公开(公告)号：US07310368B2

公开(公告)日：2007-12-18

申请号：US10450887

申请日：2001-12-18

申请人： Xiaohu You ,  Jinghong Guo ,  Liangcheng Jiang ,  Chunming Zhao ,  Shixin Cheng

发明人： Xiaohu You ,  Jinghong Guo ,  Liangcheng Jiang ,  Chunming Zhao ,  Shixin Cheng

IPC分类号： H04B1/00 ,  H03D1/00

CPC分类号： H04B1/7075 ,  H04B1/7095 ,  H04B1/7113

摘要： The present invention discloses an apparatus for initial synchronization and cell search in a CDMA system based on multipath energy window. The apparatus perform initial synchronization and adjacent cell search by using multipath energy window based on the processing method of multipath energy window. The apparatus can be implemented based on a parallel correlator bank. This invention also provides the application of the apparatus to a coherent spreading receiver.

摘要翻译： 本发明公开了一种基于多径能量窗口的CDMA系统中初始同步和小区搜索的装置。 该装置基于多路径能量窗的处理方法，通过使用多径能量窗进行初始同步和相邻小区搜索。 该装置可以基于并行相关器组来实现。 本发明还提供了将该装置应用于相干扩展接收机。

公开(公告)号：US07366226B2

公开(公告)日：2008-04-29

申请号：US10450561

申请日：2001-12-12

申请人： Chunming Zhao ,  Jinghong Guo ,  Xiaohu You ,  Shixin Cheng

发明人： Chunming Zhao ,  Jinghong Guo ,  Xiaohu You ,  Shixin Cheng

IPC分类号： H04B1/00

CPC分类号： H04B1/70754 ,  H04B1/7085 ,  H04B1/7113 ,  H04B1/7117

摘要： The present invention discloses a method for pilot channel tracking based on multipath channel barycenter tracking loop, comprises steps of evaluating multipath fading channel parameters, calculating the barycenter of a multipath energy window, and loop filtering and adjusting the phase of spread spectrum sequence codes. The method of the invention does not need to individually track each delay path, thereby improving the tracking performance and timing recovery stability of a spread spectrum receiver. Only a multipath channel evaluator and a multipath energy window barycenter calculating means are used to track PN signals from a plurality of signal sources, thereby reducing hardware. Thus, a novelty coherent spread spectrum receiver can be constituted by cooperating with other parts.

摘要翻译： 本发明公开了一种基于多径信道重心跟踪环路的导频信道跟踪方法，包括多径衰落信道参数评估，多径能量窗口重心计算，循环滤波和调频扩频序列码相位的步骤。 本发明的方法不需要单独跟踪每个延迟路径，从而提高扩频接收机的跟踪性能和定时恢复稳定性。 仅使用多径信道评估器和多径能量窗重心计算装置来跟踪来自多个信号源的PN信号，由此减少硬件。 因此，可以通过与其他部分协作来构成新颖的相干扩频接收机。

公开(公告)号：US20050018641A1

公开(公告)日：2005-01-27

申请号：US10488387

申请日：2002-09-03

申请人： Chunming Zhao ,  Xhangyong Ma ,  Liangcheng Jiang ,  Xiaohu You

发明人： Chunming Zhao ,  Xhangyong Ma ,  Liangcheng Jiang ,  Xiaohu You

IPC分类号： H04B1/707 ,  H04B7/01 ,  H04L25/02 ,  H04B7/216

CPC分类号： H04B1/7117 ,  H04B1/712 ,  H04B7/01 ,  H04L25/0212

摘要： The present invention relates to a method and an apparatus for adjusting an average interval of channel estimation dynamically based on Doppler-shift. The method comprises the steps of estimating Doppler-shift by using level cross rate (LCR) according to differently moving speeds of mobile terminals, determining the optimal average interval of channel estimation based on the relationship between the existing Doppler-shift and the optimal average interval of channel estimation, dynamically adjusting the average interval of channel estimation according to the determined the optimal average interval of channel estimation to make the coherent receiver obtain the optimal estimation performance at different moving speeds. The apparatus of the present invention comprises a channel estimation module, a valid/strongest finger selection module, a RAKE demodulation and combining module, a RAKE output decision module, an LCR detection and Doppler-shift estimation module, a Gaussian noise power estimation module, a strongest path signal power estimation module, and an optimal average interval calculation module.

摘要翻译： 本发明涉及一种基于多普勒频移动态地调整信道估计的平均间隔的方法和装置。 该方法包括以下步骤：根据移动终端不同移动速度的等级交叉速率（LCR）估计多普勒频移，基于现有多普勒频移与最佳平均间隔之间的关系确定信道估计的最佳平均间隔 根据确定信道估计的最优平均间隔动态调整信道估计的平均间隔，使相干接收机在不同移动速度下获得最佳估计性能。 本发明的装置包括信道估计模块，有效/最强的手指选择模块，RAKE解调和组合模块，RAKE输出判定模块，LCR检测和多普勒频移估计模块，高斯噪声功率估计模块， 最强路径信号功率估计模块和最优平均间隔计算模块。

公开(公告)号：US07376176B2

公开(公告)日：2008-05-20

申请号：US10488387

申请日：2002-09-03

申请人： Chunming Zhao ,  Zhangyong Ma ,  Liangcheng Jiang ,  Xiaohu You

发明人： Chunming Zhao ,  Zhangyong Ma ,  Liangcheng Jiang ,  Xiaohu You

IPC分类号： H04B1/00 ,  H03D1/04

CPC分类号： H04B1/7117 ,  H04B1/712 ,  H04B7/01 ,  H04L25/0212

摘要： The present invention relates to a method and an apparatus for adjusting an average interval of channel estimation dynamically based on Doppler-shift. The method comprises the steps of estimating Doppler-shift by using level cross rate (LCR) according to differently moving speeds of mobile terminals, determining the optimal average interval of channel estimation based on the relationship between the existing Doppler-shift and the optimal average interval of channel estimation, dynamically adjusting the average interval of channel estimation according to the determined the optimal average interval of channel estimation to make the coherent receiver obtain the optimal estimation performance at different moving speeds. The apparatus of the present invention comprises a channel estimation module, a valid/strongest finger selection module, a RAKE demodulation and combining module, a RAKE output decision module, an LCR detection and Doppler-shift estimation module, a Gaussian noise power estimation module, a strongest path signal power estimation module, and an optimal average interval calculation module.

摘要翻译： 本发明涉及一种基于多普勒频移动态地调整信道估计的平均间隔的方法和装置。 该方法包括以下步骤：根据移动终端不同移动速度的等级交叉速率（LCR）估计多普勒频移，基于现有多普勒频移与最佳平均间隔之间的关系确定信道估计的最佳平均间隔 根据确定信道估计的最优平均间隔动态调整信道估计的平均间隔，使相干接收机在不同移动速度下获得最佳估计性能。 本发明的装置包括信道估计模块，有效/最强的手指选择模块，RAKE解调和组合模块，RAKE输出判定模块，LCR检测和多普勒频移估计模块，高斯噪声功率估计模块， 最强路径信号功率估计模块和最优平均间隔计算模块。

公开(公告)号：US20110299644A1

公开(公告)日：2011-12-08

申请号：US12796229

申请日：2010-06-08

申请人： Bing Xu ,  Chunming Zhao

发明人： Bing Xu ,  Chunming Zhao

IPC分类号： H03D3/24 ,  H03L7/00

CPC分类号： H04B1/0475 ,  H03L7/093 ,  H03L7/099 ,  H03L2207/06

摘要： A method may include synchronizing an output of a phase-locked loop to a signal received at its input. The method may further include suppressing emission at a potentially problematic channel by applying at least one of a first gain and a first resistance of the phase-locked loop for a communication at the potentially problematic channel, wherein at least one of the first gain and the first resistance are different from a second gain and a second resistance applied for communications at channels other than potentially problematic channels.

摘要翻译： 一种方法可以包括将锁相环路的输出与在其输入处接收到的信号同步。 该方法还可以包括通过对可能有问题的信道进行通信应用锁相环的第一增益和第一电阻中的至少一个来抑制潜在有问题的信道上的发射，其中，第一增益和 第一电阻不同于第二增益和第二电阻，其应用于除了潜在有问题的通道之外的通道的通信。

公开(公告)号：US08406113B2

公开(公告)日：2013-03-26

申请号：US12253635

申请日：2008-10-17

申请人： Chunming Zhao ,  Ning Chen

发明人： Chunming Zhao ,  Ning Chen

IPC分类号： H04J5/04

CPC分类号： H04L27/2623 ,  H04J11/0026 ,  H04L27/2636

摘要： A wireless transmitter exhibits improved power de-rating reduction, which improves the power efficiency of non-constant envelop communication systems by mapping N first samples of a first discrete Fourier transform (DFT) of a group of coded symbols to M sub-carriers according to a first sub-carrier mapping rule (212), performing a first inverse DFT (IDFT) on the M sub-carriers to provide M second samples (214), clipping the M second samples according to a clipping rule to provide M third samples (216), performing a second DFT on the M third samples (218), and applying a frequency domain mask to generate M clipped samples (220) which may be mapped to O subcarriers according to a predetermined second subcarrier mapping rule. The transmitter may be advantageously implemented within a single carrier transmission scheme, such as a single carrier-frequency division multiple access (SC-FDMA) uplink transmission scheme.

摘要翻译： 一种无线发射机具有改善的降低功率的功率，其通过将编码符号组的第一离散傅立叶变换（DFT）的N个第一样本映射到M个子载波来提高非恒定包络通信系统的功率效率，根据 第一子载波映射规则（212），对M个子载波执行第一反向DFT（IDFT）以提供M个第二采样（214），根据限幅规则对M个第二采样进行削波以提供M个第三采样 216），对M个第三采样（218）执行第二DFT，并且施加频域掩码以根据预定的第二子载波映射规则生成可以被映射到O个子载波的M个限幅采样（220）。 发射机可以有利地在诸如单载波频分多址（SC-FDMA）上行链路传输方案的单载波传输方案中实现。

公开(公告)号：US20100113105A1

公开(公告)日：2010-05-06

申请号：US12262943

申请日：2008-10-31

申请人： Bing Xu ,  Mahibur Rahman ,  Chunming Zhao

发明人： Bing Xu ,  Mahibur Rahman ,  Chunming Zhao

IPC分类号： H04B1/38 ,  H01Q11/12 ,  H04B1/16

CPC分类号： H04W52/08 ,  H04L27/0012 ,  H04W52/10 ,  H04W52/262 ,  H04W52/52

摘要： Embodiments include methods and apparatus for performing transmit power control. A gain application element receives a sequence of digital input samples and a digital gain signal, and combines the digital gain signal with the digital input samples to generate a sequence of gain-compensated digital samples. A power amplifier receives and amplifies an analog version of the gain-compensated digital samples in order to generate an antenna output signal. A feedback path generates an analog feedback signal from the antenna output signal, produces a sequence of digital feedback samples from the analog feedback signal, and generates difference values based on the digital feedback samples. When a specified type of constant modulus symbol is represented in the antenna output symbol, the feedback path accumulates the difference values into an accumulated error value, and produces the digital gain signal from the accumulated error value.

摘要翻译： 实施例包括用于执行发射功率控制的方法和装置。 增益应用元件接收数字输入采样序列和数字增益信号，并将数字增益信号与数字输入采样相结合，以生成增益补偿数字采样序列。 功率放大器接收并放大增益补偿数字采样的模拟版本，以产生天线输出信号。 反馈路径从天线输出信号产生模拟反馈信号，从模拟反馈信号产生一系列数字反馈采样，并根据数字反馈采样产生差值。 当在天线输出符号中表示指定类型的常数符号符号时，反馈路径将差值累积为累积误差值，并从积累的误差值产生数字增益信号。

公开(公告)号：US20100097923A1

公开(公告)日：2010-04-22

申请号：US12253635

申请日：2008-10-17

申请人： Chunming Zhao ,  Ning Chen

发明人： Chunming Zhao ,  Ning Chen

IPC分类号： H04J11/00 ,  H04L25/49

CPC分类号： H04L27/2623 ,  H04J11/0026 ,  H04L27/2636

摘要： A wireless transmitter exhibits improved power de-rating reduction, which improves the power efficiency of non-constant envelop communication systems by mapping N first samples of a first discrete Fourier transform (DFT) of a group of coded symbols to M sub-carriers according to a first sub-carrier mapping rule (212), performing a first inverse DFT (IDFT) on the M sub-carriers to provide M second samples (214), clipping the M second samples according to a clipping rule to provide M third samples (216), performing a second DFT on the M third samples (218), and applying a frequency domain mask to generate M clipped samples (220) which may be mapped to O subcarriers according to a predetermined second subcarrier mapping rule. The transmitter may be advantageously implemented within a single carrier transmission scheme, such as a single carrier-frequency division multiple access (SC-FDMA) uplink transmission scheme.

摘要翻译： 一种无线发射机具有改善的降低功率的功率，其通过将编码符号组的第一离散傅立叶变换（DFT）的N个第一样本映射到M个子载波来提高非恒定包络通信系统的功率效率，根据 第一子载波映射规则（212），对M个子载波执行第一反向DFT（IDFT）以提供M个第二采样（214），根据限幅规则对M个第二采样进行削波以提供M个第三采样 216），对M个第三采样（218）执行第二DFT，并且施加频域掩码以根据预定的第二子载波映射规则生成可以被映射到O个子载波的M个限幅采样（220）。 发射机可以有利地在诸如单载波频分多址（SC-FDMA）上行链路传输方案的单载波传输方案中实现。

公开(公告)号：US08543364B2

公开(公告)日：2013-09-24

申请号：US12561830

申请日：2009-09-17

申请人： Song Liu ,  Lixin Tian ,  Xian-Huan Wen ,  Chunming Zhao ,  Qinghong Yang ,  Peng Zhang ,  Dengen Zhou ,  Bo Li ,  Lichuan Lan ,  Lizhen Ge ,  Xinwu Liao ,  Fengli Zhang ,  Michael Sheng-Wei Wei

发明人： Song Liu ,  Lixin Tian ,  Xian-Huan Wen ,  Chunming Zhao ,  Qinghong Yang ,  Peng Zhang ,  Dengen Zhou ,  Bo Li ,  Lichuan Lan ,  Lizhen Ge ,  Xinwu Liao ,  Fengli Zhang ,  Michael Sheng-Wei Wei

IPC分类号： G06G7/48

CPC分类号： E21B43/00

摘要： Computer-implemented systems and methods are provided for optimizing hydrocarbon recovery from subsurface formations, including subsurface formations having bottom water or edgewater. A system and method can be configured to receive data indicative of by-pass oil areas in the subsurface formation from reservoir simulation, identify flow barriers in the subsurface formation based on the by-pass oil areas identified by the reservoir simulation, and predict the lateral extension of the identified flow barriers in the subsurface formation. Infill horizontal wells can be placed at areas of the subsurface formation relative to the flow barriers such that production from a horizontal well in the subsurface formation optimizes hydrocarbon recovery.

摘要翻译： 提供计算机实现的系统和方法，用于优化地下构造的烃回收，包括具有底部水或污水的地下地层。 一种系统和方法可以被配置为接收指示来自储层模拟的地下地层旁路油区的数据，基于由油藏模拟识别的旁路油区，识别地下地层中的流动障碍，并预测横向 在地下构造中识别的流动障碍的扩展。 填充水平井可以放置在相对于流动屏障的地下地层的区域，使得地下地层中的水平井的生产优化了烃回收。

公开(公告)号：US07944991B2

公开(公告)日：2011-05-17

申请号：US11588009

申请日：2006-12-11

申请人： Chunming Zhao ,  Robert J. Baxley ,  Guotong Zhou

发明人： Chunming Zhao ,  Robert J. Baxley ,  Guotong Zhou

IPC分类号： H04K1/02

CPC分类号： H04L27/2623

摘要： Disclosed is a constrained clipping technique for reducing the peak-to-average power ratio (PAR) or crest factor of a multicarrier communications signal. This is a transmitter-side processing technique that does not impose any modification at the receiver. Constrained clipping achieves PAR reduction while simultaneously satisfying spectral mask and error vector magnitude (EVM) constraints that are specified by most modern communications standards. The constrained clipping technique includes two independent processing units, one to satisfy an in-band EVM constraint and the other to satisfy an out-of-band spectral constraint. Achievable PAR reduction results vary depending on a particular standard's requirements, but by using constrained clipping on a QPSK WiMax signal with 256 subcarriers, for example, a 4.5 dB PAR reduction at the 10−2 complementary cumulative distribution function (CCDF) level can be obtained.

摘要翻译： 公开了一种用于降低多载波通信信号的峰值平均功率比（PAR）或峰值因数的约束限幅技术。 这是一种发射机侧处理技术，不会在接收机上强加任何修改。 约束剪辑实现PAR减少，同时满足大多数现代通信标准规定的频谱掩模和误差向量幅度（EVM）约束。 约束剪辑技术包括两个独立的处理单元，一个用于满足带内EVM约束，另一个满足带外频谱约束。 可实现的PAR减少结果根据特定标准的要求而变化，但是通过在具有256个子载波的QPSK WiMax信号上使用受限制的限幅，例如，可以获得在10-2互补累积分布函数（CCDF）级别的4.5dB的PAR减小 。