Carrier reproduction circuit
US6700940B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 15, 2000 |
| Grant date | Mar 2, 2004 |
| Priority date | — |
| Expiry date | Aug 15, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/2273
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A carrier reproduction circuit which can perform stable carrier reproduction even when reception takes place with low C/N values is provided. The reception phase of the demodulated known-pattern reception signal is detected with a frame synchronizing timing circuit (4), and based on the detected reception phase, either the phase difference table of absolute phase having one convergence point or the phase difference table of the phase rotated from the absolute phase by 180°, which are included in a carrier reproduction phase difference detecting circuit (8), is selected, and from the selected phase difference table the output based on the phase difference between the phase obtained from the signal point position of the reception signal and the phase convergence point is obtained, and thus carrier reproduction is implemented by undergoing the reproduced carrier frequency control via an AFC circuit (10) so that the phase obtained from the signal point position coincides with the phase convergence point.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.