Phase tracking loop for digital modem
US4532640A · kind A · utility
12Cited by
3References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 12, 1982 |
| Grant date | Jul 30, 1985 |
| Priority date | — |
| Expiry date | Aug 12, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/087
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A phase tracking loop is provided for a digital modem. The phase tracking loop rotates the equalized output of the modem by a phase corrector angle generated by a phase error detector, frequency offset integrator and phase corrector integrator. The phase error is obtained by complex multiplexing the coordinates of the received signal with a phase corrector number. The first integrator operates on the sum of the detected phase error. The second integrator operates on the sum of the output of the phase detector and first integrator. The second integrator output comprises the phase corrector angle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.