Cable modem and digital compensation for switchable analog filter to assist echo cancellation in full duplex cable modem
US11133915B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 15, 2019 |
| Grant date | Sep 28, 2021 |
| Priority date | — |
| Expiry date | Oct 15, 2039 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/148
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.