System and method for automatic frequency correction in a pilot symbol assisted demodulator
US6519300B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 12, 1998 |
| Grant date | Feb 11, 2003 |
| Priority date | — |
| Expiry date | Nov 12, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2027/0046
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A method for selecting a frequency offset for automatic frequency correction in a pilot symbol assisted demodulation system comprises the steps of receiving a signal comprising a plurality of symbols having discrete possible values, and pilot symbols at predetermined locations in the signal having a predetermined value. The method further includes selecting a set of postulates defining a range of frequency offsets, multiplying the pilot symbols and selected ones of the plurality of the symbols by a sinusoid of the postulates to compensate for the postulated error, and estimating the channel at the error-compensated pilot symbols. The estimated channel at the error-compensated pilot symbols is then interpolated and a metric is generated for the error-compensated pilot and the selected symbols using the symbols' discrete possible values and the interpolated estimated channel. The postulate with a minimum accumulated metric is used in demodulating the symbols.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.