Signal cancellation using feedforward and feedback paths
US9490963B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 4, 2014 |
| Grant date | Nov 8, 2016 |
| Priority date | — |
| Expiry date | Feb 12, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L1/0036
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A circuit that cancels a self-interference signal includes, in part, a pair of signal paths that are substantially in phase, each of which paths includes a passive coupler, a delay element and a variable attenuator. The circuit further includes, in part, a first group of P signal paths each of which is substantially in phase with the pair of paths, a second group of M signal paths each of which is substantially out-of-phase relative to the pair of signal paths, and at least a pair of feedback paths. Each of the P and M signal paths, as well as the feedback paths includes a delay element and a variable attenuator. Optionally, each of the M signal paths is optionally 180° out-of-phase relative to the pair of signal paths.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.