Radio receiver or transmitter and method for reducing an IQ gain imbalance
US8085863B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 10, 2007 |
| Grant date | Dec 27, 2011 |
| Priority date | — |
| Expiry date | Oct 25, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/3863
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A radio receiver includes an in-phase channel and a quadrature channel, the channels being provided in parallel at a respective input with quadrature modulated radio frequency signals; and an error correction loop for detecting and correcting an imbalance in gain between at least part of the in-phase channel and a corresponding part of the quadrature channel, wherein the error correction loop comprises: a detector adapted to calculate Error_detnew=|I′|−|Q′|, where I′ and Q′ are the in-phase and quadrature channels respectively; a loop filter arranged to receive Error_detnew from the detector and calculate loop_filter_outnew+=Ki * Error_detnew, where Ki is the loop filter constant and loop_filter_outnew has an initial value of 1; and a multiplier arranged to receive loop_filter_outnew from the loop filter and adjust the signal of the quadrature channel by multiplying the signal by loop_filter_outnew.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.