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    Method and apparatus for symbol timing tracking
    16.
    发明专利
    Method and apparatus for symbol timing tracking 未知

    公开(公告)号：GB2312815A

    公开(公告)日：1997-11-05

    申请号：GB9713517

    申请日：1996-01-29

    Applicant: MOTOROLA INC

    Inventor： GURNEY DAVID PAUL ,  KELTON JAMES ROBERT

    IPC: H04L1/00 ,  H04L1/20 ,  H04L7/033 ,  H04L27/233 ,  H04L7/02 ,  H04B17/00 ,  H04L27/22

    Abstract: An apparatus and method for symbol timing tracking has a decimation index input (42). The decimation index (42) is connected to an upper threshold limiter (44) and a lower threshold limiter (46). The upper threshold limiter (44) is connected to an upper shift register (48). A plurality of cells (52) in the upper shift register (48) are connected to a majority vote logic circuit (54). The majority vote logic circuit (54) is connected to a symbol clock time base (56) and a clocking and clearing control circuit (62). The clocking and clearing control circuit (62) has a clock enable output and a clear signal connected to the upper shift register (48). The lower threshold limiter (46) is connected to a lower shift register (58) that is connected to a second majority vote logic circuit (60).

    MULTICARRIER REVERSE LINK TIMING SYNCHRONIZATION SYSTEM, DEVICE AND METHOD
    18.
    发明公开
    MULTICARRIER REVERSE LINK TIMING SYNCHRONIZATION SYSTEM, DEVICE AND METHOD 失效
    设备，方法和系统对于多载波RUCK通道时间同步

    公开(公告)号：EP0840964A4

    公开(公告)日：2002-02-13

    申请号：EP97920360

    申请日：1997-04-11

    Applicant: MOTOROLA INC

    Inventor： BAUM KEVIN ,  KELTON JAMES ROBERT ,  RASKY PHILLIP DAVID

    IPC: H04J3/06 ,  H04L27/26

    CPC classification number: H04W56/0005 ,  H04J3/0682

    Abstract: The present invention provides a communication system (100), device (200), and method of reverse link symbol timing synchronization of transmitted signals to facilitate reverse link timing synchronization. A base unit (204) transmits a forward link signal (160) and determines a timing offset for signals received on a reverse link synchronization channel (150). A plurality of multicarrier subscriber units (202) receive a forward link signal (160) and transmits a reverse link symbol timing synchronization burst on a reverse link channel (160).

    MULTIPLE USER COMMUNICATION SYSTEM, DEVICE AND METHOD WITH OVERLAPPING UPLINK CARRIER SPECTRA
    20.
    发明公开
    MULTIPLE USER COMMUNICATION SYSTEM, DEVICE AND METHOD WITH OVERLAPPING UPLINK CARRIER SPECTRA 失效
    多用户通信系统和方法与装置重叠AUFWÄRTSTRÄGERSPEKTRA

    公开(公告)号：EP0861529A4

    公开(公告)日：2000-03-08

    申请号：EP97921159

    申请日：1997-04-11

    Applicant: MOTOROLA INC

    Inventor： BAUM KEVIN ,  NADGAUDA NIKHIL S ,  PETERSON ROGER LAURIN ,  KELTON JAMES ROBERT

    IPC: H04B1/10 ,  H04B7/005 ,  H04L5/02 ,  H04L5/14 ,  H04B1/40 ,  H04L27/26

    CPC classification number: H04W52/146 ,  H04B1/1027 ,  H04L5/023 ,  H04L5/143

    Abstract: The present invention provides a system for a method, system (300), subscriber unit (320, 330), and base/headend unit (310) for a bandwidth efficient multiple user digital communication system (300) that facilitates multiple user reverse link communication using overlapped transmit signal spectra of at least two overlap bandwidth subscriber units (320, 330). Overlap bandwidth subscriber units (320, 330) receive a forward link signal, each deriving a frequency reference from the forward link signal and a symbol timing reference from the forward link signal, and transmitting a reverse link signal to the base/headend unit (310) that receives a composite reverse link signal of the reverse link signals. Each reverse link signal includes at least one modulated data carrier with distinct carrier frequencies. Each transmitted reverse link signal has a symbol timing responsive to the symbol timing reference, and the frequency spectra of the reverse link signals overlap using overlapped transmit signal spectra of at least two overlap bandwidth subscriber units (320, 330).

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