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153 条记录 (耗时 0.01 秒)

    TRI-STATE INTEGER CYCLE MODULATION
    23.
    发明公开
    TRI-STATE INTEGER CYCLE MODULATION 有权
    三态调制结合整周

    公开(公告)号：EP1649656A2

    公开(公告)日：2006-04-26

    申请号：EP04777021.9

    申请日：2004-06-24

    申请人： XG TECHNOLOGY, LLC

    发明人： BOBIER, Joseph

    IPC分类号： H04L27/28

    CPC分类号： H04L27/10 ,  H04L27/0004

    摘要： The invention disclosed in this application uses a method of modulation named Tri-State Integer Cycle Modulation (TICM) wherein a carrier signal, comprised of a continuum of sine waves is modulated such that spectrum utilization is minimal. A modulation event is imposed upon the carrier signal by modifying the carrier frequency at precisely the zero crossing point or the zero degree angle. The method of imposing the modulation event is by increasing the frequency of the carrier for one or an integer number of wavelets then lowering the frequency of the carrier for one or the same integer number of wavelets then returning to the carrier frequncy to derive the modulation event. The main carrier frequency is only modulated beginning at the zero degree phase angle and ending at the 360-degree phase angle.

    OFDM COMMUNICATION DEVICE
    24.
    发明公开
    OFDM COMMUNICATION DEVICE 有权
    OFDM通信装置

    公开(公告)号：EP1597887A2

    公开(公告)日：2005-11-23

    申请号：EP04707023.0

    申请日：2004-01-30

    申请人： MOTOROLA, INC.

    发明人： AKITA, Hidenori ,  IKEDA, Tetsu

    IPC分类号： H04L27/28 ,  H04K1/10

    CPC分类号： H04L27/2663 ,  H04L27/2613

    摘要： To provide high-quality communication even when the power for synchronization preamble is reduced in an OFDM communication system, an OFDM communication transmitter obtains a zero amplitude reduced preamble signal by passing a specified synchronization preamble through an ideal low-pass filter (10) to reduce a signal component near zero amplitude within a time domain, and time-multiplexes (11) the obtained zero amplitude reduced preamble signal with transmit data to generate an OFDM transmit signal. A receiver section (20) of the OFDM communication system determines the cross correlation (19) between a receive signal and a specified synchronization preamble (17), which is patterned the same as the counterpart in a transmitter section of the OFDM communication system, and detects a synchronization position in accordance with the determined cross correlation.

    BURST-MODE COMBINING OF REVERSE PATH RADIO FREQUENCY SIGNALS
    25.
    发明公开
    BURST-MODE COMBINING OF REVERSE PATH RADIO FREQUENCY SIGNALS 有权
    COMBINING在突发模式反向通道射频信号

    公开(公告)号：EP1502360A1

    公开(公告)日：2005-02-02

    申请号：EP03724318.5

    申请日：2003-04-28

    申请人： Scientific-Atlanta, Inc.

    发明人： SORENSON, Donald C.

    IPC分类号： H04B1/00 ,  H04B15/00 ,  H04K1/10 ,  H04L27/28 ,  H04N7/173

    CPC分类号： H04L12/2801 ,  H04N7/17309

    摘要： The present invention is directed towards a burst-mode combiner (BMC) typically located within a headend facility for transmitting received reverse signals to a specific application device dependent upon the presence of a carrier signal. The BMC includes BMC circuits that are each coupled to reverse receivers. The BMC circuits filter the reverse signals into specific frequencies. A carrier detect circuit detects the presence of a carrier signal, and when detected, allows the delayed reverse signals to be transmitted through to the application device.

    Transmitter/receiver system
    26.
    发明公开
    Transmitter/receiver system 失效
    发射机/接收机系统

    公开(公告)号：EP0144245A3

    公开(公告)日：1987-09-30

    申请号：EP84308481

    申请日：1984-12-06

    申请人： Matsushita Electric Industrial Co., Ltd.

    发明人： Horiike, Yoshio ,  Nagaishi, Yasuo ,  Fukui, Kiyotake

    IPC分类号： H04L27/28

    CPC分类号： H04L27/26

    摘要： A transmitter/receiver system for converting digital information into a multi-frequency signal for transmission. A reference frequency signal is first transmitted, then a series of frequencies having information indicative of differneces with the reference signal are transmitted, and a receiver discriminates differences with the reference frequency signal to decode the information.

    摘要翻译： 一种用于将数字信息转换成多频信号进行传输的发射机/接收机系统。 首先发送参考频率信号，然后发送具有指示与参考信号的差异的信息的一系列频率，并且接收机识别与参考频率信号的差异以对信息进行解码。