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    TIMING ADJUSTMENTS FOR CHANNEL ESTIMATION IN A MULTI CARRIER SYSTEM
    11.
    发明申请
    TIMING ADJUSTMENTS FOR CHANNEL ESTIMATION IN A MULTI CARRIER SYSTEM 有权
    多载波系统中信道估计的时序调整

    公开(公告)号：US20080219144A1

    公开(公告)日：2008-09-11

    申请号：US11777251

    申请日：2007-07-12

    Applicant: Matthias Brehler ,  Joseph Chan

    Inventor： Matthias Brehler ,  Joseph Chan

    IPC: H04J11/00

    CPC classification number: H04L27/2695 ,  H04L5/0007 ,  H04L5/0048 ,  H04L27/2665

    Abstract: Apparatus and methods are provided for making timing adjustments in a multi carrier communications system. In an aspect, a timing correction method is provided for a multi-carrier system. This includes adjusting the time basis of two or more pilot interlaces with respect to each other in order to account for timing differences between the interlaces when combining the interlaces, and then adjusting or matching the time bases of the combined interlaces with a symbol to be demodulated. The alignment and matching is performed in order to generate channel estimates for data demodulation. The channel estimates, thus generated, along with the timing alignment information are in turn used for determining timing corrections to be applied to demodulation of a particular symbol. Corresponding apparatus are also disclosed that implement the methodology.

    Abstract translation: 提供了用于在多载波通信系统中进行时序调整的装置和方法。 在一方面，为多载波系统提供定时校正方法。 这包括相对于彼此调整两个或多个导频交织的时间基准，以便在组合交织时考虑交织之间的定时差，然后将组合交织的时基与要解调的符号进行调整或匹配 。 执行对准和匹配以便产生用于数据解调的信道估计。 由此产生的信道估计与定时对准信息一起用于确定要应用于特定符号的解调的定时校正。 还公开了实现该方法的相应装置。

    CHANNEL ESTIMATION FOR MULTI-CARRIER COMMUNICATION
    12.
    发明申请
    CHANNEL ESTIMATION FOR MULTI-CARRIER COMMUNICATION 失效
    多载波通信的信道估计

    公开(公告)号：US20080084817A1

    公开(公告)日：2008-04-10

    申请号：US11548050

    申请日：2006-10-10

    Applicant: James Edward Beckman ,  Joseph Chan ,  Farrokh Abrishamkar ,  Matthias Brehler ,  Michael Leviant

    Inventor： James Edward Beckman ,  Joseph Chan ,  Farrokh Abrishamkar ,  Matthias Brehler ,  Michael Leviant

    IPC: H04J11/00

    CPC classification number: H04L25/023 ,  H04L5/0048 ,  H04L25/0244 ,  H04L25/025

    Abstract: Techniques for deriving a channel estimate using a scattered pilot and a continual pilot are described. The scattered pilot is sent on different sets of carriers in different symbol periods. The continual pilot is sent in each symbol period on irregularly spaced carriers. The scattered pilot is used to identify the indices of channel taps of interest, e.g., L strongest channel taps. The continual pilot is used to determine the complex gains of these L channel taps. A receiver derives a channel impulse response estimate based on received pilot symbols for the scattered pilot, identifies the L strongest channel taps, and determines the indices of these L strongest channel taps. The receiver forms a Fourier sub-matrix based on the L tap indices and determines the gains of the L channel taps based on received pilot symbols for the continual pilot and the Fourier sub-matrix.

    Abstract translation: 描述了使用分散导频和连续导频来导出信道估计的技术。 分散导频在不同符号周期的不同载波集上发送。 连续飞行员在每个符号周期内发送不规则的航空母舰。 分散导频用于识别所关心的信道抽头的索引，例如L个最强的信道抽头。 连续导频用于确定这些L信道分接头的复杂增益。 接收机基于接收到的导频符号导出用于散射导频的信道脉冲响应估计，识别L个最强信道抽头，并且确定这些L个最强信道抽头的索引。 接收器基于L抽头索引形成傅里叶子矩阵，并且基于用于连续导频和傅里叶子矩阵的接收导频符号确定L个信道抽头的增益。

    Methods and systems for time tracking in OFDM systems
    15.
    发明授权
    Methods and systems for time tracking in OFDM systems 失效
    OFDM系统中时间跟踪的方法和系统

    公开(公告)号：US08311159B2

    公开(公告)日：2012-11-13

    申请号：US12351797

    申请日：2009-01-09

    Applicant: Junqiang Li ,  Matthias Brehler ,  Je Woo Kim

    Inventor： Junqiang Li ,  Matthias Brehler ,  Je Woo Kim

    IPC: H04L27/06

    CPC classification number: H04L27/2662 ,  H04L27/2665

    Abstract: Techniques proposed in the present disclosure may used to update an FFT window position and perform linear phase compensation for OFDM wireless systems with up to two antennas at the receiver. Techniques presented herein may help resolve a problem of determining an optimum FFT window position under the condition that the length of channel impulse response is larger than the length of cyclic prefix.

    Abstract translation: 在本公开中提出的技术可以用于更新FFT窗口位置并且在接收机处对具有多达两个天线的OFDM无线系统执行线性相位补偿。 本文提出的技术可以帮助解决在信道脉冲响应的长度大于循环前缀的长度的条件下确定最佳FFT窗口位置的问题。

    Signaling bit detection with adaptive threshold
    16.
    发明授权
    Signaling bit detection with adaptive threshold 有权
    具有自适应阈值的信令位检测

    公开(公告)号：US08290441B2

    公开(公告)日：2012-10-16

    申请号：US11019141

    申请日：2004-12-20

    Applicant: Nagabhushan Kurapati ,  Matthias Brehler

    Inventor： Nagabhushan Kurapati ,  Matthias Brehler

    IPC: H04B17/00

    CPC classification number: H04L25/0212 ,  H04L25/0224 ,  H04W68/00

    Abstract: For signaling detection using an adaptive threshold, the channel condition observed by a signaling bit (e.g., a paging indicator bit) is estimated (e.g., by a pilot strength estimate). A metric for the signaling bit is computed based on recovered symbols for the signaling bit and the estimated channel condition. An adaptive threshold is selected based on the estimated channel condition. A decision is derived for the signaling bit based on the metric, the adaptive threshold, and the estimated channel condition. Multiple threshold values may be derived for the adaptive threshold for multiple ranges of estimated channel condition, one threshold value for each range. A look-up table stores the threshold values and provides the proper adaptive threshold value for any given estimated channel condition.

    Abstract translation: 对于使用自适应阈值的信令检测，估计信令位（例如，寻呼指示符位）观察到的信道状况（例如，通过导频强度估计）。 基于用于信令位的恢复符号和估计的信道条件来计算信令位的度量。 基于估计的信道条件来选择自适应阈值。 基于度量，自适应阈值和估计的信道条件，导出用于信令比特的决定。 可以针对估计的信道条件的多个范围的自适应阈值导出多个阈值，每个范围的一个阈值。 查找表存储阈值，并为任何给定的估计信道条件提供适当的自适应阈值。

    ID-cell index search algorithm and carrier frequency offset estimation
    17.
    发明授权
    ID-cell index search algorithm and carrier frequency offset estimation 失效
    ID-cell索引搜索算法和载波频率偏移估计

    公开(公告)号：US08243775B2

    公开(公告)日：2012-08-14

    申请号：US12337641

    申请日：2008-12-18

    Applicant: Junqiang Li ,  Je Woo Kim ,  Jong Hyeon Park ,  Matthias Brehler

    Inventor： Junqiang Li ,  Je Woo Kim ,  Jong Hyeon Park ,  Matthias Brehler

    IPC: H04L1/7083

    CPC classification number: H04L27/2659 ,  H04J11/0073 ,  H04L27/2675 ,  H04L27/2684

    Abstract: Techniques for initial wireless network synchronization by a mobile station are provided. For certain embodiments, the techniques may involve a joint search for the cell identification (ID-cell index) and the coarse carrier frequency offset (CFO) estimation. For certain embodiments, the techniques may be based on hard correlation and binary differential despreading that substantially simplifies computational complexity compare to known techniques that independently search for the ID-cell index and perform CFO estimation.

    Abstract translation: 提供了由移动台进行初始无线网络同步的技术。 对于某些实施例，这些技术可以涉及对小区标识（ID-小区索引）和粗略载波频率偏移（CFO）估计的联合搜索。 对于某些实施例，该技术可以基于硬相关和二进制差分解扩，其与独立地搜索ID小区索引并执行CFO估计的已知技术相比基本上简化了计算复杂度。

    METHODS AND APPARATUS FOR INITIAL ACQUISITION IN A COMMUNICATION SYSTEM
    18.
    发明申请
    METHODS AND APPARATUS FOR INITIAL ACQUISITION IN A COMMUNICATION SYSTEM 有权
    在通信系统中初始采集的方法和装置

    公开(公告)号：US20100322117A1

    公开(公告)日：2010-12-23

    申请号：US12796009

    申请日：2010-06-08

    Applicant: Remi J. Gurski ,  Raghu N. Challa ,  Matthias Brehler

    Inventor： Remi J. Gurski ,  Raghu N. Challa ,  Matthias Brehler

    IPC: H04J3/00

    CPC classification number: H03G3/3078 ,  H03G3/3042 ,  H03G3/3052 ,  H04B1/70735 ,  H04B1/708

    Abstract: Disclosed are methods and apparatus for initial acquisition in a communication system, and in particular Time Division Duplex (TDD) systems such as those found in LTE. A disclosed method, for example, includes running a plurality of predetermined amplifier gain states for a low noise amplifier (LNA) during initial acquisition in a time division duplex (TDD) system, and determining acquisition of a received signal based on searching across the plurality of predetermined amplifier gain states. Forcing the amplifier gain into a set of predetermined gain states affords quicker resolution of initial acquisition for setting the gain of the LNA, which in TDD systems is complicated due to an uncertain uplink/downlink timeline that precludes continuous operation of a gain setting algorithm run in the LNA.

    Abstract translation: 公开了用于在通信系统中的初始采集的方法和装置，特别是诸如在LTE中发现的时分双工（TDD）系统。 所公开的方法例如包括在时分双工（TDD）系统中的初始采集期间运行用于低噪声放大器（LNA）的多个预定的放大器增益状态，以及基于跨越多个的搜索来确定接收信号的获取 的预定放大器增益状态。 将放大器增益强制为一组预定增益状态可以提供更快的初始采集分辨率，用于设置LNA的增益，由于不确定的上行链路/下行链路时间轴，TDD系统复杂，导致增加设置算法持续运行， LNA。

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