Method for measuring frequency shift in digital communications using synchronization sequence and channel step response
US5995572A · kind A · utility
11Cited by
1References
9Claims
0Family size
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Key dates
| Filing date | Feb 19, 1997 |
| Grant date | Nov 30, 1999 |
| Priority date | — |
| Expiry date | Feb 19, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L7/042
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
In a process for demodulation of a received signal that contains, in addition to data to be transmitted, a preset synchronization sequence, the following is done to estimate a frequency shift. At least two nonoverlapping partial sequences of the synchronization sequence are picked off. Using a least-square process, the coefficients of the channel step response at each observation window are determined. The frequency shift, in the form of a phase rotation per symbol, is then estimated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.