Broadband network for coaxial cable using multi-carrier modulation
US7573822B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 12, 2007 |
| Grant date | Aug 11, 2009 |
| Priority date | — |
| Expiry date | Feb 6, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/0006
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A broadband local area data network uses coaxial cable wiring for interconnection of terminal devices. Orthogonal frequency division multiplexing (OFDM) with bit loading is used to overcome channel impairments and provide a path for terminal devices to transmit to and receive from other terminal devices. Probe messages are sent between devices to characterize the communication channel and determine optimum bit loading. The data network shares the cable spectrum with other services and uses frequency bands not used by other services. Adaptive power control can be used to maintain signal to noise ratio in a communication between terminal devices. Frequency coordination can be used to avoid interference between the LAN communications and other services transmitted on the cable.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.