Cable modem and digital compensation for switchable analog filter to assist echo cancellation in full duplex cable modem

    公开(公告)号:US11133915B2

    公开(公告)日:2021-09-28

    申请号:US16601611

    申请日:2019-10-15

    Abstract: A cable modem supporting full duplex (FDX) operations. The cable modem includes a transmit circuitry configured to process a transmit signal and a receive circuitry configured to process a receive signal. The receive circuitry includes a switchable analog filter configured to filter the receive signal. The switchable analog filter is configurable for different passband frequencies. The receive circuitry also includes a digital compensation filter configured to compensate a difference in frequency response in a specific frequency band due to switching of the switchable analog filter for a different passband frequency. The cable modem also includes an adjacent channel interference (ACI) cancellation filter and an adjacent leakage interference (ALI) cancellation filter. A digital compensation filter is also used in processing the ACI cancellation signal and the ALI cancellation signal to impose or compensate the difference in frequency response due to the switchable analog filter switching.

    Systems and methods to facilitate downstream bandwidth utilization

    公开(公告)号:US10911253B2

    公开(公告)日:2021-02-02

    申请号:US16266601

    申请日:2019-02-04

    Abstract: A cable modem (CM) system for utilizing additional bandwidth is disclosed. The system includes a receiver path, a feedback path, and a feedback receiver. The receiver path is configured to obtain a base signal having a base bandwidth from a downstream signal. The feedback path is configured to obtain an additional signal having an additional bandwidth from the downstream signal and convert the additional signal to a feedback bandwidth. The feedback receiver of a cable modem tuner is configured to process the additional signal using the feedback bandwidth.

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