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：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：US07203894B2

公开(公告)日：2007-04-10

申请号：US10847285

申请日：2004-05-18

申请人： Ju Yan Pan ,  Chang Qing Xu ,  Masayuki Tomisawa

发明人： Ju Yan Pan ,  Chang Qing Xu ,  Masayuki Tomisawa

IPC分类号： H03M13/41

CPC分类号： H04L1/0054 ,  H03M13/01

摘要： A method of estimating the reliability of decoded message bits in a digital communications system is proposed. Message and tail bits are coded and transmitted across a communications channel. The coded message and tail bits are then decoded and it is determined that the decoded message bits have no error when the decoded tail bits have at least one error.

摘要翻译： 提出了一种在数字通信系统中估计解码消息比特的可靠性的方法。 消息和尾比特被编码并通过通信信道传输。 然后对编码消息和尾比特进行解码，并且当解码的尾比特具有至少一个错误时，确定解码的消息比特没有错误。

公开(公告)号：US20070024477A1

公开(公告)日：2007-02-01

申请号：US11481663

申请日：2006-07-06

申请人： Changqing Xu ,  Zhiping Li ,  Tingwu Wang ,  Masayuki Tomisawa

发明人： Changqing Xu ,  Zhiping Li ,  Tingwu Wang ,  Masayuki Tomisawa

IPC分类号： H03M3/00

CPC分类号： H04L27/2331 ,  H04L27/2338

摘要： There is provided a method and apparatus for demodulating a received hard limited DPSK signal, which may be an intermediate frequency (IF) signal. The apparatus comprises: a digital down converter for generating an in-phase component I and a quadrature component Q of a received signal; at least one decimator for reducing sampling frequency of the received signal; at least one filter for reducing noise outside a required bandwidth; and a differential decoder for performing differential detection of I and Q over a given symbol span. The method comprises the steps of: generating an in-phase component I and a quadrature component Q from a received signal; reducing sampling frequency of the received signal; reducing noise outside a required bandwidth; and performing differential detection of I and Q over a given symbol span.

摘要翻译： 提供了一种用于解调接收的硬限制DPSK信号的方法和装置，其可以是中频（IF）信号。 该装置包括：数字下变频器，用于产生接收信号的同相分量I和正交分量Q; 至少一个抽取器，用于降低接收信号的采样频率; 至少一个用于减少所需带宽外的噪声的滤波器; 以及用于在给定符号跨度上执行I和Q的差分检测的差分解码器。 该方法包括以下步骤：从接收信号产生同相分量I和正交分量Q; 降低接收信号的采样频率; 降低所需带宽外的噪声; 并在给定的符号跨度上执行I和Q的差分检测。

公开(公告)号：US20050259768A1

公开(公告)日：2005-11-24

申请号：US11130318

申请日：2005-05-16

申请人： Chunhua Yang ,  Theng Yeo ,  Masayuki Tomisawa

发明人： Chunhua Yang ,  Theng Yeo ,  Masayuki Tomisawa

IPC分类号： H04L27/00 ,  H04L27/08 ,  H04L27/20

CPC分类号： H04L27/2017 ,  H04L27/0008 ,  H04L27/2075

摘要： A digital receiver for a burst-mode wireless communication system, such as a Bluetooth system comprises a radio frequency input stage for receiving an input signal and an analogue-to-digital converter for converting the input signal from an analogue signal to a digital signal. A switch is coupled to the analogue-to-digital converter and a first signal processor is coupled to the switch and is arranged to demodulate signals modulated according to a first modulation process, such as a GFSK modulation process. A second signal processor is also coupled to the switch and is arranged to demodulate signals modulated according to a second modulation process, such as π/4DQPSK modulation process or an 8DPSK modulation process. The switch is arranged to switch the digital signal between the first and second signal processors to recover signals from the first and/or the second modulation process. A method for processing received signals in a burst-mode wireless communication system is also disclosed.

摘要翻译： 用于诸如蓝牙系统的突发模式无线通信系统的数字接收机包括用于接收输入信号的射频输入级和用于将模拟信号的输入信号转换为数字信号的模拟 - 数字转换器。 开关耦合到模数转换器，并且第一信号处理器耦合到开关，并被布置成对根据第一调制过程调制的信号进行解调，例如GFSK调制过程。 第二信号处理器还耦合到开关，并且被布置为对根据第二调制过程调制的信号进行解调，诸如pi / 4DQPSK调制处理或8DPSK调制处理。 开关被设置为在第一和第二信号处理器之间切换数字信号，以从第一和/或第二调制过程恢复信号。 还公开了一种在突发模式无线通信系统中处理接收信号的方法。

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：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：US20050278605A1

公开(公告)日：2005-12-15

申请号：US11132862

申请日：2005-05-19

申请人： Chang Xu ,  Masayuki Tomisawa

发明人： Chang Xu ,  Masayuki Tomisawa

IPC分类号： G06F7/00 ,  G06F7/08 ,  G06F7/24 ,  G06F7/36 ,  G06F15/00 ,  H03M13/00 ,  H03M13/23 ,  H03M13/29 ,  H03M13/41 ,  H03M13/45

CPC分类号： H03M13/3905 ,  H03M13/23 ,  H03M13/2957 ,  H03M13/41 ,  H03M13/6516

摘要： An encoder system for encoding a signal according to any number of FEC and/or channel codes comprises a shift register, an array of MOD/XOR stages, and a generator matrix stage for controlling the connections between the shift register and the MOD/XOR stages and altering these connections according to a coding format selected by an encoder selection stage. There is also disclosed a decoder system for decoding a signal encoded according to a number of FEC and/or channel codes comprising a decoding stage, and a generator matrix stage for configuring the decoding stage to a decoding code format to be applied an incoming encoded signal. A decoder selection stage is coupled to the generator matrix stage and selects the decoding code format to be used in the decoding process. The decoder selection stage instructs the generator matrix stage to configure the decoding stage according to the selected decoding code format. There is also disclosed a method for encoding and decoding.

摘要翻译： 用于根据任何数量的FEC和/或信道码编码信号的编码器系统包括移位寄存器，MOD / XOR级的阵列和用于控制移位寄存器和MOD / XOR级之间的连接的发生器矩阵级 以及根据由编码器选择级选择的编码格式来改变这些连接。 还公开了一种解码器系统，用于对根据包含解码级的FEC和/或信道码的数量编码的信号进行解码，以及生成矩阵级，用于将解码级配置为应用输入编码信号的解码码格式 。 解码器选择级耦合到发生器矩阵级，并选择要在解码过程中使用的解码码格式。 解码器选择阶段指示发生器矩阵级根据选择的解码码格式配置解码级。 还公开了一种编码和解码方法。