Compensation of DC offset impairment in a communications receiver
US6901121B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 20, 2001 |
| Grant date | May 31, 2005 |
| Priority date | — |
| Expiry date | Apr 24, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L25/063
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A novel and useful apparatus for and method of DC offset compensation for use in a communications receiver. The invention is operative to calculate an estimate of the DC offset which is subsequently subtracted from each input sample to generate compensated samples. The training sequence portion of the uncompensated input samples is used to generate an estimate of the DC offset. The vector used in calculating the offset estimate is pre-calculated for several channel lengths and stored in memory. An estimate of the channel is generated which provides the channel length and the location in the input sample buffer of the first training sequence sample to be used in calculating the offset estimate. The channel length is used to determine the number of training sequence samples to be used and to select one of the previously calculated vectors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.