Method and apparatus for characterizing modulation schemes in an HFC network
US7876697B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 20, 2006 |
| Grant date | Jan 25, 2011 |
| Priority date | — |
| Expiry date | Jun 18, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L1/002
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
The available modulation schemes of a network are analyzed to determine which ones contain excessive phase noise or narrowband interference. A network element is selected and assigned to a test channel at a first modulation scheme at a predetermined power level to achieve a predetermined PER. The network element transmits a test signal and the network controller measures the signal to noise ratio (SNR) in the received test signal. If the SNR is not within a predetermined tolerance range of an estimated SNR for the modulation scheme at the predetermined PER, the modulation scheme is determined to have excessive phase noise or narrowband interference. Each available modulation scheme is tested by instructing the network element to transmit the test signal using each modulation scheme and assigning the power level of each modulation scheme. The suitable modulation schemes may be determined.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.