Communication unit and method for determining and/or compensating for frequency dependent quadrature mismatch
US9231839B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 7, 2014 |
| Grant date | Jan 5, 2016 |
| Priority date | — |
| Expiry date | Jul 7, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/2646
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A communication unit includes: a quadrature transmitter having analog transmit filter(s) for filtering a first quadrature test signal. An analog feedback loopback path selectively first routes the filtered quadrature first test signal to a quadrature receiver. The quadrature receiver has: at least one analog receive filter for further filtering the filtered quadrature first test signal; and a quadrature receive baseband circuit arranged to receive and decode the further filtered quadrature first test signal. The quadrature transmitter is arranged to receive a second quadrature test signal and the analog feedback loopback path selectively routes a filtered quadrature second test signal to the quadrature receiver via a second route such that the quadrature receive baseband circuit is arranged to determine a frequency-dependent quadrature imbalance of at least one component in the transmitter/receiver based on the decoded further filtered first quadrature test signal and the decoded further filtered second quadrature test signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.