Adaptive allocation for variable bandwidth multicarrier communication
US6798735B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 20, 1999 |
| Grant date | Sep 28, 2004 |
| Priority date | — |
| Expiry date | Oct 20, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W72/04
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Data is distributed among the channels of an asymmetric data subscriber loop (ADSL) communications system in accordance with an adaptive algorithm which from time to time measures the signal to noise ratio of the various channels and finds a margin for each channel dependent on achievement (where possible) of a given bit error rate and a desired data transmission rate. The margin distribution is achieved by augmenting the constellation signal to noise ratio to enhance computational efficiency and allow redetermination of bit allocation tables during transmission as necessary. Pairs of bit allocation tables are maintained at the transmitter and receiver and one table of each pair at the transmitter and receiver is updated while the other pair is in use for controlling communication.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.