Frequency synchronization apparatus and method in OFDM system
US8275059B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Jun 3, 2009 |
| Grant date | Sep 25, 2012 |
| Priority date | — |
| Expiry date | Jul 24, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/2688
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A frequency synchronization apparatus includes: a correlating unit that obtains a first correlation value by correlating a known reference guard interval of an OFDM symbol and a reference copy interval corresponding to the reference guard interval, and obtains a second correlation value by correlating the estimate guard interval and an estimate copy interval corresponding to the estimate guard interval; a determining unit that compares the first and second correlation values to determine a first case where the first correlation value is larger by a pre-set magnification than the second correlation value, a second case where the second correlation value is larger by a pre-set magnification than the first correlation value, and a third case which is not the first case nor the second case; and a frequency offset estimating unit that estimates a frequency offset by using a correlation value corresponding to any one of the first to third.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.