Chopping correlator for a MSK data signal
US3992617A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 1, 1975 |
| Grant date | Nov 16, 1976 |
| Priority date | — |
| Expiry date | Oct 1, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/2278
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
The MSK signal is distributed to eight choppers, each of which also has coupled thereto a different sum or difference cosine or sum or difference sine chopping signal. The output signals from the choppers are summed in selected pairs in summers whose output signals are integrated over a predetermined number of unit time intervals. Coupled between four of the summers and four of the associated integrators there is an integrated time selector which enables adjusting the integrator output for different baud rates of the MSK signal input. The output signals of the integrators are coupled in pairs of multiplexers whose output signals in turn are coupled to sample and hold circuits. The output signals of the sample and hold circuits are coupled to another multiplexer whose output signal is coupled to an analog-to-digital converter to provide the data carried by the MSK signal in digital form. The correlator will provide an output from the analog-to-digital converter at a steady rate of two correlation coefficient values per unit interval for a given baud rate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.