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    Method and apparatus for efficient selection and acquisition of systems utilizing OFDM or SC-FDM
    22.
    发明授权
    Method and apparatus for efficient selection and acquisition of systems utilizing OFDM or SC-FDM 有权
    用于有效选择和采集OFDM或SC-FDM的系统的方法和装置

    公开(公告)号：US08331286B2

    公开(公告)日：2012-12-11

    申请号：US12181116

    申请日：2008-07-28

    申请人： Rotem Cooper ,  Aamod Khandekar ,  Michael Mao Wang ,  Karthik Anantharaman

    发明人： Rotem Cooper ,  Aamod Khandekar ,  Michael Mao Wang ,  Karthik Anantharaman

    IPC分类号： H04W72/02

    CPC分类号： H04L27/0012 ,  H04L5/0007 ,  H04L5/0053 ,  H04L27/0008 ,  H04L27/2613 ,  H04L27/2647

    摘要： Techniques for performing system selection and acquisition are described. In one design, a terminal may obtain at least one system record for at least one system utilizing orthogonal frequency division multiplexing (OFDM) or single-carrier frequency division multiplexing (SC-FDM). Each system record may include system identification information for an associated system and an index for an associated acquisition record. The terminal may also obtain at least one acquisition record for the at least one system. Each acquisition record may include at least one value for at least one configurable system parameter, e.g., FFT size, cyclic prefix length, number of guard subcarriers, etc. The terminal may perform acquisition for the at least one system in accordance with the at least one system record and the at least one acquisition record. The system and acquisition records may be stored in a Preferred Roaming List (PRL) or a Most Recently Used (MRU) list.

    摘要翻译： 描述了执行系统选择和采集的技术。 在一种设计中，终端可以为利用正交频分复用（OFDM）或单载波频分复用（SC-FDM）的至少一个系统获得至少一个系统记录。 每个系统记录可以包括关联系统的系统识别信息和关联采集记录的索引。 终端还可以获得至少一个系统的至少一个采集记录。 每个采集记录可以包括用于至少一个可配置系统参数的至少一个值，例如FFT大小，循环前缀长度，保护子载波数量等。终端可以至少根据至少一个系统执行对至少一个系统的采集 一个系统记录和至少一个采集记录。 系统和采集记录可以存储在首选漫游列表（PRL）或最近使用（MRU）列表中。

    TIMING AND FREQUENCY ACQUISITION FOR WIRELESS NETWORKS
    23.
    发明申请
    TIMING AND FREQUENCY ACQUISITION FOR WIRELESS NETWORKS 审中-公开
    无线网络的时序和频率采集

    公开(公告)号：US20120263167A1

    公开(公告)日：2012-10-18

    申请号：US13531489

    申请日：2012-06-22

    申请人： Michael Mao Wang

    发明人： Michael Mao Wang

    IPC分类号： H04W56/00 ,  H04L27/06 ,  H04J3/06

    CPC分类号： H04L27/2662 ,  H04L5/0007 ,  H04L27/2657 ,  H04L27/2675 ,  H04W56/00

    摘要： Systems and methods are provided for processing Time Domain Multiplexing Pilot symbols by employing complex accumulators to determine peak values which indicate the start of timing and frequency information. In an embodiment, a method is provided for timing acquisition in a wireless network. The method includes acquiring samples from an Orthogonal Frequency Division Multiplexing (OFDM) data packet over a predetermined period of time, where the samples include one or more TDM pilot symbols. The samples are then processed to determine a maximum value that indicates the TDM pilot symbol has been detected.

    摘要翻译： 提供了系统和方法，用于通过采用复合累加器来确定指示定时和频率信息开始的峰值来处理时域多路复用导频符号。 在一个实施例中，提供了一种用于无线网络中的定时获取的方法。 该方法包括在预定时间段内从正交频分复用（OFDM）数据分组获取样本，其中样本包括一个或多个TDM导频符号。 然后处理样本以确定指示已经检测到TDM导频符号的最大值。

    Time tracking for a communication system
    25.
    发明授权
    Time tracking for a communication system 有权
    通讯系统的时间跟踪

    公开(公告)号：US08165167B2

    公开(公告)日：2012-04-24

    申请号：US11371536

    申请日：2006-03-08

    申请人： Bojan Vrcelj ,  Ashok Mantravadi ,  Fuyun Ling ,  Rajiv Vijayan ,  Michael Mao Wang

    发明人： Bojan Vrcelj ,  Ashok Mantravadi ,  Fuyun Ling ,  Rajiv Vijayan ,  Michael Mao Wang

    IPC分类号： H04J11/00 ,  H04L7/00

    CPC分类号： H04L27/2662 ,  H04L5/0007 ,  H04L5/0048 ,  H04L25/0216 ,  H04L25/022 ,  H04L25/0228 ,  H04L27/261 ,  H04L27/265 ,  H04L27/2665 ,  H04L27/2679

    摘要： A method for characterizing a communication channel is disclosed. A detection window is moved through a channel profile to accumulate tap energies in the channel profile within the detection window into an accumulated energy curve. A peak at a maximum in the accumulated energy curve is determined. A band relative to the accumulated energy curve is defined. A first arriving path (FAP) is determined using a trailing edge found near a second end of a zone in the accumulated energy curve. A leading edge is found near a first end of the zone of the accumulated energy curve. The last arriving path (LAP) is determined using the leading edge. The band defines a zone of the accumulated energy curve at or near the maximum that is within the band.

    摘要翻译： 公开了一种用于表征通信信道的方法。 检测窗口通过通道轮廓移动，以将检测窗口内的通道轮廓中的抽头能量累积为累积的能量曲线。 确定累积能量曲线中最大值的峰值。 定义相对于累积能量曲线的带。 使用在累积能量曲线中的区域的第二端附近发现的后沿来确定第一到达路径（FAP）。 在累积能量曲线的区域的第一端附近发现前沿。 最后到达路径（LAP）使用前沿确定。 频带定义在频带内或附近的最大值处的累积能量曲线的区域。

    WIDE AREA AND LOCAL NETWORK ID TRANSMISSION FOR COMMUNICATION SYSTEMS
    26.
    发明申请
    WIDE AREA AND LOCAL NETWORK ID TRANSMISSION FOR COMMUNICATION SYSTEMS 有权
    用于通信系统的宽带和本地网络标识传输

    公开(公告)号：US20110058469A1

    公开(公告)日：2011-03-10

    申请号：US12948759

    申请日：2010-11-18

    申请人： Michael Mao Wang ,  Bojan Vrcelj ,  Krishna Kiran Mukkavilli ,  Raghuraman Krishnamoorthi ,  Rajiv Vijayan

    发明人： Michael Mao Wang ,  Bojan Vrcelj ,  Krishna Kiran Mukkavilli ,  Raghuraman Krishnamoorthi ,  Rajiv Vijayan

    IPC分类号： H04J11/00 ,  H04L27/28

    CPC分类号： H04L5/0048 ,  H04L5/0007 ,  H04L5/0083 ,  H04L27/261

    摘要： The embodiments utilize OFDM symbols to communicate network IDs. The IDs are encoded into symbols utilizing the network IDs as seeds to scramble respective pilots that are then transmitted by utilizing the symbols. The pilots can be structured into a single OFDM symbol and/or multiple OFDM symbols. The single symbol structure for transmitting the network IDs is independent of the number of network ID bits and minimizes frequency offset and Doppler effects. The multiple symbol structure allows a much coarser timing accuracy to be employed at the expense of transmitting additional symbols. Several embodiments employ a search function to find possible network ID candidates from a transmitted symbol and a selection function to find an optimum candidate from a network ID candidate list.

    摘要翻译： 这些实施例利用OFDM符号来传送网络ID。 ID被编码成使用网络ID作为种子的符号，以对通过利用符号进行发送的各个导频进行加扰。 导频可以被构造成单个OFDM符号和/或多个OFDM符号。 用于发送网络ID的单个符号结构与网络ID比特数无关，并且使频偏和多普勒效应最小化。 多符号结构允许以牺牲传输附加符号为代价采用更粗糙的定时精度。 几个实施例采用搜索功能来从发送的符号和选择功能中找到可能的网络ID候选，以从网络ID候选列表中找到最佳候选。

    GAIN CONTROL METRIC PRUNING IN A WIRELESS REPEATER
    27.
    发明申请
    GAIN CONTROL METRIC PRUNING IN A WIRELESS REPEATER 有权
    在无线重发器中增益控制公制

    公开(公告)号：US20100285742A1

    公开(公告)日：2010-11-11

    申请号：US12722760

    申请日：2010-03-12

    申请人： Michael Mao Wang ,  Gwendolyn Denise Barriac ,  Dhananjay Ashok Gore

    发明人： Michael Mao Wang ,  Gwendolyn Denise Barriac ,  Dhananjay Ashok Gore

    IPC分类号： H04B7/14

    CPC分类号： H04B7/15578

    摘要： A method for controlling gain in a wireless repeater includes computing a gain control metric indicative of a loop gain of the repeater and detecting changes in a signal power of a gain control input signal where the gain control input signal is taken from any point in the feedback loop of the repeater. When a large power swing in the gain control input signal is detected, the method operates to discard at least a portion of each gain control metric measurement for a first duration before continuing with computing the gain control metric. In another embodiment, the method may include discarding samples of the gain control input signal used in computing the gain control metric for a first duration when a large power swing in the gain control input signal is detected.

    摘要翻译： 一种用于控制无线中继器中的增益的方法包括：计算表示中继器的环路增益的增益控制度量，并且检测增益控制输入信号的信号功率的变化，其中增益控制输入信号是从反馈中的任何点 中继器的回路。 当检测到增益控制输入信号中的大功率摆幅时，该方法在继续计算增益控制度量之前，在第一持续时间内丢弃每个增益控制度量测量的至少一部分。 在另一实施例中，当检测到增益控制输入信号中的大功率摆幅时，该方法可以包括丢弃用于计算增益控制度量的增益控制输入信号的采样，该第一持续时间。

    WIDEBAND ECHO CANCELLATION IN A REPEATER
    29.
    发明申请
    WIDEBAND ECHO CANCELLATION IN A REPEATER 失效
    一个重复的宽带ECHO取消

    公开(公告)号：US20100285733A1

    公开(公告)日：2010-11-11

    申请号：US12609505

    申请日：2009-10-30

    申请人： Dhananjay Ashok Gore ,  Gwendolyn Denise Barriac ,  James Arthur Proctor, JR. ,  Steven J. Howard ,  Hakan Inanoglu ,  Kenneth M. Gainey ,  Michael Mao Wang ,  Tao Tian

    发明人： Dhananjay Ashok Gore ,  Gwendolyn Denise Barriac ,  James Arthur Proctor, JR. ,  Steven J. Howard ,  Hakan Inanoglu ,  Kenneth M. Gainey ,  Michael Mao Wang ,  Tao Tian

    IPC分类号： H04B7/14

    CPC分类号： H04B7/15535 ,  H04B7/15585 ,  H04L27/2607 ,  H04L27/2613

    摘要： A wireless repeater having a receiving antenna for receiving an input signal and a transmitting antenna for transmitting an amplified signal includes first and second front-end circuits and a repeater baseband block coupled between the first and second front-end circuits. The repeater baseband block includes a channel estimation block, an echo canceller implementing time domain echo cancellation, a variable gain stage controlled by a gain control block implementing digital gain control, a first variable delay element introducing a first delay before or after the echo canceller, a second variable delay element introducing a second delay to the output signal. The delayed output signal is coupled to the channel estimation block as a reference signal for estimating the feedback channel, to the echo canceller as a reference signal for estimating the feedback signal, and to the gain control block for monitoring the stability of the repeater.

    摘要翻译： 具有用于接收输入信号的接收天线和用于发送放大信号的发射天线的无线中继器包括耦合在第一和第二前端电路之间的第一和第二前端电路和中继器基带块。 中继器基带块包括信道估计块，实现时域回声消除的回波消除器，实现数字增益控制的增益控制块控制的可变增益级，在回波消除器之前或之后引入第一延迟的第一可变延迟元件， 向输出信号引入第二延迟的第二可变延迟元件。 延迟输出信号作为用于估计反馈信道的参考信号，作为用于估计反馈信号的参考信号的回波消除器和用于监视中继器的稳定性的增益控制块耦合到信道估计块。