Cable modem system with sample and packet synchronization
    3.
    发明授权
    Cable modem system with sample and packet synchronization 有权
    有线调制解调器系统,带有采样和分组同步

    公开(公告)号:US06763032B1

    公开(公告)日:2004-07-13

    申请号:US09501892

    申请日:2000-02-10

    IPC分类号: H04B7212

    摘要: A method for communicating information is disclosed wherein a time slot is allocated in a time division multiple access system for a transmission from a subscriber to a headend. Synchronization of a clock of the subscriber with respect to a clock of the headend is enhanced using a message transmitted from the headend to the subscriber which is indicative of an error in a subscriber transmission time with respect to the time slot. A feedback loop process is used to determine at least one of fractional symbol timing correction and carrier phase correction of a transmission from the subscriber to the headend. Filter coefficients are generated at the headend from a ranging signal transmitted from the subscriber to the headend and transmitting the filter coefficients from the headend to the subscriber, the filter coefficients being used by the subscriber to compensate for noise in a transmission from the subscriber to the headend.

    摘要翻译: 公开了一种用于传送信息的方法,其中在用于从订户到头端的传输的时分多址系统中分配时隙。 使用从前端发送到用户的消息来增强用户相对于前端的时钟的时钟的同步,该消息指示相对于时隙的用户传输时间中的错误。 反馈回路过程用于确定从订户到头端的传输的分数符号定时校正和载波相位校正中的至少一个。 滤波器系数在头端从从用户发送到头端的测距信号产生,并且将滤波器系数从头端发送到用户,滤波器系数由用户使用以补偿从用户到用户的传输中的噪声 头端