Method and apparatus for clock-pulse synchronization with an offset QPSK-modulated transmission signal
US7869534B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 27, 2005 |
| Grant date | Jan 11, 2011 |
| Priority date | — |
| Expiry date | Jan 13, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L7/027
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
An approach is provided for clock-pulse synchronization between an amplitude-modulated or phase-modulated received signal and a transmitted signal by estimating the timing offset between the received signal and the transmitted signal by maximum-likelihood estimation, wherein the maximum-likelihood estimation is realized through a pre-filtering dependent upon the transmission characteristic, a subsequent nonlinear signal-processing function and an averaging filtering. The received signal is an offset quadrature-phase-modulated received signal, and the nonlinear signal-processing function maintains the alternating components in the spectrum of the pre-filtered offset quadrature-phase-modulated received signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.