Methods and apparatus for wideband imbalance compensation
US9184975B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 20, 2014 |
| Grant date | Nov 10, 2015 |
| Priority date | — |
| Expiry date | Nov 20, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/3863
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
An imbalance compensation system includes a receiver, a first path and a second path electrically coupled to the receiver, and a 90 degree hybrid coupler electrically connected to the second path, wherein the first path is configured to convey an in-phase (I) signal and the second path is configured to convey a quadrature phase (Q) signal. A processor is configured to perform Finite Impulse Response (FIR) filtering upon the I signal and the Q signal, wherein the processor is configured with an inverse matrix of coefficients corresponding to a frequency-dependent phase imbalance and a frequency-dependent amplitude imbalance between the I signal and the Q signal. The processor is configured to perform FIR filtering to attenuate an image signal down to a system noise floor when the processor simultaneously receives signals in a primary Nyquist region and a conjugate Nyquist region.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.