Frame and symbol timing recovery for unbursted packetized transmissions using constant-amplitude continuous-phase frequency-modulation
US8948320B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 23, 2013 |
| Grant date | Feb 3, 2015 |
| Priority date | — |
| Expiry date | Dec 23, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W84/12
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A system and method for performing frame and symbol timing synchronization on samples of a received signal that includes a series of frames. Each frame includes a known preamble and payload data. A start-of-frame time is estimated by scanning the received signal samples for the self similarity of two successive preambles. A carrier frequency offset (CFO) is estimated by maximizing a correlation between a magnitude spectrum of the received signal and a magnitude spectrum of a known preamble model. A fine estimate for the CFO is determined by computing a phase difference between samples separated by p repetitions of the base pattern for various values of index p, and computing a slope of a least squares affine fit to the phase differences. Additional operations are performed to find an optimal symbol starting point, to perform carrier phase synchronization and to detect the start of payload data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.