Time shift keying digital communications system
US5406584A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 1, 1992 |
| Grant date | Apr 11, 1995 |
| Priority date | — |
| Expiry date | Sep 1, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/2025
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A digital modulation technique is disclosed which is unique in that it does not utilize fixed time slots for varying the characteristics of an electromagnetic carrier signal, but actually uses variations of the time slots to transfer the digital information. The modulation is created by using direct digital synthesis techniques to produce a carrier waveform that closely approximates a sine wave carrier signal that can vary the time it takes for each peak to occur. The peaks of the carrier are tightly controlled to occur at exact discrete time slots that correspond to certain base band digital data. The time slot changes occur precisely at the sine wave peaks to minimize the bandwidth requirement and maximize the data rate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.