公开(公告)号：US07953164B2

公开(公告)日：2011-05-31

申请号：US11594994

申请日：2006-11-09

申请人： Wenzhen Li ,  Zhongjun Wang ,  Yanxin Yan ,  Masayuki Tomisawa

发明人： Wenzhen Li ,  Zhongjun Wang ,  Yanxin Yan ,  Masayuki Tomisawa

IPC分类号： H04L27/28

CPC分类号： H04L25/03292 ,  H04B1/7163 ,  H04L25/03159 ,  H04L27/2647

摘要： A system for performing LS equalization on a signal in an OFDM system comprises a receiver stage for receiving a modulated signal, a demodulation stage for demodulating the received modulated signal to produce a demodulated signal, a channel estimation stage for processing the demodulated signal to provide an output signal corresponding to a channel frequency response and an equalization stage arranged to process the output signal from the channel estimation stage to produce a channel state information signal. The equalization stage is arranged to use the channel state information signal to operate on the demodulated signal from the demodulation stage to produce an equalized demodulated output signal. There is also disclosed a method for performing LS equalization on a signal in an OFDM system.

摘要翻译： 用于在OFDM系统中对信号执行LS均衡的系统包括用于接收调制信号的接收机级，用于解调所接收的调制信号以产生解调信号的解调级，用于处理解调信号以提供解调信号的信道估计级 对应于信道频率响应的输出信号和均衡级，被配置为处理来自信道估计级的输出信号以产生信道状态信息信号。 均衡级被设置为使用信道状态信息信号对来自解调级的解调信号进行操作，以产生均衡的解调输出信号。 还公开了一种在OFDM系统中对信号执行LS均衡的方法。

公开(公告)号：US20090074050A1

公开(公告)日：2009-03-19

申请号：US12233064

申请日：2008-09-18

申请人： Zhongjun Wang ,  Lee Guek Yeo ,  Zhi Ping Li ,  Saigui Hu ,  Yanxin Yan ,  Qi Jun Xu ,  Yu Jing Ting ,  Masayuki Tomisawa

发明人： Zhongjun Wang ,  Lee Guek Yeo ,  Zhi Ping Li ,  Saigui Hu ,  Yanxin Yan ,  Qi Jun Xu ,  Yu Jing Ting ,  Masayuki Tomisawa

IPC分类号： H03K5/159

CPC分类号： H04L25/022 ,  H04L1/0047 ,  H04L5/0016 ,  H04L25/0246 ,  H04L25/025 ,  H04L25/03159 ,  H04L25/03197 ,  H04L25/03286 ,  H04L25/067 ,  H04L27/0008 ,  H04L2025/03414 ,  H04L2025/03426

摘要： Method and apparatus for receiving coded signals with the aid of CSI are provided. The method comprises: performing channel estimation to obtain a CFR estimation vector; computing a squared magnitude of the CFR estimation vector, and obtaining a normalization factor α by averaging the squared magnitudes of CFR estimations on all N subcarriers; finding a norm-shift operand m satisfying the condition that α0=2m is a power of 2 number closest to the normalization factor α; performing a CSI-aided one-tap channel equalization on an output signal vector from a DFT processor by using the norm-shift operand m; performing constellation demapping; and performing channel decoding. The method further comprises obtaining a weighting factor vector by right shifting m bits of the squared magnitude of the CFR estimation vector so that the constellation demapping can use the weighted decision boundary values in case that its input signal is sensitive to both amplitude and phase.

摘要翻译： 提供了借助于CSI接收编码信号的方法和装置。 该方法包括：执行信道估计以获得CFR估计向量; 计算CFR估计向量的平方幅度，并且通过对所有N个子载波上的CFR估计的平方幅度进行平均来获得归一化因子α; 找到满足α0= 2m的条件的范数移位操作数m是最接近归一化因子α的2个数的幂; 通过使用范数移位操作数m对来自DFT处理器的输出信号向量执行CSI辅助一抽头信道均衡; 进行星座解映射; 并执行信道解码。 该方法还包括通过右移量CFR估计向量的平方幅度的m位来获得加权因子向量，使得在其输入信号对幅度和相位都敏感的情况下，星座解映射可以使用加权的判定边界值。

公开(公告)号：US08416676B2

公开(公告)日：2013-04-09

申请号：US12926523

申请日：2010-11-23

申请人： Zhongjun Wang ,  Masayuki Tomisawa

发明人： Zhongjun Wang ,  Masayuki Tomisawa

IPC分类号： H04J11/00 ,  H04Q11/00 ,  H04L27/00 ,  H04K1/10

CPC分类号： H04L27/266 ,  H04L27/2662 ,  H04L27/2675 ,  H04L27/2695

摘要： An apparatus for sampling clock recovery (SCO) and methods for estimating and compensating SCO are provided. The apparatus comprises a symbol timing adjustment module for shifting forward or backward symbol timing of the transmitted OFDM symbols; a discrete Fourier transform (DFT) processor for performing DFT to an output from the symbol timing adjustment module; a channel estimator for undertaking a channel frequency response estimation based on a channel estimation sequence; a SCO phase rotator for receiving and performing phase shift on the transmitted OFDM symbols of a frame header and a frame payload; an SCO estimation stage for undertaking an SCO estimation based on a pilot-subcarrier-related output of the SCO phase rotator and the CFR estimation; and an SCO compensation distributor for dividing the SCO estimation into integer and fractional portions and then distributing them into the symbol timing adjustment module and the SCO phase rotator, respectively.

摘要翻译： 提供了一种用于采样时钟恢复（SCO）的装置以及用于估计和补偿SCO的方法。 该装置包括用于移位所发送的OFDM符号的正向或反向符号定时的符号定时调整模块; 离散傅里叶变换（DFT）处理器，用于对符号定时调整模块的输出执行DFT; 信道估计器，用于基于信道估计序列进行信道频率响应估计; SCO相位旋转器，用于在帧头和帧有效载荷的发射OFDM符号上接收和执行相移; SCO估计级，用于基于SCO相位旋转器的导频子载波相关输出和CFR估计进行SCO估计; 以及SCO补偿分配器，用于将SCO估计分成整数和小数部分，然后将它们分配到符号定时调整模块和SCO相位旋转器中。

公开(公告)号：US20070258381A1

公开(公告)日：2007-11-08

申请号：US11417511

申请日：2006-05-04

申请人： James Lichtenauer ,  Wayne Zhao ,  Zhongjun Wang ,  Ashok Bansal ,  Robert Schmitt ,  Richard Holman ,  James Williams ,  William Williams

发明人： James Lichtenauer ,  Wayne Zhao ,  Zhongjun Wang ,  Ashok Bansal ,  Robert Schmitt ,  Richard Holman ,  James Williams ,  William Williams

IPC分类号： H04J1/16 ,  H04L12/26

CPC分类号： H04L41/22 ,  H04L43/045 ,  H04L43/065 ,  H04L43/18

摘要： This disclosure provides a system and method for managing inventory of and space assignment in main distributing frames associated with a telephone network. The system includes a database that stores frame information and a server that uses the database and executes instructions contained in a computer program to maintain current inventory of the frames, including the equipment terminated on the frames and their allocated space. The server assigns the space for terminating new equipment on the frames and allocates the space to balance the load condition on the frames.

摘要翻译： 本公开提供了一种用于管理与电话网络相关联的主分配帧中的库存和空间分配的系统和方法。 该系统包括存储帧信息的数据库和使用数据库并执行包含在计算机程序中的指令的服务器，以维护帧的当前清单，包括终止在帧上的设备及其分配的空间。 服务器在帧上分配用于终止新设备的空间，并分配空间以平衡帧上的负载条件。

公开(公告)号：US07260055B2

公开(公告)日：2007-08-21

申请号：US10449992

申请日：2003-05-30

申请人： Zhongjun Wang ,  Lee Guek Yeo ,  Xiaodan Gan

发明人： Zhongjun Wang ,  Lee Guek Yeo ,  Xiaodan Gan

IPC分类号： H04J9/00 ,  H04J11/00 ,  H04J1/16 ,  H03D1/00

CPC分类号： H04L25/022 ,  H04L25/0228 ,  H04L27/265 ,  H04L2025/03414

摘要： A method for channel response estimation for an OFDM communication system based on a certain normal training symbols plus one virtual training symbol begins with receiving at least one preamble symbol of a transmitted data frame. A first channel state information is estimated from the at least one preamble symbol. At least one signalling symbol is then received and equalized and a rate factor and a length factor are extracted from the at least one signalling symbol. A virtual training symbol is formed from the rate factor and the length factor. A second channel state information is estimated from the at least one preamble symbol and the virtual training symbol. The data symbols are equalized by performing channel correction on data symbols with the second channel estimation and pilot sub-carriers in each of the plurality of data symbols.

摘要翻译： 基于某些正常训练符号加上一个虚拟训练符号的OFDM通信系统的信道响应估计方法开始于接收发射数据帧的至少一个前导符号。 从至少一个前导符号估计第一信道状态信息。 然后接收和均衡至少一个信令符号，并且从至少一个信令符号提取速率因子和长度因子。 虚拟训练符号由速率因子和长度因子形成。 从至少一个前导符号和虚拟训练符号估计第二信道状态信息。 通过对数据符号进行信道校正，通过在多个数据符号中的每一个中的第二信道估计和导频子载波来均衡数据符号。

公开(公告)号：US20070116141A1

公开(公告)日：2007-05-24

申请号：US11594994

申请日：2006-11-09

申请人： Wenzhen Li ,  Zhongjun Wang ,  Yanxin Yan ,  Masayuki Tomisawa

发明人： Wenzhen Li ,  Zhongjun Wang ,  Yanxin Yan ,  Masayuki Tomisawa

IPC分类号： H04K1/10 ,  H03D1/00 ,  H04B1/10

CPC分类号： H04L25/03292 ,  H04B1/7163 ,  H04L25/03159 ,  H04L27/2647

摘要： A system for performing LS equalization on a signal in an OFDM system comprises a receiver stage for receiving a modulated signal, a demodulation stage for demodulating the received modulated signal to produce a demodulated signal, a channel estimation stage for processing the demodulated signal to provide an output signal corresponding to a channel frequency response and an equalization stage arranged to process the output signal from the channel estimation stage to produce a channel state information signal. The equalization stage is arranged to use the channel state information signal to operate on the demodulated signal from the demodulation stage to produce an equalized demodulated output signal. There is also disclosed a method for performing LS equalization on a signal in an OFDM system.

摘要翻译： 用于在OFDM系统中对信号执行LS均衡的系统包括用于接收调制信号的接收机级，用于解调所接收的调制信号以产生解调信号的解调级，用于处理解调信号以提供解调信号的信道估计级 对应于信道频率响应的输出信号和均衡级，被配置为处理来自信道估计级的输出信号以产生信道状态信息信号。 均衡级被设置为使用信道状态信息信号对来自解调级的解调信号进行操作，以产生均衡的解调输出信号。 还公开了一种在OFDM系统中对信号执行LS均衡的方法。

公开(公告)号：US08098749B2

公开(公告)日：2012-01-17

申请号：US12109100

申请日：2008-04-24

申请人： Zhongjun Wang ,  Masayuki Tomisawa

发明人： Zhongjun Wang ,  Masayuki Tomisawa

IPC分类号： H04K1/10 ,  H04L27/28

CPC分类号： H04L25/022 ,  H04L5/0007 ,  H04L5/0048 ,  H04L25/023 ,  H04L25/025 ,  H04L27/2647

摘要： A multi-stage CFR estimation method for multi-band OFDM-based UWB systems is provided. The method includes obtaining a CFR estimation ĥr(1) by performing LS estimation using a channel estimation sequence from a received OFDM-UWB frame; obtaining a CFR estimation ĥr(2) by applying a frequency-domain smoothing to the CFR estimation ĥr(1) with a first smoothing factor; obtaining a frame header which contains OFDM symbols transmitted with frequency-domain spreading on each OFDM symbol, and detecting signal signs based on a combination of two spread signals of the same OFDM symbol in the frame header with a decision directed mode and the CFR estimation ĥr(2) assisted; obtaining a CFR estimation ĥr(3) by using the signs and a finite-alphabet feature of the detected transmitted signals; obtaining a CFR estimation ĥr(4) by applying a frequency-domain smoothing to the CFR estimation ĥr(3) with a second smoothing factor; and obtaining a CFR estimation ĥr by averaging the CFR estimations ĥr(2) and ĥr(4).

摘要翻译： 提供了一种用于基于多频带OFDM的UWB系统的多级CFR估计方法。 该方法包括通过使用来自接收的OFDM-UWB帧的信道估计序列执行LS估计来获得CFR估计ĥr（1） 通过用第一平滑因子对CFR估计ĥr（1）应用频域平滑来获得CFR估计ĥr（2）; 获得包含在每个OFDM符号上以频域扩展发送的OFDM符号的帧标题，并且基于决策指导模式的帧头中的相同OFDM符号的两个扩展信号的组合和CFR估计ĥr来检测信号符号 （2）协助; 通过使用检测到的发送信号的符号和有限字母表特征来获得CFR估计ĥr（3）; 通过用第二平滑因子对CFR估计ĥr（3）应用频域平滑来获得CFR估计ĥr（4）; 并通过平均CFR估计ĥr（2）和ĥr（4）获得CFR估计。

公开(公告)号：US07843806B2

公开(公告)日：2010-11-30

申请号：US12116806

申请日：2008-05-07

申请人： Zhongjun Wang ,  Masayuki Tomisawa

发明人： Zhongjun Wang ,  Masayuki Tomisawa

IPC分类号： H04J11/00 ,  H04L27/00 ,  H04L25/00 ,  H04K1/10

CPC分类号： H04L27/266 ,  H04L27/2662 ,  H04L27/2675 ,  H04L27/2695

摘要： An apparatus for sampling clock recovery (SCO) and methods for estimating and compensating SCO are provided. The apparatus comprises a symbol timing adjustment module for shifting forward or backward symbol timing of the transmitted OFDM symbols; a discrete Fourier transform (DFT) processor for performing DFT to an output from the symbol timing adjustment module; a channel estimator for undertaking a channel frequency response estimation based on a channel estimation sequence; a SCO phase rotator for receiving and performing phase shift on the transmitted OFDM symbols of a frame header and a frame payload; an SCO estimation stage for undertaking an SCO estimation based on a pilot-subcarrier-related output of the SCO phase rotator and the CFR estimation; and an SCO compensation distributor for dividing the SCO estimation into integer and fractional portions and then distributing them into the symbol timing adjustment module and the SCO phase rotator, respectively.

摘要翻译： 提供了一种用于采样时钟恢复（SCO）的装置以及用于估计和补偿SCO的方法。 该装置包括用于移位所发送的OFDM符号的正向或反向符号定时的符号定时调整模块; 离散傅里叶变换（DFT）处理器，用于对符号定时调整模块的输出执行DFT; 信道估计器，用于基于信道估计序列进行信道频率响应估计; SCO相位旋转器，用于在帧头和帧有效载荷的发射OFDM符号上接收和执行相移; SCO估计级，用于基于SCO相位旋转器的导频子载波相关输出和CFR估计进行SCO估计; 以及SCO补偿分配器，用于将SCO估计分成整数和小数部分，然后将它们分配到符号定时调整模块和SCO相位旋转器中。

公开(公告)号：US07813494B2

公开(公告)日：2010-10-12

申请号：US11417511

申请日：2006-05-04

申请人： James R. Lichtenauer ,  Wayne Zhao ,  Zhongjun Wang ,  Ashok Bansal ,  Robert J. Schmitt ,  Richard Holman ,  James A. Williams ,  William W. Williams, legal representative

发明人： James R. Lichtenauer ,  Wayne Zhao ,  Zhongjun Wang ,  Ashok Bansal ,  Robert J. Schmitt ,  Richard Holman ,  James A. Williams

IPC分类号： H04M5/00

CPC分类号： H04L41/22 ,  H04L43/045 ,  H04L43/065 ,  H04L43/18

摘要： This disclosure provides a system and method for managing inventory of and space assignment in main distributing frames associated with a telephone network. The system includes a database that stores frame information and a server that uses the database and executes instructions contained in a computer program to maintain current inventory of the frames, including the equipment terminated on the frames and their allocated space. The server assigns the space for terminating new equipment on the frames and allocates the space to balance the load condition on the frames.

摘要翻译： 本公开提供了一种用于管理与电话网络相关联的主分配帧中的库存和空间分配的系统和方法。 该系统包括存储帧信息的数据库和使用数据库并执行包含在计算机程序中的指令的服务器，以维护帧的当前清单，包括终止在帧上的设备及其分配的空间。 服务器在帧上分配用于终止新设备的空间，并分配空间以平衡帧上的负载条件。

公开(公告)号：US20090279421A1

公开(公告)日：2009-11-12

申请号：US12116806

申请日：2008-05-07

申请人： Zhongjun Wang ,  Masayuki Tomisawa

发明人： Zhongjun Wang ,  Masayuki Tomisawa

IPC分类号： H04J11/00 ,  H04L27/28

CPC分类号： H04L27/266 ,  H04L27/2662 ,  H04L27/2675 ,  H04L27/2695

摘要： An apparatus for sampling clock recovery (SCO) and methods for estimating and compensating SCO are provided. The apparatus comprises a symbol timing adjustment module for shifting forward or backward symbol timing of the transmitted OFDM symbols; a discrete Fourier transform (DFT) processor for performing DFT to an output from the symbol timing adjustment module; a channel estimator for undertaking a channel frequency response estimation based on a channel estimation sequence; a SCO phase rotator for receiving and performing phase shift on the transmitted OFDM symbols of a frame header and a frame payload; an SCO estimation stage for undertaking an SCO estimation based on a pilot-subcarrier-related output of the SCO phase rotator and the CFR estimation; and an SCO compensation distributor for dividing the SCO estimation into integer and fractional portions and then distributing them into the symbol timing adjustment module and the SCO phase rotator, respectively.

摘要翻译： 提供了一种用于采样时钟恢复（SCO）的装置以及用于估计和补偿SCO的方法。 该装置包括用于移位所发送的OFDM符号的正向或反向符号定时的符号定时调整模块; 离散傅里叶变换（DFT）处理器，用于对符号定时调整模块的输出执行DFT; 信道估计器，用于基于信道估计序列进行信道频率响应估计; SCO相位旋转器，用于在帧头和帧有效载荷的发射OFDM符号上接收和执行相移; SCO估计级，用于基于SCO相位旋转器的导频子载波相关输出和CFR估计进行SCO估计; 以及SCO补偿分配器，用于将SCO估计分成整数和小数部分，然后将它们分配到符号定时调整模块和SCO相位旋转器中。