Updating of bit allocations in a multicarrier modulation transmission system
US5400322A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 20, 1993 |
| Grant date | Mar 21, 1995 |
| Priority date | — |
| Expiry date | Aug 20, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L1/1858
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Allocations of bits per transmission symbol to subchannels in a transmission system using multicarrier modulation are updated in response to requests from a receiver to a transmitter of the system, each request identifying a carrier whose bit allocation can be increased and a carrier whose bit allocation can be decreased, so that the total number of bits per symbol can be increased, decreased, or be unchanged. In order to synchronize bit allocation changes, a transmitted symbol counter at the transmitter and a received symbol counter at the receiver maintain synchronized symbol counts. In response to a request for a change in bit allocations, the transmitter sends a future symbol count value to the receiver, and the transmitter and the receiver implement the change when their respective counters match this count value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.