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    Adaptive equalizing system for digital communications
    1.
    发明授权
    Adaptive equalizing system for digital communications 失效
    数字通信自适应均衡系统

    公开(公告)号：US5506871A

    公开(公告)日：1996-04-09

    申请号：US253144

    申请日：1994-06-02

    申请人： Humor Hwang ,  Yang-seok Choi

    发明人： Humor Hwang ,  Yang-seok Choi

    IPC分类号： H04L25/02 ,  H04L25/03 ,  H03H7/30

    CPC分类号： H04L25/03038 ,  H04L2025/0363 ,  H04L2025/03694

    摘要： An adaptive equalizing system equalizes an unequalized signal and performs carrier recovery for use in a digital communication receiver. An equalizing coefficient is initialized by a constant modulus algorithm (CMA) and the initialized equalizing coefficient is more finely updated by a stop-and-go algorithm (SGA). When the convergency by the CMA reaches a predetermined threshold value, carrier recovery is performed, while when an average value of the phase error during performing the carrier recovery is less than another predetermined threshold value, the equalizing algorithm is converted into the SGA. Thus, the adaptive equalizing apparatus can equalize the received signal more simply and reliably.

    摘要翻译： 自适应均衡系统使未平衡的信号平衡，并执行载波恢复以用于数字通信接收机。 通过恒模算法（CMA）初始化均衡系数，并通过停止算法（SGA）更精细地更新初始化的均衡系数。 当CMA的收敛达到预定阈值时，执行载波恢复，而当执行载波恢复期间的相位误差的平均值小于另一预定阈值时，均衡算法被转换为SGA。 因此，自适应均衡装置可以更简单且可靠地均衡接收信号。

    Link performance abstraction for ML receivers based on RBIR metrics
    2.
    发明授权
    Link performance abstraction for ML receivers based on RBIR metrics 有权
    基于RBIR指标的ML接收机的链路性能抽象

    公开(公告)号：US08347152B2

    公开(公告)日：2013-01-01

    申请号：US12207497

    申请日：2008-09-10

    申请人： Hongming Zheng ,  Wu May ,  Yang-seok Choi ,  Senjie Zhang

    发明人： Hongming Zheng ,  Wu May ,  Yang-seok Choi ,  Senjie Zhang

    IPC分类号： G06F11/00

    CPC分类号： H04L1/06 ,  H04L1/0026 ,  H04L1/203 ,  H04L25/0204 ,  H04L25/0248

    摘要： A PHY abstraction mapping between the link level and system level performance is presented based on mapping between the mean RBIR (Received Bit Information Rate) of the transmitted symbols and their received LLR values after symbol-level ML detection in SISO/MIMO wireless systems, such as WiMAX. In MIMO antenna configuration, the mapping is presented for both vertical and horizontal encoding. An embodiment of this invention provides the PER/BLER prediction in the actual system, enabling the system to use more aggressive methods to improve the system performance.

    摘要翻译： 基于在SISO / MIMO无线系统中符号级ML检测之后的发送符号的平均RBIR（接收位信息速率）与其接收到的LLR值之间的映射，呈现链路级和系统级性能之间的PHY抽象映射， 作为WiMAX。 在MIMO天线配置中，呈现垂直和水平编码的映射。 本发明的实施例提供了实际系统中的PER / BLER预测，使得系统能够使用更积极的方法来改善系统性能。

    Link Performance Abstraction for ML Receivers based on RBIR Metrics
    4.
    发明申请
    Link Performance Abstraction for ML Receivers based on RBIR Metrics 有权
    基于RBIR指标的ML接收器的链路性能抽象

    公开(公告)号：US20100064185A1

    公开(公告)日：2010-03-11

    申请号：US12207497

    申请日：2008-09-10

    申请人： Hongming Zheng ,  Wu Mav ,  Yang-seok Choi ,  Senjie Zhang

    发明人： Hongming Zheng ,  Wu Mav ,  Yang-seok Choi ,  Senjie Zhang

    IPC分类号： G06F11/00

    CPC分类号： H04L1/06 ,  H04L1/0026 ,  H04L1/203 ,  H04L25/0204 ,  H04L25/0248

    摘要： A PHY abstraction mapping between the link level and system level performance is presented based on mapping between the mean RBIR (Received Bit Information Rate) of the transmitted symbols and their received LLR values after symbol-level ML detection in SISO/MIMO wireless systems, such as WiMAX. In MIMO antenna configuration, the mapping is presented for both vertical and horizontal encoding. An embodiment of this invention provides the PER/BLER prediction in the actual system, enabling the system to use more aggressive methods to improve the system performance.

    摘要翻译： 基于在SISO / MIMO无线系统中符号级ML检测之后的发送符号的平均RBIR（接收位信息速率）与其接收到的LLR值之间的映射，呈现链路级和系统级性能之间的PHY抽象映射， 作为WiMAX。 在MIMO天线配置中，呈现垂直和水平编码的映射。 本发明的实施例提供了实际系统中的PER / BLER预测，使得系统能够使用更积极的方法来改善系统性能。

    PREAMBLE TECHNIQUES FOR COMMUNICATIONS NETWORKS
    7.
    发明申请
    PREAMBLE TECHNIQUES FOR COMMUNICATIONS NETWORKS 有权
    通信网络的前瞻性技术

    公开(公告)号：US20090086832A1

    公开(公告)日：2009-04-02

    申请号：US11862331

    申请日：2007-09-27

    申请人： Vahid Tarokh ,  Shahrnaz Azizi ,  Yang-seok Choi

    发明人： Vahid Tarokh ,  Shahrnaz Azizi ,  Yang-seok Choi

    IPC分类号： H04L27/28

    CPC分类号： H04L27/2613

    摘要： Techniques are disclosed involving preamble sequences. For instance, an apparatus includes a module to provide a preamble sequence having multiple values, where each of the values corresponds to an orthogonal frequency division multiplexing (OFDM) subcarrier. These multiple values may include multiple blocks of values based on a differentially encoded and scrambled row of a Hadamard matrix. The apparatus may further include a modulation module to produce an OFDM modulated signal from the preamble sequence. Further, techniques for the detection of such preambles are disclosed.

    摘要翻译： 公开了涉及前序序列的技术。 例如，一种装置包括提供具有多个值的前同步码序列的模块，其中每个值对应于正交频分复用（OFDM）副载波。 这些多个值可以包括基于Hadamard矩阵的差分编码和加扰行的多个值块。 该装置还可以包括调制模块，用于从前导序列产生OFDM调制信号。 此外，公开了用于检测这种前导码的技术。

    Automatic frequency control method and apparatus therefor
    8.
    发明授权
    Automatic frequency control method and apparatus therefor 失效
    自动频率控制方法及装置

    公开(公告)号：US5566211A

    公开(公告)日：1996-10-15

    申请号：US411211

    申请日：1995-03-27

    申请人： Yang-seok Choi

    发明人： Yang-seok Choi

    IPC分类号： H03J7/00 ,  H04L27/00 ,  H04L27/22 ,  H04L27/227

    CPC分类号： H04L27/2273 ,  H04L2027/0028 ,  H04L2027/0057 ,  H04L2027/0067

    摘要： An automatic frequency control apparatus used in an MPSK communication system detects a frequency offset between a carrier and a local oscillation signal for adjustment of a local oscillation frequency. A phase difference detector generates a first phase difference detection signal having, as a phase value, a difference between the phases of various samples of the sampled signal. A phase altering unit generates a second phase difference detection signal having a phase value different from that of the first phase difference detection signal. A frequency offset signal generator estimates transmission phase information by using the phase value of the second phase difference detection signal and reference phase signals used for MPSK modulation, thereby generating a frequency offset signal which is determined by the transmission phase signal and the second phase difference detection signal. The result is that the number of the reference phases which are used for determination of the transmission phase information by altering the phase of the phase difference signal, is reduced. Accordingly, the hardware cost for implementing the apparatus can be lowered. The invention can be used for automatic frequency control in a modem which is used for all the types of MPSK modulation.

    摘要翻译： 在MPSK通信系统中使用的自动频率控制装置检测载波和本地振荡信号之间的频率偏移，以调整本地振荡频率。 相位差检测器产生第一相位差检测信号，该第一相位差检测信号具有采样信号的各种采样的相位之间的相位值。 相位改变单元产生具有与第一相位差检测信号不同的相位值的第二相位差检测信号。 频率偏移信号发生器通过使用第二相位差检测信号的相位值和用于MPSK调制的参考相位信号来估计发送相位信息，从而生成由发送相位信号和第二相位差检测确定的频率偏移信号 信号。 结果是通过改变相位差信号的相位而用于确定发送相位信息的参考相位的数量减少了。 因此，能够降低实施装置的硬件成本。 本发明可以用于所有类型的MPSK调制的调制解调器中的自动频率控制。

    METHOD AND SCHEME FOR SPACE-TIME CODED COCHANNEL INTERFERENCE CANCELLATION
    9.
    发明申请
    METHOD AND SCHEME FOR SPACE-TIME CODED COCHANNEL INTERFERENCE CANCELLATION 有权
    空间编码通道干扰消除的方法和方案

    公开(公告)号：US20090175366A1

    公开(公告)日：2009-07-09

    申请号：US12088496

    申请日：2005-09-30

    申请人： Alexander Maltsev ,  Alexey Khoryaev ,  Roman Maslennikov ,  Vladimir Pestretsov ,  Qinghua Li ,  Yang-seok Choi

    发明人： Alexander Maltsev ,  Alexey Khoryaev ,  Roman Maslennikov ,  Vladimir Pestretsov ,  Qinghua Li ,  Yang-seok Choi

    IPC分类号： H04B15/00 ,  H04L27/28

    CPC分类号： H04L1/0631 ,  H04B7/0634 ,  H04B7/0897 ,  H04L1/0059

    摘要： An apparatus, system, and method for space-time cochannel interference cancellation are described. The apparatus may include a time stacking module to stack consecutive subcarrier signals for a period of time equal to several symbols and a space-time subcarrier beamformer module to perform space-time subcarrier beamforming by applying space-time beamformer weights to stacked symbols on one or more subcarriers. The space-time beamformer weights may be calculated based on spatial and time correlation properties of one or more interference signals. Other embodiments are described and claimed.

    摘要翻译： 描述了用于时空同频干扰消除的装置，系统和方法。 该装置可以包括时间堆叠模块，用于堆叠等于几个符号的时间段的连续副载波信号，以及时空子载波波束形成器模块，以通过将时间波束形成器权重应用于一个或者多个符号上的堆叠符号来执行空时子载波波束形成 更多子载波 可以基于一个或多个干扰信号的空间和时间相关性来计算时空波束形成器权重。 描述和要求保护其他实施例。

    Decision directed algorithm control method
    10.
    发明授权
    Decision directed algorithm control method 失效
    决策指导算法控制方法

    公开(公告)号：US5537439A

    公开(公告)日：1996-07-16

    申请号：US253140

    申请日：1994-06-02

    申请人： Yang-seok Choi

    发明人： Yang-seok Choi

    IPC分类号： H03M13/00 ,  H04B7/005 ,  H04L1/00 ,  H04L25/03 ,  H04L27/01 ,  H03H7/30

    CPC分类号： H04L25/0305

    摘要： A method for adaptively turning on or off a decision directed algorithm (DDA) is performed according to the convergence state of the data to be equalized in a blind equalization system for use in a digital communication receiver. Each quadrant of a two-dimensional plane having an I-axis and Q-axis is divided into two decision areas. Then, a sign pair of actual error estimation data is calculated with respect to each area. If the decision error of the received symbol data is calculated, it is determined whether the sign of the decision error coincides with that of the actual error estimation data. The DDA is performed with respect to the symbol data of which the sign coincides with each other to update the equalization coefficient. The method further reduces the number of decision areas for dividing the plane formed by the I-axis and Q-axis in which the symbol data is arranged, to permit faster convergence speed and to further suppress the ratio of the symbol error.

    摘要翻译： 根据在数字通信接收机中使用的盲均衡系统中待均衡的数据的收敛状态来执行用于自适应地打开或关闭决策导向算法（DDA）的方法。 具有I轴和Q轴的二维平面的每个象限分为两个决定区域。 然后，针对每个区域计算实际的误差估计数据的符号对。 如果计算出接收到的符号数据的判定误差，则确定判定误差的符号是否与实际误差估计数据的符号一致。 相对于符号彼此重合的符号数据执行DDA以更新均衡系数。 该方法进一步减少了用于划分由其中排列有符号数据的I轴和Q轴形成的平面的判定区域的数量，以允许更快的收敛速度并进一步抑制符号误差的比率。