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    Spread spectrum digital transmission system using low-frequency pseudorandom encoding of the wanted information and spectrum spreading and compression method used in a system of this kind
    1.
    发明授权
    Spread spectrum digital transmission system using low-frequency pseudorandom encoding of the wanted information and spectrum spreading and compression method used in a system of this kind 失效
    使用这种系统中使用的有用信息和频谱扩展和压缩方法的低频伪随机编码的扩频数字传输系统

    公开(公告)号：US5546423A

    公开(公告)日：1996-08-13

    申请号：US257057

    申请日：1994-06-08

    申请人： Philippe Sehier ,  Dominique Deprey

    发明人： Philippe Sehier ,  Dominique Deprey

    IPC分类号： H04K1/02 ,  H04B15/00

    CPC分类号： H04K1/02

    摘要： A spread spectrum digital transmission system using low-frequency pseudorandom encoding of desired information, and a spectrum spreading and compression method used in such a system. In a transmitter in the system, each block of a digital signal to be transmitted is combined with a sample obtained from a low-frequency pseudorandom generator. The resulting various combinations are converted into orthogonal or quasi-orthogonal sequences which are modulated and transmitted to a receiver. The receiver demodulates the signal received and combines each sequence with a sample identical to that used for the low-frequency coding at the transmitter to recover the various blocks of the transmitted signal. Hence, low frequency spectrum spreading of a signal to be transmitted is achieved.

    摘要翻译： 使用期望信息的低频伪随机编码的扩频数字传输系统以及在这种系统中使用的频谱扩展和压缩方法。 在系统中的发射机中，要发送的数字信号的每个块与从低频伪随机发生器获得的样本组合。 所得到的各种组合被转换成正交或准正交序列，其被调制并传输到接收机。 接收机解调所接收的信号，并将每个序列与在发射机处用于低频编码的样本相同的样本进行组合，以恢复发射信号的各个块。 因此，实现要发送的信号的低频扩频。