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    METHOD AND APPARATUS FOR COMMUNICATING WITH ROOT-NYQUIST, SELF-TRANSFORM PULSE SHAPES
    1.
    发明公开
    METHOD AND APPARATUS FOR COMMUNICATING WITH ROOT-NYQUIST, SELF-TRANSFORM PULSE SHAPES 有权
    方法和设备带根NYQUIST自变换的脉冲形状上通信

    公开(公告)号：EP2162985A4

    公开(公告)日：2014-07-02

    申请号：EP08756224

    申请日：2008-05-23

    申请人： ERICSSON TELEFON AB L M

    发明人： DENT PAUL WILKINSON

    IPC分类号： H04L25/03 ,  H04L27/26

    CPC分类号： H04L25/03834 ,  H04L25/03821 ,  H04L25/0384 ,  H04L25/03859 ,  H04L27/2626 ,  H04L27/2647

    摘要： A communication system (20) comprises a transmitter (22) and a receiver (24). The transmitter (22) comprises a source of information symbols (30); a pulse shaping wave function generator (32); and a combiner (34) configured to express the information symbols received from the source as signals which are shaped in time and frequency domains by the wave function. The pulse shaping wave function generator (32) is configured to provide a wave function which has the Nyquist property and has a same shape as its own Fourier transform. The combiner (34) is configured to combine the wave function with a stream of digital data symbols to produce a filtered stream for transmission by the transmitter.

    Quadrature modulation circuit
    7.
    发明公开
    Quadrature modulation circuit 失效
    Quadraturmodulationsschaltung

    公开(公告)号：EP0776110A3

    公开(公告)日：1997-07-30

    申请号：EP97100128.4

    申请日：1992-01-13

    申请人： MITSUBISHI DENKI KABUSHIKI KAISHA

    发明人： Iwane, Yasushi, c/o Mitsubishi Denki K.K.

    IPC分类号： H04L27/20 ,  H04L25/03

    CPC分类号： H04L27/2017 ,  H04L25/03859

    摘要： A ROM low pass filter as well as a quadrature modulation circuit using the low pass filter are provided. The low pass filter comprises a first shift register (211) for receiving a first half (n/2) of the input signal data (101) and a second shift register (212) for receiving a second half (n/2) of the input data. A selector (1001) is adapted to selectively supply either the first half signal or the second half signal in time reverse to a ROM (2011) depending on the value of a selection signal (S 0 ). The quadrature modulation circuit comprises at least one such low pass filter for limiting the frequency band width of the in-phase channel (I) and the quadrature channel (Q).

    摘要翻译： 正交调制电路包括通过对同相信道（I）和正交相位信道（Q）的时分处理进行操作的低通滤波器（20），并且使用波的幅度对称性来减少地址要求数据 在时间轴上形成和/或使用对称波形。 ROM（201）的容量减少了一半以上，并且正交调制电路的配置被简化。