Demodulator having rotation means for frequency offset correction
US6603820B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 28, 1999 |
| Grant date | Aug 5, 2003 |
| Priority date | — |
| Expiry date | Dec 28, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2027/0057
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A demodulator for angle modulated signals having a carrier frequency includes a demodulation channel provided with a local oscillator and with an channel output for supplying angle modulated output signals. A frequency error detector is coupled to the channel output for deriving a local oscillator frequency error signal. A frequency error corrector has two inputs and an output for providing the frequency error corrected angle modulated signals, one input whereof is coupled to the channel output, whereas its other input is coupled to the frequency error detector. The frequency error corrector is embodied as a complex plane rotator for providing complex angle modulated signals by complex plane rotation of a representation of the angle modulated signals and the local oscillator frequency error signals. Advantageously an easy implementable demodulator for Soft Decision Information demodulation schemes is provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.