Superframes
US5119403A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 26, 1991 |
| Grant date | Jun 2, 1992 |
| Priority date | — |
| Expiry date | Jul 26, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/3472
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
The present invention is directed toward a method and apparatus in a communications device for mapping a selected group of data bits into a predetermined number of two-dimensional symbols selected from a minimized alphabet of M two-dimensional symbols forming a symbol constellation, with one of the two-dimensional symbols being transmitter during each symbol (i.e., baud) interval. A plurality of symbol mappers in an adaptive communications device use a superframe of bits per baud. Each superframe includes at least two groups of frames, a low bit frame and a high bit frame. The superframe has A) one of these two types of frames uses whole bits per baud and the other uses fractional bits per baud or B) both of these two types of frames will use fractional bits per baud.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.