公开(公告)号：US06721366B1

公开(公告)日：2004-04-13

申请号：US09552029

申请日：2000-04-19

申请人： Nick Andrew Van Stralen

发明人： Nick Andrew Van Stralen

IPC分类号： H04L512

CPC分类号： H04L25/03273 ,  H04L27/2277 ,  H04L2027/0028 ,  H04L2027/004 ,  H04L2027/0055 ,  H04L2027/0067

摘要： A method establishes a phase reference signal for trellis demodulating CPM modulated received signals by using phase reference signals and symbol timing estimates. Branch metrics signals representing the highest-probability path through the trellis are calculated to produce beat estimates of the modulation data. The branch metrics signals are phase shifted to produce phase shifted branch metrics (PSBM) for each path. At each symbol interval, the highest probability PSEM (HPPSBM) signal for the path is selected. The selected phase shifted branch metric adjusts the value of the phase reference signals. Another method estimates the transmitted signal from at least the estimated data and the phase reference signal. The estimated transmitted signal is phase shifted to produce phase shifted estimated transmitted signals, which are correlated with the received data signals to produce phase error signals, which are smoothed and correct the phase reference signal.

摘要翻译： 一种方法通过使用相位参考信号和符号定时估计建立用于网格解调CPM调制接收信号的相位参考信号。 计算表示通过网格的最高概率路径的分支度量信号，以产生调制数据的节拍估计。 分支度量信号被相移以产生每个路径的相移分支度量（PSBM）。 在每个符号间隔，选择路径的最高概率PSEM（HPPSBM）信号。 所选择的相移分支度量调整相位参考信号的值。 另一种方法估计来自至少估计数据和相位参考信号的发射信号。 估计的发射信号被相移以产生相移的估计的发射信号，其与接收的数据信号相关，以产生相位误差信号，其被平滑并校正相位参考信号。

公开(公告)号：US20040057535A1

公开(公告)日：2004-03-25

申请号：US10251650

申请日：2002-09-20

申请人： ATI Technologies Inc.

发明人： Christopher H. Strolle ,  Samir N. Hulyalkar ,  Jeffrey S. Hamilton ,  Haosong Fu ,  Troy A. Schaffer

IPC分类号： H04L027/02 ,  H03D001/24 ,  H03D001/00 ,  H04L027/06

CPC分类号： H04H20/28 ,  H04H20/57 ,  H04L1/0045 ,  H04L1/0057 ,  H04L1/006 ,  H04L1/0065 ,  H04L1/007 ,  H04L1/0071 ,  H04L7/0004 ,  H04L7/0062 ,  H04L7/0278 ,  H04L25/0307 ,  H04L27/04 ,  H04L27/066 ,  H04L2025/03382 ,  H04L2025/03598 ,  H04L2027/004 ,  H04L2027/0055 ,  H04L2027/0081

摘要： A robust data extension added to a standard 8VSB digital television signal is used to improve the performance of a digital television receiver. The robust data extension is added to a standard 8VSB digital television transmission system by encoding high priority data packets in a rate null trellis encoder. The high priority data null trellis encoded packets are then multiplexed with normal data packets and input into the normal data service of an 8VSB system, which further contains a rate null trellis encoder. The combined trellis encoding results in a rate null trellis encoding for robust data packets and a rate null trellis encoding for normal packets. Backward compatibility with existing receivers is maintained for 1) 8VSB signaling, 2) trellis encoding and decoding, 3) Reed Solomon encoding and decoding, and 4) MPEG compatibility. In addition to delivery of robust data for mobile applications, the redundant robust data packets also improve the performance of the receiver in the normal tier of service. In particular, the robust data packets improve the performance of the receiver equalizer filter in the presence of rapidly changing transient channel conditions such as dynamic multipath for both robust data packets and normal data packets. The robust data packets improve the performance of the carrier recovery loop and the symbol timing recovery loop.

摘要翻译： 增加到标准8VSB数字电视信号的强大数据扩展被用于提高数字电视接收机的性能。 强大的数据扩展被添加到标准的8VSB数字电视传输系统中，通过以速率½格式编码器对高优先级的数据包进行编码。 然后将高优先级数据½网格编码数据包与正常数据包进行复用，并输入到8VSB系统的正常数据服务中，该数据服务还包含速率2/3网格编码器。 组合网格编码产生用于稳健数据分组的速率1/3网格编码以及针对普通分组的速率2/3网格编码。 维护与现有接收机的向后兼容性1）8VSB信令，2）网格编码和解码，3）里德所罗门编码和解码，以及4）MPEG兼容性。 除了为移动应用提供强大的数据外，冗余的鲁棒数据包还可以提高接收机在正常服务级别中的性能。 特别地，鲁棒数据分组在存在快速变化的瞬态信道条件（诸如鲁棒数据分组和正常数据分组的动态多径）的情况下，提高了接收机均衡器滤波器的性能。 鲁棒的数据包提高了载波恢复环路和符号定时恢复环路的性能。

公开(公告)号：US06614840B1

公开(公告)日：2003-09-02

申请号：US09525113

申请日：2000-03-14

申请人： Hidenori Maruyama

发明人： Hidenori Maruyama

IPC分类号： H03H730

CPC分类号： H04L27/0014 ,  H04L25/0228 ,  H04L2027/004 ,  H04L2027/0055

摘要： An equalizer with a phase-locked loop comprising: a phase rotator which rotates a phase of a received signal to output a rotated signal; an impulse response detector which detects impulse responses of a transmission line through which the received signal has been transmitted on the basis of the rotated signal; a first region designator which designates a first region on the basis of the impulse responses; a second region designator which designates a second region on the basis of the impulse responses; an equalizer which estimates a sequence on the basis of the rotated signal by using the impulse responses in the first region; a replica generator which generates a replica of the received signal on the basis of the sequence by using the impulse responses in the second region; a phase detector which detects a phase difference between the replica and the rotated signal; and a circuit for controlling the phase rotator on the basis of the phase difference to decrease the phase difference.

摘要翻译： 一种具有锁相环的均衡器，包括：相位旋转器，其使接收信号的相位旋转以输出旋转信号; 脉冲响应检测器，其基于所旋转的信号检测已经发送了接收信号的传输线的脉冲响应; 第一区域指示符，其基于脉冲响应指定第一区域; 第二区域指示符，其基于脉冲响应指定第二区域; 均衡器，其通过使用第一区域中的脉冲响应来估计基于旋转信号的序列; 复制产生器，其通过使用第二区域中的脉冲响应，基于该序列生成接收信号的副本; 相位检测器，其检测复制品和旋转信号之间的相位差; 以及基于相位差来控制相位旋转器的电路，以减小相位差。

公开(公告)号：US20030123582A1

公开(公告)日：2003-07-03

申请号：US10141628

申请日：2002-05-06

发明人： Younggyun Kim ,  Farshid R. Rad ,  Barrett J. Brickner ,  Jaekyun Moon

IPC分类号： H04L001/02

CPC分类号： H04B7/0848 ,  H04B7/0837 ,  H04L1/06 ,  H04L25/0204 ,  H04L25/03159 ,  H04L25/067 ,  H04L27/38 ,  H04L2025/03414 ,  H04L2025/0342 ,  H04L2025/03426 ,  H04L2027/003 ,  H04L2027/004 ,  H04L2027/0057

摘要： A wireless communication technique enables equalization, soft demapping and phase error estimation functions to be performed jointly based on multiple observations of a transmitted symbol in wireless communication systems employing receive diversity. Multiple observations of a symbol are obtained from multiple antenna paths in a wireless receiver. Equalization, soft demapping and phase error estimation functions can be integrated within shared hardware, rather than distributed among separate hardware blocks, promoting reduced size, complexity and cost in a wireless receiver.

摘要翻译： 无线通信技术使得能够基于采用接收分集的无线通信系统中的传输符号的多个观察来共同执行均衡，软解映射和相位误差估计功能。 从无线接收机中的多个天线路径获得符号的多个观察结果。 均衡，软解映射和相位误差估计功能可以集成在共享硬件中，而不是分布在不同的硬件块之间，从而在无线接收机中促进尺寸减小，复杂度和成本的降低。

公开(公告)号：US09584355B2

公开(公告)日：2017-02-28

申请号：US14233366

申请日：2013-03-25

申请人： Intel mobile Communications GmbH

发明人： Yunshuai Tang ,  Yanzeng Fu ,  Hong Zhang ,  Zhen Wang ,  Zhe Xu ,  Jie Lei

IPC分类号： H04L27/26 ,  H04B17/26 ,  H04L25/02 ,  H04L27/00

CPC分类号： H04L27/2675 ,  H04B17/26 ,  H04L25/022 ,  H04L27/0014 ,  H04L2027/0016 ,  H04L2027/003 ,  H04L2027/004 ,  H04L2027/0061

摘要： A device and method for estimating a frequency offset of a received signal is provided. The device comprises: a plurality of phase estimation units, each of the plurality of phase estimation units adapted for receiving one of a plurality of data parts of the received signal and estimating a phase caused by the frequency offset from the received data part, wherein the plurality of data parts comprises payload data and known symbols in the received signal. A method for estimating the frequency offset is also provided; and a frequency offset estimation unit for estimating the frequency offset from a plurality of phases estimated by the plurality of phase estimation units.

摘要翻译： 提供了一种用于估计接收信号的频率偏移的装置和方法。 所述装置包括：多个相位估计单元，所述多个相位估计单元中的每一个适于接收所述接收信号的多个数据部分中的一个，并且估计由所述接收数据部分引起的所述频率偏移的相位，其中， 多个数据部分包括接收信号中的有效载荷数据和已知符号。 还提供了估计频率偏移的方法; 以及频率偏移估计单元，用于估计由所述多个相位估计单元估计的多个相位的频率偏移。

公开(公告)号：US09419781B2

公开(公告)日：2016-08-16

申请号：US14563626

申请日：2014-12-08

申请人： Rambus Inc.

发明人： Hae-Chang Lee ,  Brian Leibowitz ,  Jaeha Kim ,  Jafar Savoj

IPC分类号： H04L7/00 ,  G06Q10/06 ,  G06Q10/10

CPC分类号： H04L7/0016 ,  G06Q10/06312 ,  G06Q10/103 ,  H04L7/0004 ,  H04L7/0062 ,  H04L7/033 ,  H04L7/0331 ,  H04L7/0334 ,  H04L25/062 ,  H04L2025/0349 ,  H04L2027/004 ,  H04L2027/0067 ,  H04L2027/0069

摘要： A receiver device implements enhanced data reception with edge-based clock and data recovery such as with a flash analog-to-digital converter architecture. In an example embodiment, the device implements a first phase adjustment control loop, with for example, a bang-bang phase detector, that detects data transitions for adjusting sampling at an optimal edge time with an edge sampler by adjusting a phase of an edge clock of the sampler. This loop may further adjust sampling in received data intervals for optimal data reception by adjusting the phase of a data clock of a data sampler such a flash ADC. The device may also implement a second phase adjustment control loop with, for example, a baud-rate phase detector, that detects data intervals for further adjusting sampling at an optimal data time with the data sampler.

公开(公告)号：US20130231071A1

公开(公告)日：2013-09-05

申请号：US13862756

申请日：2013-04-15

申请人： RESEARCH IN MOTION LIMITED

发明人： Onur CANPOLAT ,  Francis Chukwuemeka ONOCHIE

IPC分类号： H03J7/02

CPC分类号： H03J7/02 ,  H04L27/0014 ,  H04L2027/004 ,  H04L2027/0053 ,  H04L2027/0065 ,  H04L2027/0069 ,  H04L2027/0073

摘要： A method and apparatus for non-linear frequency control tracking of a control loop of a voltage controlled oscillator (VCO) in a wireless mobile device receiver is provided. A channel metric based on one or more channel quality indicators associated with a received radio frequency channel is determined and a state metric associated with the current operating state of the control loop are determined. One or more state metric threshold value associated with the determined channel metric, providing hysteresis between operating states, are determined wherein each state metric threshold value is associated with a transition to a possible operating state of the control loop. The control loop transitions from the current operating state to the operating state associated with an exceeded state metric threshold value. Coefficients are provided to an adaptive loop filter of the control loop, wherein the coefficients are associated with the transitioned operating state.

摘要翻译： 提供了一种用于无线移动设备接收机中的压控振荡器（VCO）的控制环路的非线性频率控制跟踪的方法和装置。 确定基于与接收的射频信道相关联的一个或多个信道质量指示符的信道度量，并且确定与控制环路的当前操作状态相关联的状态度量。 确定与确定的信道度量相关联的提供操作状态之间的迟滞的一个或多个状态度量阈值，其中每个状态度量阈值与向控制回路的可能运行状态的转变相关联。 控制环路从当前操作状态转换到与超出状态度量阈值相关联的操作状态。 将系数提供给控制回路的自适应环路滤波器，其中系数与转换的操作状态相关联。

公开(公告)号：US08509721B2

公开(公告)日：2013-08-13

申请号：US12614683

申请日：2009-11-09

申请人： Onur Canpolat ,  Francis Chukwuemeka Onochie

发明人： Onur Canpolat ,  Francis Chukwuemeka Onochie

IPC分类号： H04B1/06

CPC分类号： H03J7/02 ,  H04L27/0014 ,  H04L2027/004 ,  H04L2027/0053 ,  H04L2027/0065 ,  H04L2027/0069 ,  H04L2027/0073

摘要： A method and apparatus for non-linear frequency control tracking of a control loop of a voltage controlled oscillator (VCO) in a wireless mobile device receiver is provided. A channel metric based on one or more channel quality indicators associated with a received radio frequency channel is determined and a state metric associated with the current operating state of the control loop are determined. One or more state metric threshold value associated with the determined channel metric, providing hysteresis between operating states, are determined wherein each state metric threshold value is associated with a transition to a possible operating state of the control loop. The control loop transitions from the current operating state to the operating state associated with an exceeded state metric threshold value. Coefficients are provided to an adaptive loop filter of the control loop, wherein the coefficients coefficient are associated with the transitioned operating state.

摘要翻译： 提供了一种用于无线移动设备接收机中的压控振荡器（VCO）的控制环路的非线性频率控制跟踪的方法和装置。 确定基于与接收的射频信道相关联的一个或多个信道质量指示符的信道度量，并且确定与控制环路的当前操作状态相关联的状态度量。 确定与确定的信道度量相关联的提供操作状态之间的迟滞的一个或多个状态度量阈值，其中每个状态度量阈值与向控制回路的可能运行状态的转变相关联。 控制环路从当前操作状态转换到与超出状态度量阈值相关联的操作状态。 将系数提供给控制回路的自适应环路滤波器，其中系数系数与转换的操作状态相关联。

公开(公告)号：US07418061B2

公开(公告)日：2008-08-26

申请号：US11599334

申请日：2006-11-15

申请人： Thomas D. Kwon ,  Jonathan S. Min ,  Fang Lu ,  Thomas J. Kolze

发明人： Thomas D. Kwon ,  Jonathan S. Min ,  Fang Lu ,  Thomas J. Kolze

IPC分类号： H04L27/00 ,  H04L1/00

CPC分类号： H04L25/03273 ,  H04L25/03057 ,  H04L27/3827 ,  H04L2025/0349 ,  H04L2027/003 ,  H04L2027/004 ,  H04L2027/0055 ,  H04L2027/0061

摘要： A receiver includes a filter stage that receives, filters, and equalizes a received signal, and a decisional feedback loop coupled to the filter stage that receives and processes a signal output from the filter stage using remodulation. The decisional feedback loop includes a converter that generates a baseband signal, a detector that generates a decision signal, a restorative signal generator that generates a restorative signal using remodulation, and a carrier loop that generates a frequency correction signal and provides a frequency-offset estimate. The restorative signal and the frequency correction signal are provided to the converter to compensate for inter-symbol interference. The presented “remodulation” technique decouples interaction between the carrier loop, the pre-filters, and the equalizer of the restorative signal generator, providing an architecture that is more stable and significantly faster than conventional architectures.

摘要翻译： 接收机包括接收，滤波和均衡接收信号的滤波器级，以及耦合到滤波器级的判决反馈回路，其接收并处理从再过滤阶段输出的信号。 判决反馈回路包括产生基带信号的转换器，产生判定信号的检测器，使用再调制产生恢复信号的恢复信号发生器，以及产生频率校正信号并提供频偏估计的载波环路 。 将修复信号和频率校正信号提供给转换器以补偿符号间干扰。 所提出的“再调制”技术解耦了载体环路，预滤波器和恢复信号发生器的均衡器之间的相互作用，提供比传统架构更稳定和显着更快的架构。

公开(公告)号：US20080123786A1

公开(公告)日：2008-05-29

申请号：US11947105

申请日：2007-11-29

申请人： Supat Wongwirawat ,  Mark Hryszko ,  Devan Namboodiri ,  Raul A. Casas

发明人： Supat Wongwirawat ,  Mark Hryszko ,  Devan Namboodiri ,  Raul A. Casas

IPC分类号： H03D1/06 ,  H04B1/10 ,  H04L1/00 ,  H04L25/08

CPC分类号： H04L1/206 ,  H04L27/3809 ,  H04L27/3845 ,  H04L27/3872 ,  H04L2025/0349 ,  H04L2025/03687 ,  H04L2027/0026 ,  H04L2027/004 ,  H04L2027/0067

摘要： The present invention is directed to a method and system for detecting and compensating for signal impairments in modulated signals. Phase noise and gain noise based signal impairments can be detected as a function of the difference between the optimal position in the constellation grid (the center) and the actual position in the constellation grid of a received symbol. As symbols are received, they are compared to optimal positions and a measure of the phase noise and gain noise can be determined for each symbol. Over a period of time, the detector can compute an average measure of phase noise and gain noise. When the average measure of phase noise and/or gain noise reaches a predefined threshold, the detector can indicate a phase noise based and/or gain noise based signal impairment has been detected to the receiver. The receiver can adjust one or more receive parameters in order to improve reception. Burst noise based signal impairments can be detected as a function of the number of QAM symbols that have an i component or a q component that exceeds the maximum constellation value in a predefined period of time or in the course of a predefined number of symbols received. When the number of number of QAM symbols having burst noise exceeds reaches a predefined threshold, the detector can indicate a burst noise signal impairment to the receiver and the receiver can adjust one or more receive parameters in order to improve reception.