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:
Apr. 24, 2007
Filed:
Jul. 12, 2004
Young-wan Kim, Daejon, KR;
Chang-seok Lee, Daejon, KR;
Yu-shin Kim, Daejon, KR;
Hee-jin Yoo, Chungcheongnam-do, KR;
Eun-suk Kwak, Daejon, KR;
Young-Wan Kim, Daejon, KR;
Chang-Seok Lee, Daejon, KR;
Yu-Shin Kim, Daejon, KR;
Hee-Jin Yoo, Chungcheongnam-do, KR;
Eun-Suk Kwak, Daejon, KR;
Abstract
An apparatus and a method for detecting imbalances between an I-channel signal and a Q-channel signal in order to suppress a spurious signal in a direct conversion digital quadrature transmission system is disclosed. The apparatus includes: a compensation signal generating unit for generating a first and a second compensation signals based on a digital I-channel and a digital Q-channel signals; a baseband signal generating unit for generating an I-channel and a Q-channel baseband signals by converting a radio frequency signal into a low frequency signal; and a detecting unit for detecting a phase imbalance and an amplitude imbalance between the digital I-channel and the digital Q-channel signals by using a correlation between the first and the second compensation signals with the I-channel and the Q-channel baseband signals.