Express bit swapping in a multicarrier transmission system
US6829307B1 · kind B1 · utility
Assignees
Inventors
Key dates
| Filing date | Feb 24, 2000 |
| Grant date | Dec 7, 2004 |
| Priority date | — |
| Expiry date | Feb 24, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L5/0042
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Methods and devices for adaptively changing a parameter (such as sub-carrier bit allocation and/or gain) in a multi-carrier communication signal are described. In a method aspect, a unit that determines a need for a change sends an express change request to a second unit. The change request identifies one or more specific sub-carrier carrier to be altered and a desired value for the parameter to be changed for each identified sub-carrier. The requesting unit then monitors the communication signal it receives to determine whether the requested change has been implemented. The determination of whether the requested change has been implemented is based at least in part upon an analysis of a portion of the received communication signal that was intended to be changed. In another aspect of the invention, the change request command includes a header, a control field, at least one sub-carrier identifier, at least one desired parameter value indicator, and an error field. The header identifies the command as a change request command. The control field includes a tone count that indicates the number of tones to be altered. Each sub-carrier identifier identifies a specific sub-carrier to be …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.