The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 27, 2011
Filed:
Jul. 10, 2007
Chandra Gupta, Bochum, DE;
Chandra Gupta, Bochum, DE;
Nokia Corporation, Espoo, FI;
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_det=|I'|−|Q′|, where I′ and Q′ are the in-phase and quadrature channels respectively; a loop filter arranged to receive Error_detfrom the detector and calculate loop_filter_out+=K* Error_det, where Kis the loop filter constant and loop_filter_outhas an initial value of 1; and a multiplier arranged to receive loop_filter_outfrom the loop filter and adjust the signal of the quadrature channel by multiplying the signal by loop_filter_out.