Timing estimator in OQPSK demodulator
US7792216B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 12, 2006 |
| Grant date | Sep 7, 2010 |
| Priority date | — |
| Expiry date | May 18, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/2331
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A timing estimator of an OQPSK demodulator is provided. In the timing estimator, an A/D converter converts an analog reception signal into a digital reception signal. A differential circuit section delays the digital reception signal from the A/D converter by a preset time and obtains a phase difference between a conjugate complex number signal of the delayed digital reception signal and the digital reception signal to offset a frequency error contained in the digital reception signal. A correlation operation section performs a correlation operation between a reference symbol differentiated in the same way as a differentiation of the differential circuit section and the reception signal to obtain each correlation value. A coherent detector detects a coherent point on the basis of the correlation value from the correlation operation section.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.