Home phone line networking next generation enhancements
US7327765B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 22, 2003 |
| Grant date | Feb 5, 2008 |
| Priority date | — |
| Expiry date | Feb 5, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B3/32
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
New version devices of a home phone line network may operate on a first carrier frequency (within the new version frequency band) while old version devices may operate at a second carrier frequency (within the old version frequency band). Preamble, header, and trailer portions of a new version signal include a plurality of spectral copies of a baseband modulated signal. One or more of these spectral copies of the baseband modulated signal is/are indistinguishable from corresponding components of an old version signal. The new version signal is transmit filtered to have a negatively sloping power spectral density in order to maintain a constant power level in relation to old version signals and to have slope that is opposite of binder crosstalk so as to form, with the average crosstalk, a constant level white noise floor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.