offset includes a waveform characteristic extraction unit, a variation quantity calculation unit, and a SFO (sampling frequency offset) estimator. The waveform characteristic extraction unit extracts a waveform characteristic of a training sequence period in one frame period of a sample data signal and outputs a waveform characteristic value corresponding to the waveform characteristic of the training sequence period. The variation quantity calculation unit calculates a waveform characteristic variation quantity representing a variation quantity in waveform characteristic between an m-th frame and an (m−k)-th frame based on a waveform characteristic value in the m-th frame and a waveform characteristic value in the (m−k)-th frame, where m and k are independently integers of 1 or more. The SFO estimator estimates an SFO of the sample data signal based on the waveform characteristic variation quantity.

摘要翻译： 用于估计采样频率偏移的装置包括波形特征提取单元，变化量计算单元和SFO（采样频率偏移）估计器。 波形特征提取单元在采样数据信号的一个帧周期中提取训练序列周期的波形特性，并输出与训练序列周期的波形特性对应的波形特征值。 变化量计算单元基于第m帧中的波形特性值和第m帧中的波形特性值，计算表示第m帧和第（mk）帧之间的波形特性的变化量的波形特性变化量， （mk）个帧，其中m和k独立地为1或更大的整数。 SFO估计器基于波形特征变化量来估计采样数据信号的SFO。

公开(公告)号：US20080137723A1

公开(公告)日：2008-06-12

申请号：US11752384

申请日：2007-05-23

申请人： Guanghui Liu

发明人： Guanghui Liu

IPC分类号： H04B7/005 ,  H04J11/00

CPC分类号： H04L25/03006 ,  H04L25/0232 ,  H04L2025/03414 ,  H04L2025/03605

摘要： An equalization method and apparatus for a Time domain synchronous orthogonal frequency division multiplexing (TDS-OFDM) receiver. The equalization method includes estimating a channel impulse response (CIR) based on a baseband sampled complex signal and locally stored pseudo-noise; eliminating the pseudo-noise from the baseband sampled complex signal based on the CIR; computing channel information including first channel information and second channel information from the CIR; performing pre-fast Fourier transform (FFT) compensation of a pseudo-noise eliminated signal based on the first channel information; performing FFT of a pre-FFT compensated signal; and equalizing a fast Fourier transformed signal based on the second channel information.

摘要翻译： 一种用于时域同步正交频分复用（TDS-OFDM）接收机的均衡方法和装置。 均衡方法包括基于基带采样复信号和本地存储的伪噪声来估计信道脉冲响应（CIR）; 基于CIR从基带采样复信号中消除伪噪声; 从CIR计算包括第一信道信息和第二信道信息的信道信息; 基于所述第一信道信息执行伪噪声消除信号的快速傅里叶变换（FFT）补偿; 执行预FFT补偿信号的FFT; 以及基于所述第二信道信息来均衡快速傅里叶变换信号。

公开(公告)号：US20090060101A1

公开(公告)日：2009-03-05

申请号：US12194091

申请日：2008-08-19

申请人： Guanghui Liu

发明人： Guanghui Liu

IPC分类号： H04L27/06

CPC分类号： H04L27/266 ,  H04L25/0212 ,  H04L25/0224 ,  H04L27/2659 ,  H04L27/2675 ,  H04L27/2678

摘要： A carrier frequency offset (CFO) estimation and synchronization method and apparatus of an orthogonal frequency division multiplexing (OFDM) receiver receiving an OFDM modulated signal. The OFDM receiver's CFO synchronization method includes step (a) performing an initial CFO estimation pull-in step using double correlation, step (b) performing a coarse residue CFO estimate acquisition step using independent combination of the double correlation and auto-correlation, and step (c) performing a small residue CFO tracking step by using the double correlation. Aspects of the invention solves the problems in the related art that a CFO tracking range cannot be reliably used in practice when the CFO tracking range is too narrow and a CFO estimation error increases when the CFO tracking range is too wide.

摘要翻译： 接收OFDM调制信号的正交频分复用（OFDM）接收机的载波频率偏移（CFO）估计和同步方法和装置。 OFDM接收机的CFO同步方法包括步骤（a）使用双重相关执行初始CFO估计引入步骤，步骤（b）使用双重相关和自相关的独立组合执行粗略残差CFO估计获取步骤，步骤 （c）通过使用双重相关来执行小残留CFO跟踪步骤。 本发明的方面解决了现有技术中的问题，即当CFO跟踪范围太窄时CFO跟踪范围在CFO跟踪范围太宽时CFO估计误差增加时，在实践中不能可靠地使用CFO跟踪范围。

公开(公告)号：US07792203B2

公开(公告)日：2010-09-07

申请号：US11752384

申请日：2007-05-23

申请人： Guanghui Liu

发明人： Guanghui Liu

IPC分类号： H04L27/28 ,  H04B1/10

CPC分类号： H04L25/03006 ,  H04L25/0232 ,  H04L2025/03414 ,  H04L2025/03605

摘要： An equalization method and apparatus for a Time domain synchronous orthogonal frequency division multiplexing (TDS-OFDM) receiver. The equalization method includes estimating a channel impulse response (CIR) based on a baseband sampled complex signal and locally stored pseudo-noise; eliminating the pseudo-noise from the baseband sampled complex signal based on the CIR; computing channel information including first channel information and second channel information from the CIR; performing pre-fast Fourier transform (FFT) compensation of a pseudo-noise eliminated signal based on the first channel information; performing FFT of a pre-FFT compensated signal; and equalizing a fast Fourier transformed signal based on the second channel information.

摘要翻译： 一种用于时域同步正交频分复用（TDS-OFDM）接收机的均衡方法和装置。 均衡方法包括基于基带采样复信号和本地存储的伪噪声来估计信道脉冲响应（CIR）; 基于CIR从基带采样复信号中消除伪噪声; 从CIR计算包括第一信道信息和第二信道信息的信道信息; 基于所述第一信道信息执行伪噪声消除信号的快速傅里叶变换（FFT）补偿; 执行预FFT补偿信号的FFT; 以及基于所述第二信道信息来均衡快速傅里叶变换信号。