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40 条记录 (耗时 0.023 秒)

    Method for synchronization of received signals
    1.
    发明授权
    Method for synchronization of received signals 有权
    接收信号同步的方法

    公开(公告)号：US07065171B1

    公开(公告)日：2006-06-20

    申请号：US09982952

    申请日：2001-10-22

    申请人： Derek S. Hilborn ,  Louis Leung ,  Hongliang Zhang

    发明人： Derek S. Hilborn ,  Louis Leung ,  Hongliang Zhang

    IPC分类号： H04L7/00

    CPC分类号： H04L27/2662 ,  H04L7/007 ,  H04L27/2605 ,  H04L27/2657 ,  H04L27/2676

    摘要： A method and apparatus provide efficient synchronization recovery at the receiver end for a digital transmission system. At the receiving end, a digital signal is received including a transmitted data portion and a guard period. A signal envelope for the received digital signal is determined, and the signal envelope is filtered to find the center of the guard period, which provides a time reference for the received digital signal. Embodiments of the present invention described herein may be used for optimal operation of a digital transmission system by efficiently recovering synchronization from a received digital signal during noisy conditions without being dependent on signal shape or requiring complicated threshold calculations.

    摘要翻译： 方法和装置在数字传输系统的接收端提供有效的同步恢复。 在接收端，接收包括发送数据部分和保护周期的数字信号。 确定接收到的数字信号的信号包络，并对信号包络进行滤波以找到保护周期的中心，为接收到的数字信号提供时间参考。 本文描述的本发明的实施例可以用于数字传输系统的最佳操作，通过在噪声条件下有效地从接收的数字信号恢复同步，而不依赖于信号形状或需要复杂的阈值计算。

    DIGITAL PHOTO FRAME HAVING A SINGLE PROCESSOR
    4.
    发明申请
    DIGITAL PHOTO FRAME HAVING A SINGLE PROCESSOR 审中-公开
    具有单处理器的数码相框

    公开(公告)号：US20110037885A1

    公开(公告)日：2011-02-17

    申请号：US12641744

    申请日：2009-12-18

    申请人： Hongliang Zhang

    发明人： Hongliang Zhang

    IPC分类号： H04N5/222 ,  H04N5/66

    CPC分类号： H04N1/00347 ,  H04N1/00204 ,  H04N2201/0049 ,  H04N2201/0081 ,  H04N2201/0089

    摘要： The present invention relates to a digital photo frame and a method for controlling a digital photo frame. The digital photo frame includes a single processor to perform a function of a built-in scanner and to convert a picture into an image data file for storage and reviewing. The method includes steps of scanning an image sample to generate an analog image data; providing a processor processing the analog image data into a digital image data and controlling a displaying unit. The present invention could achieve advantages of reducing production cost, enhancing stability, reducing steps for processing a signal and simplifying a design of a digital photo frame.

    摘要翻译： 本发明涉及数字相框和数字相框的控制方法。 该数码相框包括一个执行内置扫描仪功能的单个处理器，并将图像转换为图像数据文件进行存储和查看。 该方法包括扫描图像样本以产生模拟图像数据的步骤; 提供将模拟图像数据处理成数字图像数据并控制显示单元的处理器。 本发明可以实现降低生产成本，提高稳定性，减少处理信号的步骤和简化数码相框的设计的优点。

    Adaptive weight update method and system for a discrete multitone spread spectrum communications system
    6.
    发明授权
    Adaptive weight update method and system for a discrete multitone spread spectrum communications system 有权
    用于离散多音频扩频通信系统的自适应权重更新方法和系统

    公开(公告)号：US07339978B2

    公开(公告)日：2008-03-04

    申请号：US11222554

    申请日：2005-09-09

    申请人： Hongliang Zhang

    发明人： Hongliang Zhang

    IPC分类号： H04B1/707 ,  H04B15/00 ,  H04B1/38 ,  H04K1/00

    CPC分类号： H04L5/026 ,  H04B1/707 ,  H04B7/0848 ,  H04L1/0003 ,  H04L1/0015 ,  H04L1/203 ,  H04L5/0026 ,  H04L5/006 ,  H04L5/0064 ,  H04L25/0228 ,  H04L27/0008 ,  H04L27/2647 ,  H04L2025/03414 ,  H04L2025/03426

    摘要： A new method makes the most efficient use of the scarce spectral bandwidth in a wireless discrete multitone spread spectrum communications system by updating the spectral and/or spatial spreading weights at a rate that is determined by the measured quality of the link. Low quality links require more frequent updates of the spreading weights than do higher quality links. Spreading weights and despreading weights for a station are adaptively updated, depending on the error in received signals. If the error value is less than a threshold error value, then the method maintains the existing spreading weights as the current spreading weights to apply to an outgoing data signal. Alternately, if the error value is greater than the threshold error value, then the method adaptively calculates updated despreading weights at the base station from the first spread signal and calculates updated spreading weights as the current spreading weights from the updated despreading weights to apply to the outgoing data signal.

    摘要翻译： 一种新的方法通过以由测量的链路质量确定的速率更新频谱和/或空间扩展权重来最有效地利用无线离散多音频扩频通信系统中的稀疏频谱带宽。 低质量链接需要更频繁地更新扩展权重，而不是更高质量的链接。 根据接收到的信号中的错误，自适应地更新站点的扩展权重和解扩权重。 如果误差值小于阈值误差值，则该方法将现有扩展权重维持为当前扩展权重以应用于输出数据信号。 或者，如果误差值大于阈值误差值，则该方法从第一扩展信号自适应地计算基站处的更新的解扩权重，并根据更新的解扩权重计算更新的扩频权重，以应用于 输出数据信号。

    Frequency Band Adaptive Wireless Communication
    8.
    发明申请
    Frequency Band Adaptive Wireless Communication 有权
    频带自适应无线通信

    公开(公告)号：US20080298450A1

    公开(公告)日：2008-12-04

    申请号：US11996928

    申请日：2006-07-21

    申请人： Hongliang Zhang ,  Mark McDiarmid

    发明人： Hongliang Zhang ,  Mark McDiarmid

    IPC分类号： H04B17/00

    CPC分类号： H04W72/0453 ,  H04L1/0006 ,  H04L1/04 ,  H04L5/003 ,  H04L5/006 ,  H04W24/08 ,  H04W72/085

    摘要： A system, apparatus and method is disclosed for multiband wireless communication. Frequency bands and/or transmission formats are identified as available within a range for wireless communication. Signal quality metrics for each frequency band are evaluated by a receiver to identify qualified frequency bands. The qualified frequency bands can be ranked according to one or more signal quality metrics, where the list of qualified bands can be communicated to a transmitter. The transmitter is arranged to evaluate the list of qualified bands and select a communication method based on the available frequency bands and a selected communication optimization scenario. Multiple frequency bands and communication methods can be utilized by the transmitter such that a combination of licensed, unlicensed, semilicensed, and overlapped frequency bands can be simultaneously used for communication. The receiver continually monitors communications and can report link performance to the transmitter for adaptive control of the selected communication methods.

    摘要翻译： 公开了一种用于多频带无线通信的系统，装置和方法。 频带和/或传输格式在无线通信的范围内被识别为可用。 每个频带的信号质量度量由接收机评估以识别合格的频带。 可以根据一个或多个信号质量度量对合格的频带进行排序，其中合格频带的列表可以被传送到发射机。 发射机被设置为评估合格频带的列表，并且基于可用频带和所选择的通信优化场景选择通信方法。 多个频带和通信方法可以被发射机利用，使得许可的，非许可的，半精密的和重叠的频带的组合可以同时用于通信。 接收机连续监视通信，并可以向发射机报告链路性能，以便对所选择的通信方法进行自适应控制。

    Automatic gain control methods and apparatus suitable for use in OFDM receivers
    9.
    发明授权
    Automatic gain control methods and apparatus suitable for use in OFDM receivers 有权

    公开(公告)号：US06574292B2

    公开(公告)日：2003-06-03

    申请号：US10051714

    申请日：2002-01-17

    申请人： Jari M. Heinonen ,  Michael R. Hirano ,  Hongliang Zhang

    发明人： Jari M. Heinonen ,  Michael R. Hirano ,  Hongliang Zhang

    IPC分类号： H04L2708

    CPC分类号： H04L27/2647 ,  H03G3/001 ,  H03G3/3089

    摘要： Automatic gain control (AGC) methods and apparatus suitable for use in orthogonal frequency division multiplexing (OFDM) receivers are described. One AGC method includes the steps of repeatedly performing a first AGC process which adjusts amplifier gain based on determining that a signal level of multiple time sample values is outside a limit set by a first predefined threshold; and repeatedly performing a second AGC process which adjusts the amplifier gain based on determining that a signal level of multiple frequency sample values associated with a plurality of pilot tones is outside a limit set by a second predefined threshold. Preferably, the first AGC process is performed repeatedly at a first rate and the second AGC process is performed repeatedly at a second rate that is less than the first rate.

    Adaptive weight update method and system for a discrete multitone spread spectrum communications system
    10.
    发明授权
    Adaptive weight update method and system for a discrete multitone spread spectrum communications system 有权
    用于离散多音频扩频通信系统的自适应权重更新方法和系统

    公开(公告)号：US06408016B1

    公开(公告)日：2002-06-18

    申请号：US09699361

    申请日：2000-10-31

    申请人： Hongliang Zhang

    发明人： Hongliang Zhang

    IPC分类号： H04B1500

    CPC分类号： H04L5/026 ,  H04B1/707 ,  H04B7/0848 ,  H04L1/0003 ,  H04L1/0015 ,  H04L1/203 ,  H04L5/0026 ,  H04L5/006 ,  H04L5/0064 ,  H04L25/0228 ,  H04L27/0008 ,  H04L27/2647 ,  H04L2025/03414 ,  H04L2025/03426

    摘要： A new method makes the most efficient use of the scarce spectral bandwidth in a wireless discrete multitone spread spectrum communications system by updating the spectral and/or spatial spreading weights at a rate that is determined by the measured quality of the link. Low quality links require more frequent updates of the spreading weights than do higher quality links. Spreading weights and despreading weights for a station are adaptively updated, depending on the error in received signals. If the error value is less than a threshold error value, then the method maintains the existing spreading weights as the current spreading weights to apply to an outgoing data signal. Alternately, if the error value is greater than the threshold error value, then the method adaptively calculates updated despreading weights at the base station from the first spread signal and calculates updated spreading weights as the current spreading weights from the updated despreading weights to apply to the outgoing data signal.

    摘要翻译： 一种新的方法通过以由测量的链路质量确定的速率更新频谱和/或空间扩展权重来最有效地利用无线离散多音频扩频通信系统中的稀疏频谱带宽。 低质量链接需要更频繁地更新扩展权重，而不是更高质量的链接。 根据接收到的信号中的错误，自适应地更新站点的扩展权重和解扩权重。 如果误差值小于阈值误差值，则该方法将现有扩展权重维持为当前扩展权重以应用于输出数据信号。 或者，如果误差值大于阈值误差值，则该方法从第一扩展信号自适应地计算基站处的更新的解扩权重，并根据更新的解扩权重计算更新的扩频权重，以应用于 输出数据信号。