Phase-locked loop initialization via curve-fitting
US6993095B2 · kind B2 · utility
2Cited by
9References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 15, 2001 |
| Grant date | Jan 31, 2006 |
| Priority date | — |
| Expiry date | Apr 2, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2027/0067
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for accurately estimating the carrier frequency offset and the carrier phase offset of a digitally modulated signal using a signal processing algorithm to initialize the state variables of a Phase-Locked Loop (PLL) is disclosed. A sequence of phase values is estimated from a received sequence of symbols and the angular effect due to the modulation format is removed from the sequence of phase values. A curve-fit algorithm based in one embodiment on the RLS algorithm is then applied to a sequence of unwrapped phase values to estimate the carrier frequency offset and the carrier phase offset.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.