Baseband encoding method and apparatus for increasing the transmission rate over a communication medium
US5856980A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 8, 1994 |
| Grant date | Jan 5, 1999 |
| Priority date | — |
| Expiry date | Dec 8, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L25/4919
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An encoder for encoding binary data bits supplied by a data source into pulse amplitude modulated multilevel symbols. The encoder includes a bit stuffer for receiving the data bits from the data source at a first data bit rate, which at most equals a maximum data bit rate. The bit stuffer then adds descriptive bits to the data bits at a descriptive bit rate, which at most equals a maximum descriptive bit rate. The encoder also includes a multilevel pulse amplitude modulator for receiving the data and descriptive bits from the bit stuffer and for converting the data and descriptive bits into pulse amplitude modulated multilevel symbols. When these multilevel PAM symbols are transmitted, they have a spectral energy characteristic which is below a predetermined low level threshold at a predetermined baseband bandwidth frequency. In addition, these multilevel PAM symbols have a symbol rate (i.e., baud rate) which at most equals a maximum baud rate when the first data bit rate equals the maximum data bit rate and the descriptive bit rate equals the maximum descriptive bit rate. In turn, the magnitude of the maximum baud rate equals the magnitude of the baseband bandwidth frequency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.