MSK digital data synchronization detector
US4020283A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 4, 1975 |
| Grant date | Apr 26, 1977 |
| Priority date | — |
| Expiry date | Nov 4, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/22
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
An input MSK digital data signal is correlated with MSK correlation waveforms to produce first and second correlation signals. These first and second correlation signals are operated on by an arithmetic unit to calculate many time and phase conditions of the MSK digital data signal at one time and to produce third, fourth and fifth correlation signals as a function of assumed bit times. These third, fourth and fifth correlation signals are operated on by a ratio calculator to produce a ratio signal proportional to the ratio of a minimum magnitude squared to a maximum magnitude squared for all carrier phase angles for each of the assumed bit times. A synchronization detected signal is produced when the value of the ratio signal is less than a given amplitude threshold.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.