Automatic frequency offset compensation method and device
US8532234B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 11, 2011 |
| Grant date | Sep 10, 2013 |
| Priority date | — |
| Expiry date | May 19, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03J7/065
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The disclosure aims to implement an automatic frequency offset compensation of the frequency between emitter and receiver equipments, in radio frequency modules, with a frequency offset that can be larger than that the receiver can allow, without time loss and extra consumption. To solve this problem, the disclosure provides an automatic frequency offset compensation device comprising a reception front end, at least a filter, an I/Q demodulator for obtaining the I (In Phase) and Q (Quadrature) parameter, an automatic frequency control AFC unit for comparison of a received frequency with the real frequency of the equipment, and a microcontroller and a frequency synthesizer. In this device, the frequency offset is calculated by the AFC unit from the information given by the I/Q demodulator. A coarse detection with wide filter can be used for the reception of the first part of the data called preamble signal, and a fine detection with narrow filter can be used for reception of the second part of the data called useful data frame. A frequency synthesis is made using the frequency offset.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.