Quadrature signal imbalance estimation
US10601630B1 · kind B1 · utility
Inventors
Key dates
| Filing date | Jun 10, 2019 |
| Grant date | Mar 24, 2020 |
| Priority date | — |
| Expiry date | Jun 10, 2039 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2027/0038
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Devices and methods for estimation of quadrature signal imbalance are provided. A quadrature signal is coupled to a computing system. The computing system determines several points on a symmetry function of corrected quadrature signals, and identifies a symmetry point that may satisfy a threshold level. An imbalance corresponding to the identified symmetry point may be used as an imbalance estimate. The imbalance estimate can be used for imbalance correction. Multiple imbalance estimates can be combined to reduce random errors caused by noise. Triangulation can be used to identify a value of symmetry that satisfies a threshold level. Triangulation allows the determination of the location of a symmetry trough by calculating as few as four symmetry points, thereby permitting embodiments to track rapidly changing imbalance. The disclosed embodiments may be employed in optical velocimetry systems, detection and ranging systems such as radar, sonar, and lidar, ultrasonics, and communications systems.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.