Method of estimating the carrier frequency of a phase-modulated digital signal
US6452376B1 · kind B1 · utility
1Cited by
6References
8Claims
0Family size
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Key dates
| Filing date | Nov 17, 2000 |
| Grant date | Sep 17, 2002 |
| Priority date | — |
| Expiry date | Dec 2, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/2276
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A phase-modulated digital signal has N states representing N symbols. The carrier frequency of the signal is estimated through filtering, multiplication of the phase by N, computation of a Fourier transform of the result, and finding the frequency at which the Fourier transform is at a maximum. The frequency can be found by determining the maximum value of the square of the modulus of the Fourier transform and the value of the frequency for which the derivative is zero.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.