Offset local oscillator frequency
US6725024B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 7, 2000 |
| Grant date | Apr 20, 2004 |
| Priority date | — |
| Expiry date | Apr 19, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L25/062
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for offsetting the frequency of a local oscillator in a receiver are disclosed. The local oscillator frequency is offset with an offset frequency that depends on the training sequence used. Training symbols are inputted to the control unit. The control unit then provides an offset frequency depending on the training symbol received. A rotation of the baseband signal, proportional to the offset frequency, is introduced which later is digitally compensated for. Upon reception of the signal, a DC offset is introduced in the radio part. The digital compensation transforms this DC offset, in the baseband signal, to a rotating signal. The rotating DC offset signal is then subtracted in the baseband processing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.