公开(公告)号：US20130039392A1

公开(公告)日：2013-02-14

申请号：US13207293

申请日：2011-08-10

申请人： Chih-Yuan Chu ,  Hao Zhou ,  Hao-Jen Cheng ,  Qinfang Sun

发明人： Chih-Yuan Chu ,  Hao Zhou ,  Hao-Jen Cheng ,  Qinfang Sun

IPC分类号： H04B1/709

CPC分类号： G01S19/246

摘要： A technique for reducing the dwell time in acquiring a satellite signal is provided. The technique minimizes the dwell time in searching for a satellite signal in cells of a search space by comparing the peak-power-to-average ratio (PAPR) to one or more thresholds at one or more intermediate points during the search in a code phase/Doppler frequency bin. The comparison is then used to determine whether to continue the search in a current code phase/Doppler frequency bin or to continue to the next code phase/Doppler frequency bin.

摘要翻译： 提供了一种用于减少获取卫星信号的驻留时间的技术。 该技术通过将峰值功率平均比（PAPR）与编码阶段的搜索期间的一个或多个中间点处的一个或多个阈值进行比较来最小化在搜索空间的单元中搜索卫星信号的停留时间 /多普勒频率仓。 然后比较用于确定是否在当前码相位/多普勒频率仓中继续搜索，或者继续到下一个码相位/多普勒频率仓。

公开(公告)号：US08340234B1

公开(公告)日：2012-12-25

申请号：US12496040

申请日：2009-07-01

申请人： Hao-ren Cheng ,  Chih-yuan Chu

发明人： Hao-ren Cheng ,  Chih-yuan Chu

IPC分类号： H03D1/06 ,  H03D11/04 ,  H03K5/01 ,  H03K6/04 ,  H04B1/10 ,  H04L1/00 ,  H04L25/08

CPC分类号： H04L25/0212 ,  H04L25/022 ,  H04L27/2665 ,  H04L27/2688 ,  H04L27/2695

摘要： This disclosure is directed to systems and methods for positioning a FFT window using the noise power that is related to ISI By selecting a FFT window position that minimizes the noise power, ISI is reduced or eliminated The techniques can be used in coherent and non-coherent systems Further, noise associated with the Doppler effect is compensated for, allowing the use of these system and methods in time-varying environments, such as mobile applications.

摘要翻译： 本公开涉及用于使用与ISI相关的噪声功率来定位FFT窗口的系统和方法。通过选择最小化噪声功率，减少或消除ISI的FFT窗口位置。该技术可用于相干和非相干 系统此外，补偿与多普勒效应相关的噪声，允许在诸如移动应用的时变环境中使用这些系统和方法。

公开(公告)号：US08855171B2

公开(公告)日：2014-10-07

申请号：US13207293

申请日：2011-08-10

申请人： Chih-Yuan Chu ,  Hao Zhou ,  Hao-Jen Cheng ,  Qinfang Sun

发明人： Chih-Yuan Chu ,  Hao Zhou ,  Hao-Jen Cheng ,  Qinfang Sun

IPC分类号： H04B1/00 ,  G01S19/24

CPC分类号： G01S19/246

摘要： A technique for reducing the dwell time in acquiring a satellite signal is provided. The technique minimizes the dwell time in searching for a satellite signal in cells of a search space by comparing the peak-power-to-average ratio (PAPR) to one or more thresholds at one or more intermediate points during the search in a code phase/Doppler frequency bin. The comparison is then used to determine whether to continue the search in a current code phase/Doppler frequency bin or to continue to the next code phase/Doppler frequency bin.

摘要翻译： 提供了一种用于减少获取卫星信号的驻留时间的技术。 该技术通过将峰值功率平均比（PAPR）与编码阶段的搜索期间的一个或多个中间点处的一个或多个阈值进行比较来最小化在搜索空间的单元中搜索卫星信号的停留时间 /多普勒频率仓。 然后比较用于确定是否在当前码相位/多普勒频率仓中继续搜索，或者继续到下一个码相位/多普勒频率仓。

公开(公告)号：US08335284B1

公开(公告)日：2012-12-18

申请号：US12398952

申请日：2009-03-05

申请人： Gaspar Lee ,  Hao-Ren Cheng ,  Chih-Yuan Chu ,  Kuang-Chung Ou

发明人： Gaspar Lee ,  Hao-Ren Cheng ,  Chih-Yuan Chu ,  Kuang-Chung Ou

IPC分类号： H03D1/04

CPC分类号： H04L25/0204 ,  H04L25/0232 ,  H04L25/0242

摘要： An apparatus and method in a multiple sub-carrier digital communication receiver for reducing inter-channel interference (ICI) includes a channel estimation block for calculating channel estimates, an interpolation block for calculating interpolated channel estimates, and an ICI reduction block for calculating ICI reduced receive symbols. Channel estimates are calculated based on receive symbols or ICI reduced receive symbols using pre-determined transmit symbols. Interpolated channel estimates are calculated by Wiener filter interpolation of a set of channel estimates. ICI estimates are calculated based on a set of interpolated channel estimates and either receive symbols or ICI reduced receive symbols. ICI reduced receive symbols are generated by subtracting ICI estimates from receive symbols.

摘要翻译： 用于减少信道间干扰（ICI）的多子载波数字通信接收机中的装置和方法包括：用于计算信道估计的信道估计块，用于计算内插信道估计的内插块和用于计算ICI减小的ICI减少块 接收符号。 基于使用预定发送符号的接收符号或ICI缩减的接收符号来计算信道估计。 通过一组信道估计的维纳滤波器插值来计算内插信道估计。 基于一组内插信道估计和接收符号或ICI缩减的接收符号来计算ICI估计。 通过从接收符号中减去ICI估计来产生ICI缩减的接收符号。

公开(公告)号：US08064507B1

公开(公告)日：2011-11-22

申请号：US12277258

申请日：2008-11-24

申请人： Hao-Ren Cheng ,  Gaspar Lee ,  Chih-Yuan Chu

发明人： Hao-Ren Cheng ,  Gaspar Lee ,  Chih-Yuan Chu

IPC分类号： H04B3/46 ,  H04B17/00 ,  H04Q1/20

CPC分类号： H04B7/01 ,  H04L25/0212 ,  H04L25/022 ,  H04L25/0232 ,  H04L25/03159

摘要： A method and apparatus in a multiple sub-carrier digital communication receiver that estimates a communication channel. A second set of channel estimates are generated based on a Wiener filter interpolation of a first set of channel estimates. Pre-determined transmit pilot symbols may be used to generate the first set of channel estimates in an OFDM communication system. The coefficients of the Wiener interpolation filter are based on a channel impulse response estimate that includes two or more narrow regions of non-zero amplitude separated by one or more wide regions of essentially zero amplitude. The Wiener interpolation filter coefficients are also based on a Doppler frequency estimate. The Doppler frequency estimate may be determined from the first set of channel estimates, while the Wiener interpolation filter coefficients may be generated from a pre-determined set of channel impulse responses.

摘要翻译： 估计通信信道的多子载波数字通信接收机中的方法和装置。 基于第一组信道估计的维纳滤波器内插生成第二组信道估计。 可以使用预定的发射导频符号来生成OFDM通信系统中的第一组信道估计。 维纳内插滤波器的系数基于信道脉冲响应估计，其包括由基本上零幅度的一个或多个宽区域分离的两个或更多个非零幅度的窄区域。 维纳内插滤波器系数也基于多普勒频率估计。 可以从第一组信道估计来确定多普勒频率估计，而可以从预定的信道脉冲响应集合生成维纳内插滤波器系数。

公开(公告)号：US08340221B1

公开(公告)日：2012-12-25

申请号：US12609294

申请日：2009-10-30

申请人： Hao-ren Cheng ,  Chih-yuan Chu ,  Justin Huang

发明人： Hao-ren Cheng ,  Chih-yuan Chu ,  Justin Huang

IPC分类号： H03K9/00

CPC分类号： H04L27/2659 ,  H04L27/2675 ,  H04L27/2695

摘要： Scattered pilots are used to estimate the integer frequency offset and OFDM symbol index simultaneously. A cross-correlation between IFFT outputs of received samples with different spectral shift and OFDM symbol index is used to identify the channel impulse response. Upon determination of the channel impulse, the estimated integer frequency offset and OFDM symbol index can then be determined.

摘要翻译： 散射导频用于同时估计整数频率偏移和OFDM符号索引。 使用具有不同频谱偏移和OFDM符号索引的接收样本的IFFT输出之间的互相关来识别信道脉冲响应。 在确定信道脉冲之后，可以确定估计的整数频率偏移和OFDM符号索引。

公开(公告)号：US08149905B1

公开(公告)日：2012-04-03

申请号：US12277247

申请日：2008-11-24

申请人： Hao-Ren Cheng ,  Gaspar Lee ,  Chih-Yuan Chu

发明人： Hao-Ren Cheng ,  Gaspar Lee ,  Chih-Yuan Chu

IPC分类号： H04B3/46 ,  H04B17/00 ,  H04Q1/20

CPC分类号： H04B7/01 ,  H04B3/46 ,  H04B17/309

摘要： A method and apparatus in a multiple sub-carrier digital communication receiver estimates a Doppler frequency bandwidth. The Doppler frequency bandwidth is estimated by comparing a first set of channel estimates to a second set of channel estimates generated by Wiener filter interpolation of the first set of channel estimates. The Wiener interpolation filter coefficients are generated for various Doppler frequency bandwidths. Pre-determined transmit pilot symbols may be used to generate the first set of channel estimates in an OFDM communication system. A set of Wiener filter interpolation errors may be generated at one or more sub-carrier frequencies, for each of the different Doppler frequency bandwidths, and averaged across time and/or frequency. The Doppler frequency estimation method and apparatus may select a Doppler frequency estimate based on the set of Wiener filter interpolation errors.

摘要翻译： 多子载波数字通信接收机中的方法和装置估计多普勒频带宽度。 通过将第一组信道估计与通过第一组信道估计的维纳滤波器内插生成的第二组信道估计进行比较来估计多普勒频带。 为各种多普勒频带宽度生成维纳内插滤波器系数。 可以使用预定的发射导频符号来生成OFDM通信系统中的第一组信道估计。 对于每个不同的多普勒频率带宽，可以在一个或多个子载波频率处产生一组维纳滤波器插值误差，并且在时间和/或频率上进行平均。 多普勒频率估计方法和装置可以基于维纳滤波器插值误差的集合来选择多普勒频率估计。