Scalable communication system using overlaid signals and multi-carrier frequency communication
US6628673B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 29, 1999 |
| Grant date | Sep 30, 2003 |
| Priority date | — |
| Expiry date | Dec 29, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/2657
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A communication system such as an OFDM or DMT system has nodes which are allowed to transmit continuously on one or just a few of the sysiem's frequency sub-channels, while the other nodes avoid putting any signal into those sub-channels. Simple low data rate nodes are allowed to use a small number of sub-channels while more complicated nodes use the remainder, and preferably functionality is provided to ensure that adjacent sub-channels are reliably spaced apart in frequency so that they do not bleed over into one another; to ensure that signals from all nodes arrive at the base station with well-aligned symbol transitions; and to ensure that signals from the various nodes arrive at the base station with similar power levels.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.