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    Checkpoint based progressive backup
    2.
    发明授权
    Checkpoint based progressive backup 有权
    基于检查点的逐行备份

    公开(公告)号：US08543544B2

    公开(公告)日：2013-09-24

    申请号：US13345584

    申请日：2012-01-06

    Applicant: Frank Lu ,  James Qiu ,  Jonathan Thatcher ,  Murali Vemulapati ,  Carl Wang ,  Terrence Barwegen

    Inventor： Frank Lu ,  James Qiu ,  Jonathan Thatcher ,  Murali Vemulapati ,  Carl Wang ,  Terrence Barwegen

    IPC: G06F7/00 ,  G06F17/00

    CPC classification number: G06F17/30353 ,  G06F11/1446 ,  G06F2201/84

    Abstract: Methods, program products, and systems for checkpoint based progressive backup are described. When a system receives a request to update a page of a storage device storing database files of a database, the system can update the page and replicate the updated page in a shadow page in a backup queue. The backup queue can store multiple shadow pages, where each updated page can correspond to at most a specified number of shadow pages in the queue. Each shadow page can be associated with a timestamp of a latest update. At pre-specified temporal checkpoints, the system can write the shadow pages in the queue to a backup file in the order of the timestamps. Upon receiving a restoration request, the system can restore the database to a state as of the time of the checkpoint using the backup file.

    Abstract translation: 描述了基于检查点的渐进式备份的方法，程序产品和系统。 当系统接收到更新存储数据库数据库文件的存储设备的页面的请求时，系统可以更新页面并在备份队列中的影子页面中复制更新的页面。 备份队列可以存储多个影子页面，其中每个更新的页面可以对应于队列中最多指定数量的影子页面。 每个影子页可以与最新更新的时间戳相关联。 在预先指定的时间检查点，系统可以按照时间戳的顺序将队列中的影子页面写入备份文件。 在收到恢复请求后，系统可以使用备份文件将数据库恢复到检查点时间的状态。

    Low-complexity diversity using preequalization
    3.
    发明授权
    Low-complexity diversity using preequalization 有权
    低复杂度多样性使用预授权

    公开(公告)号：US08472912B2

    公开(公告)日：2013-06-25

    申请号：US12966905

    申请日：2010-12-13

    Applicant: Sridhar Ramesh ,  James Qiu ,  Sugbong Kang

    Inventor： Sridhar Ramesh ,  James Qiu ,  Sugbong Kang

    IPC: H04B1/16

    CPC classification number: H04B7/0845 ,  H04B1/16 ,  H04B7/0857 ,  H04B7/0885 ,  H04B7/12 ,  H04L5/0023 ,  H04L5/0048 ,  H04L25/0204 ,  H04L25/03159 ,  H04L25/14 ,  H04L27/2649 ,  H04L2025/03414 ,  H04L2025/03426

    Abstract: A diversity receiver includes a first RF front end module for receiving a first RF signal, and frequency converting the first RF signal and outputting a first diversity signal, a second RF front end module for receiving a second RF signal, frequency converting the second RF signal and outputting a second diversity signal, a first converter for converting the first diversity signal to a first time-domain signal, a second converter for converting the second diversity signal to a second time-domain signal, a first transformer for translating the first time-domain signal to a first frequency-domain signal, a second transformer for translating the second time-domain signal to a second frequency-domain signal, a first pre-equalizer for equalizing the first frequency-domain signal, a second pre-equalizer for equalizing the second frequency-domain signal, and a combiner for combining the first and second pre-equalized frequency-domain signals. The diversity receiver further includes a channel estimator having a mirror window.

    Abstract translation: 分集接收机包括用于接收第一RF信号的第一RF前端模块和对第一RF信号进行频率转换并输出第一分集信号，用于接收第二RF信号的第二RF前端模块，对第二RF信号进行频率转换 并输出第二分集信号，将第一分集信号转换为第一时域信号的第一转换器，将第二分集信号转换为第二时域信号的第二转换器， 域信号转换为第一频域信号;第二变压器，用于将第二时域信号转换为第二频域信号;第一预均衡器，用于均衡第一频域信号;第二预均衡器，用于均衡 第二频域信号，以及用于组合第一和第二预均衡的频域信号的组合器。 分集接收机还包括具有镜像窗口的信道估计器。

    Channel estimation in a pilot assisted OFDM system
    4.
    发明授权
    Channel estimation in a pilot assisted OFDM system 有权
    导频辅助OFDM系统中的信道估计

    公开(公告)号：US08995589B1

    公开(公告)日：2015-03-31

    申请号：US13291968

    申请日：2011-11-08

    Applicant: James Qiu

    Inventor： James Qiu

    IPC: H03K9/00 ,  H04L27/06 ,  H04B1/10 ,  H03L7/099

    CPC classification number: H03L7/099 ,  H04L25/0218 ,  H04L25/022 ,  H04L25/0232

    Abstract: An accurate channel frequency response is obtained by processing an extracted number of pilot tones provided at different locations within a received OFDM symbol. This includes filtering the extracted pilot tones with a first window function, converting the thus filtered pilot tones to a first channel impulse response signal that may include a main tap and a plurality of adjacent taps, removing taps whose absolute values or energy levels are below a predetermined level, processing the remaining taps having sufficient absolute values or energy levels into a second channel impulse response signal that is significantly free of noises, converting the second channel impulse response signal to a frequency-domain signal, and filtering the frequency-domain signal with a second window function having an inverse characteristic of that of the first window function to obtain an accurate channel frequency response.

    Abstract translation: 通过处理在接收的OFDM符号内的不同位置提供的提取的导频音调数来获得准确的信道频率响应。 这包括用第一窗口功能对所提取的导频音进行滤波，将由此滤波的导频音转换为可包括主抽头和多个相邻抽头的第一信道脉冲响应信号，去除绝对值或能级低于 将具有足够的绝对值或能量级的剩余抽头处理成明显无噪声的第二信道脉冲响应信号，将第二信道脉冲响应信号转换成频域信号，并且用 第二窗函数具有第一窗函数的反特性以获得准确的信道频率响应。

    PERFORMANCE BOTTLENECK DETECTION IN SCALABILITY TESTING
    5.
    发明申请
    PERFORMANCE BOTTLENECK DETECTION IN SCALABILITY TESTING 审中-公开
    性能测试在性能测试中的性能检测

    公开(公告)号：US20130179144A1

    公开(公告)日：2013-07-11

    申请号：US13345613

    申请日：2012-01-06

    Applicant: Frank Lu ,  James Qiu ,  John Li

    Inventor： Frank Lu ,  James Qiu ,  John Li

    IPC: G06F9/44

    CPC classification number: G06F11/3433 ,  G06F11/3409 ,  G06F11/3414 ,  G06F11/3442 ,  G06F2201/81

    Abstract: A testing system can perform scalability testing on a target system, including automatically identifying a performance bottleneck component of the target system when the target system includes multiple components. The testing system can specify a target load of a specified component of the target system. The testing system can provide a simulated request to the target system and measure performance of the target system. Based on the measurement, the testing system can determine a scaling factor. The testing system can scale up the simulated request by the scaling factor, and determine whether one or more components of the target system have reached full capacity. The testing system can then adjust the scaling factor and the simulated request, until the testing system identifies a component of the target system that is a performance bottleneck of the target system when a specific number of requests are provided.

    Abstract translation: 测试系统可以对目标系统执行可扩展性测试，包括当目标系统包含多个组件时自动识别目标系统的性能瓶颈组件。 测试系统可以指定目标系统的指定组件的目标负载。 测试系统可以向目标系统提供模拟请求，并测量目标系统的性能。 基于测量，测试系统可以确定缩放因子。 测试系统可以通过缩放因子来扩展模拟请求，并且确定目标系统的一个或多个组件是否已经达到满容量。 然后，测试系统可以调整缩放因子和模拟请求，直到当提供特定数量的请求时，测试系统识别作为目标系统的性能瓶颈的目标系统的组件。

    Channel sensitive power control
    6.
    发明授权
    Channel sensitive power control 有权
    通道敏感功率控制

    公开(公告)号：US08442154B2

    公开(公告)日：2013-05-14

    申请号：US12799378

    申请日：2010-04-23

    Applicant: James Qiu ,  Sridhar Ramesh ,  Sheng Ye ,  Curtis Ling

    Inventor： James Qiu ,  Sridhar Ramesh ,  Sheng Ye ,  Curtis Ling

    IPC: H03K9/00

    CPC classification number: H04W52/0245 ,  H03G3/20 ,  H04B1/109 ,  H04B17/00 ,  H04L1/20 ,  H04L27/06 ,  H04W88/02 ,  Y02D70/00 ,  Y02D70/40

    Abstract: A communication receiver which applies signal processing for quantitatively estimating receive signal factors such as communication channel quality, signal characteristics, and overall system received bit error rate (BER) or packet error rate (PER) and which applies a general algorithm for mapping these estimated factors to control receiver performance and minimize power consumption.

    Abstract translation: 一种通信接收机，其应用信号处理，用于定量估计诸如通信信道质量，信号特征和总体系统接收误比特率（BER）或分组差错率（PER）的接收信号因子，并且其应用用于映射这些估计因子的通用算法 以控制接收机性能并降低功耗。

    Self-Calibrating Gain Control System
    7.
    发明申请
    Self-Calibrating Gain Control System 有权
    自校准增益控制系统

    公开(公告)号：US20120299650A1

    公开(公告)日：2012-11-29

    申请号：US13568865

    申请日：2012-08-07

    Applicant: James Qiu ,  Sridhar Ramesh

    Inventor： James Qiu ,  Sridhar Ramesh

    IPC: H03G3/20

    CPC classification number: H03G3/20 ,  H03G3/3052

    Abstract: A circuit for self-calibrating a gain control system samples the output of a digital amplifier coupled in series with one or more analog amplifiers to correct errors in a discrete stepped gain control. A digital gain control circuit controls both the digital amplifier and at least one analog amplifier to produce a smooth linear and continuous gain, wherein perturbations in the digital control of gain are smoothed by a signal applied to gain control circuit by a gain step correction circuit.

    Abstract translation: 用于自校准增益控制系统的电路对与一个或多个模拟放大器串联耦合的数字放大器的输出进行采样，以校正离散步进增益控制中的误差。 数字增益控制电路控制数字放大器和至少一个模拟放大器，以产生平滑的线性和连续增益，其中增益数字控制中的扰动被通过增益阶梯校正电路施加到增益控制电路的信号平滑。

    Self-calibrating gain control system
    9.
    发明申请
    Self-calibrating gain control system 有权
    自校准增益控制系统

    公开(公告)号：US20100277240A1

    公开(公告)日：2010-11-04

    申请号：US12799870

    申请日：2010-05-04

    Applicant: James Qiu ,  Sridhar Ramesh

    Inventor： James Qiu ,  Sridhar Ramesh

    IPC: H03G3/00

    CPC classification number: H03G3/20 ,  H03G3/3052

    Abstract: A circuit for self-calibrating a gain control system samples the output of a digital amplifier coupled in series with one or more analog amplifiers to correct errors in a discrete stepped gain control. A digital gain control circuit controls both the digital amplifier and at least one analog amplifier to produce a smooth linear and continuous gain, wherein perturbations in the digital control of gain are smoothed by a signal applied to gain control circuit by a gain step correction circuit.

    Abstract translation: 用于自校准增益控制系统的电路对与一个或多个模拟放大器串联耦合的数字放大器的输出进行采样，以校正离散步进增益控制中的误差。 数字增益控制电路控制数字放大器和至少一个模拟放大器，以产生平滑的线性和连续增益，其中增益数字控制中的扰动被通过增益阶梯校正电路施加到增益控制电路的信号平滑。

    Filtering a Distributed Join
    10.
    发明申请
    Filtering a Distributed Join 审中-公开
    过滤分布式联接

    公开(公告)号：US20130262433A1

    公开(公告)日：2013-10-03

    申请号：US13437464

    申请日：2012-04-02

    Applicant: James Qiu ,  Murali Vemulapati

    Inventor： James Qiu ,  Murali Vemulapati

    IPC: G06F17/30

    CPC classification number: G06F16/2456

    Abstract: Methods, program products, and systems for filtering a distributed join are described. A computing device can receive a database join request to join a first table stored on a first system and a second table stored on a second system to create a related data set. The join request can include a filtering condition for filtering the related data set. The system can divide the filtering condition into a first sub-condition and a second sub-condition, and send the first sub-condition and a second sub-condition to the first system and second system, respectively. The first system and second system can then perform filtering locally, and send filtered intermediate result to the computing device.

    Abstract translation: 描述了用于过滤分布式连接的方法，程序产品和系统。 计算设备可以接收数据库连接请求以加入存储在第一系统上的第一表和存储在第二系统上的第二表以创建相关数据集。 加入请求可以包括用于过滤相关数据集的过滤条件。 该系统可以将过滤条件划分为第一子条件和第二子条件，并将第一子条件和第二子条件分别发送到第一系统和第二系统。 然后，第一系统和第二系统可以在本地执行过滤，并将过滤的中间结果发送到计算设备。

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