Technique to transfer multiple data streams over a wire or wireless medium
US6421393B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 15, 1998 |
| Grant date | Jul 16, 2002 |
| Priority date | — |
| Expiry date | Oct 15, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/24
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A method and system for combining multiple individual asynchronous data streams for simultaneous transmission in the analog domain via a single conductor or wireless transmission medium. In one embodiment, a carrier signal is modulated and demodulated on a half-cycle basis. Each half-cycle is amplitude modulated (i.e., multiplied) by a fixed value representative of the data to be encoded that is applied to the half-cycle at zero-crossing and is held steady for the duration of the half-cycle. In this manner, each half-cycle of a carrier signal is modulated to contain data. For purposes of redundancy or security, two or more half-cycles may be used to contain the data, but in each case, the modulation still occurs on a half-cycle basis.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.