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:
Jun. 22, 2010
Filed:
May. 17, 2005
Tony Fonden, Spanga, SE;
Mats Klingberg, Enskede, SE;
Tony Fonden, Spanga, SE;
Mats Klingberg, Enskede, SE;
Telefonaktiebolaget L M Ericsson (publ), Stockholm, SE;
Abstract
A radio transmitter with IQ-modulator error compensation includes a homodyne observation receiver () producing a first real baseband (S) signal from a real radio frequency signal (S). A real-value extracting element () and a down-sampler () convert a complex baseband signal (S) into a second real baseband signal. An adapter () determines parameters controlling an IQ-error compensator () by minimizing the error between the two real baseband signals. In a preferred embodiment he transmitter also includes a phase shifter () providing three different phase shifts to compensate for the fact that the homodyne observation receiver produces a real and not a complex signal.