Method and apparatus for carrier phase tracking
US6535549B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 14, 1999 |
| Grant date | Mar 18, 2003 |
| Priority date | — |
| Expiry date | Sep 14, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2027/0087
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A method and telecommunication system for tracking the carrier phase of a received signal includes the addition of a pilot signal to the data component of the signal prior to modulation and transmission. The pilot signal is specified to have a frequency equal to the inverse of twice a data symbol interval with zero crossings positioned at the midpoint of each symbol interval to avoid interference with the data. The received signal is demodulated to produce a complex data signal from which the pilot signal is detected to provide an estimate of the phase error in the complex data signal. The elimination of the phase error from the complex data signal is accomplished through a corrective phase shift that is equal and opposite to the estimated phase error. A sample timing estimate may also be obtained in a similar manner.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.