Compensator unit and compensation method for I/Q imbalance errors
US8406344B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 29, 2010 |
| Grant date | Mar 26, 2013 |
| Priority date | — |
| Expiry date | May 24, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03D3/009
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A compensator unit compensates frequency-dependent imbalance between a sampled in-phase and a sampled quadrature phase signal. The compensator unit includes a delay channel (381) and a filter channel (382). The delay channel (381) delays an intermediate signal x(t), which is obtained by superposition of the sampled in-phase and quadrature phase signals, by an integer multiple greater than zero. The filter channel (382) includes a filter (320) with a complex conjugated block (321) and with variable filter coefficients determined on base of autocorrelation function values of the intermediate signal x(t). The filter coefficients are determined such that the complementary autocorrelation of a compensator output signal y(t) is minimized for the filter span.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.