Quadrature receiver and method of compensating for I/Q imbalance using a calibration signal
US8649464B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 11, 2011 |
| Grant date | Feb 11, 2014 |
| Priority date | — |
| Expiry date | Apr 3, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/3863
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A quadrature demodulator receiver unit (100) comprises a first filter unit (360) that may delay an intermediate signal x(t) whose real part is based on a sampled in-phase IF signal (xi(t)) and whose imaginary part is based on a sampled quadrature IF signal (xq(t)). A second filter unit (366) filters a conjugate complex version of the intermediate signal x(t). The filter coefficients of the filter units (360, 366) are determined using a calibration signal, for example on the basis of ratios of complex-valued spectral components of intermediate signals xcal(t) obtained from the calibration signal cal(t). The filtered signal and the delayed signal are recombined to obtain a compensated output signal y(t). The calibration signal may be supplied from an oscillator circuit supplying a signal for processing a receive signal of the receiver unit (100).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.