Phase difference based frequency correction channel detector for wireless communication system
US7110478B2 · kind B2 · utility
2Cited by
10References
20Claims
0Family size
Assignee
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Key dates
| Filing date | Apr 9, 2002 |
| Grant date | Sep 19, 2006 |
| Priority date | — |
| Expiry date | Aug 17, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04Q1/45
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A method of detecting a tone signal from complex input samples r(n) in a wireless communication system is disclosed. The method comprises calculating the phase difference of the samples r(n) as a signal x(n). Next, the signal x(n) is filtered with a notch filter to generate a notched output y(n). The power of both the signal x(n) and the notched output y(n) is estimated. The ratio of the powers of the notched output y(n) and signal x(n) is calculated. The tone signal is detected if the ratio is below a predetermined threshold for a predetermined duration of time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.