Estimating frequency shift
US8149962B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 16, 2009 |
| Grant date | Apr 3, 2012 |
| Priority date | — |
| Expiry date | Sep 10, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/266
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Techniques, systems and apparatus are described for estimating a frequency shift. An apparatus for estimating a frequency shift includes a fast Fourier transform unit to transform a signal of a time domain into a frequency domain and output fast Fourier transform symbols. A complex conjugate multiplier is in communication with the fast Fourier transform unit and output a continual pilot correlation between every two of the fast Fourier transform symbols output from the fast Fourier transform unit. A correlation memory unit is in communication with the complex conjugate multiplier to store the continual pilot correlation output from the complex conjugate multiplier. An adder is in communication with the correlation memory unit to add the continual pilot correlations stored in the correlation memory unit and generate an output signal comprising estimated values of the frequency shift.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.